How to Prove You Were Not in a Country or State

For residency audits and tax-residence disputes, such as leaving New York or California, or arguing UK or US non-residence: what the authority actually has to be shown, how each system counts a day, and which records carry weight.

Last verified: September 2026

In short: no document proves you were absent. You prove where you were instead, for every day of the period in question, under the rule's own definition of a day. The burden is usually yours. In a New York residency audit, you must show you spent fewer than 184 days in the state, where any part of a day counts, and the audit guidelines require the evidence to be clear and convincing. Days you cannot account for are the ones that sink the case.

What you prove: A continuous, dated chronology placing you elsewhere
Who carries the burden: Usually you, the taxpayer or applicant
Strongest anchors: Official entry and exit records, boarding passes, tickets
Day-by-day fill: Card statements, phone records, toll and transit records, office access logs, calendars
Weakest link: Days with no record at all, especially travel days

Define the claim before you collect anything

"I was not there" is never the real question. The claim is always narrower and tied to a rule: fewer than a number of days in a place, in a defined period, counted in a defined way. The same trip can count as a day under one rule and not under another, so settle the rule first.

New York statutory residence

A day counts when: You are in New York for any part of the day
What you usually need to show: 183 or fewer New York days in the calendar year, if you kept a New York home

California residence

A day counts when: No fixed day rule; more than nine months in the state creates a presumption of residence
What you usually need to show: That you were not in California for more than nine months, and that your closest connections are elsewhere

UK Statutory Residence Test

A day counts when: You are in the UK at midnight, subject to deeming and transit rules
What you usually need to show: A count of UK midnights below the threshold that applies to you in the tax year from 6 April to 5 April

US substantial presence test

A day counts when: You are physically in the US at any time during the day
What you usually need to show: Fewer than 31 days this year, or a weighted three-year total below 183

Absence is proven by a chronology elsewhere

Presence can be anchored by one record: an entry stamp, a hotel check-in, an appointment in the country. Absence has no equivalent. It is argued indirectly, by showing where you were on each day and how you moved between places, so that the record leaves no room for the presence being alleged.

That makes the whole period the unit of proof, not the individual document. A departure record, an arrival record in another country and ordinary dated activity there carry more weight together than any of them alone. And the gaps matter more than the highlights: an auditor looking for New York days will go straight to the weeks you cannot account for.

New York residency audits

New York can tax you as a resident without New York being your home. Under the statutory residence test you are a resident for the year if you maintain a permanent place of abode in New York for substantially all of the year and spend more than 183 days in the state. Since tax year 2022, Audit Division policy generally reads "substantially all of the year" as more than 10 months (it was more than 11 before), which matters in the year you acquire or give up the New York home. People who move away but keep an apartment in the city are the classic audit case.

Any part of a day is a New York day. A morning in Manhattan before an afternoon flight from JFK counts. The audit guidelines recognize narrow exceptions: being in the state only to travel through it, such as changing planes or boarding transport to a destination outside New York, and days as an in-patient in a medical facility. Outpatient visits are not excluded.
The burden is on you. The regulation requires a nonresident who keeps a New York home to keep adequate records showing no more than 183 days in the state, and the Nonresident Audit Guidelines say the evidence must be clear and convincing. The guidelines do tell auditors to generally accept your account of weekend days at home in your state of domicile, absent evidence to the contrary, because weekends often leave no paper trail.
What auditors look at. The guidelines list diaries and calendars, credit card statements and receipts, phone records for both residences, bank and ATM records, E-ZPass records, flight itineraries, hotel receipts and office access swipe-card records.

A move to Florida, a New York apartment kept. In 2025 you keep your Manhattan apartment all year, so the place-of-abode condition is met. Your records put you in New York on 170 days and document 180 days elsewhere. For the remaining 15 days, all weekdays, you have nothing. 170 + 180 + 15 = 365.

To show 183 or fewer New York days, you need at least 365 minus 183 = 182 documented days outside New York. You have 180. If the 15 undocumented days cannot be placed outside the state, you cannot rule out 170 + 15 = 185 New York days, and you have not met your burden of showing 183 or fewer. Two more documented days away, from a toll record, a card charge or a boarding pass, would change the outcome.

New York City applies its own parallel resident rules, and domicile is a separate question from the day count. See New York's 183-day statutory residency rule for the full test.

Leaving California

California has no bright-line day count. Under FTB Publication 1031 you are presumed to be a California resident for any tax year in which you spend more than nine months in the state. The presumption can be overcome by satisfactory evidence that you were there only for a temporary or transitory purpose, and fewer than nine months proves nothing on its own: you can still be a resident if your closest connections are in California.

So a California dispute needs two kinds of evidence. Day records answer the nine-month presumption. Evidence of your ties answers the closest-connections question: where your home, spouse and children are, where you are licensed, registered to vote and bank, where your doctors and advisers are. The FTB weighs the strength of those ties, not just their number. There is also a safe harbor for people outside California under an employment-related contract for at least 546 consecutive days, with limits on return visits and income. See California tax residency and the nine-month presumption.

