The 180-Day Rule and Rolling 12-Month Window: A Guide for ILR Applicants

You have your Skilled Worker visa. You are settling into life in the UK. Then someone mentions the "180-day rule" and suddenly you are second-guessing every trip home, every holiday, every family emergency that took you outside the country. If you get this wrong, your Indefinite Leave to Remain application could be refused. That is the reality — but it is also manageable once you understand exactly how the rule works.

This guide explains the ILR 180-day rule in plain English: what counts as an absence, how the rolling 12-month window operates, transitional rules for older visas, worked examples, and what you can do to stay compliant.

The rule in plain terms

The Home Office requires that anyone applying for ILR on the Skilled Worker route must not have been outside the UK for more than 180 days in any 12-month period during the qualifying residence period.

Here is what most visa holders get wrong on their first reading.

Only whole days count. Only days where you were entirely outside the UK count toward the 180-day total. The day you leave and the day you return do not count — you were in the UK for part of each. For a detailed explanation, see our departure day explainer.

The 12-month period is rolling, not calendar. For leave granted on or after 11 January 2018, absences are assessed on a rolling basis. For every single departure date in your travel history, the Home Office opens a 365-day window starting from that date, counts all absence days within that window, and checks whether the total exceeds 180. We explain this with worked examples below.

Five years is the qualifying period. You must complete five years of continuous residence. The clock starts from the date you were granted leave, not from when you physically arrived. You can submit your ILR application up to 28 days before the end of your qualifying period.

The UK means Great Britain plus Northern Ireland — nothing else. The Channel Islands, the Isle of Man, and all British Overseas Territories are not part of the UK for immigration purposes. See our Crown Dependencies explainer for the full breakdown.

How absence days are counted

Whole days only

Only whole days spent entirely outside the UK count toward your total. Your departure day and arrival day are not counted because you were in the UK for part of each day. For the full explanation, see our departure day explainer.

The rolling 12-month window

For visas granted on or after 11 January 2018, the Home Office takes every departure date in your history, opens a 365-day window starting on that date, sums all absence days within it, and checks whether the total exceeds 180. They repeat this for every departure and record the maximum.

If any such window exceeds 180 days, your continuous qualifying period is broken and UKVI must refuse your ILR application — unless exceptional circumstances apply. For a full explanation of breach consequences, see our guide to what happens if you breach the 180-day rule.

Pre-2018 rules: consecutive fixed periods

If all your leave was granted before 11 January 2018, absences are assessed in consecutive (fixed) 12-month periods. For example, if you applied on 15 March 2019 with leave starting 15 March 2014, your absences would be counted in five fixed blocks:

• 15 March 2014 – 14 March 2015
• 15 March 2015 – 14 March 2016
• 15 March 2016 – 14 March 2017
• 15 March 2017 – 14 March 2018
• 15 March 2018 – 15 March 2019

Each block is assessed independently. You could have been away for 179 days in one block and 0 in the next, and you would still pass.

Transitional arrangements

When your leave spans the 11 January 2018 changeover, the rules apply based on when each period of leave was granted. Here is the official transitional example from GOV.UK:

• Application date: 30 June 2020
• Leave from 1 July 2015 to 28 July 2018 — granted before 11 January 2018, so absences are considered in consecutive 12-month periods ending 30 June each year
• Leave from 29 July 2018 to 30 June 2020 — granted on or after 11 January 2018, so absences are considered on a rolling basis. Absences from the earlier leave period are not included in the rolling calculation.

This split approach catches many applicants off guard. They assume one set of rules applies to the entire application. It does not.

The pre-entry period trap

The time between when your entry clearance (visa) is issued and when you actually enter the UK counts toward your 180-day allowance. If your visa was issued on 1 June but you did not arrive until 15 August, those days are assessed as part of your absence record. A long delay between visa grant and UK entry can eat into your allowance before you have even started your qualifying period.

What counts as UK presence

The UK is defined as England, Scotland, Wales, and Northern Ireland only. Crown Dependencies (Isle of Man, Jersey, Guernsey), British Overseas Territories, and offshore installations do not count as UK time. See our Crown Dependencies explainer for the full list.

Worked examples

Example 1: Moderate travel — four trips across a year

Deepa is a software engineer on the Skilled Worker route. Her trips during 2023:

Total across the calendar year: 8 + 11 + 13 + 11 = 43 whole days.

That looks comfortable — but the rolling window check is about the worst-case 365-day period, not the calendar year total:

Window starting 3 January 2023 (through 2 January 2024): All four trips fall within this window. Absences = 8 + 11 + 13 + 11 = 43 whole days

Window starting 20 April 2023 (through 19 April 2024): Trips 2, 3, and 4 are within this window. Absences = 11 + 13 + 11 = 35 whole days

Window starting 15 July 2023 (through 14 July 2024): Trips 3 and 4 are within this window. Absences = 13 + 11 = 24 whole days

Window starting 6 October 2023 (through 5 October 2024): Only Trip 4 is within this window. Absences = 11 whole days

The peak window starts on 3 January 2023 at 43 whole days — well below the 180-day limit. Deepa has 137 days of headroom.

Notice that we only checked windows starting on each departure date. A window starting between two departures cannot contain more absences than a window starting on the earlier departure. This is exactly how efficient tools like Settld scan your travel history — they evaluate every departure-triggered window rather than brute-forcing all 365 possible start dates per year.

