How to calculate 180 days of permanent residence in the UK? Rolling December window + actuarial calculation + 3 high-incidence traps
Last week, a reader sent a screenshot of a flight ticket in the backend, and said in a very urgent tone: "My 5-year Skilled Worker visa will expire next month. I looked back and counted the days I spent abroad. Last year, I returned to China for funerals and family visits, a total of 185 days - have I waited in vain for these 5 years?"
This question is the one with the largest number of comments in the background. Most people think that everything will be fine if "the total of five years does not exceed 900 days". However, when they submit their application for permanent residence, they discover that the actuarial logic of rolling 12 months is completely different from what you thought. Today I’m going to break down this algorithm to the extreme and attach the three most common minefield scenarios.
1. The true meaning of the 180-day rule for permanent residence in the UK
According to the current guidelines of GOV.UK's "Continuous Residence" (Home Office updated version in July 2025), the rules applicable to most work visas to ILR are:
During the entire qualifying period before applying for permanent residence, and in any rolling 12-month window in , the total number of days spent abroad must not exceed 180 days.
Pay attention to the three keywords: any , rolling , 12 months . This means that it is not sliced by the visa issuance date, nor by the natural year (January to December), but by pushing forward 365 days from any day in the 5 years, the number of days to leave the country must be re-checked. Home Office case workers use the same set of logic - they will run through your entry and exit stamps one by one.
Scope of application of the rules: Leaves granted since January 11, 2018, and all outbound departures after April 11, 2024, will all be included in the rolling 12-month caliber. The details of paths such as BN(O), spouse visa, and Global Talent are slightly different, but the core number of 180 days/rolling 12 months is basically the same.
2. 3-step operation to calculate the number of days to leave the country for ILR
Step 1: List all entry and exit dates. pulled out all passport stamps, boarding pass emails, and bank card and airport consumption records in the past five years. There is no BRP entry and exit stamp in the eVisa era. It is recommended to directly log in to the UKVI account to export travel history, or apply for a Subject Access Request from Border Force to get official records.
Step 2: Find out which days count as "departure days". GOV.UK The guidance clearly states: "only include whole days" - only whole days that are not in the UK are counted. For example: I flew back to China in the afternoon of January 1st and returned to Heathrow in the evening of January 10th. Then because I was in the UK (even for only a few hours) on January 1st and January 10th, will not be counted as departure days. What is really counted is January 2nd to January 9th, a total of 8 days. This detail can help many people save 4-6 days of "safety cushion".
Step 3: Run the rolling window. starts from the first day of your qualifying period, looks forward 365 days every day, and adds up the total number of days out of the country. The most stable way is to use Excel to separate each date into a row, mark outbound/in the UK, and then use the SUM formula to create a rolling 365 day window. Of course, 永居计算器APP can calculate to with one click, saving you the trouble of checking one by one - especially for people who have made more than 10 short-term errors within 5 years, it is very easy to make mistakes by hand.
3. The 3 most common traps when applying for a British visa abroad
Trap 1: Understand "window" as a natural year. Someone in traveled abroad for 170 consecutive days from January to June last year, and another 150 days from February to August this year - thinking that New Year's Eve would not affect each other. wrong. Counting 365 days forward from February this year, you can also circle the departures after February last year. The two paragraphs will be combined to calculate , which will directly explode the list.
Trap 2: Forgetting that the period from visa issuance to first entry counts. Many people applied for visas in 2020 and landed in the UK in 2021 - the waiting period abroad in the middle is also included in the number of days outside the country in rolling December . The Home Office guidance specifically emphasizes: "Any absences between the date of issue and entry to the UK count towards the 180 days".
Trap 3: Telecommuting is considered "in the UK" by default. Many people in were allowed to work remotely in China during or after the epidemic. Their wages were issued, tax certificates were paid, and the HR system showed UK positions - but their passport stamps showed that they were in China. Permanent residence review is based on physical location, salary and contract address cannot save you.
4. Remedy channels for permanent residence abroad for more than 180 days
Exceeding 180 days does not mean that there is no chance at all. Home Office reserves the right of discretion for serious or compelling reasons (serious or compelling reasons) - serious illness/death of an immediate family member, major personal medical treatment, natural disaster evacuation, forced overseas deployment of the company, etc. It is still possible to be approved if hospital certificates, death certificates, employer letters, and ticket records are provided.
Note : Travel, family visits, personal affairs, business inspections - these are not compelling. The criterion is "whether it is avoidable". If you really step on the line, it is recommended to consult a licensed lawyer to evaluate the strength of the evidence and postpone the submission of the application if necessary. The current ILR application fee has risen to £3,226/person (effective from April 8, 2026), expedited Priority £3,726, Super Priority £4,226, and the cost of being rejected is not small.
📌 This article is for reference only. Please consult a licensed immigration attorney for specific cases. Data source: GOV.UK "Continuous Residence Guidance" July 2025 edition, Immigration Rules Appendix Continuous Residence.
💬Write it at the end
Let’s chat in the comment area: How long was your longest overseas trip in the past 12 months? Is it a work assignment or returning home to spend time with my family? If you are not sure about your rolling window data, you can use 永居计算器APP to calculate it to the sky. You are also welcome to describe the scene in the comment area and we will help you disassemble it.
If you find it useful, please forward it to your friends who are also applying for permanent residence in the UK. - It is better for you to know these three traps in advance than to wait until a week before submission to find out that a few days have been omitted.