Your Neighbor Can Trigger a Residency Audit. Here’s How That Actually Works

The question gets asked quietly, usually by someone who has just put a house on the market in one state and a homestead application in another, and usually in the form of a worry rather than a question: can a neighbor actually report me? The answer is yes. It is also more boring than the worry suggests. Every state in this conversation runs a public intake channel built for exactly this, and none of them require the caller to explain how they know what they claim to know.

New York’s Department of Taxation and Finance publishes a page called Report tax evasion and fraud that describes the process as "quick, easy, and confidential." The department’s own recommendation is that "The easiest way to report suspected tax evasion and fraud is online," through a referral form the page links directly. It also lists a phone number, 518-457-0578, a fax number, 518-435-8523, and a mailing address that reads, in full: NYS TAX DEPARTMENT, REPORT SUSPECT TAX EVASION/FRAUD, INFORMATION REFERRAL UNIT, W A HARRIMAN CAMPUS, ALBANY NY 12227-2899. The unit’s name is the useful detail. New York staffs an Information Referral Unit, which is an organizational admission that information arrives from outside the building.

New Jersey is blunter about the format. The Division of Taxation’s Office of Criminal Investigation publishes a "24-Hour Recorded Tip Line: 609-322-6057 (For citizens who wish to report suspected tax violations or allegations of poor conduct or behavior by New Jersey Taxation personnel or other Department of Treasury employees)," alongside a mailing address at P.O. Box 284, Trenton. A recorded line is the lowest-friction reporting mechanism a government builds. There is no conversation, no callback, and no one asking follow-up questions.

California runs its version as a web application. The Franchise Tax Board’s Fraud Referral Report opens with three categories, and the second is "Tax fraud or tax evasion," separate from scams and from identity theft. Florida, which has no personal income tax and therefore no residency audit of its own, has the sharpest tool of the four, and it belongs to county property appraisers rather than the state. More on that below.

None of these agencies publish anything claiming that tips drive residency case selection, and it would be strange if they did. What New York does document, at length, is how a nonresident audit actually gets built, and the picture is databases rather than gossip.

The Nonresident Audit Guidelines describe the return itself as the first screen. "The IT-203 return (New York State Nonresident Return) starting with the 1988 tax year requires the taxpayer to identify any living quarters maintained in New York State. Starting in 2002, a similar question relating to living quarters in New York City appears on the IT-201 Resident return." That question was tightened over time: "This question was modified starting in 2006 to require an affirmative or negative answer from the taxpayer rather than merely marking an ‘X’ if he maintained living quarters in New York City. Those taxpayers having a PPA in New York City are further required to indicate the number of full or part days spent in the city beginning with tax year 2010."

From there the guidelines send auditors to commercial and public records before they send them to people. "One of the most effective ways to uncover a New York address is through the use of Lexis Nexus which is available in every office. A Lexis search should be routinely done especially in cases with high dollar potential." And then the property files: "In addition, the Real Estate Transfer Tax (RETT) file should be checked to determine if the taxpayer or spouse was a purchaser (grantee) or seller (grantor) of New York property."

That is what finding you looks like. A checkbox you filled in yourself, a records search, and a deed. A neighbor’s call does not replace any of it. What a call can do is put a name in front of a person who then runs all of it, on a file that might otherwise not have been opened this year. That is a real effect, and it is worth understanding precisely, because it is smaller and slower than the fear implies. The guidelines even set a pacing floor once a case is opened: "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 Palm Beach County Property Appraiser publishes an online homestead fraud report. It tells the reporter, in the office’s own words, that "you may remain anonymous, if you prefer." Then it asks for the address of the property receiving an improper exemption, the owner’s name if known, and a free-text explanation. Between those, it offers a short set of checkboxes describing why the exemption looks wrong: the property is rented, the property is vacant, it is a vacation home, or the owner has an exemption elsewhere.

