What a State Residency Audit Actually Asks For, Month by Month

Almost everyone imagines a residency audit as a single event: a thick envelope arrives, it demands seven years of everything, and the fight begins. That is not how these cases run. A residency audit is a sequence, it unfolds over roughly a year to two years, and each step is designed to narrow the next one. The states publish the sequence. New York’s Nonresident Audit Guidelines and California’s Residency and Sourcing Technical Manual are both written for their own auditors, and both are public.

New York’s guidelines describe the opening move plainly. "In most cases, the first communication a taxpayer receives from the Department is a cover letter with the residency questionnaire requesting information on domicile and the number of days spent in New York." The guidelines then explain why that first contact is deliberately small: "The residency questionnaire provided in the Appendix has been designed to request a minimal amount of information from an individual during the initial review of the return. The answering of a few general questions may permit the auditor to determine whether an audit is actually necessary or to narrow the focus of the audit."

California opens the same way and puts a clock on it. Under RSTM 4450, "The Initial Contact Letter (ICL) establishes and communicates your purpose for contacting the taxpayer. An ICL for the Residency issue will generally identify the issue under examination and request a person to contact." Both the residency and sourcing versions "should use a 30-day ‘reply by’ date." The manual then tells the auditor to call before sending anything heavy, and to set expectations: "Explain that there is a 30-day turn-around time frame for responses to IDRs and for your responses to the representative."

New York goes further and forbids the opening most taxpayers fear. "The first communication with the taxpayer should never be a request for voluminous documentation and a statement that the taxpayer will be assessed as a resident unless all the material is produced in an unreasonably short period of time or the taxpayer agrees to extend the statute. Such requests are unreasonable and assessing additional taxes automatically unless the taxpayer agrees to extend the period is contrary to Audit Division policies and procedures." The small letter is not a courtesy. It is policy, and it is the reason the real demand arrives later, after your first answers have already fixed the shape of the case.

The New York Nonresident Audit Questionnaire is reproduced in full in the appendix of the guidelines. It is two pages and ten questions, and it is worth reading before you ever receive one, because the answers become the frame every later document is measured against.

Question 1 asks what the last year was that you filed a New York resident return. Question 2 is the one that decides most domicile cases: "If you were at any time a domiciliary of New York State, what was done to change your status from a resident to a nonresident? Please provide detailed information relative to your intentions." That is an invitation to write your own theory of the case, in your own words, before you have seen a single document the auditor holds.

Question 3 asks for your employer’s name and address, or where you carry on your business. Question 4 asks whether you were associated with any other business activities conducted in New York, naming partnerships, LLCs, and S corporations. Question 5 asks whether you maintained living quarters in New York, "owned or rented" or "otherwise had living quarters provided for you by another individual or your employer," and asks for the inclusive dates. Question 6 is a short checklist about those quarters: Rent Controlled, Rent Stabilized, STAR Exemption, Manhattan Parking Exemption. Question 7 asks where you regularly stay in New York if you do not maintain living quarters there.

Then come the two questions the entire statutory residency test runs on. Question 8: "For each year of the audit period, how many days or part days were you physically present in New York State for work purposes?" Question 9 asks the same thing for "nonworking days such as weekends, vacations, holidays, illness and any other nonworking days during each year." Question 10 is free space for anything you want to add.

At the bottom, above the signature line and a request for your date of birth: "I DECLARE THAT THE ABOVE STATEMENTS ARE TRUE, CORRECT AND COMPLETE TO THE BEST OF MY KNOWLEDGE AND BELIEF." Most people answer questions 8 and 9 from memory, because at that point memory is all they have. The rest of the audit is the state testing that number against records you did not write.

California builds its opening frame from the return instead of a questionnaire. RSTM 4310 tells the auditor to note the responses to the residency questions on Schedule CA (540NR), the address on the return, the addresses on the W-2s and 1099s, the state tax information on the W-2s, the employer’s address, and, tellingly, the address of the tax preparer. The manual also lists where residency cases come from in the first place, and the list is broader than a computer screen: claims for refund, discovery projects, other program and departmental referrals, informant cases, Special Investigation referrals, filing enforcement referrals, law enforcement and other agency referrals, and federal Revenue Agent Reports.

