Claiming to be non-UK resident is one of the most powerful positions in UK tax planning, and one of the most heavily tested by HMRC. If you have moved abroad, split your time between the UK and another country, or claimed non-residence to shelter foreign income or gains, an enquiry into your Statutory Residence Test position can unpick years of careful planning on the strength of a handful of missing boarding passes.
What the Statutory Residence Test actually tests
The Statutory Residence Test, introduced by Schedule 45 to the Finance Act 2013, replaced the old case-law-based residence rules with a single, mechanical statutory framework. It works in three stages, applied in strict order for each tax year separately: the automatic overseas tests, which can make you conclusively non-resident regardless of ties; the automatic UK tests, which can make you conclusively resident regardless of ties; and, only if neither automatic test resolves the position, the sufficient ties test, which combines your UK day count with the number of connecting factors (“ties”) you hold to the UK.
Residence is determined separately for each tax year. A person can be non-resident for several years, resident for one, and non-resident again, and each year must be tested on its own facts. This is precisely why HMRC enquiries into SRT positions are rarely confined to a single year: once an officer starts pulling travel and accommodation evidence, the natural next step is to test every year the claimed non-residence position covers.
The automatic tests: the quickest way to lose, or win, the argument
The automatic overseas tests will make you non-resident for a tax year if, broadly, you were UK resident in none of the previous three tax years and spent fewer than 46 days in the UK in the year in question; or you were UK resident in one or more of the previous three tax years and spent fewer than 16 days in the UK; or you work full-time overseas, with no significant breaks, and meet detailed day-count and UK-work-day conditions. The automatic UK tests work in the opposite direction: broadly, spending 183 days or more in the UK in the tax year, having a home in the UK that you use sufficiently and either have no overseas home or spend little time there, or working full-time in the UK.
The “full-time work abroad” automatic overseas test is the one most frequently disputed, because it depends on a precise, defined calculation, hours worked overseas averaged against a 35-hour weekly standard, no more than 90 UK workdays in the year, no more than 30 days where more than three hours' UK work is done, and, critically, no “significant break” from overseas work during the year. HMRC treats a significant break as any period of 31 or more consecutive days during which the individual does not work overseas for at least three hours on any day, and does not fall within a small set of permitted exceptions (annual leave properly taken, sick leave, parenting leave). A single unplanned 31-day gap, a redundancy notice period, an unpaid sabbatical, a delayed contract start, can retrospectively disqualify the whole year's claim to full-time overseas work, throwing the taxpayer back onto the sufficient ties test.
The sufficient ties test: where most disputes actually happen
If neither set of automatic tests applies, residence turns on the sufficient ties test: the number of UK connecting factors held, cross-referenced against a table of day thresholds that differs depending on whether the individual is an “arriver” (not UK resident in any of the previous three tax years) or a “leaver” (UK resident in one or more of the previous three tax years).
The ties are: a family tie (UK-resident spouse, civil partner or minor child); an accommodation tie (UK accommodation available to the individual and used for at least one night in the year, including a relative's home in some circumstances); a work tie (more than 40 days doing more than three hours' work in the UK); a 90-day tie (more than 90 days spent in the UK in either of the previous two tax years); and, for leavers only, a country tie (more days spent in the UK in the year than in any other single country). Leavers face a stricter day-count table than arrivers at every tie count, which is the trap that catches people who have recently left the UK and assume the generous thresholds that apply to newcomers still apply to them.
| UK ties held | Days in UK, Leaver becomes resident at | Days in UK, Arriver becomes resident at |
|---|---|---|
| 4 or more | 16 days or more | 46 days or more |
| 3 | 46 days or more | 91 days or more |
| 2 | 91 days or more | 121 days or more |
| 1 | 121 days or more | Not resident on ties alone |
| 0 | Not resident on ties alone | Not resident on ties alone |
How HMRC actually investigates an SRT position
HMRC's enquiries into claimed non-residence are forensic and evidence-heavy, because the test itself is almost entirely a question of fact: days present, ties held, hours worked. A typical enquiry letter will ask for a complete day-by-day schedule of UK and overseas presence for the years in question, supported by boarding passes, passport entry and exit stamps, travel booking confirmations, and, increasingly, secondary evidence such as mobile phone location data, credit card and bank statements showing the country of spend, and fuel or mileage records. Where full-time overseas work is claimed, HMRC will request the employment contract, payroll and timesheet records, and evidence of the UK workdays claimed to fall within the permitted limits, testing specifically for undisclosed significant breaks.
HMRC has access to Border Force and airline passenger data (Advance Passenger Information) that can be cross-referenced against a taxpayer's own day count, and discrepancies between the two are one of the most common triggers for an enquiry to widen from a single query into a full residence challenge. A day count that has not been contemporaneously recorded, and is instead reconstructed from memory once the enquiry letter arrives, is a materially weaker starting position than one supported by a diary kept at the time.