That last box is a residency accusation with the tax law stripped out of it. It does not ask the neighbor to understand domicile, statutory residency, or day counts. It asks whether the people next door seem to live somewhere else. Nearly every Florida county runs a version of the same form.

The consequences are statutory and they are not small. Under Florida Statutes section 196.161(1)(b)(1), when a property appraiser determines that "a person who was not entitled to a homestead exemption was granted a homestead exemption," the owner gets "30 days to pay the taxes, penalties, and interest" before a lien is recorded, and the arithmetic is "a penalty of 50 percent of the unpaid taxes for each year and 15 percent interest per annum." The reach is up to ten years. There is a narrow escape in subsection (1)(b)(2): where the exemption resulted from "a clerical mistake or an omission by the property appraiser, the person improperly receiving the exemption shall not be assessed penalty and interest." Separately, Florida Statutes section 196.131(2) provides that "Any person who knowingly and willfully gives false information for the purpose of claiming homestead exemption as provided for in this chapter is guilty of a misdemeanor of the first degree, punishable as provided in s. 775.082 or by fine not exceeding $5,000, or both." A first-degree misdemeanor under section 775.082 carries up to a year in county jail.

Here is the bind that catches careful people. The homestead exemption is one of the standard steps in establishing Florida residency, filed with the county property appraiser by March 1, with ownership and occupancy required as of January 1. The declaration of domicile under Florida Statutes section 222.17 is the other. Anyone moving from New York to Florida or moving from New Jersey to Florida is advised to file both, and should. But both create a dated public record asserting where you live, and a public record asserting where you live is precisely the thing a neighbor in either state can point at when the assertion does not match what they see.

The mirror image is worse, and it is the most common version of this problem. New York’s STAR benefit requires that "the property must be the primary residence of an eligible owner," and the department lists the factors it weighs: "length of time spent each year on the property, where you are registered to vote, and the address you listed on your vehicle registrations and government issued IDs." ResidencyIQ’s own New York dossier lists a STAR exemption cross-check against nonresident filing status among the state’s enforcement methods. Holding a New York STAR benefit and a Florida homestead exemption in the same year is the cleanest self-contradiction available in this entire area of law, and either side can be reported by someone who lives on the block.

New York is one of the very few states that extends its False Claims Act to tax. Under State Finance Law section 189(4)(a), a tax-based claim is available only where "the net income or sales of the person against whom the action is brought equals or exceeds one million dollars" and "the damages pleaded in such action exceed three hundred and fifty thousand dollars." A successful relator takes a share of the recovery, and the defendant faces treble damages plus civil penalties. Section 189(4)(b) adds a check on the process: "the attorney general shall consult with the commissioner of the department of taxation and finance prior to filing or intervening in any action under this article that is based on a violation of the tax law."

The reach grew in 2023. Legislation signed May 3, 2023 added section 189(1)(h), which prohibits "knowingly conceal[ing] or knowingly and improperly avoid[ing]...an obligation to pay or transmit money," extending liability past false statements on a filed return to people who filed nothing at all. That matters here because the silent nonfiler, not the honest part-year filer, is the profile these residency disputes tend to produce.

The federal route is more familiar. The IRS Whistleblower Office states that "The award amount generally is 15 to 30% of the proceeds collected and attributable to" a whistleblower’s information, submitted on Form 211, with the mandatory-award track under IRC section 7623(b) limited by the Bipartisan Budget Act of 2018 to cases where proceeds in dispute exceed $2,000,000. And a federal case does not stay federal: under IRC section 6103(d), the IRS is authorized to disclose federal tax information to state and local tax authorities for tax administration purposes, and audit results are among the categories exchanged.

Read the thresholds honestly before you lose sleep over them. A million dollars of income and $350,000 of damages in New York, two million dollars of proceeds at the federal level, are not where most residency disputes live. Very few readers of this article are exposed to a qui tam action. What the statutes establish is narrower and still worth knowing: two governments have decided that private knowledge about someone else’s tax residency is worth paying for, and the people with that knowledge are the ones who can see whose car is in the driveway in February.

