Establish Residency Before December 31: The Deadline Checklist

From tomorrow through December 31 there are 94 days left in 2026, and if you are planning to change your state of residence, that number matters. It just does not matter for the reason most year-end articles imply. Hitting December 31 will do close to nothing for your 2026 tax bill. What it decides is whether 2027 is a clean year or a contested one.

Here is why. Every state that taxes income taxes you as a resident for the part of the year you were one. California puts it in a single sentence: "Part-year residents of California are taxed on all income received while a resident and only on income from California sources while a nonresident." If you have been a California resident since January and you complete a domicile change on December 20, California taxes your worldwide income for 354 days of 2026 and your California-source income for the remaining 11. That is the entire saving. It is a rounding error.

The reason to reach December 31 is the next year. A domicile change completed on December 28, 2026 gives you a full twelve-month nonresident year in 2027. The same change completed on January 15, 2027 gives you eleven and a half months of nonresidency and a part-year return, and it puts your move date on the wrong side of the calendar from anything that happens in the first two weeks of January. That is the whole prize, and it is a large one.

It is also the reason a late-December move date gets read with more suspicion than any other date on the calendar. States know exactly why people aim at December 31. So this article is organized around a distinction that most year-end checklists collapse: which of these items is actually a deadline, which is a deadline that runs from your move date rather than from the calendar, and which is not a deadline at all but a piece of evidence you are going to be asked about two years from now.

California publishes the test, and it is worth reading before you build a 94-day plan around it. FTB Publication 1031 defines domicile as "the place where you voluntarily establish yourself and family, not merely for a special or limited purpose, but with a present intention of making it your true, fixed, permanent home and principal establishment. It is the place where, whenever you are absent, you intend to return." Then it adds a line that decides a large share of contested cases: "The maintenance of a marital abode in California is a significant factor in establishing domicile in California."

On changing it, the publication is equally direct. "You can have only one domicile at a time. Once you acquire a domicile, you retain that domicile until you acquire another." And then the operative test: "A change of domicile requires all of the following: Abandonment of your prior domicile. Physically moving to and residing in the new locality. Intent to remain in the new locality permanently or indefinitely as demonstrated by your actions."

Read those three requirements as a project plan and notice something. Only one of them is a calendar event. Physically moving to and residing in the new locality is a thing that happens on a date, and it is the thing December 31 is a deadline for. Abandonment of the prior domicile is a process with no single date. And intent is not an event at all: the publication says it is demonstrated by your actions, which means it is established retroactively, by everything you do in the twelve months after the date you are trying to hit.

That is the structural reason a December 31 sprint so often fails. People treat the deadline as a paperwork deadline, complete a list of filings in the last week of December, and then live in 2027 exactly the way they lived in 2026. The filings are dated correctly. The actions contradict them.

You do not have to infer how this goes wrong. Publication 1031 contains a worked example of it, and it happens to be a California to Nevada move.

The facts, in the publication’s words: "Until September 2025, you were a resident of California. At that time, you declared yourself to be a resident of Nevada, where you have a summer home. You continue to spend six or seven months each year at your home in California, which you have retained. You spend only three to four months in Nevada and the rest of the time traveling in other states or countries. You transferred your bank accounts to Nevada. However, you continue to maintain your social club and business connections in California."

The determination: "Your declaration of residency in Nevada does not establish residency in that state. Your closest connections are to California and your absence from California is for temporary or transitory purposes. You are, therefore, a resident of California and are taxed on your income from all sources."

Notice what the taxpayer in that example did right. They declared the change. They moved the bank accounts. They had a real home in the destination state and they spent real time in it. Every one of those items appears on every year-end residency checklist you will read this quarter, and the taxpayer still lost, because they kept the California house and spent more of the year in it than in Nevada, and because the social and business ties never moved.

If you are considering moving from California to Nevada, that example is the shape of the argument you will be having. Nevada asks almost nothing of you: there is no income tax, so there is no Nevada filing to get right. The entire case is about what California can still say about your year.

The value of hitting December 31 scales with what happens in 2027, and for most people who are seriously planning a move, something specific is happening in 2027. California runs nine brackets from 1 percent to 12.3 percent, plus a 1 percent Mental Health Services Tax on taxable income over $1 million, for a top marginal rate of 13.3 percent. Capital gains get no preferential rate: a long-term gain is taxed exactly like salary. And since 2024 the wage cap on State Disability Insurance withholding is gone, so wage income also carries an uncapped 1.1 percent payroll tax on top of the income tax.