Exceptional circumstances: a narrow, heavily litigated escape route
Days spent in the UK due to circumstances genuinely beyond the individual's control, and which they could not reasonably have foreseen or planned around, may be disregarded for residence purposes, up to a maximum of 60 days in a tax year. This provision exists for cases such as sudden serious illness, natural disaster, or being unable to leave the UK for reasons wholly outside the taxpayer's control. It does not extend to circumstances the individual chose, however sympathetic, and the Upper Tribunal's decision in A Taxpayer v HMRC [2023] UKUT 182 (TCC) illustrates how narrowly HMRC and the tribunals apply it: a taxpayer who remained in the UK to care for a vulnerable relative during the Covid-19 pandemic succeeded at the First-tier Tribunal, but HMRC's appeal to the Upper Tribunal was allowed, on the basis that a moral obligation to provide care, however genuine, is not the same as being legally or medically prevented from leaving. The decision leaves considerable uncertainty in this area precisely because it turns so heavily on the specific facts of each case, and it should not be relied upon as a general safety net for days spent in the UK for family or caring reasons.
How these enquiries typically unfold
Case A: The relocation that didn't quite land
An executive relocates to Dubai with his employer partway through the tax year, intending to rely on the automatic overseas full-time work test, and files on the basis of non-residence. HMRC's enquiry uncovers a six-week gap in the middle of the year, an unpaid period between his old contract ending and the new one formally starting, that was never disclosed as a significant break. Because the gap exceeds 31 days and does not fall within a permitted exception, the full-time work abroad test fails for the whole year, and the position falls back onto the sufficient ties test. With a UK-resident spouse still living in the family home (a family tie and an accommodation tie), the taxpayer is found UK resident for the year in question, converting what had been treated as tax-free overseas earnings into a UK liability, plus interest and a behaviour-based penalty.
Case B: The day count that held up
A consultant splits her time between the UK and Portugal, deliberately keeping a contemporaneous travel log, boarding passes and a spreadsheet cross-referenced against her passport stamps from the outset, having taken advice on her tie count (two ties: a 90-day tie and an accommodation tie) and the corresponding 91-day threshold. HMRC opens an enquiry after Border Force data flags a possible discrepancy of a few days around one trip. Because the contemporaneous record is complete and internally consistent, and reconciles cleanly against the flagged data once the specific dates are checked, the enquiry closes without any change to the declared residence position within a matter of months.
Responding to an SRT enquiry
The first step is establishing, precisely, which automatic tests and which ties were relied upon for each year in question, and gathering the underlying evidence for each element before responding to HMRC rather than after. Where full-time overseas work was claimed, the permitted UK workday count and any potential significant break need checking with particular care, since this is the single most common point of failure. Where the position rests on the sufficient ties test, the tie count itself should be independently re-verified, family circumstances, accommodation arrangements and the previous two years' day counts can all shift a tie count without the taxpayer necessarily realising it.
Where the evidence supports the claimed position, the case is about presenting a complete, reconciled day count and tie analysis persuasively and early, closing down HMRC's enquiry before it widens into further years. Where the evidence is genuinely incomplete or the position was always borderline, the case shifts to limiting exposure, disputing behaviour categorisation for any penalty, checking time limits, and assessing a negotiated settlement against the cost and risk of a tribunal appeal.
Related guides in this series
- Non-resident CGT: the 60-day rule & penalties
- FIG regime compliance checks: the remittance basis replacement
- Offshore assets investigation: full guide
- The Worldwide Disclosure Facility explained
- Offshore assessment time limits (practitioner guide)
Frequently asked questions
What is the Statutory Residence Test?
The Statutory Residence Test (SRT), introduced by Finance Act 2013 Schedule 45, is the sole legal test for UK tax residence. It works in three stages: the automatic overseas tests, the automatic UK tests, and, if neither resolves the question, the sufficient ties test, combining UK day count with your connections to the UK.
How many days can I spend in the UK and remain non-resident?
It depends on how many UK ties you have and your residence history. Under the sufficient ties test the threshold ranges from under 16 days (four or more ties, resident in a previous year) up to 120 days (one tie, not resident in the previous three years). There is no single universal limit.
What counts as a UK tie?
A family tie, an accommodation tie, a work tie (40+ days), a 90-day tie (90+ days in either of the previous two years), and, for leavers, a country tie. Miscounting your ties by even one is often what turns a comfortable position into a residence enquiry.
What evidence does HMRC ask for in an SRT enquiry?
A full day-by-day presence schedule supported by boarding passes, passport stamps and travel bookings; employment contracts and payroll records for any full-time overseas work claim; and evidence of accommodation and family location. HMRC increasingly cross-references this against Border Force passenger data.