A neighbor’s observation is a claim about presence, and presence claims are exactly the category New York’s own guidelines warn auditors to be careful with. The guidelines maintain a list of what they call false indicators, and it reads like a catalog of everything a person on the sidewalk could reasonably misread: "‘False’ indicators that can mistakenly turn a non-New York day into a New York day include credit card purchases in New York by children, phone calls by housekeepers, and children or relatives staying at the New York address as a guest of the taxpayer when he may not be in New York."

The instruction that follows is more balanced than most taxpayers expect. "The auditor should not concentrate only on conducting an exhaustive review of third-party records focusing on NON-NEW YORK days but should equally review information submitted by the taxpayer concerning out-of-state documentation of what appears to be a New York day." Lights on and a car in the driveway is not a day. It is a hypothesis about a day, and it has to be converted into records before it does anything.

When third-party information does convert, though, it is devastating, and the guidelines showcase exactly how. In Matter of Charles J. Hull Jr. and Mary Hull, DTA No. 810833, "information obtained on audit was used successfully to discredit statements made by taxpayers regarding a claimed change of domicile. Based on third party confirmation, it was shown that the taxpayers continued to maintain memberships in New York organizations which they asserted they had resigned from upon changing their domicile to Florida. Moreover, they did not surrender their New York drivers’ licenses when they said they did and continued to register motor vehicles in the state after their purported change of domicile." The auditor also found that the Florida and New York checking accounts "were used equally, contrary to the taxpayers’ claim that a majority of checks were drawn on the Florida bank." The Tribunal sustained the assessment, and the appendix entry adds that being "less than candid with the auditor’s direct requests for information" also sank the taxpayers’ argument for penalty abatement.

The state has one more tool if the documents do not come voluntarily. Citing Avildsen, the guidelines note 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." Subpoena authority comes from Article 8, Section 174 of the Tax Law, and the guidelines describe it as something that "generally should be used as a last resort when taxpayers have been uncooperative in providing information despite multiple requests."

This is the part that almost never appears in the anxious version of the question, and it is the most useful fact in the article.

Matter of Jack & Helen Armel, DTA No. 811255, is a statutory residency case the guidelines cite repeatedly. The taxpayers had a hole in their records: December 7 through December 31, 1988, a period with neither phone bills nor Visa statements, and a period that decided whether they crossed the 184-day line. They filled it with people. The Tax Appeals Tribunal reversed the ALJ and concluded that the taxpayers "through their testimonial and documentary evidence, have clearly and convincingly proven that they were in New York less than 184 days in 1988," resting on the finding that "Mr. Armel’s credible testimony, corroborated by affidavits and letters submitted by the taxpayers’ friends and neighbors support a finding that they were in Florida for the month of December."

The Tribunal also said something taxpayers should memorize: they "need not establish their whereabouts each specific day." The guidelines endorse the reasoning in their own voice. "Since it is normal for people to display certain predictable and repetitive migratory patterns, and it is abnormal for people to document their presence in a particular location on every day of the year, an auditor should measure the credibility of a personal account in the context of an audit. The auditor should accept a taxpayer’s credible and consistent account of routine travel."

There are limits, and they are the whole game. The guidelines are explicit that "An affidavit will generally be viewed differently if it is used merely to bridge a gap in the documentary record rather than in lieu of providing any records at all." Armel worked because the rest of the year was documented; the affidavits covered one month. And an affidavit does not end anything: "Submitting an affidavit does not end the audit process. The auditor is still free to request records from the taxpayer and, if necessary, subpoena them. An affidavit should be subject to the same verification procedures as with a calendar or diary." The people who see you every day are an asset when your own records are ninety percent complete. They are not a substitute for records.

