Introduction: New York Statutory Residence Follows You to London
New York statutory residence is the reason many American bankers in London still receive a New York tax assessment years after they left Manhattan, and it catches sophisticated people with striking regularity. You planned the federal side impeccably. You claimed the foreign earned income exclusion, mapped your treaty position, and filed every report on time. Meanwhile, New York quietly continued to treat you as one of its own.
The mechanics are unforgiving, and the arithmetic is worse. New York taxes residents on worldwide income at rates reaching 10.9%, and New York City adds up to 3.876% on top. Crucially, New York grants no credit whatsoever for income tax paid to the United Kingdom. Consequently, a London-based managing director can pay 45% to HMRC and then pay New York again on the same salary, with no relief on either side.
Furthermore, the US-UK income tax treaty offers no protection here. Treaties bind the federal government, not individual states, so nothing in the treaty reaches Albany. At TaxYork we untangle this position for banking, fund and private equity clients every year. Below, we explain exactly how the rules work, where the escape routes lie, and what six careless days can cost.
What New York Statutory Residence Actually Means
New York statutory residence is a separate and additional test to domicile. Under 20 NYCRR 105.20, you are a New York resident if you are domiciled in the state, or if you are not domiciled there but maintain a permanent place of abode and spend more than 183 days of the year within the state.
Notably, those are two independent routes to the same outcome. Someone who has genuinely changed domicile to England can still be caught by the second test. Additionally, someone who has never set foot in a New York office in a given year can remain taxable through domicile alone.
The distinction matters because the defences differ entirely. Domicile turns on intention and a body of evidence. Meanwhile, New York statutory residence turns on two mechanical questions: did you maintain a qualifying dwelling, and did you count too many days?
The Two Mechanical Tests
The first limb requires a permanent place of abode maintained for substantially all of the taxable year. Historically the Department applied an eleven-month standard. However, for tax years from 2022 onward, auditors work to a threshold of more than ten months, which widens the net appreciably.
The second limb is the day count, and it is stricter than most people assume. New York applies what practitioners call the minute rule. Therefore, any part of a day spent physically within the state counts as a full New York day, whether you attended a board meeting or merely changed planes and stayed the night. Limited exceptions exist for travel purely in transit and for hospital treatment.
Why 183 Days Is Really 184
The rule is universally described as the 183-day rule, yet the statutory language requires more than 183 days. Accordingly, 183 days keeps you outside New York statutory residence and 184 days brings you inside it. That single day has decided a great many audits, which is why we insist that clients keep contemporaneous records rather than reconstructing a calendar afterwards.
How New York Statutory Residence Taxes Your London Salary
Once New York statutory residence applies, New York taxes your worldwide income. Your London salary, your UK bonus, your carried interest, and your investment income all fall within the New York base. Specifically, the state does not care that the work was performed three thousand miles away.
New York Does Allow the Foreign Earned Income Exclusion
There is one genuine piece of good news. New York taxable income begins with federal adjusted gross income, and the foreign earned income exclusion reduces federal gross income before AGI is struck. Therefore, the exclusion flows through automatically, and 20 NYCRR 151.7 confirms the treatment.
For 2026 the exclusion reaches $132,900 against your New York statutory residence base, with a base housing amount of $21,264 and a general housing cap that lifts the combined shelter well above $170,000. Consequently, a modestly paid expatriate may escape New York tax almost entirely. However, that ceiling is irrelevant to anyone earning a City of London package.
New York Allows No Credit for UK Tax
Here is the point that costs real money, and almost no published guide frames it for a British-resident reader. New York grants a resident credit for tax paid to another US state, and for tax paid to a province of Canada. Under New York Tax Law § 620, that is the complete list of foreign relief.
The United Kingdom does not appear. Accordingly, the 45% additional rate you paid to HMRC generates no New York credit at all, and no carryover to future years. Unlike the federal foreign tax credit, which shelters most high earners completely, the New York charge simply stacks on top. New York statutory residence therefore converts UK tax from a credit into a pure cost.
The Treaty Does Not Reach Albany
Clients frequently assume the US-UK income tax treaty will rescue them. It will not. The treaty binds the federal government, and states are not parties to it. Moreover, New York has never adopted treaty conformity by statute. Thus, a treaty position that works perfectly on Form 1040 has no effect whatever on Form IT-201.
The 548-Day Rule: The Real Escape From New York Statutory Residence
Domiciliaries facing New York statutory residence who move abroad have one meaningful statutory escape, and it is narrow. The 548-day rule in Tax Law § 605(b)(1)(A)(ii) treats a domiciliary as a nonresident for a qualifying period spent overseas. In our experience, it is the single most valuable and most frequently botched provision in this area.
The Three Conditions
First, within any period of 548 consecutive days, you must be present in a foreign country or countries for at least 450 days. Second, you must not be present in New York State for more than 90 days during that same period. Third, a proportionality test applies to any part-year at either end of the window.
That third condition trips people up. Specifically, for a short period of less than a full taxable year, your New York days must not exceed 90 multiplied by the days in the short period, divided by 548. Therefore, a three-month tail at the start of a secondment permits roughly fifteen New York days, not ninety.
