How many days can I spend in the UK if I was previously UK resident?

15 or fewer UK days in the tax year, the statutory threshold is 'fewer than 16'. If you spend 16 or more days in the UK and were UK resident in any of the three preceding tax years, the second automatic overseas test fails. You would then need to check the third automatic overseas test (full-time overseas work) and, if that does not apply, the automatic UK tests and potentially the sufficient ties test.

Does split year treatment count as a year of UK residency for the second automatic overseas test?

Yes. If split year treatment applied in a tax year, for example, the year you left the UK, that entire year still counts as a year of UK residency for the three-year lookback. The split year shelters your overseas income for that year, but it does not remove the year from the residency window. If 2022-23 was your departure split year, it counts as a year of UK residency for any assessment where 2022-23 falls within the preceding three years.

What happens if I spend exactly 16 days in the UK as a previous resident?

The second automatic overseas test fails, 16 days is not fewer than 16. The first automatic overseas test also does not apply, because that test requires you to have been non-resident in all three preceding years. Unless the third automatic overseas test applies (full-time work overseas), you move to the automatic UK tests. If none of those apply, the sufficient ties test determines your status based on how many UK ties you have and your total UK day count.

When does the 45-day rule apply instead of the 15-day rule?

The 45-day limit (first automatic overseas test) applies if you were not UK resident in any of the three preceding tax years. The 15-day limit (second automatic overseas test) applies if you were UK resident in one or more of those years. The two tests are mutually exclusive, your residency history in the three preceding years determines which one is relevant.

What is the statutory basis for the second automatic overseas test?

The test is explained at RFIG20120 in HMRC's Residence and FIG Regime manual. HMRC's own manual labels this the 'first' automatic overseas test in Schedule 45 to the Finance Act 2013. This site uses the alternative plain-English ordering in which the 45-day / not-previously-resident test comes first and this test, with its stricter 15-day limit, comes second.

Second Automatic Overseas Test: The 15-Day Rule for Previous UK Residents

Q: What is the second automatic overseas test?

The second automatic overseas test (RFIG20120) confirms non-residency automatically if two conditions are both met: you were UK resident in one or more of the three preceding tax years, and you spent fewer than 16 UK days (15 or fewer) in the tax year being assessed. Both conditions must be satisfied simultaneously. Note: HMRC's internal manual calls this the 'first' automatic overseas test; this article uses the plain-English ordering common to most published guidance.

Q: When does the second automatic overseas test stop applying?

Once you have been non-resident for three full consecutive tax years, no year in the three-year lookback is a year of UK residency. At that point, the first automatic overseas test (45-day rule) becomes available again. If you were last UK resident in 2022-23, from 2026-27 the three preceding years (2023-24, 2024-25, 2025-26) are all non-resident, and the stricter 15-day limit no longer applies.

Q: Can exceptional circumstances days reduce my UK count below 16?

Yes, if the circumstances genuinely qualify. Days present in the UK only because of events beyond your control, a medical emergency preventing departure, a natural disaster, or civil unrest, may be disregarded, up to a maximum of 60 days per tax year (RFIG20730). The criteria are narrow: work commitments and most transport delays do not qualify. If disregarded days bring your count to 15 or fewer, the second automatic overseas test can still apply.

If you have lived in the UK, the Statutory Residence Test applies a stricter day limit when you return to visit. The second automatic overseas test gives previous UK residents only 15 days. Spend a single day more and the test fails.

This is a much tighter limit than many people expect. The better-known 45-day rule belongs to the first automatic overseas test, which applies only to people who have not been UK resident in any of the previous three years. If you were resident in the UK at any point in that window, the 45-day rule is not available to you. The second automatic overseas test, and its 15-day limit, is what applies instead.

If you want to work through your own position, the SRT questionnaire identifies which automatic overseas test applies to your situation and gives you a clear determination in about 10 minutes.

Key points

The second automatic overseas test requires two conditions both to be met: fewer than 16 UK days (15 or fewer), and UK residency in one or more of the three preceding tax years
If you were UK resident in even one of the previous three years, the 45-day rule does not apply to you, only this 15-day test does
A split year counts as a full year of UK residency in the three-year lookback, the split does not erase the year from the window
Spending 16 days causes the test to fail and pushes you to the automatic UK tests and potentially the sufficient ties test
Once you have been non-resident for three full consecutive years, the 45-day rule becomes available again
Note on naming: HMRC's internal manual (RFIG20120) calls this the "first" automatic overseas test. Most plain-English resources, including this site, reverse the order, calling the 45-day / not-previously-resident test "first" and this test "second", following a progression from higher to lower day thresholds. Both orderings describe the same legal rule.

What the second automatic overseas test requires

The second automatic overseas test is explained at RFIG20120 in HMRC's Residence and FIG Regime manual. Two conditions must both be satisfied in the same tax year:

You were UK resident in one or more of the three preceding tax years.
You spent fewer than 16 UK days (15 or fewer) in the tax year being assessed.

