How long does it take to transfer from permanent residence to British citizenship? Two red lines of 12 months and 90 days

Last month, a reader left a message saying that she obtained permanent residence in September 2025 and excitedly submitted her naturalization application in March 2026, but it was rejected. The reason is not that the materials are missing, but that has held permanent residence for less than 12 months. More than seventeen hundred pounds, just stuck on a date.

Permanent residence (ILR) and naturalization (Naturalization) are two independent sets of time accounts. Many people think that after obtaining permanent residence, they will automatically enter the end of the countdown. In fact, another period of time has just begun. Today I will talk about some of the most easily missed points on this journey. 🇬🇧

How long does it take to transfer from permanent residence to British citizenship? 12 months is a hard threshold

The statement of GOV.UK is very straightforward: you need to have lived in the UK for 5 years or more, and has held permanent residence/settled status for 12 months before you can submit Form AN. These 12 months are calculated from the date of permanent residence approval, not from the date of application, nor from a date on BRP or eVisa.

There is also a rule that many people have never heard of: you must prove that you were in the UK on on the day when the Home Office received the application, pushing forward a full 5 years. If you happen to be in China celebrating the New Year that day, this application will be disqualified. Some people have waited a year in vain for this - not because they don't have enough residence, but because the starting date is not in the UK, so the submission date can only be moved back.

There are three things to do before submitting: check the permanent residence approval date + 12 months; check the entry and exit records for the entire day 5 years before the submission date; and then check the following number of days of departure.

How to calculate the number of days outside the country for naturalization? 450 days and 90 days

This is the biggest difference between permanent residence and naturalization. Permanent residence looks at rolling 12 months, not exceeding 180 days , a moving window; naturalization looks at two fixed intervals:

· The total number of departures in the 5 years does not exceed 450 days
· The last 12 months before submission does not exceed 90 days

This 90 days is especially easy to overlook. I got used to the 180-day period during the permanent residence stage. After getting the permanent residence, I felt relieved. I returned to my country to take care of my parents for three or four months. When I came back, I counted - I went out for 110 days in the last year. There is obviously a lot of balance left in the 450-day column, so it still has to be pushed back. More people step on the line than expected.

The excess is not absolutely irreversible. The Ministry of the Interior has discretion over the excess, but it depends on the extent of the excess and whether the cause is uncontrollable (serious illness, bereavement, epidemic-level events). It cannot be passed by just filling in a reason. ⏳ If you can’t calculate the number of days by yourself, you can use the 永居计算器 APP to record each entry and exit and calculate the number of days.

Spouse naturalization: 3-year path can save a whole year

If your partner is a British citizen, the rules are obviously relaxed: the residence period only needs to be 3 years, the upper limit of 5 years and 450 days is changed to 3 years and 270 days (the last 12 months are also 90 days), and does not need to wait for the permanent residence to be completed for 12 months - once the permanent residence is approved in one batch, it can be submitted if other conditions are met.

The premise is that the marriage relationship still exists at the time of submission, and the other party is indeed a British citizen (not a permanent resident) during those 3 years. This path saves not just a year, but also a year of uncertainty.

If you have passed the English and Life in the UK exams for permanent residence, do you need to take them again for naturalization?

Good news: Life in the UK Test will be valid for life if you pass XX2YY XX0YY once. The scores you passed during the permanent residence period will be used directly when you naturalize without having to retake the exam. If English proficiency (B1 and above, or a recognized degree such as an English-taught degree) has been proven during the permanent residence stage, there is usually no need to provide it again.