The Spouse and Children Trap
The 90-day cap does not apply to you alone. Critically, your spouse and your minor children must also stay under 90 New York days, unless you are legally separated. Many bankers relocate to London while a spouse remains in Manhattan through a school year, and that arrangement destroys the safe harbour outright.
Furthermore, a recent Division of Tax Appeals determination in the Lynch matter, decided in April 2025, confirmed that factual separation is not enough. The taxpayer must be legally separated for the spouse's days to be disregarded. Accordingly, couples living apart informally should assume the spouse's New York presence counts against them.
Documentation Wins or Loses These Cases
New York auditors are notably aggressive on day counts. They request passport stamps, flight records, mobile telephone location data, credit card statements and building entry logs. Consequently, we advise clients to run a contemporaneous day log from the first day of a secondment, rather than assembling evidence once an audit letter arrives.
Defending a New York Statutory Residence Assessment
Where the safe harbour has already failed, two lines of defence remain. Both attack the permanent place of abode limb rather than the day count, because days are rarely arguable after the fact.
The Residential Interest Argument
New York courts have narrowed the permanent place of abode test considerably. In the Gaied decision, the Court of Appeals held that a dwelling only counts where the taxpayer maintains a residential interest in it, meaning the property must actually serve as his residence rather than merely being available.
The Appellate Division applied that reasoning again in the Obus matter. There, a five-bedroom house suitable for year-round use failed the test because the taxpayer used it two or three weeks a year, kept no personal effects there, and lived more than two hundred miles away. Therefore, a genuinely unused property may fall outside New York statutory residence even though it is habitable.
The Ten-Month Question
The second defence is duration. If the dwelling was disposed of, let on a genuine arm's length lease, or otherwise not maintained by you for more than ten months of the year, the first limb fails and New York statutory residence cannot apply. Importantly, a letting must be real. A nominal tenancy to a relative, with a room reserved for your use, will not survive examination.
New York City Is a Separate Question
New York City applies its own residence test using the same statutory definitions. Consequently, you can be a New York State nonresident and a New York City resident, or the reverse, and the Department of Taxation and Finance assesses each separately. Given that the top city rate of 3.876% begins at only $90,000 of taxable income for a joint filer, the city exposure is rarely trivial.
Deferred Compensation and Equity: The Tail New York Never Releases
Even a clean break from New York statutory residence leaves one exposure behind. Escaping New York statutory residence ends the worldwide charge, yet New York still taxes nonresidents on New York-source income, and compensation earned while working in the state remains New York-source when it is eventually paid.
Bonuses and Deferred Awards Follow the Work, Not the Payment
Suppose you spent four years in a Manhattan trading seat before transferring to London. Deferred cash and equity granted for that New York service stay New York-source, and the state expects an allocation when the awards vest. Consequently, a nonresident return can be due for years after you leave.
Allocation normally follows a workday formula, comparing New York workdays to total workdays across the period the award was earned. Therefore, precise records of your historic New York working pattern matter long after you stop living there. In our experience, banks rarely provide this allocation automatically, and payroll simply withholds on the whole amount.
Why This Interacts Badly With the Foreign Tax Credit
The federal position compounds the problem. HMRC will often tax the same vesting in full where you are UK-resident when the award vests, while New York taxes the New York-service portion. Meanwhile, the federal foreign tax credit relieves the UK tax federally but does nothing for the state charge. Accordingly, the New York slice is taxed twice with no mechanism for relief.
Stock Options and Restricted Stock Are Treated Differently
New York allocates option income over the period from grant to vest, and restricted stock over the period from grant to the removal of restrictions. Specifically, the measurement window differs by instrument, which changes the New York fraction materially. Thus, an executive who relocated shortly after a grant may face a much smaller allocation than payroll assumes, provided the workday evidence exists.
How New York Statutory Residence Cases Actually Begin
New York runs one of the most active residency audit programmes of any American state, and London-based filers are not obscure to it. Understanding the triggers helps you avoid becoming a case in the first place.
How the State Finds You
The Department cross-matches a great deal of data. A change of address on a federal return, a W-2 showing New York withholding alongside a foreign address, a prior-year resident filing followed by silence, and property records showing continued ownership all generate enquiries. Furthermore, filing a nonresident Form IT-203 immediately after several resident years is itself a common trigger.
Notably, a domiciliary who simply stops filing attracts more attention than one who files and claims the safe harbour. Because no return means no assessment period ever starts, New York can raise the years indefinitely. Therefore, silence is the most expensive option available.
What Auditors Ask For
Residency examinations are evidence-heavy rather than legal arguments. Auditors request passport pages, airline records, mobile phone bills, credit and debit card activity, building access logs, and often the diary of a personal assistant. Additionally, they compare your claimed pattern against telephone location data, which rarely flatters a reconstructed calendar.
Given that burden, contemporaneous records are the only reliable defence against a New York statutory residence assessment. We ask clients to log every New York day on the day it happens, with the flight or ticket reference attached, from the moment a secondment begins.
