Absences: the 450-day and 90-day rules explained

How the Home Office counts time outside the UK for naturalisation, the limits on each route, and when caseworkers can use discretion, based on Guide AN (July 2026).

Checked against UK Visas and Immigration (Home Office) · Oct 20263 min read

The normal limits

For naturalisation you must not have spent too much time outside the UK during your qualifying period:

Standard route (5 years): no more than 450 days outside the UK in the 5 years before the Home Office receives your application, and no more than 90 days in the last 12 months.
Spouse or civil partner of a British citizen (3 years): no more than 270 days in the 3 years, and no more than 90 days in the last 12 months.

There is a separate rule about the first day: you must have been physically in the UK exactly 5 years (or 3 years) before the Home Office receives your application.

How days are counted

Count back from the date the Home Office receives your application. An online application is received on the same day you submit it.
Guide AN says only whole days' absence count. The days you leave and arrive back in the UK are not counted as absences. For example, leaving on 22 September and coming back on 23 September does not count as an absence.
Add up every trip, including short holidays and business trips.

Keep your own records, such as passport stamps, boarding passes, booking emails and work travel records. Your application asks about your absences, and inaccurate answers can raise questions about honesty, which is part of the good character requirement.

Discretion over the whole qualifying period

Guide AN explains when caseworkers may disregard absences above the normal limit:

5-year route: absences up to 480 days are normally disregarded. Up to 900 days may be disregarded only if you meet all the other requirements and have established your home, family and a substantial part of your estate in the UK.
3-year route: absences up to 300 days are normally disregarded, and up to 540 days on the same conditions.

For larger excesses, Guide AN also expects a longer recent residence. On the 5-year route, if your absences are up to 730 days it expects you to have lived in the UK for the last 7 years, and above 730 days for the last 8 years. On the 3-year route the figures are 4 years (absences up to 450 days) and 5 years (above 450 days). This does not apply if the absences were for one of the reasons listed below.

Guide AN says absences above 900 days (540 days on the 3-year route) would be disregarded only very rarely.

Discretion over the last 12 months

For the final 12 months, the normal limit on both routes is 90 days:

Up to 100 days is normally disregarded.
101 to 179 days may be disregarded if you meet all other requirements and have shown your links with the UK through family, a home and a substantial part of your estate. It may also be disregarded where the other requirements are not all met, if those links are shown and the absence was because of Crown service or compelling occupational or compassionate reasons.
Absences over 180 days in the final 12 months are disregarded only in the most exceptional circumstances.

Reasons that can justify excess absences

Guide AN asks you to explain if your absences were the result of:

a posting abroad in Crown service or designated service
an unavoidable consequence of the nature of your work, for example a career that requires regular travel from a UK base
exceptional or compelling occupational or compassionate reasons, such as caring for a seriously ill relative
being unable to return to the UK because of a global pandemic

Give evidence, such as letters from employers or medical records. Discretion is not guaranteed, and the fee is not normally refunded if the application is refused.

If you are over the limit

Often the simplest solution is to wait. Because the qualifying period is counted back from the application date, older trips eventually fall outside the window.
Do not travel for long periods while you wait for a decision if you can avoid it. Guide AN says an intention to spend a continuous period of more than 6 months abroad will usually lead to refusal on the standard route, with limited exceptions.
Remember the separate settlement rule: GOV.UK says ILR can be lost after more than 2 years outside the UK (5 years for EU settled status, 4 years for Swiss citizens and their family members).

This guide is general information, not legal advice. If your absences are well above the limits, speak to a regulated immigration adviser before you pay the fee.

Not legal advice. This guide is general information compiled from official sources. Rules change — confirm your own situation with UK Visas and Immigration (Home Office).

Sources