This is the step people picture when they picture an audit, and New York publishes the list. The guidelines introduce it carefully: "The following are examples of personal and business records that are typically requested during the course of a residency audit. The list is intended to be a general guide and not meant to suggest that every item need be requested; the exact records needed will be determined by the particular facts and circumstances of each audit."

The personal records are these. Personal diaries and calendars, in written or electronic form. Credit card statements and receipts. Bank records including monthly statements, canceled checks and ATM receipts, with the guidelines noting that "Bank statements should be reviewed for the address to which they are sent" and that canceled checks may reveal "the existence of other credit cards not mentioned by the taxpayer." Telephone records for both the New York and non-New York residences. Utility bills for both residences "that may reflect regular or seasonal use." Homeowner’s insurance policies "to show the location where valuable items are kept." Itineraries for commercial flights or flight logs for private carriers. Hotel receipts. EZ Pass records for automobile usage. Moving bills "to show that furniture and other items have been transferred to a new residence." Security or swipe cards providing access to office buildings.

The business records are shorter: business logs or diaries, corporate credit card statements and receipts, corporate minutes, employment contracts, and expense vouchers.

Read that list as a single sentence and its logic is obvious. Every item is a record somebody else created, on a date somebody else stamped, about a place you were. That is the whole design. The Tax Appeals Tribunal said so directly in Matter of R. Michael Holt, DTA No. 821018, quoted in the guidelines: these audits "are very fact intensive and require specific evidence through substantiating contemporaneous records to show a taxpayer’s whereabouts on a day-to-day basis during each year in question. Such records could include not only day calendars but airline tickets, restaurant and hotel receipts and credit card statements."

California sequences the same material differently, and the difference is worth knowing if you are moving from California to Texas and expecting a New York style document dump. RSTM 4560 calls financial records "the most useful, but most sensitive, documents obtained during a residency audit," and instructs the auditor to map the accounts before asking for the paper: "Generally, request information regarding the financial accounts before requesting copies of the actual documents. Include the following information in the request: account numbers, branch locations, authorized signatories and users on each account, type of account, and the date each account was opened and closed. Having this information first, allows you to assess which financial documents you need to obtain." The auditor is also told to find accounts you did not mention, by "reviewing federal Schedule B."

California’s information document requests carry a standing instruction that catches people who answer casually. RSTM 4520 suggests this note on IDRs: "If the requested information could not be located, please provide a description of the search procedures used in the attempt to locate this information. If the requested information was located but was not provided due to a claim of privilege, please provide a privilege log for the documents withheld, including the nature of the privilege claimed, and the names, titles, and roles of all individuals who prepared or received the documents (including cc’s and bcc’s)." Partial answers do not close the request. The manual notes that "The taxpayer’s partial furnishing of some of the information requested does not preclude the department from issuing demand letters and ultimately a failure to furnish penalty with respect to the remaining information."

By this stage the auditor is no longer asking what your day count was. The auditor is building one. California states the task in a single line, RSTM 4570: "Perform an independent analysis of the taxpayer’s physical presence within and without California by reviewing the taxpayer’s records." The tools are listed: "credit card statements, bank statements, airline tickets, travel expense reports, third-party confirmations, and correspondence." And the output is specified: "Prepare calendars to reflect a taxpayer’s physical presence for each year under audit."

That is the number that ends up opposite yours. If you answered questions 8 and 9 from memory eight months earlier, this is where the gap appears, and the gap itself becomes an issue separate from the underlying days.