California’s enforcement inventory is the broadest of the three income-tax states here, and ResidencyIQ’s California dossier lists it in full: 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 California property still owned, social media posts and check-ins, utility and cable or internet account activity at the California residence, neighbor and informant tips, and private investigators in high-dollar disputes. The declared-homestead cross-check is the same mechanism described above, run in reverse: your Nevada or Florida paperwork is evidence California reads.

The reason a stale tip is more dangerous in California than almost anywhere else is the statute of limitations. FTB generally has four years from the filing date for a filed return, but under R&TC section 19057(a) there is no limitations period at all for a year in which no California return was filed and FTB believes you owed tax as a resident. That is what makes silent nonfilers, rather than honest part-year filers, the highest-risk profile. Anyone moving from California to Nevada should understand that the file never closes on a year you never filed for, and that California-source income does not stop being California-source income because you crossed a state line.

New Jersey works from a narrower but well-aimed list: bank and brokerage statements, cell phone records, E-ZPass toll records, airline tickets and travel documents, insurance policy riders tied to a New Jersey address, credit card statements, mortgage and home-sale records, and comparison against prior years’ resident filing history. That last item is the trigger practitioners describe most often. A taxpayer who filed as a New Jersey resident for years and then files a nonresident return the year they claim to have left, while still owning or using a New Jersey home, is the classic case.

Samuelsson v. Director, Division of Taxation (N.J. Tax Ct. 2005) shows how that ends when the checklist is the whole plan. The taxpayers obtained Florida driver’s licenses, registered vehicles in Florida, opened Florida bank accounts, and enrolled their children in Florida schools. The Tax Court held they had not abandoned New Jersey domicile anyway, because they never sold or rented the New Jersey home, never purchased Florida property, and returned to New Jersey within about a year. New Jersey’s aggressiveness rates a 4 out of 5 in our dossier, below New York and California but well above average, and its Division of Taxation has a four-year assessment window on filed returns with no limit at all on returns never filed.

The practical response to all of this is not to worry about the neighbor. It is to make the record indifferent to them.

Do not hold two residency-based benefits at once. A New York STAR benefit and a Florida homestead exemption in the same tax year is a contradiction you signed twice, and it survives no version of this. Check the exemptions on every property you own before January 1, not after a letter arrives.

Count days as they happen rather than reconstructing them later. Both the statutory tests and the false-indicator problem are day-level questions, and a day you cannot account for is a day the other side gets to characterize. The thresholds are also not uniform: most states that run a bright-line test use 183 days, but Arizona uses 274 and New Mexico uses 185, and several states run no day-count test at all and decide on domicile alone. The day count checker shows your days against each jurisdiction’s actual statutory threshold and the cited rule text, rather than the remembered version of the rule.

Close or explain the accounts that generate presence signals. Utility and cable activity at the old residence appears on California’s enforcement list and is exactly the kind of thing a neighbor observes and an auditor can pull. Keeping the house is allowed. Keeping the house with the lights, the internet, the lawn service, and the club membership running as though nothing changed is a different story, and it is the story the state will tell.

Document the routine, not just the move. Armel was won on a normal migratory pattern that friends and neighbors could describe, corroborating records that already covered most of the year. Build the year that makes a hole in December survivable. And know the people around you in the new place, because they are the ones who will be asked to swear to it.

The Mobility Map tracks days and nights across states as they happen, so the day count that answers a statutory residency question does not have to be rebuilt from card statements two years after the fact. Evidence Vault organizes the residence, financial, travel, and property documentation behind a domicile claim, including the exemption filings and utility records that create the contradictions described above. AuditIQ flags gaps and retained-tie exposure before a state examiner finds them, and advisor sharing lets a CPA or tax attorney review the chronology directly rather than assembling it under a 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.

New York State Department of Taxation and Finance, Report tax evasion and fraud, is the source of the "quick, easy, and confidential" description, the statement that "The easiest way to report suspected tax evasion and fraud is online," the 518-457-0578 phone number, the 518-435-8523 fax number, and the Information Referral Unit mailing address at the W A Harriman Campus: https://www.tax.ny.gov/help/contact/fraud/report-tax-fraud.htm.