A third condition exists in the statute, that you do not die in the tax year, but has no practical application in most assessments. Both active conditions must be met simultaneously. Meeting only one is not enough.

Condition 1: UK resident in one or more of the three preceding tax years

The three-year lookback covers the three tax years immediately before the year being assessed. For the 2025-26 tax year, those years are 2022-23, 2023-24, and 2024-25.

You need to have been UK resident in at least one of those years. One year is enough; you do not need to have been resident in all three, or in the year immediately before. Whether you were "resident" in a prior year is itself determined by the SRT applied to that year.

Residency from four or more years ago falls outside the window entirely. If you were last UK resident in 2020-21 and non-resident in 2021-22, 2022-23, and 2023-24, the "previously resident" condition is not met for a 2024-25 assessment. The first automatic overseas test (45-day rule) would be available instead.

Split year treatment counts:

This is the aspect of the rule that catches most people. If split year treatment applied in a tax year, for example, the year you left the UK, that entire year still counts as a year of UK residency for this lookback. The split year treatment rules reduce your taxable income for that year, but they do not remove the year from the three-year window.

If you left the UK in September 2022 and split year treatment applied to 2022-23, then 2022-23 counts as a year of UK residency. For an assessment in 2025-26, the three preceding years are 2022-23, 2023-24, and 2024-25. Because 2022-23 falls within that window and counts as a year of residency, the second automatic overseas test applies, and the 15-day limit, not the 45-day limit, is what you face.

When the second test stops applying:

Once you have been non-resident for three full consecutive years, no year within the lookback window is a year of UK residency, and the first automatic overseas test (45-day rule) becomes available again. If you were last UK resident in 2022-23, from 2026-27 onwards the three preceding years (2023-24, 2024-25, 2025-26) are all non-resident. At that point the stricter 15-day limit no longer applies.

Condition 2: Fewer than 16 UK days

The statutory threshold is "fewer than 16 days", which in practice means 15 or fewer. 15 days passes; 16 days fails. This precision matters, the difference between a clean automatic non-resident determination and a full ties-test analysis can be a single day.

Days are counted using the midnight rule (RFIG20060):

A day counts as a UK day if you are present in the UK at midnight at the end of that day
Arrival days count: if you fly into the UK on a Monday and remain there at midnight, Monday is a UK day
Departure days do not count: if you leave the UK on a Friday, Thursday night was your last UK midnight; Friday is not a UK day
Transit days do not count: arriving and departing the UK on the same calendar day without being present at midnight does not count

Days present in the UK only because of events genuinely beyond your control may be disregarded, up to a maximum of 60 days per tax year (RFIG20730). The qualifying events are narrow: a medical emergency preventing departure, a natural disaster, or civil unrest making departure unsafe. Work commitments and most transport delays will not qualify.

If you want to track your remaining UK days in real time against your threshold, the Day Budget Dashboard updates as you log visits.

First automatic overseas test vs second: which applies to you

The decisive question is your residency history in the three preceding tax years. The two day-count tests are mutually exclusive; you can only ever be in one category in any given tax year.

Your prior residency	Test available	Day limit
Not UK resident in any of the previous 3 tax years	First automatic overseas test (RFIG20100)	Fewer than 46 days
UK resident in 1 or more of the previous 3 tax years	Second automatic overseas test (RFIG20120)	Fewer than 16 days

If you meet the first row, the 45-day limit applies and a more generous result is possible. If you meet the second row, as most recent leavers will, the 15-day limit is what you face.

The first automatic overseas test (the 45-day rule) sets out the full conditions for that test, including the scenarios in which it becomes available again after a period of non-residency.

Worked example: Priya

Priya moved from London to Singapore in August 2022. Her departure year, 2022-23, was a split year; she was UK resident for the first part of the year and non-resident for the second. She was non-resident in 2023-24 and 2024-25.

In 2025-26 she visits the UK twice: a 7-day trip in July to see friends, and a 6-day trip at Christmas to visit family. Total UK days: 13.

Applying the second automatic overseas test for 2025-26:

Condition 1: UK resident in one or more of 2022-23, 2023-24, or 2024-25? Yes, Priya was UK resident in 2022-23 (the split year counts as a full year of residency). ✓
Condition 2: Fewer than 16 UK days? 13 < 16. ✓

Priya passes the second automatic overseas test. She is non-resident for 2025-26. No ties analysis is needed.

The split year note: Even though Priya was UK resident for only part of 2022-23, the whole year counts as a year of UK residency for the lookback. She cannot use the 45-day test despite having been non-resident for the majority of 2022-23 and all of 2023-24 and 2024-25.

When does the 45-day test become available for Priya? For 2026-27, the three preceding years will be 2023-24, 2024-25, and 2025-26, all non-resident. From 2026-27 onwards, Priya can use the first automatic overseas test with its 45-day limit.

Worked example: James and the 16-day trap

James left the UK in April 2023. His departure year was 2023-24, and he was UK resident in 2023-24. He was non-resident in 2024-25.

