Before arrival: the clock has not started
The four-year window is measured from your first tax year of UK residence, judged under the Statutory Residence Test, following at least 10 consecutive non-resident years. Until that first resident year happens, there is no clock to burn: someone who stays non-resident for 2026/27 and becomes resident in 2027/28 gets a window of 2027/28 to 2030/31, all four years intact and all four claimable. The only people whose windows shed years before they could use them are pre-2025/26 arrivers, because the regime only took effect on 6 April 2025 and no earlier year can ever be claimed. The dated table in our FIG deadlines guide maps every arrival year to its window and final claim date.
After arrival: the clock never pauses
Once your first resident year has happened, the window is fixed and runs whether you claim or not. GOV.UK is explicit that if you temporarily leave the UK mid-window you cannot claim for the non-resident years, and on return you can claim only for the qualifying years remaining; the four are not extended and a skipped year is simply lost. The same use-it-or-lose-it logic applies to years you spend resident but choose not to claim: there is no carry forward and no carry back. And a part year counts in full, since a year of arrival under split-year treatment is treated as a complete year of residence for the window.
What this means for timing your move
If you are weighing up a move this April against next April, the FIG arithmetic favours whichever start date best lines up the window with your income. Delaying residence keeps all four years in hand; arriving late in a tax year spends a full FIG year on a few weeks of residence; and relief follows when income arises, so foreign dividends, disposals or distributions landing after your window closes get nothing. Remember too that each claim is made year by year on the SA109 and surrenders that year's £12,570 personal allowance and £3,000 CGT exempt amount, so small claims can cost more than they save; our guide to claiming FIG on your tax return covers the mechanics. We model arrival timing and the year-by-year claim decision on a fixed fee agreed upfront, and a free 30-minute clarity call is the quickest way to see whether the modelling is worth it in your case.