So a $3 million business sale closing in February 2027 is a $399,000 question at the 13.3 percent rate, and the answer turns on a date in December 2026. That is the arithmetic that makes the deadline worth planning around, and it is why the destination corridors that actually end the origin state’s claim on ordinary income, whether that is moving from California to Florida or moving from California to Texas, carry the numbers they do. You can run your own version of that comparison with our residency savings and exposure calculator.

New York’s version is similar in size and different in shape. Nine state brackets run from 4 percent to 10.9 percent, with the top rate reserved for taxable income above roughly $25 million, and New York City residents add a separate city tax topping out at 3.876 percent. For a New York City resident in the upper brackets, a capital gain can face a combined state and city rate approaching 14.8 percent before federal tax. Ending the city line alone is permanent and immediate, which is a large part of why moving from New York to Florida is the most trafficked corridor in the country.

Now the correction that belongs next to every one of those numbers. Winning nonresidency does not end the origin state’s claim on origin-source income. The leading California case on the point is one the taxpayer won. Stephen Bragg moved to a cattle ranch in Arizona around April 1, 1993, and the State Board of Equalization held he "was a resident of Arizona in 1993" and that he, "although a California resident at one time, left the state in 1993 for other than a temporary or transitory purpose." He then lost on sourcing. The covenant not to compete from the 1988 sale of his interest in Bragg Investment Company paid $1,333,333 a year, his community property half being $666,666.50, and the Board held that income California-source and apportioned 84.05 percent of it to California, sustaining assessments of $48,153 for 1993 and $42,658 plus a $10,664 late filing penalty for 1995.

The practical translation: December 31 buys you a clean residency year. It does not re-source income that was earned in the state you left. Equity compensation that vested against California workdays, a covenant not to compete tied to a California business, income from California real property, and deferred compensation earned there generally keep their character no matter where you are living when the money arrives.

There is a cost to aiming at the deadline, and you should know it before you aim. California is the state practitioners most consistently describe as the hardest to leave, and its residency audits concentrate on high earners whose departure date lines up with a liquidity event. A claimed move date of late December followed by a January capital gain is a classic trigger. That is not a secret pattern. It is the pattern.

What the Franchise Tax Board brings to that examination is not a questionnaire. It is cell phone geolocation and credit card transaction data, 1099s and K-1s issued to a California address after the claimed move date, DMV vehicle registration and driver’s license records, voter registration file cross-checks, declared-homestead filings in the new state cross-referenced against the California property you still own, social media posts and check-ins, utility and cable activity at the California residence, neighbor and informant tips, and in high-dollar disputes, private investigators.

The timeline is worse than the tooling. For a filed part-year or nonresident return, the Board has four years to assess. If no California return was ever filed for a year the Board believes you were a resident, there is no statute of limitations at all under Revenue and Taxation Code section 19057(a). Silent nonfilers, not honest part-year filers, are the highest-risk category. And the cost of being wrong is not only the tax: tax attorneys and CPAs who handle these cases informally cite roughly $15,000 to $75,000 or more to defend a contested residency case through the administrative process, climbing sharply if it reaches the Office of Tax Appeals.

New York is the same posture with a different clock. Its residency audits are document-intensive and commonly run 12 to 24 months, per Hodgson Russ’s published guide to the process, and the triggers are the familiar three: income that drops sharply the year you claim to have left, a day count near the line, and a New York home you kept.

None of this is an argument against a December move. It is an argument against a December move date that is not true. If you genuinely relocate on December 18, date it December 18 and document the week. If you are actually going to move in February, a December 31 date on a form is not a plan, it is the thing the audit will be about.

On January 1 your day counts go to zero. Every state that runs a day-count test runs it on the calendar year, so whatever you accumulated in 2026 is gone. That is the good news, and it is the reason a clean 2027 is worth so much.

Domicile does not reset. It carries: "Once you acquire a domicile, you retain that domicile until you acquire another." If your domicile is still California on January 1, 2027, it is California until you complete all three of the requirements above, whenever that turns out to be.

