It almost never comes the year you move. Residency audits arrive on a delay — typically two to four years after the part-year return — because the state’s selection process runs on hindsight: the final return of a high earner, followed by federal data showing income the state never taxed, flagged by analytics built for exactly this pattern. By the time the envelope arrives, the year in question is a memory, which is precisely the point. The state has your cell records’ worth of time to prepare. You have what you kept.
Most of this blog is about living the move correctly. This post is about the examination of it — the actual anatomy of a residency audit, stage by stage, because people who know the arc in advance make better decisions at every step of it, starting with the first one.
Stage One: The Letter and the Questionnaire
The opening move is unassuming: a notice that your return for a given year is under review, accompanied by a nonresident audit questionnaire. It asks, in friendly bureaucratic prose, for the story of your year: addresses of every home you own or rent, where your spouse and children lived, where the children attended school, your employer and business interests, the whereabouts of “items near and dear” — the art, the heirlooms, the dog — your club memberships, your doctors, and, pointedly, a day-by-day accounting of where you were physically present all year.
Two things to understand about this document. First, it is evidence. Every answer will be checked against records you don’t control — cell tower data, card transactions, toll crossings, flight manifests — and an answer contradicted by the data costs credibility that the rest of the audit never recovers. Second, it is strategy. The questionnaire’s structure is the audit’s structure: half of it maps the domicile factors, half of it sets up the statutory residency day count. How you answer shapes which fight you’re in.
This is also the stage where the single best procedural decision gets made or missed: representation, immediately. A residency audit is not a math check; it is an adversarial proceeding about the story of your life, conducted by an examiner who does these full-time. The taxpayer who fills out the questionnaire alone over a weekend, candidly and from memory, routinely concedes the case in week one without knowing it. Have your tax attorney or CPA manage every response from the first envelope.
Stage Two: The Document Demands
The questionnaire’s sequel is the information document request — and its scope startles people. Expect to be asked for some combination of: cell phone statements with tower-level detail, credit and debit card statements for every account, bank records, E-ZPass and toll histories, flight records and frequent-flyer activity, utility bills for each residence (consumption patterns show occupancy), landline records, club and gym swipe logs, medical and veterinary records, employer travel and expense reports, and your calendars.
The examiner is assembling two mosaics at once. The day-count mosaic places you somewhere specific every day of the year — and under the counting rules, the days you can’t place get presumed against you, which is how a taxpayer’s remembered 150 New York days becomes the state’s documented 190. The life mosaic weighs where the year’s living actually happened: where the money was spent, the groceries bought, the teeth cleaned. You will be struck, watching it assemble, by how much of your life is already in third-party records — which is why the audit is won by the person whose own records are better than the state’s, not by the person with the better story.
Stage Three: The Two Battles
With the records in, the audit resolves into the two battles this blog keeps returning to, fought in order.
The day count first, because it’s cheaper for the state: if you kept an abode there and the documented count clears 183, statutory residency applies and your domicile argument never gets heard. The fight here is granular — contested travel days, claimed transit and medical exceptions, gaps in the record — and it is arithmetic with receipts. A contemporaneous, evidence-backed count ends this battle in an afternoon. A reconstructed one loses it by attrition, edge case by edge case.
The domicile narrative second. If the day count holds, the examiner turns to whether the move was genuine — the center-of-life analysis across homes, family, possessions, community, business, and patterns, with the burden of proving the change typically on you, and in New York by clear and convincing evidence. This is the battle where the quality of the original move decides everything: the completed checklist, the homestead, the moved life. Nothing done during the audit can improve facts set three years earlier; the examiner is simply grading work already submitted.
Stage Four: The Assessment and the Table
The audit ends in a proposed result: no change — it happens, more often for taxpayers with clean records than the folklore suggests — or an assessment: residency for the year(s), tax on the full income, interest running from the original due dates, and potentially penalties.
The assessment is an opening position, not a verdict. What follows is procedural: a conference or protest stage with the examiner’s office, an administrative appeal (conciliation, in New York’s vocabulary), then a tax tribunal and the courts beyond. Each step has deadlines that forfeit rights if missed, and each is a settlement table — most residency disputes resolve somewhere along this ladder, on terms that track the strength of the day-count record more than any other single factor. The full cost arc — professional fees, years of process, multi-year exposure when one audited year invites its neighbors — is its own post, and its conclusion belongs here too: the cheap version of a residency audit is the one your records end early, and the expensive version is rarely about the law. It’s about gaps.
What Decides It — Compressed
Reading the stages back, the audit turns on things fixed long before the letter:
- The contemporaneous day record. The single highest-leverage item in the file. It ends the statutory battle, anchors the domicile story, and sets the settlement price.
- The genuineness of the original move. Auditors grade the year you lived, not the binder you assembled.
- Consistency. Questionnaire answers, records, and returns that agree with each other — and with the third-party data.
- Early representation. The case is usually shaped irreversibly in the first sixty days.
The letter itself you can’t prevent — high income plus a residency change is the trigger, and you supplied both. What you control, entirely and in advance, is what the file looks like when it opens.
Where Southbound Fits
Item one on that list is what Southbound exists to produce.
Southbound is an iOS app that builds the contemporaneous day record passively, from the day you install it. iOS’s significant-location-change system — not battery-draining GPS — logs each day as a Florida day or a non-Florida day automatically, with location evidence behind every entry and no gaps for an examiner to fill with presumptions. The Departure Budget keeps the running count visible all year, and when the letter arrives, the entire day-by-day record exports as a clean CSV from your own iCloud account — Southbound runs no servers and never sees your location history — ready for your attorney’s first response instead of your ninth month of reconstruction.
Southbound is on the App Store, free during the early-adopter launch period. The audit, if it comes, will be about a year you’ve already lived. Make sure that year kept its own records.
This post is for general informational purposes only and does not constitute tax or legal advice. Audit procedures, burdens of proof, and appeal rights vary by state, and deadlines are unforgiving. If you have received a residency questionnaire or audit notice, engage a qualified tax attorney or CPA experienced in residency examinations before responding.
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Published Jul 20, 2026