Country tax residence: UK and US

United Kingdom. Under the Statutory Residence Test a day generally counts if you are in the UK at midnight, subject to a deeming rule for people with enough UK ties and to transit exceptions. HMRC's manual says you should keep records of the countries where you spent your days and midnights, such as travel schedules, booking information, tickets and boarding cards, and, as evidence of where you live, phone bills and card and bank statements that show your day-to-day spending. Exit checks introduced on 8 April 2015 collect passport data on passengers leaving the UK on scheduled commercial air, sea and rail routes, largely through the carriers, so official departure data exists for most journeys except those within the Common Travel Area and private flights and boats. The UK has no dedicated way to request it, though. See the UK Statutory Residence Test.

United States. The substantial presence test counts any day you are physically in the US. Visitors who are not US citizens or green card holders can download up to 10 years of arrival and departure history from CBP's I-94 website, which CBP describes as a tool rather than an official record for legal purposes and which can miss land departures. US citizens and green card holders are not covered there: they request their travel records from CBP under the Freedom of Information Act. How to request each of these is in how to get your official entry and exit records.

Evidence that places you somewhere else

Rank it the way a reviewer will: official beats unofficial, exact beats approximate, and records made at the time beat anything reconstructed later.

Border and carrier records. Official entry and exit records, from the place you left and the place you went, anchor the dates of each move.
Proof of travel. Boarding passes, e-tickets for flights actually flown, rail and ferry tickets. Changed bookings need the change confirmation, not just the original.
Day-by-day activity elsewhere. Card and ATM transactions, toll and transit records, office access logs, medical and school appointments, gym check-ins. These fill the days between the anchors.
Phone and device data. Carrier records, roaming charges and location history support the pattern, but rarely settle a single day on their own.
Your own calendar or log. Kept at the time, it ties the rest together. Written afterwards, it is a summary, not evidence.

What makes an absence case weak

The claim is not defined. A vague place, period or counting rule produces vague evidence.
Unexplained gaps. Under a burden-on-you rule, a day with no record is a day you cannot claim.
One document stretched too far. A hotel invoice shows nights in a hotel, not a whole month in the country.
Hidden conflicts. When two records disagree, disclose the conflict and explain it. Silently choosing the convenient one is what an auditor looks for.
Several versions of the same history. A day count that differs between your return, your adviser's schedule and your spreadsheet undermines all three.

Keep the record while you travel

Everything above is easier when the chronology already exists. A calendar or spreadsheet updated on the day works; the point is that it was made at the time. In AtlasDays, Auto-Detect Trips uses low-power background location to notice when you arrive in a new country and adds a dated trip to your Timeline, which you can edit or undo. With AtlasDays Pro you can also track US states and create a PDF report; its first page carries a basis-of-preparation note stating that the records are maintained by you and not independently verified, and which counting rule was used: calendar days, or nights counted at midnight. It is a well-organized summary of your own records, not a substitute for the evidence behind them. If your past record has holes, rebuild it from stamps, emails and photos first.

Beyond the day count

A day count rarely decides residence alone. New York also taxes domiciliaries, and New York City has its own rules. California weighs closest connections. The UK test turns on ties as well as days, and US non-residence can depend on exceptions and treaty positions. When real money is at stake, the authority's own guidance and a tax adviser decide how the evidence is presented; this page is about building the evidence they will need.

AtlasDays keeps the day count an audit asks for

Log trips as you go, or let Auto-Detect add them when you cross a border. AtlasDays counts your days in each country, and with Pro in each US state, privately on your iPhone, so the chronology exists before anyone asks for it.

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FAQ

How do I prove I was not in New York for a residency audit?

Build a day-by-day record for the whole year showing where you were, using flight records, card and ATM statements, phone records, E-ZPass or other toll records, office access logs and calendars. Any part of a day in New York counts as a New York day, and the audit guidelines put the burden on you to show fewer than 184 days with clear and convincing evidence.

Can I get official records showing when I left a country?

Often, yes. Visitors who are not US citizens or green card holders can download 10 years of US arrival and departure history from the I-94 website, US citizens can request travel records from CBP under FOIA, and several other countries release movement records on request. Official records anchor your dates, but they rarely cover every border you crossed.

What if I have days I cannot account for?

Say so, and bound each gap between two firm dates. Where the burden is on you, an undocumented day may be treated as a day in the place you are trying to show you left, so look for any dated record, such as a toll charge, a card payment or a message, before you accept the gap.

Official sources

New York's day-counting rules, burden of proof and accepted records come from the Department of Taxation and Finance Nonresident Audit Guidelines (December 2021) and its nonresident FAQs. California's nine-month presumption, closest connections and 546-day safe harbor are in FTB Publication 1031, and the rebuttal standard in Revenue and Taxation Code section 17016. For the UK, HMRC's RDR3 Statutory Residence Test notes summarise the test, and the Residence and FIG manual covers the midnight rule, records of days and midnights and evidence of where you live. UK exit checks are described in the Home Office exit checks fact sheet. The US day rule is on the IRS substantial presence test page, I-94 travel history coverage in the CBP I-94 help, and FOIA filing in CBP's FOIA page.

About this article: AtlasDays provides general information, not legal, tax, or immigration advice. Rules change and outcomes depend on your circumstances, so never rely on it alone: check the linked official source or ask a qualified professional.