And there is a second test that a completed domicile change does not touch. New York taxes a person who is not domiciled in New York as a statutory resident on worldwide income if they both maintain a permanent place of abode in New York for substantially all of the taxable year and spend more than 183 days there, under Tax Law section 605(b)(1)(B). Both prongs are required, and exactly 183 days does not trigger it. The counting rule is the part that catches people: under 20 NYCRR 105.20, presence in New York for any part of a calendar day is a full day, including a layover, a lunch meeting, or a flight that lands after midnight. The only exceptions are narrow ones for people in the state solely for medical treatment or solely passing through to somewhere else.

So a New Yorker who perfects a Florida domicile on December 29, 2026 has done real and permanent work, and has not finished. In 2027 they are running an arithmetic test that does not care about intent at all.

The abode prong is where the year-end framing actively misleads, because the relevant deadline is not in December at all.

Since tax year 2022, the Tax Department’s Nonresident Audit Guidelines define "substantially all of the year" for the permanent place of abode prong to generally mean a period exceeding 10 months. That replaced a standard of more than 11 months that had held for decades, and it lowered the bar the state has to clear rather than raising it. The guidelines also make clear that it does not have to be the same property: separate leases can be combined, so a Brooklyn apartment through June 30 followed by a Westchester apartment from July 1 through November 30 satisfies the prong.

Work that through for a mover. If you keep your New York apartment all the way through 2027, you satisfy prong one for 2027 no matter how complete your Florida domicile is, and the only thing standing between you and worldwide New York taxation is staying at or under 183 New York days, counted so that a single afternoon is a day. If instead you surrender or sell the apartment by the end of October 2027, you have held it for 10 months of the year, the prong fails, and your day count stops mattering for statutory residency purposes entirely.

That is a genuine deadline, and it lands in the fall of 2027. It is not December 31, 2026. Treating it as though it were is how people spend the last week of December on filings and then hold the apartment for another full year without registering that they have chosen to live inside the 184-day test.

Whether the apartment counts at all is a narrower question than most people assume. Under Matter of Gaied v. New York State Tax Appeals Tribunal, merely maintaining a dwelling in New York is not enough: the taxpayer must have a residential interest in the property and actually use it as a residence rather than just hold the keys. The Appellate Division extended that in Matter of Obus in 2022, holding the Tribunal has to weigh the taxpayer’s actual subjective use of the dwelling, not only its objective characteristics. Those cases are real defenses. They are also fact-intensive, and neither of them is a reason to keep an apartment you do not need.

One item on the year-end list is a true hard wall, and it is a property tax benefit rather than an income tax one. Florida’s homestead exemption is keyed to a single date. Section 196.031(1)(a) of the Florida Statutes grants it to "A person who, on January 1, has the legal title or beneficial title in equity to real property in this state and who in good faith makes the property his or her permanent residence." Up to $25,000 of assessed value comes off for all taxing authorities, and an additional exemption of up to $25,000 applies to assessed value above $50,000 for all levies other than school district levies, with that second amount now adjusted annually for inflation.

The application, though, is not due in December. Section 196.011(1)(a) requires you to "file an application for exemption with the county property appraiser ... on or before March 1 of each year," and the consequence is spelled out: "Failure to make application, when required, on or before March 1 of any year shall constitute a waiver of the exemption privilege for that year, except as provided in subsection (8) or subsection (9)." Those subsections are narrow. Subsection (8) covers documented postal error. Subsection (9) lets a late applicant file with the appraiser and then petition the value adjustment board, in each case within 25 days of the mailing of the tax notice, on a showing of extenuating circumstances.

So the two dates are different and both matter: own and occupy as your permanent residence by January 1, 2027, then file by March 1, 2027. The January 1 date is the one that turns the last week of December into something real, because occupancy has to actually be true on that date, not scheduled.

What makes the homestead filing matter beyond the property tax is the evidence the appraiser requires: a Florida driver’s license, voter registration, and vehicle registration all showing the homestead address, plus proof you are not also claiming a residency-based tax benefit in another state. It is a sworn statement to a government body with fraud penalties attached, which is why it carries weight in a former state’s audit file. It is also why appraisers actively cross-check it against out-of-state filings and DMV and voter records, and why a homestead claim in Florida sitting alongside a New York STAR exemption is one of the most self-inflicted problems in this whole area.

