How do UK absence limits differ for ILR and citizenship?

Key parameters
ILR limit	180 days in any rolling 12 months
Citizenship limit	450 days across 5 years
Spouse route	270 days across 3 years
Final-year cap	90 days in the last 12 months

This is where most miscounts come from.

ILR uses a rolling window. The question is asked continuously: at any point during your qualifying route, did the previous 12 months contain more than 180 days of absence? A single bad year breaks continuous residence and resets the clock, even if your average across five years is comfortable.

That rolling test comes from Appendix Continuous Residence, which applies to a defined list of routes. Others count differently — the EU Settlement Scheme uses 6 months in any 12, and long-residence applicants are tested against the older 548-day total and 184-day single-absence limits for any part of the period before 11 April 2024.

Citizenship uses a total plus a final-year cap. Across the whole five-year period you may be absent up to 450 days, and separately no more than 90 days in the last 12 months before applying. There is no rolling test in between — a year with 200 days abroad is not fatal on its own, provided the total holds and the final year is clean.

So the two rules fail in opposite ways. ILR punishes a concentrated absence; citizenship punishes a large total, and separately punishes a late one.

One thing they share, and it is the opposite of the tax convention. Both count whole days outside the UK, so your day of departure and your day of return generally count as days present, not days away.

Anyone applying tax-residency habits here will overcount their absences — for tax the UK counts nights by midnight presence, which is a third rule again. The same trip can produce three different numbers depending on which question you are answering.

The 90-day cap on the year before applying catches people who are otherwise well inside their totals, because it applies at the moment you are most likely to relax. Five years of careful counting, then a long trip while waiting to become eligible, and the application fails on a limit that only appeared at the end.

It also interacts badly with timing. Delaying an application moves the qualifying window forward, which changes both the five-year total and which 12 months count as "final". A delay can fix a problem or create one, and the only way to know is to recount for the new date.

Naturalisation adds two conditions no day total protects you from. You must have been physically present in the UK on the day exactly five years — or three, on the spouse route — before the Home Office receives your application. And on the five-year route you must have held ILR for at least 12 months before applying.

Both are single-date tests. Someone comfortably inside every absence limit can still fail on having been abroad on one particular day.

• GOV.UK — Immigration Rules, Appendix Continuous Residence
• GOV.UK — Apply for citizenship if you have indefinite leave to remain or settled status
• GOV.UK — Indefinite leave to remain