United Kingdom Citizenship (Naturalisation)

Key parameters
Limit	450 days of absence
Qualifying period	5 years
Counting	Whole days of absence
Alternative	270 days of absence / 3 years
Additional requirements	90 days of absence in the final 12 months

There are two routes, and which one you're on sets both the qualifying period and the absence limit:

• Standard route — 5 years of residence, 450 days of absence, and settled status held for at least 12 months before applying.
• Spouse or civil partner of a British citizen — 3 years of residence and 270 days of absence, with no 12-month wait after settled status, though you still need it when you apply.

Both routes then share two further conditions. Absence in the final 12 months can't exceed 90 days. And you must have been physically in the UK on the day exactly 5 years — or 3 years — before the Home Office receives your application. That last one catches people out because it isn't a limit at all, but a single fact about one date.

Residence isn't the only requirement. You also need to be of good character, pass the Life in the UK test, prove English at B1 level, and — on the 5-year route — confirm you intend to keep living in the UK.

• It isn't 90 days per year. The 450 is a single total across the whole 5 years, so it can be spent unevenly — but the separate 90-day cap on the final 12 months still has to hold whatever you did earlier.
• The two absence limits are independent. Someone comfortably under 450 across five years can still fail on 90 days in the final year, and the reverse is equally true.
• Time before settled status still counts toward the 5 years. The qualifying period is about lawful residence, not about how long you've held settlement, which is the separate 12-month condition.
• Breaching immigration conditions during the period can be fatal. Lawful residence throughout is required, so a period without valid leave undermines the application independently of your day count.

A refused application costs the fee, which is not refunded, and leaves a refusal on your immigration record that later applications are assessed against. Where the refusal is on residence grounds the practical effect is delay rather than a permanent bar — you reapply once your absences fall inside the limits — but a refusal touching good character or deception is far more serious and can block naturalisation for years. Professional advice is strongly recommended in situations like this.

Comfortably inside both limits

You've lived in the UK for six years, hold ILR granted two years ago, and your absences total around 300 days across the last five years with three weeks abroad in the final year. Both limits hold, and the 12-month settled requirement is met.

Passing on five years but failing the final year

Your total absence across five years is 380 days, well under 450. But a four-month secondment abroad in the last twelve months puts you over 90 days for the final year, so the application fails on that limit alone.

Applying on the wrong date

Your absences are all well inside the limits, but you were on holiday abroad on the day exactly five years before your planned application date. The day-one presence requirement isn't met, so the application date has to move.

• GOV.UK — Become a British citizen
• Home Office — Naturalisation as a British citizen guidance