Texas keys its equivalent to a different calendar. The residence homestead exemption is filed with the county appraisal district by April 30 of the tax year, with late filing generally allowed up to two years back, and it removes $140,000 of value from school district property taxes after the constitutional amendment Texas voters approved in November 2025 and the enabling Senate Bill 4, up from $100,000. It also carries a requirement that matters for residency purposes: a chief appraiser cannot grant it unless the address on the applicant’s driver’s license or state ID matches the homestead property. That is precisely the mismatch the state you left goes looking for.

Most of what people put on a December 31 list is not keyed to December 31 at all. It is keyed to the date you establish residency, which means a late-December move pushes these obligations into January and February, and that is fine.

Florida gives you 30 days from establishing residency to get a Florida driver license, and 10 days to register your vehicles and carry Florida auto insurance. Nevada gives you 30 days for the license and 45 for vehicle registration. Texas is the most forgiving on the license at 90 days, and Transportation Code section 521.029 keeps your out-of-state license valid to drive during that window, while vehicle registration is due within 30 days of bringing the vehicle in.

Two practical consequences. First, do not manufacture a December DMV appointment to make a list look complete; the deadline genuinely runs from your move date, and a January license following a late-December move is the normal, expected sequence. Second, do not let it slide for months either. Every one of these records is dated, every one is pulled in an audit, and a six-month gap between a claimed move date and the first piece of dated evidence in the new state is the kind of gap that gets characterized rather than explained.

Voter registration sits in a slightly different place, because there is usually no deadline to register at all, only a deadline to register in time to vote in a particular election. Florida takes registrations any time but requires them at least 29 days before an election to vote in it. Nevada asks for 28 days by mail and allows in-person registration up to and including Election Day. Texas requires applications at least 30 days before the election. Treat registration as a domicile fact to establish promptly rather than a race against the calendar, and note that where you actually vote, not just where you are registered, is a fact the origin state can check.

The best correction to a paperwork-first reading of this deadline is a case the taxpayer won badly out of sequence.

Gregory Blatt was general counsel at IAC and became chief executive of Match in Dallas. New York asserted he was still domiciled in New York and issued a notice of deficiency for $430,065. The administrative law judge found he proved, by clear and convincing evidence, that he changed his domicile to Texas in November 2009. His Texas driver’s license and voter registration did not arrive until April and May of 2010, five and six months after the domicile change the judge accepted. He kept his owned Manhattan apartment throughout, and a boat in the Hamptons. The deficiency was canceled. The judge wrote that his dog "was his near and dear item which reflected his ultimate change in domicile to Dallas," and expressly declined to adopt either side’s detailed day counts, because he was under 183 New York days in both years and the day counts did not decide the case.

Matter of Patrick makes the same point at a larger number. A taxpayer who claimed a change of domicile from New York City to Paris in 2011 had notices of deficiency asserting $1,681,160 in tax, $2,189,743.84 with interest and penalties, canceled, even though the Division counted 168 New York days against 82 Paris days in 2011 and 183 New York days against 92 Paris days in 2012. The judge credited testimony about his reunion with a high school girlfriend he had not seen in nearly 40 years, and whom he married, as establishing genuine intent.

The lesson is the one Publication 1031 states as doctrine: intent is demonstrated by your actions, and the filings are corroboration rather than the event itself. Which cuts both ways. If your life actually moved in December, a January license and a March homestead filing will not sink you. If your life did not move, a December 30 declaration of domicile will not save you.

One hard limit on that comfort. Both of those cases were domicile cases, and in Patrick the Division asserted domicile only and never claimed statutory residency. Statutory residency is arithmetic. It does not weigh your dog, your marriage, or your intent. If you are over the day count with an abode held long enough, you lose regardless of how genuine the move was, which is exactly why the abode and the day count deserve their own plan.

Florida is one of the few states with a purpose-built filing for this. Under section 222.17 of the Florida Statutes, a person who has established a Florida domicile may manifest and evidence it by filing, in the office of the clerk of the circuit court for the county where they reside, a sworn statement including "a declaration that the person making the same is, at the time of making such statement, a bona fide resident of the state," identifying prior residences and any current out-of-state address. Subsection (2) covers people who keep homes in more than one state: they declare that the Florida place of abode "constitutes his or her predominant and principal home." The clerk records it. The recording fee runs about $10.