New Jersey Division of Taxation, Office of Criminal Investigation, is the source of the "24-Hour Recorded Tip Line: 609-322-6057" and its parenthetical description, the P.O. Box 284 Trenton mailing address, and the office’s stated role investigating alleged criminal violations of the State tax code: https://www.nj.gov/treasury/taxation/office_criminal_investigation.shtml.

California Franchise Tax Board, Fraud Referral Report, is the source of the three reporting categories including "Tax fraud or tax evasion": https://webapp.ftb.ca.gov/informantdb/.

Palm Beach County Property Appraiser, Report Homestead Exemption Fraud, is the source of the "you may remain anonymous, if you prefer" language and the reporting form’s fields, including the checkbox for an owner who has an exemption elsewhere: https://pbcpao.gov/Homestead/ReportHomestead.

Florida Statutes section 196.161 supplies the improper-homestead lien procedure, the "penalty of 50 percent of the unpaid taxes for each year and 15 percent interest per annum," the 30-day payment window, the ten-year reach, and the clerical-mistake exception in subsection (1)(b)(2): https://www.flsenate.gov/Laws/Statutes/2024/196.161. Florida Statutes section 196.131(2) supplies the first-degree misdemeanor penalty for knowingly and willfully giving false information to claim a homestead exemption: https://www.flsenate.gov/Laws/Statutes/2024/196.131.

New York State Department of Taxation and Finance, Nonresident Audit Guidelines (December 2021), is the source of the IT-203 and IT-201 living-quarters questions and their 1988, 2002, 2006, and 2010 changes, the Lexis Nexus and Real Estate Transfer Tax file instructions, the 120-day rule for starting an audit, the false indicators passage, the Matter of Charles J. Hull Jr. and Mary Hull (DTA No. 810833) third-party verification discussion and appendix entry, the Avildsen subpoena language and the Article 8, Section 174 citation, the Matter of Jack & Helen Armel (DTA No. 811255) discussion and appendix entry, the affidavit weighting rules, and the passage on predictable and repetitive migratory patterns: https://www.tax.ny.gov/pdf/2021/misc/nonresident-audit-guidelines-2021.pdf.

New York State Department of Taxation and Finance, STAR eligibility, is the source of the primary-residence requirement and the factors used to determine primary residence: https://www.tax.ny.gov/pit/property/star/eligibility.htm.

New York State Finance Law section 189 supplies the False Claims Act tax provisions, including the one-million-dollar net income or sales threshold and the three-hundred-fifty-thousand-dollar damages threshold in subsection (4)(a) and the attorney general consultation requirement in subsection (4)(b): https://www.nysenate.gov/legislation/laws/STF/189. The May 3, 2023 legislation adding section 189(1)(h) and extending liability to non-filers is described in Morgan Lewis, "New York Expands False Claims Act Tax Liability for Non-Filers" (May 2023): https://www.morganlewis.com/pubs/2023/05/new-york-expands-false-claims-act-tax-liability-for-non-filers.

Internal Revenue Service, Whistleblower Office, is the source of the "15 to 30% of the proceeds collected" award range, the Form 211 submission requirement, and the Bipartisan Budget Act of 2018 limitation of IRC section 7623(b) to proceeds exceeding $2,000,000: https://www.irs.gov/compliance/whistleblower-office. The IRS description of its authority under IRC section 6103(d) to share federal tax information with state tax agencies is at https://www.irs.gov/government-entities/governmental-liaisons/state-information-sharing.

The California and New Jersey enforcement-method inventories, the R&TC section 19057(a) unlimited limitations period for unfiled years, the New Jersey assessment windows, and Samuelsson v. Director, Division of Taxation (N.J. Tax Ct. 2005) come from ResidencyIQ’s own dossier research, with underlying citations on the New York, California, New Jersey, and Florida residency guides.