When your records do not settle it, the state goes outside. California’s RSTM 4530 lists the triggers for contacting a third party: the taxpayer does not possess the information, no alternative sources provide it, nothing supports the facts the taxpayer gave, or the third party holds the original source of the records. New York’s auditors are told to go look in person. "The auditor should make every attempt to visit the New York place of abode... This personal observation should include checking the names on the mailbox, checking the license numbers of any vehicles on the premises, interviewing the doorman, building superintendent and mailman, if necessary." The guidelines add that the auditor should photograph the residence where possible, and should consider visiting the out-of-state home too, for comparison.

If documents still do not arrive, there is a subpoena. The New York guidelines cite Avildsen for the proposition that "if the Division wishes to obtain documents in the possession of the taxpayer that the taxpayer refuses to introduce into evidence, the Division can use its subpoena power to obtain these documents," with authority under Article 8, Section 174 of the Tax Law, to be used "as a last resort when taxpayers have been uncooperative in providing information despite multiple requests." California has a quieter version of the same leverage: RSTM 4510 reminds the auditor that "R&TC Section 19504 entitles you to photocopy documents" when a representative will show records but not release copies.

The practical asymmetry here is the whole reason this stage takes months. The state can pull a card statement and read a merchant city. You cannot un-ring a weekend you cannot account for. Anyone moving from New York to Florida or moving from Connecticut to Florida is better served by having the calendar built before the letter arrives than by assembling it in month six under a thirty-day turnaround. The Google Timeline residency importer reads your existing location history entirely in your browser, checks it against each jurisdiction’s actual statutory threshold, and uploads nothing anywhere, which makes it a reasonable way to see the shape of a year before anyone else does.

This is the step nobody warns people about, and it usually lands in the middle of the audit rather than at the start.

New York’s guidelines are direct: "If after the commencement of the audit it appears that the audit cannot be completed before the statute of limitations expires, the auditor must request a waiver extending the statute." The department is also told not to create the problem in the first place. "An audit is not to be commenced near the end of a statute of limitation period when an insufficient period of time remains to adequately address the issues of the audit." And there is a floor on the runway: "As a general rule, nonresident audits should not be started unless the auditor and the taxpayer have at least 120 days (without extending the assessment limitation period) to present and review material."

The waiver request is a real decision with real trade-offs, and it is the point at which most taxpayers first involve counsel rather than only a preparer. It is worth knowing what the underlying clock is in your state before you are asked. New York generally has three years from the date a return is filed, extending to six years where more than 25 percent of income is omitted, with no time limit at all if no return was filed, if federal changes were never reported, or if the return was false or fraudulent. California has four years from the filing date for a filed return, and no limitations period at all for a year in which no return was filed and the Franchise Tax Board believes you owed tax as a resident, under R&TC section 19057(a). Connecticut generally has three years from the filing date to assess a deficiency under Conn. Gen. Stat. section 12-733, with no limit for fraudulent or unfiled returns.

Notice what all three have in common. The unlimited exposure attaches to the year you did not file, which is precisely the year a confident mover is most likely to skip. That, and not the length of a document request, is the structural risk in a mid-year move.

California writes its conclusion down and sends it to you before it becomes an assessment. RSTM 4640: "A position letter explains the basis for the proposed adjustments. Prior to sending the position letter, discuss the results of the audit with the taxpayer and/or representative." The determination and the additional tax due go on the first page. The letter "provides the taxpayer with an opportunity to indicate agreement or disagreement with the facts and the proposed adjustments."

What follows is a defined exchange, not an open conversation. Under RSTM 4650, "If the taxpayer disagrees with your position, then the taxpayer needs to provide, in writing, the reasons for the disagreement along with supporting evidence, including applicable tax or case law, if appropriate." The auditor then writes a rebuttal letter, and RSTM 4670 describes its finality: "The rebuttal letter is the final letter communicated to the taxpayer or representative before issuing the Notice of Proposed Assessment (NPA) unless the taxpayer or representative presents relevant new information." One written position, one rebuttal, then the assessment. That is the budget.