Read subsection (4) before you assume the document only points one way. It lets a person who lives in Florida but is domiciled elsewhere file a declaration to "manifest and evidence his or her permanent domicile and intention to permanently maintain and continue his or her domicile" in the other state. The statute is a mechanism for documenting where your domicile is, not a mechanism for choosing it.

Nevada has a quieter equivalent in NRS 41.191: a sworn statement filed with the district court clerk of the county where you reside, declaring that your Nevada residence is your predominant and principal home and that you intend to keep it permanently. It is not mandatory, and Nevada residency and CPA firms consistently recommend it anyway for anyone whose former state may later challenge the change. Nevada’s homestead filing is worth a note for the same reason: NRS 115.010(2) protects equity in a primary residence up to $605,000, and claiming it requires recording a declaration of homestead with the county recorder. It is creditor protection rather than a tax break, so it saves you nothing directly, but it is a dated, recorded, public document, which is why former-state auditors look for it. Be careful with the figure if you go reading around: the Legislative Counsel Bureau’s own fact sheet on the exemption still prints $550,000, while the statute reads $605,000.

Texas has no equivalent filing at all. Intent there is assembled from the homestead exemption, the driver’s license, the voter registration and the vehicle registrations, which is one reason full-time travelers without a fixed Texas address commonly use a mail-forwarding domicile service to satisfy the same set of requirements.

The honest valuation of all of these: a declaration of domicile is routinely cited in other states’ residency audits as one data point supporting a genuine change, and it is not dispositive on its own. Publication 1031’s Example 3 is the proof. The taxpayer there declared Nevada residency and lost anyway. File it, because a sworn recorded statement of a true fact costs $10 and helps. Do not file it in the last week of December believing it is the thing that closes the question.

A move year almost always means your withholding was keyed to the wrong state for part of the year, and the place that surfaces is the fourth estimated tax installment.

On the federal side, the fourth 2026 installment is due January 15, 2027, and Form 1040-ES states the escape: "You don’t have to make the payment due January 15, 2027, if you file your 2026 tax return by February 1, 2027, and pay the entire balance due with your return."

California’s schedule is the one that catches people, because it is not four equal quarters. Per the Form 540-ES instructions, "Installments due shall be 30% of the required annual payment for the 1st required installment, 40% of the required annual payment for the 2nd required installment, no installment is due for the 3rd required installment, and 30% of the required annual payment for the 4th required installment." Seventy percent is supposed to be paid by June. The fourth installment lands January 15, and you can skip it by filing the return by January 31 and paying the balance.

Two more California rules that matter in exactly the income bands where residency changes happen. If your prior-year California adjusted gross income was more than $150,000, or $75,000 if married or in a registered domestic partnership filing separately, you must figure estimated tax on the lesser of 90 percent of the current year’s tax or 110 percent of the prior year’s, including alternative minimum tax. And if your California adjusted gross income is $1,000,000 or more, or $500,000 filing separately, the prior-year safe harbor is gone entirely: you have to base the estimate on the current year. A taxpayer selling a business in the year after a move is squarely inside that rule. Separately, once an estimate or extension payment exceeds $20,000, or you file a return with a total tax liability over $80,000, all subsequent California payments must be made electronically regardless of amount.

The filing mechanics for a part-year year: California uses Form 540NR, and the short form was discontinued for tax years beginning in 2019, so every part-year and nonresident filer uses the long form. New York uses Form IT-203, where you compute the tax as though you were a full-year resident and then apportion it by the share of income allocable to the resident period plus any New York-source income from the nonresident period. Neither of those is difficult. Both of them produce a number, and a large unexpected balance due with an underpayment penalty attached is a poor opening document in a year you are trying to establish that you knew exactly when you left.

Pick the move date and make it true. It should be the date you physically moved to and began residing in the new state, and it should be a date you can prove with a lease or closing document, a moving company invoice, a utility start date, and a presence record for the days around it. Everything else in this list follows from that date rather than setting it.

Decide the origin-state home on purpose. The single largest factor in both the California and New York analyses is the home you kept and how you use it. Selling or surrendering it removes New York’s permanent place of abode prong entirely and takes statutory residency off the table regardless of day count. Keeping it is a legitimate choice, and it means you have chosen to live inside a 184-day test and should say so out loud to whoever is advising you.

Start the presence record on January 1, 2027, not in April when you file. Any part of a day counts in both New York and California. Reconstructing a year of presence from memory, credit card statements and airline emails after the state opens an examination is how people who were genuinely under the line lose anyway.