The Cost of Getting It Wrong
Beyond the tax itself, New York charges interest and may assert penalties where the position was not reasonably based. Consequently, an unsuccessful New York statutory residence argument covering three open years can produce a six-figure settlement for a senior banker. Planning the day count costs a fraction of defending it, which is why we treat this as a pre-departure exercise rather than a filing-season one.
A Worked Case Study: Six Days That Cost $41,000
Consider a client profile we see repeatedly. Marcus is a US citizen, domiciled in New York and resident in Manhattan, who transferred to his bank's London office in January 2026. He kept his Upper East Side apartment, and his salary and bonus for the year totalled £420,000.
Converted at the Treasury's 2025 year-end rate of £0.743 to the dollar, that is $565,275. His UK tax at the additional rate of 45% came to roughly £177,000, or $238,200. Federally, the exclusion and the foreign tax credit between them reduced his US liability to almost nothing.
Marcus intended to rely on the 548-day rule to escape New York statutory residence. However, he returned to New York for board meetings, two family events and a fortnight at Christmas, reaching 96 days. Consequently, he breached the 90-day cap by six days and lost the safe harbour entirely for the whole period.
New York therefore taxed him as a resident domiciliary on worldwide income. After the exclusion and housing amount, his New York base stood at roughly $392,500. State tax came to about $26,400, and New York City added approximately $15,200, giving $41,600. Meanwhile, his $238,200 of UK tax generated no credit at all.
Had he stopped at 90 days, the safe harbour would have applied and New York would have taxed only genuinely New York-source income, which was negligible. Ultimately, six days of presence cost roughly $41,600, or about $6,900 per day. That is the true price of New York statutory residence for a London banker, and it is entirely avoidable with planning.
Practical Steps Before and During a London Secondment
Planning beats litigation on New York statutory residence, and the decisive moves happen before departure rather than afterwards.
Decide Between Domicile Change and the Safe Harbour
Changing domicile and relying on the 548-day rule are different strategies with different evidence requirements. A genuine domicile change requires severing ties: selling or genuinely letting the New York home, moving family and possessions, changing voter registration, and building a life in England. Alternatively, the safe harbour permits you to retain domicile while counting days rigorously.
Notably, the two approaches can conflict. Retaining the Manhattan apartment supports continued domicile, which then makes the day count decisive. Therefore, choose one strategy deliberately and document it consistently.
Deal With the Apartment Properly
If you intend to argue against New York statutory residence, the apartment is the pivot. Selling it is cleanest. Letting it on a genuine market lease for more than ten months is next best, provided you retain no right of occupation. Conversely, leaving it empty and available is the worst of all worlds, because it preserves both the domicile evidence and the permanent place of abode.
Coordinate the UK Side From Day One
Your UK position must be planned in parallel. Statutory residence in Britain, split-year treatment, and the timing of bonus payments all interact with the New York exposure. Furthermore, HMRC and New York work to different tax years, so a bonus paid in March can land in different periods on each side and distort the comparison badly.
File Even When You Owe Nothing
A New York domiciliary who is required to file federally must file a New York return, even where the exclusion removes all the income. Consequently, skipping the state return because no tax is due starts an unlimited assessment period. The nonresident and part-year guidance and the Form IT-203 instructions set out which return applies, and current rates appear in the state tax tables.
How TaxYork Can Help With New York Statutory Residence
We model the state position alongside the federal and UK returns rather than treating it as an afterthought. Specifically, we run the day count, test the 548-day rule including the spouse and short-period conditions, and quantify the cost of each additional New York trip before you take it.
Furthermore, our US tax returns for expats team prepares federal and state filings together, so the exclusion, the credit and the New York base are computed consistently. Where an assessment has already arrived, we build the permanent place of abode defence and assemble the day-count evidence.
Additionally, our tax treaty optimisation specialists ensure the federal position is fully efficient, since treaty relief cannot help at state level and every dollar must therefore be recovered federally. Where returns or FBAR and FATCA reports are outstanding, our IRS Streamlined Filing team brings you current first.
Conclusion
New York statutory residence is the most expensive state tax exposure an American in Britain can carry, precisely because New York offers no credit for UK tax and no treaty protection. A London salary already taxed at 45% can face a further 14.776% in combined state and city tax, with no relief on either side of the Atlantic.
The escape routes exist, yet they are narrow and mechanical. Count your days from the first day of the secondment, watch the 90-day cap for your spouse and children, and deal with the New York apartment decisively. Above all, plan the position before you fly, because New York statutory residence is far cheaper to avoid than to argue.
Contact Us
If you are moving to London from New York, or you already live in Britain and hold a New York apartment, we can quantify your exposure and set the day-count strategy. Our team prepares US, state and UK returns for bankers, fund principals and business owners across the country. To discuss your position, book a consultation. Email hello@taxyork.com or call 020 3488 8606.
Disclaimer
This article provides general information about United States, New York State and United Kingdom tax rules and does not constitute tax advice for any particular person. Tax rates, thresholds and exchange rates change frequently, and the figures in the case study are illustrative only. Residency determinations depend heavily on individual facts. You should obtain professional advice tailored to your circumstances before acting. TaxYork accepts no liability for action taken or omitted in reliance on this article.