Both states also hedge their own determination against losing it. California’s RSTM 4680 tells the auditor to identify an alternative position, such as sourcing of compensation or business income, so that tax is still properly assessed "in case your residency determination is overturned in the protest and appeal process." New York is even more explicit: "The auditor must cite not only the primary position, but also any alternative positions on the ‘Proposed Statement of Audit Changes’ when prepared. Failure to do so could prevent these issues from being addressed during the appeals process." The guidelines then give suggested wording that stacks all three theories in order: domiciliary first, statutory resident in the alternative, and nonresident income allocation in the further alternative. Beating the domicile argument does not end the audit. It moves you to the next one.

New York offers a settlement step before any of that becomes formal. "The taxpayer and the representative must be given the opportunity to fully understand and refute the findings developed during the audit without the necessity of a BCMS conference. A closing conference at the district level with the team leader and section head, program manager or district audit manager... could result in the successful resolution of the case." There is also a quiet piece of guidance in the closing section that is worth more than it looks: as soon as the case appears to be heading toward holding you a New York resident, "the taxpayer should be advised to consider filing a protective claim with his claimed state of domicile before a statute of limitations expires, in order to recover any credits to which he may be entitled." If New York wins and your new state already collected, that protective claim is the only thing standing between you and paying twice.

And if the audit ends in your favor, ask for that in writing. The guidelines require it: "If the audit results in the acceptance of the return filed, the taxpayer should be notified of that fact," and such notification "will protect the individual from subsequent audits covering the same issue for the same period."

Everything up to this point runs on soft deadlines: thirty-day turnarounds, negotiated extensions, agreed schedules. Once the notice issues, the deadlines are jurisdictional, and missing one does not get argued about later.

In New York, Tax Law section 689(b) sets the window: "Within ninety days, or one hundred fifty days if the notice is addressed to a person outside of the United States, after the mailing of the notice of deficiency authorized by section six hundred eighty-one, the taxpayer may file a petition with the tax commission for a redetermination of the deficiency." Publication 130-F puts the same point in plain language for taxpayers: "Generally, you must file your appeal within 90 days of the date the notice was issued." Within that window you choose between a conciliation conference through the Bureau of Conciliation and Mediation Services and a petition to the Division of Tax Appeals.

California runs a two-stage countdown. R&TC section 19041(a): "Within 60 days after the mailing of each notice of proposed deficiency assessment the taxpayer may file with the Franchise Tax Board a written protest against the proposed deficiency assessment, specifying in the protest the grounds upon which it is based." Section 19044(a) adds that if you asked for one in the protest, the board "shall grant the taxpayer or his or her authorized representatives an oral hearing." Then section 19045(a) closes it: the Franchise Tax Board’s action on the protest "is final upon the expiration of 30 days from the date when it mails notice of its action to the taxpayer, unless within that 30-day period the taxpayer appeals in writing." That appeal goes to the Office of Tax Appeals. Sixty days, then thirty.

Connecticut is sixty days as well, and it is specific about the address and the contents. Policy Statement 2007(2) states that a protest "must be received within 60 days or must bear a U.S. postmark that is within 60 days after the date of the notice of assessment," directed to the DRS Appellate Division at 25 Sigourney Street, Hartford. The written protest must include the tax type, the taxable period, a detailed description of the disputed issues, and, for each one, "a factual statement for each disputed issue that supports your position and a statement of the law or other authority on which you rely." After the final determination letter, "you may take an appeal to the Superior Court for the Judicial District of New Britain within one month from the date of the final determination letter."

Connecticut is the useful case study for what the end of this pipeline looks like, because the Connecticut Supreme Court described one in detail this year.

In Daniels v. Commissioner of Revenue Services, decided in 2026, an estate filed a Connecticut domicile declaration on Form C-3 UGE, the form required for the estate of any decedent who lived part-time in Connecticut but is claimed to be a nonresident at death. The court records what happened next: "The executor’s domicile declaration form triggered an audit by the audit division of the Department of Revenue Services. The audit division applied the twenty-eight factors listed in the department’s income tax regulations. See Regs., Conn. State Agencies section 12-701 (a) (1)-1 (d) (8). The audit division assigned various weights to each factor and determined that the decedent was a Connecticut resident at the time of his death for estate tax purposes."

