Last week, a reader came to me with an Excel sheet she made and asked me: She calculated all night long and added up the number of days she spent each time she returned to China to visit relatives in the past five years. "The total is 210 days, which is more than 180. Was it five years of waiting in vain?" I took a look at her sheet and breathed a sigh of relief - she added up the total number of days she spent abroad to in one go. This is not an algorithm for permanent residence (ILR) continuous residence. 🧭
Continuous residence is the hard threshold for most permanent residence paths. It is also the most misunderstood and the most likely to scare people out of anxiety. Today, we will use the current rules of GOV.UK to explain "how to count" thoroughly.
The core red line for continuous residence in the UK: 180 days
Give the conclusion first. Applicable to the paths of Appendix Continuous Residence (Skilled Worker, Global Talent, Innovator Founder, UK Ancestry, Scale-up, BN(O), 10-year Long Residence, etc.), the core requirement is one sentence:
You must not be outside the UK for more than 180 days in any rolling 12-month period in the qualification period.
Pay attention to the two words in this sentence: any , rolling 12 months . It's not "180 days in five years" or "180 days in each calendar year." This is where the reader made a miscalculation - she added up the total number of days she spent abroad in the past five years, which naturally frightened herself.
How exactly does the "rolling 12-month" permanent residence process roll out?
Imagine a 12-month "window" that starts on the first day of your eligibility period and slides back one day along the timeline. Every time you slide to a position, look back at the 12 months and add up the number of outbound days in the window - as long as the total of in any position of exceeds 180 days, the continuous residence will be interrupted.
For example: You return to your country to take care of your family for 100 days in March 2024, and travel for 90 days in October 2024 for work. It's not even exceeded when viewed separately, but when put into the 12-month window of "March 2024 to March 2025", the total is 190 days - which is exceeded. Conversely, it's safe if there's enough time between two long vacations that it doesn't exceed 180 in any 12-month window.
Key action: Do not calculate by "calendar year" or "visa year". Instead, use each long-distance trip as the center of the circle and check the accumulation within 12 months before and after it. Two long-distance trips that are too closely spaced are the most dangerous.
Manual sliding windows are prone to leaks, which is why tools such as "永居计算器" exist - fill in each entry and exit date, and it will automatically help you run through all rolling windows, making precise calculations to the sky, which is much more reliable than Excel.
How to count the number of days of permanent residence abroad? Which days are considered departures?
This is the most confusing part of the version circulating online. Many old guides say that "the day of departure and the day of return are both considered departures", which causes people to count two extra days for each trip, and the more they calculate, the more panicked they become.
According to the Continuous Residence guidelines updated by Home Office in June 2026, the current caliber is: when calculating, only counts a complete day , and partial days with less than 24 hours are not counted. In other words, the day you depart and the day you return are usually considered "one day in the UK" because you are not overseas for a full 24 hours that day.
However, a word of warning: the rules will be fine-tuned according to the version of the guidelines, and the case officer has room for interpretation on the handling of the border day. If your number of days is very close to the 180 line, the safest way is to count to in a more conservative way (including departure and return days) to leave yourself a buffer instead of gambling on 179 days.
Will permanent residence be terminated if I leave the country for more than 180 days?
uncertain. The rules themselves leave a loophole: if the excess is due to serious or compelling reasons (serious or compelling reasons), it does not need to be regarded as an interruption, but you have to provide evidence. Situations specifically enumerated by GOV.UK include:
• Participation in domestic or international humanitarian relief work;
• Travel interruption caused by natural disasters, epidemics, etc.;
• Major personal changes (to myself or close relatives) such as life-threatening serious illness.
Note that usually does not count as compelling reasons such as "work requires a long-term overseas assignment", "want to spend more time with my family", "air tickets are too expensive and I can't come back". If you want to invoke this article, you must prepare hard materials such as hospital certificates, employer letters, and disaster announcements, rather than an explanation.
Differences in permanent residence and continuous residence for different visas
The same is 180 days, but the length of the qualification period for each road is different:
• Skilled Worker, BN(O), etc. : qualification period is 5 years;
• Global Talent, Innovator Founder: can apply for permanent residence in 3 years at the earliest;
• 10 years Long Residence: continuous legal residence for 10 years.
There is also a transition rule worth noting in the 10-year path: for old outbound trips starting in before April 11, 2024, they will be measured according to the old caliber (a total of no more than 548 days, a single trip will not exceed 184 days); only outbound trips starting on or after April 11 will be subject to the new rolling 180-day rule. Applicants who cross this node may have to be calculated by both sets of algorithms.
There is another category that needs to be mentioned separately: friends who take the Appendix FM spouse/partner 5-year path. Historically, there is no clear "180-day hard limit". The focus is on the true existence of the relationship and the intention of both parties to live together for a long time. However, as the rules of each path gradually move closer to Appendix Continuous Residence, the boundaries are changing. The details are subject to the Immigration Rules corresponding to your visa category.
What else is changing about UK permanent residence in 2026?
There are two things that need to be kept in mind, but neither of them changes the 180-day continuous residence rule that talked about today:
First, the rule amendment (HC 1691) submitted on March 5, 2026 plans to increase the English standard for permanent residence from B1 to B2, which is expected to take effect from March 26, 2027 - this changes the language (KoLL) requirement, not the number of days abroad. Second, the May 2025 immigration white paper proposed extending the standard permanent residence qualification period from 5 years to 10 years, and the relevant public consultation ended in early 2026. As of today (July 14, 2026), the extension has not yet been implemented, and the 5-year path is still valid.
One sentence to remember: continuous residence is based on "any rolling 12-month period of departure ≤ 180 days", not the sum of five years; if you are close to the red line, count conservatively; if it exceeds the line, you must have all the evidence for compelling reasons.
This article is for reference only. The details of the rules are subject to the latest announcement of GOV.UK. Please consult a licensed attorney for specific cases.
Let’s talk about your days abroad in the comment area
Before you applied for permanent residence, how many days was the longest time you were out of the country? Is there any holiday period that scares you? 👇 Tell us about your situation in the comment area, or you can post the difficulty of the algorithm where you are stuck. I will pick typical ones and analyze them together. I think this article explains the "rolling 12 months" clearly, so I will and collect it . Next time I book a flight or make plans to return to my country, I will read it out and read it over. Don't let the five years be cleared in the last step.
[Data source] GOV.UK:
1. Immigration Rules Appendix Continuous Residence (gov.uk/guidance/immigration-rules/immigration-rules-appendix-continuous-residence)
2. Continuous residence guidance (Home Office, updated on 2026-06-05)
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