How is the 180-day stay abroad calculated? Passport stamps, flight tickets, and eVisa records

Every time the deadline approaches, someone comes with a worn-out old passport to count the stamps. After counting, they still ask: "I didn't get a stamp that time, can I just not report it?"

My judgment is straightforward: the passport stamp is no longer sufficient for tracking the number of days you left the UK, and trying to backtrack using it is a complete waste of time. What can really save you is a daily log you start keeping from the day you arrive. The following three questions are the most frequently asked in recent years.

Would the Ministry of the Interior not be able to find it without an exit stamp on the passport?

It can be checked. Since April 8, 2015, exit checks have been restored at airports and ports in the UK, and the document information of departing passengers is reported to the Home Office by air, sea, and rail carriers before the journey. The absence of a stamp on the passport does not mean that there is no record of that trip in the system.

But this data set has had a loophole since its design, which few have noticed: the routes within the Common Travel Area (between the UK and Ireland, as well as the Isle of Man and the Channel Islands) are not subject to exit checks, and the carriers of these journeys do not need to collect passenger document data. This is clearly stated in the GOV.UK Exit checks fact sheet and in the inspection report published by the Independent Chief Inspector in 2018. In immigration rules, Ireland is considered outside the UK, so a flight to Dublin and a three-day stay still counts as a full day's absence. These short trips are precisely the ones that are most likely to disappear from your list without a trace.

Don't take "not found by the official" as "no need to report". The application form requires you to truthfully list every period of absence. If you underreport and it is discovered, it is a matter of integrity, and the consequences are much more severe than over-reporting by a few days.

The 180 days of permanent residency, which 12 months is it calculated from?

The most common way of counting is "no more than 180 days per visa year," while some people divide it by the calendar year. Absences starting after April 11, 2024, no longer apply to this method. The wording in Appendix Continuous Residence CR 2.2 is any 12 month period, and the accompanying case guidance is implemented on a rolling basis: any day can be taken as the starting point, and the 12-month period must be valid.

Take a concrete example. Return to China for 55 days in November 2025, 60 days in March 2026, and 80 days in September 2026. Looking by natural years, 55 days in 2025 and 140 days in 2026, both are safe. However, if the window is set from November 1, 2025, to October 31, 2026, the total is 195 days, which exceeds the limit by 15 days. The same vacation period may fall into several windows, which is the easiest place to make mistakes when calculating yourself.

Do a reverse calculation before booking the ticket: how many days are there in total when you go back to the UK, going back 12 months from that day.

What exactly should be kept as a voucher?

Starting from April 10, 2026, the EU EES will be fully operational, and Schengen border authorities will stop stamping passports. Plus, the UK never stamps exit entries, and those who can use eGate upon entry also don't get a stamp, so the information available on the passport line will only decrease. The GOV.UK "Guide to faster travel through the UK border" clearly states: without an entry stamp, you need to keep your ticket and boarding pass to prove your entry date. As for eVisa, the UKVI account shows your current status and validity period, not your travel records.

There are only two steps in operation. On the day of arrival, write down two lines in your phone calendar: the departure date and the return date to the UK, each with the flight number, and take a screenshot of the boarding pass and save it in the same album; do a rolling check once a year, adding up the number of days in the past 12 months. Especially for those few times when you go to Ireland by land or take the Eurostar, you need to add them yourself, no one else will do it for you. If you want to calculate each day precisely with a rolling window, you can use 永居计算器 APP, which can be accessed by clicking on the bottom menu bar of this official account; if you are unsure whether a certain period is missing, or whether an exception can be applied, you can pay £5 on justiscript.com to get a written response from a practicing British lawyer within 24 hours.

"The applicant must not have been outside the UK for more than 180 days in any 12 month period."
—— Immigration Rules, Appendix Continuous Residence CR 2.2

any 12-month period, this wording does not have a starting point, so there is no day that is naturally safe; your records must be able to withstand any window for counting.

This document is for reference only. For specific issues, please consult a licensed attorney.
[Data Source] gov.uk/guidance/immigration-rules/immigration-rules-appendix-continuous-residence; gov.uk/government/publications/exit-checks-on-passengers-leaving-the-uk/exit-checks-fact-sheet

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