In 2025-26 he spends 10 days in the UK in August visiting his parents, then 6 additional days in November for a friend's wedding. Total UK days: 16.

Applying the second automatic overseas test for 2025-26:

Condition 1: UK resident in one or more of 2022-23, 2023-24, or 2024-25? Yes, James was UK resident in 2023-24. ✓
Condition 2: Fewer than 16 UK days? 16 is not fewer than 16. ✗

The second automatic overseas test fails.

The first automatic overseas test does not apply either, James was UK resident in 2023-24, so he cannot meet that test's "not previously resident" condition.

HMRC now works through the remaining tests in order:

First automatic UK test (183 days): 16 < 183, does not apply
Second automatic UK test (only home in UK): James no longer has a UK home available for 91 or more continuous days, does not apply
Third automatic UK test (full-time UK work): James works overseas, does not apply

James moves to the sufficient ties test. As a leaver (Table A), with 16 UK days, the threshold table shows he is non-resident if he has two or fewer ties, and UK resident if he has three or more ties.

James has a 90-day tie (he spent over 90 days in the UK in 2022-23, so one of the prior two relevant years exceeds the threshold) and an accommodation tie (his parents have a spare room he used for all 16 nights, meeting the 16-night close-relative threshold). That is two ties. With two ties and 16 days, James is non-resident under the sufficient ties test, but narrowly. A third tie would make him UK resident.

This is the nature of the 16-day trap: missing the automatic test by a single day turns a simple determination into a detailed ties analysis where borderline cases can go either way. For the ties assessment in detail, the UK ties test explained covers what each tie requires and how the day thresholds work.

What if the second automatic overseas test fails?

If the test fails, where you go next depends on why.

Failed because of day count (16 or more days) and you were previously resident. Neither AOT1 nor AOT2 applies. Check the third automatic overseas test, if you work full-time overseas, this may still confirm non-residency regardless of day count (subject to its own conditions). If the third test does not apply, work through the automatic UK tests. If none of those apply, the sufficient ties test determines your status based on your tie count and UK days.

Failed because you were not previously resident. In that case, this test was never the right one. The first automatic overseas test (45-day rule) is what applies.

How the six automatic tests fit together covers the complete sequence and the order in which HMRC works through them. If you reach the sufficient ties test, the tie count and your total UK days are the inputs. The UK ties test explained sets out the full thresholds.

Common questions

What is the second automatic overseas test?

The second automatic overseas test (RFIG20120) confirms non-residency if you were UK resident in one or more of the three preceding tax years and you spent fewer than 16 UK days in the tax year being assessed. Both conditions must be met simultaneously. If both are met, non-residency is settled and no further SRT analysis is required.

How many days can I spend in the UK if I used to live there?

15 or fewer UK days in the tax year, the statutory threshold is "fewer than 16". Days are counted using the midnight rule: a day counts if you are present in the UK at midnight. If your UK day count reaches 16 and you were previously UK resident, the second automatic overseas test fails and you need to work through the rest of the SRT. For the day-by-day picture, how many days you can spend in the UK covers the full interaction between day counts and ties.

Does split year treatment count as being UK resident for the 15-day rule?

Yes. If a tax year had split year treatment applied, for example, the year you left the UK, that entire year counts as a year of UK residency for the three-year lookback. The split year reduces your UK tax exposure for income earned in the overseas part of the year, but it does not remove the year itself from the residency window.

What happens if I spend 16 days in the UK as a previous resident?

The second automatic overseas test fails. The first automatic overseas test also does not apply, because it requires no prior UK residency in the preceding three years. Unless the third automatic overseas test applies (full-time overseas work), you will need to work through the automatic UK tests and, if none of those apply, the sufficient ties test. Whether you are ultimately resident depends on your tie count and UK days under Table A.

When does the second automatic overseas test stop applying?

Once you have been non-resident for three full consecutive tax years, no year in the three-year lookback is a year of UK residency. At that point, the first automatic overseas test (45-day rule) becomes available. If you were last UK resident in 2022-23, from 2026-27 the three preceding years are all non-resident and the stricter 15-day limit no longer applies.

Can exceptional circumstances days reduce my UK count below 16?

Yes, if the circumstances qualify. Days present in the UK only because of events genuinely beyond your control, a medical emergency, a natural disaster, or civil unrest, may be disregarded, up to a maximum of 60 days per tax year (RFIG20730). The criteria are narrow. If disregarded days bring your count to 15 or fewer, the second automatic overseas test can still apply.

The second automatic overseas test draws a sharp line for previous UK residents: 15 days or fewer in the tax year means confirmed non-residency; 16 days or more means the test fails and the result is uncertain until the remaining stages of the SRT are worked through.

If you are planning UK visits and want to check whether the second automatic overseas test applies to your situation, the SRT questionnaire identifies the relevant automatic tests in the correct order and gives you a clear determination. It is free, takes about 10 minutes, and requires no account.

This content is for informational purposes only and does not constitute tax advice. For complex situations, professional advice from a qualified tax adviser is recommended.