If a liquidity event is coming in 2027, settle the residency position well before it rather than around it. A late-December move date followed by a January or February gain is the trigger pattern both states name. Moving the date earlier is usually impossible; moving the transaction later, or accepting that the origin state will examine it, is the real choice.

Do not skip the sourcing question. Ask specifically about equity compensation that vested against origin-state workdays, deferred compensation earned there, income from a business still operating there, and income from real property you still own there. Bragg won residency and still owed six figures on sourcing. A clean 2027 residency year and a clean 2027 tax bill are two different things.

If Florida is the destination and you own the home, own and occupy it as your permanent residence by January 1, 2027, then file the homestead application by March 1, 2027. Get the Florida license, the vehicle registrations and the voter registration to the homestead address, because the property appraiser will ask for them, and end any residency-based property tax benefit in the state you left, including a New York STAR exemption, before you claim one in Florida.

Handle the license, the registrations and the voter registration on their own clocks, promptly. Florida: 30 days for the license, 10 for vehicles. Nevada: 30 and 45. Texas: 90 and 30. A January license after a late-December move is correct. A June license is a gap somebody will characterize for you.

Move the things that are not on any government form. The physician, the dentist, the accountant, the attorney, the primary bank branch, the mailing address on financial statements, the club memberships, the place of worship. California’s published factor list includes the location of your medical professionals, accountants and attorneys, the banks where you maintain accounts, and the origination point of your financial transactions. Publication 1031’s own failing example turned in part on social and business connections that never moved.

Recalculate the January 15 payment against the year you actually had. If you moved mid-year, your withholding does not match your part-year liability, and if 2027 includes a large gain, check whether the $1,000,000 rule removes your prior-year safe harbor before you rely on it.

The Mobility Map records days and nights by state as they happen, which is what a year-end move actually needs, because the record that matters starts the day after the deadline you are chasing. It counts the way the states count: any part of a day in New York is a full day under 20 NYCRR 105.20, and California applies the same any-presence approach when it runs the nine-month presumption under Revenue and Taxation Code section 17016 or a closest-connections analysis.

Evidence Vault holds the dated set this article keeps pointing at: the lease or closing documents for the new home with their dates visible, the disposition of the origin-state home and its sale or surrender terms, the new state’s driver license with evidence of the old one being surrendered, the vehicle registrations, the voter registration, the recorded declaration of domicile under Fla. Stat. section 222.17 or NRS 41.191, the homestead application and its supporting documents, the mail redirection, the new physician and dentist records, and the part-year returns themselves, Form 540NR or Form IT-203.

AuditIQ surfaces the contradictions a late-year move produces most often: a claimed December move date with no dated evidence in the new state until spring, a New York abode held past 10 months of the following year while New York presence runs toward 183 days, a homestead or residency-based property tax benefit claimed in two states at once, a driver’s license or vehicle registration still current in the origin state, financial statements still routing to the origin-state address, and origin-source income reported as though a residency change re-sourced it.

ResidencyIQ organizes records and highlights potential exposure factors. It is not a law firm or an accounting firm and does not provide legal or tax advice; work with a qualified CPA or tax attorney on your own domicile, filings, and state exposure.

The California definition of domicile quoted throughout, including "the place where you voluntarily establish yourself and family, not merely for a special or limited purpose, but with a present intention of making it your true, fixed, permanent home and principal establishment," the note that "The maintenance of a marital abode in California is a significant factor in establishing domicile in California," the rule that "You can have only one domicile at a time. Once you acquire a domicile, you retain that domicile until you acquire another," the three-part change of domicile test requiring "Abandonment of your prior domicile," "Physically moving to and residing in the new locality" and "Intent to remain in the new locality permanently or indefinitely as demonstrated by your actions," the part-year rule that "Part-year residents of California are taxed on all income received while a resident and only on income from California sources while a nonresident," the published factor list including the location of your spouse and children, principal residence, driver’s license, vehicle registrations, professional licenses, voter registration, banks, the origination point of your financial transactions and the location of your medical professionals, accountants and attorneys, the statement that "You will be presumed to be a California resident for any taxable year in which you spend more than nine months in this state," and Example 3 in full, including the determination that "Your declaration of residency in Nevada does not establish residency in that state," are in FTB Publication 1031, Guidelines for Determining Resident Status (2025): https://www.ftb.ca.gov/forms/2025/2025-1031-publication.pdf.

