How the FIG regime works
You qualify if you become UK tax resident after at least 10 consecutive tax years of non-UK residence, judged year by year under the Statutory Residence Test. The relief then runs for a maximum of 4 consecutive tax years from your first year of residence: the window is fixed, it does not pause or extend, and unused years are lost. The claim is made each year on the SA109 residence pages of your Self Assessment return (box 28 for foreign income, box 29 for foreign gains), with the relieved amounts reported source by source on the supplementary pages (SA106 for foreign investment income, SA108 for gains).
The common trap: what a claim costs you
Claiming for a year forfeits your £12,570 Personal Allowance and your £3,000 Capital Gains Tax annual exempt amount in full, even if you claim on income only or gains only. If your foreign income is small, the tax saved can be far less than the value of the allowances given up, so claiming can leave you worse off. Because the claim is annual and optional, the right answer can change from year to year. Foreign employment income is not covered by the FIG claim itself; it is relieved separately through an Overseas Workday Relief election.
What to do before claiming
First confirm eligibility: a single year of accidental UK residence in the 10-year lookback breaks the test, so check each prior year under the Statutory Residence Test. Then model the numbers both ways before filing, weighing the tax saved on your sheltered foreign income and gains against the allowances you give up. Our full guide to the 4-year FIG regime covers the transitional rule for people who arrived before 6 April 2025 and worked examples of when a claim pays.