The executor protested to the department’s appellate division, exactly the step described above, and "The appellate division issued a final determination sustaining the audit division’s assessment that the estate owed $13,198,554.60 in estate taxes." The estate then appealed to the Superior Court, arguing among other things that the auditors were not properly trained in the twenty-eight factor test and had used an undisclosed weighting system.

The Supreme Court gave the estate something significant and denied it something else. It held that the executor bears the burden of proving nondomicile "by a preponderance of the evidence," not by the higher clear and convincing standard the trial court had applied, reasoning that the elevated standard "is generally reserved for civil cases involving allegations of quasi-criminal wrongdoing or when particularly important individual rights are involved." It also held that such appeals "are to be tried by the reviewing court de novo, without the deference that generally occurs in other administrative appeals," and that the reviewing court "may afford those factors the weight it considers appropriate in light of the evidence presented on appeal." The due process challenge to the auditors’ training and weighting failed.

The lesson for anyone moving from Connecticut to Florida is not that the standard of proof got easier. It is that the same twenty-eight factor grid gets applied to your file by an auditor, weighted by a method you will not see, and that the record you produce during months two through eight is the record a court is eventually reading. The Florida side of that file matters too: the sworn declaration of domicile under Florida Statutes section 222.17 asks you to state that you reside in and maintain a place of abode in that county "which he or she recognizes and intends to maintain as his or her permanent home," along with your city, county, and state of former residence and any other places where you maintain an abode. That is a dated, sworn document about intent, filed with a county clerk, that either matches the rest of the year or does not.

Read the sequence back and the practical implications sort themselves into four.

First, the questionnaire is the highest-leverage document in the audit, and it arrives when you know the least. New York asks for your day count and your theory of the domicile change before you have seen anything. Answer it with records in hand rather than memory, and answer question 2 as if a Tax Appeals judge will read it, because one might.

Second, the document list is fixed and public, which means the file is preparable years ahead. Diaries and calendars, credit card statements, bank statements, telephone records, utility bills for both homes, homeowner’s insurance, flight itineraries, hotel receipts, EZ Pass, moving bills, office swipe records. Nothing on that list is exotic, and almost all of it is easier to collect the month it happens than three years later under a thirty-day turnaround.

Third, the day count is going to be rebuilt from other people’s records whether or not you kept your own. The only variable you control is whether your version and theirs agree. A contemporaneous count that matches card and travel records is a defense. A remembered count that does not is a second problem stacked on top of the first.

Fourth, the deadlines invert at the end. For a year or more, the timelines are negotiable, extensions are routine, and the auditor is instructed to be reasonable. Then a notice issues and you have ninety days in New York, sixty in California and Connecticut, and thirty more in California after the notice of action. People who spent a year treating the audit as a conversation are the ones most likely to misjudge that switch.

Both of the manuals quoted here reward reading in full, and neither is written for taxpayers, which is exactly why they are useful. The state has already published how it will build the case against your move. The corresponding move is to build the same file first.

The Mobility Map tracks days and nights across states as they happen, so the day count that answers questions 8 and 9 does not have to be reconstructed from memory when a questionnaire arrives. Evidence Vault organizes the residence, financial, travel, and property documentation that appears on the states’ own request lists, in the categories the auditors actually use. AuditIQ flags gaps and retained-tie exposure before an examiner finds them, and advisor sharing lets a CPA or tax attorney review the chronology directly rather than assembling it under a thirty-day document request.

This article is informational and does not evaluate any individual’s tax situation. ResidencyIQ is not a law firm or accounting firm; work with a qualified CPA or tax attorney on your own residency change or audit.