The California installment percentages quoted as "Installments due shall be 30% of the required annual payment for the 1st required installment, 40% of the required annual payment for the 2nd required installment, no installment is due for the 3rd required installment, and 30% of the required annual payment for the 4th required installment," the fourth installment falling on January 15 with the early-filing alternative, the requirement that filers with prior-year California AGI above $150,000 ($75,000 if married or RDP filing separately) figure estimated tax on the lesser of 90 percent of the current year or 110 percent of the prior year including AMT, the removal of the prior-year safe harbor for taxpayers with California AGI of $1,000,000 or more ($500,000 filing separately), and the mandatory electronic payment thresholds of an estimate or extension payment exceeding $20,000 or a return with total tax liability over $80,000, are in the 2025 Instructions for Form 540-ES: https://www.ftb.ca.gov/forms/2025/2025-540-es-instructions.html.

The federal 2026 estimated tax due dates of April 15, 2026, June 15, 2026, September 15, 2026 and January 15, 2027, and the quoted exception that "You don’t have to make the payment due January 15, 2027, if you file your 2026 tax return by February 1, 2027, and pay the entire balance due with your return," are in Form 1040-ES (2026): https://www.irs.gov/pub/irs-pdf/f1040es.pdf.

The Florida homestead exemption requirement quoted as "A person who, on January 1, has the legal title or beneficial title in equity to real property in this state and who in good faith makes the property his or her permanent residence," the $25,000 exemption and the additional exemption of up to $25,000 on assessed valuation greater than $50,000 for all levies other than school district levies with its annual inflation adjustment, is section 196.031 of the Florida Statutes: https://www.flsenate.gov/Laws/Statutes/2026/196.031. The March 1 application requirement quoted as "file an application for exemption with the county property appraiser ... on or before March 1 of each year," the waiver language that "Failure to make application, when required, on or before March 1 of any year shall constitute a waiver of the exemption privilege for that year, except as provided in subsection (8) or subsection (9)," the postal error exception and the 25-day late-filing and value adjustment board petition path, are in section 196.011: https://www.flsenate.gov/Laws/Statutes/2026/196.011. The evidence a property appraiser requires for the exemption, including the Florida driver license, voter registration and vehicle registration at the homestead address and proof of no residency-based benefit claimed elsewhere, is in the Florida Department of Revenue’s Form PT-113: https://floridarevenue.com/property/documents/pt113.pdf.

The Florida declaration of domicile, including the sworn statement filed with the clerk of the circuit court containing "a declaration that the person making the same is, at the time of making such statement, a bona fide resident of the state," the subsection (2) declaration that a Florida place of abode "constitutes his or her predominant and principal home," and the subsection (4) mechanism by which a person living in Florida but domiciled elsewhere may "manifest and evidence his or her permanent domicile and intention to permanently maintain and continue his or her domicile" in the other state, is section 222.17 of the Florida Statutes: https://www.flsenate.gov/Laws/Statutes/2026/222.17.

The Nevada declaration of domicile under NRS 41.191 and its filing with the district court clerk are at https://law.justia.com/codes/nevada/2010/title3/chapter41/nrs41-191.html. The Nevada homestead exemption protecting equity "which does not exceed $605,000 in value" and requiring a recorded declaration of homestead is NRS 115.010(2) and chapter 115 generally: https://www.leg.state.nv.us/nrs/NRS-115.html. The Legislative Counsel Bureau fact sheet that still states the older $550,000 figure, along with its description of the recording requirement, is at https://www.leg.state.nv.us/Division/Research/Publications/Factsheets/HomesteadExemption.pdf.

New York’s 2022 change defining "substantially all of the year" for the permanent place of abode prong as a period exceeding 10 months rather than more than 11 months, and the guideline treatment allowing separate leases to be combined across a year, are discussed in Hodgson Russ’s analysis of the updated Nonresident Audit Guidelines: https://www.hodgsonruss.com/Noonans-Notes-Blog/new-guidelines-and-a-new-rule-for-new-york. The audit process itself, including its document-intensive 12 to 24 month duration, is described in the firm’s published residency audit guide: https://www.hodgsonruss.com/assets/htmldocuments/1_2_1/Alerts/2012/Residency%20Audit%20Handbook%202012_030612.pdf.