Example 2: One long trip — squeezing the absence budget

Marcus is a project manager seconded to his company's Dubai office for several months. His 2024 trips:

Rolling windows:

Window starting 10 January 2024 (through 9 January 2025): All three trips fall within this window. Absences = 7 + 135 + 10 = 152 whole days

Window starting 1 March 2024 (through 28 February 2025): Trips 2 and 3 are within this window. Absences = 135 + 10 = 145 whole days

Window starting 5 September 2024 (through 4 September 2025): Only Trip 3 is within this window. Absences = 10 whole days

The peak window is 152 whole days, starting 10 January 2024. This is under 180, but only by 28 days. Marcus cannot take any significant additional trip that falls within the 10 January 2024 – 9 January 2025 window without risking a breach.

A single long secondment can consume nearly your entire absence budget. Even though Marcus took only three trips, the peak window ate 152 of his 180 allowed days. If he added a two-week business trip in November 2024 — still within the same window — he would reach 166 whole days. That leaves just 14 days of headroom.

This is why checking the peak window matters far more than checking your annual total.

Example 3: Transitional arrangement — split rules in one application

Amara is applying for ILR on 30 June 2020. She holds two periods of leave:

• Leave A: 1 July 2015 to 28 July 2018 (granted before 11 January 2018)
• Leave B: 29 July 2018 to 30 June 2020 (granted on or after 11 January 2018)

Leave A — consecutive periods

Because Leave A was granted before the rule change, absences during this leave are assessed in consecutive 12-month periods ending on 30 June each year:

Each period is checked independently for the 180-day limit. Say Amara's absences during Leave A were 45, 62, and 38 days respectively — all comfortably under 180.

Leave B — rolling windows

For Leave B (29 July 2018 to 30 June 2020), the rolling window applies. Her trips:

Every rolling window triggered by a departure:

Window starting 10 August 2018 (through 9 August 2019): Trips 1, 2, and 3 fall within this window. Absences = 17 + 14 + 20 = 51

Window starting 5 January 2019 (through 4 January 2020): Trips 2, 3, and 4 fall within this window. Absences = 14 + 20 + 17 = 51

Window starting 3 June 2019 (through 2 June 2020): Trips 3, 4, and 5 fall within this window. Absences = 20 + 17 + 13 = 50

Window starting 14 November 2019 (through 13 November 2020): Trips 4 and 5 fall within this window. Absences = 17 + 13 = 30

Window starting 8 March 2020 (through 7 March 2021): Only Trip 5 falls within this window. Absences = 13

The peak rolling window is 51 whole days (starting 5 January 2019). Well under 180.

The critical point: absences from Leave A do not carry over into the rolling calculation for Leave B. The two assessment methods are entirely separate. Amara passes both checks and her absence history is compliant.

How to audit your own travel history

Step 1: Gather your data

Collect every departure from and arrival to the UK during your qualifying period. For a full checklist of evidence sources, see our skilled worker visa travel guide.

Remember: trips to the Isle of Man, Jersey, or Guernsey count as absences from the UK.

Step 2: Count whole days for each trip

For every trip, count only the whole days spent entirely outside the UK. If you are unsure about exact dates, use the most conservative estimate — assume you left earlier and returned later. The Home Office will check against its own records, and underestimating your absences helps no one.

Step 3: Identify your peak rolling window

If all your leave was granted on or after 11 January 2018:

1. Sort your trips by departure date.
2. For each departure date, construct a 365-day window starting on that date.
3. Sum the whole days for every trip whose departure falls within that window.
4. The highest total is your peak window.

If the peak is 180 or above, you have a problem. If it is below 180, the difference between 180 and your peak is your safe travel allowance — the number of additional whole days you can be away without breaching the limit in any window.

Step 4: Check transitional rules if applicable

If you held leave granted before 11 January 2018, split your absences:

• Pre-2018 leave: consecutive 12-month periods ending on the anniversary of your application date
• Post-2018 leave: rolling windows

Calculate each separately. You must pass both checks.

Step 5: Factor in the 28-day early application window

You can apply for ILR up to 28 days before the end of your qualifying period. This flexibility can shift your rolling windows in your favour — sometimes by just enough.

Why most people get this wrong

The manual process above works well for three or four trips. It becomes error-prone when you have 20, 30, or 50 trips across five years. One missed boarding pass, one miscounted window, and you could be submitting an application with a hidden breach — one the Home Office will find.

Exceptional circumstances

The guidance does allow for absences exceeding 180 days to be considered if there are serious or compelling reasons, supported by evidence. However, the bar is high: serious illness, conflict, natural disaster. Employment-related absences are explicitly excluded. For the full breakdown of breach consequences and the discretion process, see our guide to what happens if you breach the 180-day rule.

A final note

The ILR 180-day rule is not designed to trap you. It is a residency requirement with clear parameters, and it can be managed with accurate tracking. The applicants who run into trouble are almost always those who did not track their absences at all, or who relied on a rough estimate.

If you are within your 180-day limit across every rolling window, you are compliant. Track your days, plan your travel, and submit your application with confidence.

The rules described in this post reflect ILR requirements for Skilled Worker visa holders under the continuous residence requirement. Individual circumstances vary. For advice on complex travel histories or ILR eligibility questions, consult a registered immigration adviser.