Rulebook / Residence & citizenship / United Kingdom
UK citizenship — absences
- Day threshold
- 450 days
- Window
- Rolling 1826 days
- Direction
- Ceiling — stay at or below
- Counts
- Days outside United Kingdom
- Authority
- UK Home Office
UK citizenship — absences caps your time outside United Kingdom at 450 days in any rolling 1826-day period. The statute attaches its consequence at 451 days or more, so 450 is the last safe count. No more than 450 days outside the UK across the five-year period, and no more than 90 in the final twelve months. Both must hold; discretion above them exists but is not a plan.
Who it applies to
This matters most if you are:
- A permanent resident who travels often and must protect the status they already hold.
- An applicant counting physical presence toward residence or a passport.
- Anyone who will have to evidence their days to an immigration authority at renewal or application.
The rule — and why it exists
Days outside the UK in five years. At most 450 days outside United Kingdom in any rolling 1826-day period — written as <=450 AWAY / 1826.
Days outside the UK in the final year. At most 90 days outside United Kingdom in any rolling 365-day period — written as <=90 AWAY / 365.
Both limits must hold at the same time; the calculator checks each.
Why it exists: residence and citizenship are granted to people who actually live in the country. Presence requirements and absence caps are how that is measured rather than asserted.
Counting the days
- On any given day, look back over the 1826 days ending on that day (that day included).
- Count every day you were physically outside United Kingdom in that span. Partial days count as full days.
- The total must stay at or below 450. Repeat for every day — there is no reset date.
- A day only stops counting once it is more than 1826 days old. Leaving and returning changes nothing.
- A day with no record might have been a qualifying day abroad, so the calculator reports unknown days separately and treats the total as a floor, never a guess.
The free calculator below counts this rule with the same engine the Dwelltime app ships.
Check it with the free tool
Examples
Example 1 — 297 days recorded abroad in the last 1826 days
Stays: United States 2026-01-01 → 2026-10-24. Checked on 2030-12-31.
Result: Days outside the UK in five years: 153 of 450 days left (297 used in United Kingdom).
Example 2 — 470 days recorded abroad in the last 1826 days
Stays: United States 2026-01-01 → 2027-04-15. Checked on 2030-12-31.
Result: Days outside the UK in five years: over the limit — 470 of 450 days, first exceeded 2027-03-27.
Exceptions & edge cases
- Absences with permission. Some regimes disregard absences approved in advance or forced by illness; record them and check the source.
- Continuity vs. totals. Some rules require both a total and no single absence over a limit; both must hold.
- Evidence. Authorities may ask for stamps, boarding passes or statements — keep the source of every day.
Common misconceptions
- "Under 450 days means I'm safe." False — other tests can apply, and the count is only one input.
- "It resets when I leave." No. Days age out one at a time, 1826 days after they happened.
- "Arrival day doesn't count." Any part of a day inside is a day inside.
Frequently asked questions
Is the 450-day count per calendar year or rolling?
Rolling 1826 days. The window rolls forward one day at a time.
Do arrival and departure days count?
Yes — any part of a day counts as a day.
Where does this rule come from?
UK Home Office: Apply for citizenship if you have indefinite leave to remain. The link is verified on every build; if it stops resolving the build fails.
This rule is tracked in 
Dwelltime
- Counts your days for this rule from the trips you record
- Shows the last safe day, or the days still needed, before you book
- Explains every counted day and every uncounted one
- Runs alongside your other visa, tax and residency rules
Sources
Related rules
- 🇬🇧UK Standard VisitorUp to 6 months per visit. There is no published annual cap, but frequent or lengthy visits invite refusal as a de facto resident.
<=180 / VISIT - 🇬🇧Avoid UK tax residencyThe 183-day automatic UK test is only one limb of the Statutory Residence Test — ties, work and homes can make you resident on far fewer days. Use the full SRT assessment, not this counter alone.
<=182 / YEAR - 🇬🇧Become UK tax residentThe 183-day automatic UK test is only one limb of the Statutory Residence Test — ties, work and homes can make you resident on far fewer days. Use the full SRT assessment, not this counter alone.
>=183 / YEAR - 🇬🇧UK settlement — absencesNo more than 180 days outside the UK in any rolling 12 months across the qualifying period.
<=180 AWAY / 365
For information only. This page is a plain-English summary of publicly available rules, not tax, legal or immigration advice. Rules change and depend on your personal circumstances — always confirm with the official source above and a qualified professional before acting.