Matter of Gregory Blatt, including the $430,065 notice of deficiency canceled, the November 2009 Texas domicile change against a Texas driver’s license and voter registration obtained only in April and May 2010, the retained Manhattan apartment and Hamptons boat, the finding that his dog "was his near and dear item which reflected his ultimate change in domicile to Dallas," and the administrative law judge’s refusal to adopt the parties’ day counts, is DTA No. 826504 (Determination, Feb. 2, 2017): https://www.dta.ny.gov/pdf/determinations/826504.det.pdf. Matter of Stephen C. Patrick and Clara Scurati-Manzoni Patrick, including the $1,681,160 in asserted tax, $2,189,743.84 with interest and penalties, canceled, the 168 New York days against 82 Paris days in 2011 and 183 against 92 in 2012, and the Division’s assertion of domicile without a statutory residency claim, is DTA Nos. 826838 and 826839 (Determination, June 15, 2017): https://www.dta.ny.gov/pdf/determinations/826838.det.pdf.

Appeals of Stephen D. Bragg, including the holding that Bragg "was a resident of Arizona in 1993" and that he "although a California resident at one time, left the state in 1993 for other than a temporary or transitory purpose," the covenant not to compete paying $1,333,333 a year with a community property half of $666,666.50, the 84.05 percent apportionment to California, and the sustained assessments of $48,153 for 1993 and $42,658 plus a $10,664 late filing penalty for 1995, is 2003-SBE-002 (Cal. State Bd. of Equalization, May 28, 2003), Nos. 110567 and 119357: https://ota.ca.gov/wp-content/uploads/sites/54/2022/03/03-sbe-002-Bragg_rs.pdf.

California’s nine brackets from 1 percent to 12.3 percent plus the 1 percent Mental Health Services Tax above $1 million of taxable income for a 13.3 percent top marginal rate, the taxation of capital gains as ordinary income, the uncapped 1.1 percent State Disability Insurance withholding since 2024, the four-year assessment window for filed part-year and nonresident returns against the absence of any statute of limitations where no return was filed under Revenue and Taxation Code section 19057(a), the $15,000 to $75,000 and higher informal defense cost range, the enforcement methods including cell phone geolocation, credit card transaction data, DMV and voter file cross-checks, declared-homestead cross-references and private investigators, the description of a late-December claimed move date followed by a January capital gain as a classic audit trigger, the Form 540NR filing path with the short form discontinued for tax years beginning in 2019, and the treatment of equity compensation, deferred compensation, California business income and California real property income as retaining California source, are from our California residency guide.

New York’s statutory residency test under Tax Law section 605(b)(1)(B) requiring both a permanent place of abode maintained for substantially all of the taxable year and more than 183 days in the state, the any-part-of-a-day counting rule under 20 NYCRR 105.20 with its narrow medical and pass-through exceptions, the nine state brackets from 4 percent to 10.9 percent with the top rate reserved for taxable income above roughly $25 million, the New York City resident tax topping out at 3.876 percent and the resulting combined rate approaching 14.8 percent on capital gains, Matter of Gaied v. New York State Tax Appeals Tribunal on residential interest and actual use, Matter of Obus on subjective use, the STAR exemption cross-check against nonresident filing status, and the Form IT-203 part-year computation that figures tax as a full-year resident and then apportions it, are from our New York residency guide.

The Florida establishment checklist and its deadlines, including 30 days for a Florida driver license and 10 days for vehicle registration and Florida auto insurance, the 29-day pre-election voter registration requirement, the practice of property appraisers cross-checking homestead claims against out-of-state filings and DMV and voter records, and the role of the declaration of domicile as one supporting data point rather than a dispositive one, are from our Florida residency guide. The Nevada 30-day license and 45-day vehicle registration deadlines, the 28-day mail registration deadline with in-person registration through Election Day, and the recommendation of a declaration of domicile for taxpayers facing a former state’s challenge, are from our Nevada residency guide. The Texas 90-day license deadline under Transportation Code section 521.029, the 30-day vehicle registration deadline, the 30-day pre-election voter registration requirement, the April 30 residence homestead deadline with late filing up to two years back, the $140,000 school district exemption enacted by the November 2025 constitutional amendment and Senate Bill 4, and the requirement that the driver’s license address match the homestead property, are from our Texas residency guide.