2026-02-25 · 6 min read
The 180-Day Rule: Why We Built a Better ILR Tracker (Independent Guide)
Most people think the 180-day absence limit resets every January. It doesn't. Here's how the rolling window works and why it catches more people than it should.
The rule sounds simple. You cannot spend more than 180 days outside the UK in any 12-month period during your qualifying residency (official UKVI guidance). Most people who have heard of it think they understand it.
Most people are wrong.
Not because they misremember the number. Because of the word any.
The rule is not a calendar year. It is a rolling window.
The UKVI requirement is not "no more than 180 days absent in a calendar year." It is "no more than 180 days absent in any continuous 12-month period." Those two sentences mean very different things.
Here is the difference in practice.
Imagine you took two trips this year. Three months in the spring — 92 days — and three months in the autumn — 91 days. That is 183 days total. But across January to December, each half sits in a separate chunk. You might glance at a spreadsheet, see 92 days in one column and 91 in another, and conclude you are fine.
You are not.
A rolling window does not care about calendar years. It looks at every possible consecutive 365-day stretch: November to October, March to February, any 365 days it can construct. In this example, a window from July to the following June captures both trips — 183 days. Your continuous residence has broken.
Visual — rolling window
The same trips. Two very different totals.
Calendar year check — how most people think
Year 1 (Jan–Dec)
Year 2 (Jan–Dec)
Both years under 180 days. Looks compliant.
Rolling window check — what UKVI actually does
24-month view — window slides to capture Jul Year 1 → Jun Year 2
91 + 92 = 183 days in this window. Continuous residence is broken.
useimmi.comWhat "continuous residence" actually means
This is the part that catches people most off guard. Exceeding 180 days in a rolling window does not reduce your remaining allowance or add a penalty. It breaks continuous residence entirely.
When continuous residence breaks, the five-year qualifying clock does not pause. It resets. Your new ILR eligibility date is calculated from the day you returned to the UK after the violation.
Example: You broke continuous residence in June 2024 and returned in July 2024. Your new qualifying period starts in July 2024. Your ILR eligibility date becomes July 2029, regardless of how long you had been in the UK before.
Visual — clock reset
One violation. The entire clock resets.
No violation
ILR eligible: 2025
Violation Jun 2024
Clock resets. 4 years of qualifying residency lost.
New clock from Jul 2024
ILR eligible: July 2029 — 4 years later than expected
Note: the new qualifying period starts from the date you returned to the UK after the violation, not from the violation date.
useimmi.comThis is why the stakes are not administrative. A single absence violation can add years to your settlement timeline.
Why spreadsheets fail this
Spreadsheets are good at counting. They are bad at asking: "what is the worst-case rolling window across my entire travel history?"
To check compliance properly, you need to test every possible 365-day window across your full residency. If you have been in the UK for three years, that is over a thousand windows to check. Doing this in a spreadsheet is not realistic. Most people do not try. They check the current calendar year and assume the rest is fine.
That assumption is the source of most absence violations.
There is also a second failure mode. Spreadsheets track trips. They do not track rolling totals, and they do not alert you when a planned trip would push a window over the limit before you book it.
What we built
Immi does the rolling window calculation automatically.
Every time you add a trip, Immi recalculates your rolling 180-day totals across every window in your residency history. If any window goes above 180 days, you see it immediately — not in a letter from the Home Office two years later.
Not sure where you stand right now? Try the free ILR eligibility calculator →
If you want to track your absences properly across your full residency, Immi is free to start.
This guide is for general information only. It is not legal advice. Rules may change. For advice specific to your situation, consult a qualified immigration solicitor.
Try Immi
See where you stand.
The free ILR calculator gives you an instant eligibility date. Immi tracks your rolling absences so you always know exactly where you stand.