New York State Department of Taxation and Finance, Nonresident Audit Guidelines (December 2021), is the source of the passage on the cover letter and residency questionnaire as first contact, the design purpose of the questionnaire, the prohibition on opening with voluminous document demands, the 120-day rule, the statute of limitations waiver instruction, the full Nonresident Audit Questionnaire reproduced in the appendix including questions 1 through 10 and the declaration language, the personal and business records lists, the Matter of R. Michael Holt (DTA No. 821018) quotation, the personal observation instructions, the Avildsen subpoena passage and the Article 8, Section 174 citation, the alternative positions requirement on the Proposed Statement of Audit Changes and its suggested wording, the closing conference passage, the protective claim advice, and the requirement to notify a taxpayer whose return is accepted: https://www.tax.ny.gov/pdf/2021/misc/nonresident-audit-guidelines-2021.pdf.

New York State Department of Taxation and Finance, Publication 130-F, The New York State Tax Audit, is the source of the plain-language appeal deadline ("Generally, you must file your appeal within 90 days of the date the notice was issued") and the description of the audit appointment letter and representation rights: https://www.tax.ny.gov/enforcement/audit/pub-130-f.htm.

New York Tax Law section 689(b) supplies the ninety-day and one-hundred-fifty-day petition windows following a notice of deficiency: https://www.nysenate.gov/legislation/laws/TAX/689.

California Franchise Tax Board, Residency and Sourcing Technical Manual, is the source of the case identification list in RSTM 4200, the return scoping items in RSTM 4310, the Initial Contact Letter and 30-day reply-by date in RSTM 4450, the 30-day IDR turnaround in RSTM 4460, the information gathering and R&TC section 19504 photocopy note in RSTM 4510, the privilege log and demand letter passages in RSTM 4520, the third-party contact factors in RSTM 4530, the financial records sequencing in RSTM 4560, the physical presence analysis in RSTM 4570, and the position letter, taxpayer response, rebuttal letter, and alternative position passages in RSTM 4640 through 4680: https://www.ftb.ca.gov/tax-pros/procedures/residency-and-sourcing-technical-manual-disclosure.pdf, indexed at https://www.ftb.ca.gov/tax-pros/procedures/residency-and-sourcing-manual-index.html.

California Revenue and Taxation Code section 19041(a) supplies the 60-day protest window, section 19044(a) the oral hearing on request, and section 19045(a) the 30-day appeal window after a notice of action: https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC&sectionNum=19041., https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC&sectionNum=19044., and https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=RTC&sectionNum=19045.

Connecticut Department of Revenue Services, Policy Statement 2007(2), Your Rights as a Connecticut Taxpayer, is the source of the 60-day protest deadline and postmark rule, the DRS Appellate Division address at 25 Sigourney Street, the required contents of a written protest, and the one-month window to appeal a final determination letter to the Superior Court for the Judicial District of New Britain: https://portal.ct.gov/DRS/Publications/Policy-Statements/2007/PS-20072-Your-Rights-as-a-Connecticut-Taxpayer.

Daniels v. Commissioner of Revenue Services (Conn. Sup. Ct. 2026) is the source of the Form C-3 UGE domicile declaration triggering the audit, the twenty-eight factor test under Regs., Conn. State Agencies section 12-701 (a) (1)-1 (d) (8) and the weighting the audit division applied, the $13,198,554.60 appellate division determination, the holding that the preponderance of the evidence standard governs, and the holding that such appeals are tried de novo: https://www.jud.ct.gov/external/supapp/Cases/AROcr/CR354/CR354.47.pdf.

Florida Statutes section 222.17 supplies the sworn declaration of domicile filed with the clerk of the circuit court and its required contents: https://www.flsenate.gov/Laws/Statutes/2024/222.17.

The statute of limitations figures for New York, California, and Connecticut, including R&TC section 19057(a) and Conn. Gen. Stat. section 12-733, and the typical 12 to 24 month duration of a New York nonresident audit, come from ResidencyIQ’s own dossier research, with underlying citations on the New York, California, Connecticut, and Florida residency guides.