Returning to the UK in one paragraph: when you return after a period abroad, you typically become UK-resident from the date of arrival (with split-year treatment for the arrival year). From that date forward, your worldwide income and gains are UK-taxable on the arising basis. Pre-arrival planning is critical: rebasing overseas investments (selling and rebuying to lock in current values), crystallising overseas pensions, and timing the move to fall just after the start of a tax year all matter. Get the residency date wrong and the tax cost can be substantial.
When residence resumes — the SRT cases
Return-related split-year cases (a continuation from the SRT framework):
- Case 4: you start to have your only home in the UK. Split-year treatment from the date you start having your only UK home.
- Case 5: you start full-time work in the UK. Split-year treatment from the date the qualifying period of UK work starts.
- Case 6: you cease working overseas full-time. Triggers UK-resident status from the date overseas work ended.
- Case 7: your spouse ceases working overseas full-time (and you accompanied them).
- Case 8: you start to have a home in the UK (even if not your only home).
Each case has specific qualifying conditions: pre-departure status, duration of overseas absence, nature of UK work, etc. Choose the case that applies to your circumstances; some have lower thresholds than others.
The "arising basis" vs "remittance basis"
Once UK-resident, your taxation rules depend on domicile:
UK-domiciled (most returning Brits)
- Arising basis: worldwide income and gains taxable as they arise
- No election available
Non-UK-domiciled (small minority — fewer than 1% of UK residents)
- Can elect for remittance basis: only UK income and remittances to UK are taxable
- From April 2025, the long-standing non-dom remittance basis is being replaced by the "FIG" (Foreign Income and Gains) regime — 4-year exemption for new arrivals
- After 4 years (or for non-FIG-eligible residents), full arising basis applies
For UK-domiciled returnees, the question is simply when residence resumes. You can't elect remittance.
Pre-arrival planning — the rebasing question
Before becoming UK-resident, consider:
- Rebase overseas investments: sell investments at current overseas (presumably lower-tax) jurisdiction's CGT rate, then rebuy. UK CGT then runs from the new acquisition cost going forward.
- Crystallise overseas pension lump sums: tax-free in some jurisdictions, may be taxable on remittance under UK regime
- Pay overseas dividend withholding: ensure foreign tax already collected so UK gives credit later
- Sell second homes in low-tax jurisdictions: before UK CGT regime applies
- Close non-reporting offshore funds: avoid the punitive UK income-tax-on-disposal treatment
- Time the arrival: entering on 7 April (start of tax year) gives a clean split. Entering on 1 February gives a complex split-year computation
The rebasing decision depends on whether the overseas jurisdiction taxes the disposal. In jurisdictions like the UAE, Singapore, or some Caribbean territories with no CGT, the rebase is essentially free. In high-tax jurisdictions, rebasing might cost more than just waiting.
What becomes taxable from arrival
| Income/Asset | Tax position from arrival |
|---|---|
| Overseas employment | If continuing — taxable in UK on arising basis |
| Overseas dividends | Taxable in UK (with credit for foreign withholding under treaty) |
| Overseas property rental | Taxable in UK (with credit for foreign tax paid) |
| Overseas savings interest | Taxable in UK |
| Overseas capital gains | Taxable in UK from arrival date |
| Overseas pension lump sums | Generally taxable in UK if received post-arrival; treaty may override |
| Overseas pension regular payments | Treaty-dependent |
| Inheritance from abroad | UK IHT typically doesn't apply to non-UK-domiciled receipts; arising domicile depends on circumstances |
Special case: temporary non-residence
If you were UK-resident for at least 4 of the 7 years before leaving, AND you've been non-resident for fewer than 5 complete tax years when you return, the "temporary non-residence" rules apply:
- Gains realised during the non-resident period (on assets owned at time of leaving) are taxed in the UK in the year of return
- Certain income (e.g., dividends from controlled overseas companies) is also caught
- Prevents people from leaving for <5 years, realising large gains tax-free in another country, then returning
The 5-complete-tax-year threshold is important: a person who leaves on 1 May 2026 and returns before 6 April 2032 is caught by temporary non-residence rules. Stay away until at least the start of 2032/33 to escape.
Worked example: returning consultant
Mr K worked in Dubai for 6 years (2020-2026) earning tax-free in UAE. He returns to UK 7 April 2026 with:
- £250,000 in UAE bank accounts
- £500,000 in US equity portfolio (Saxo Singapore)
- £100,000 unrealised gain on those equities
- £300,000 cash in UAE
Pre-arrival planning he should consider:
- Rebase the equity portfolio: sell on 3 April 2026 (pre-UK-residence), buy back 8 April 2026. £100,000 gain crystallised tax-free (no UK CGT, no UAE CGT). UK CGT starts from the new £600,000 cost basis.
- Bring cash into UK after arrival: as he's UK-domiciled, source of cash doesn't matter — no remittance tax. But he should keep clean records to show the cash was earned during non-residency.
- Open ISA on 7 April 2026: uses full 2026/27 £20,000 ISA allowance immediately.
- Resume Class 3 voluntary NI contributions: may also be able to buy back missed years 2020-2026 within the 6-year window.
By doing this, he saves potentially £24,000 of UK CGT (24% × £100,000 gain) that would have applied if he'd held the assets unchanged through to arrival.
UK tax-free wrappers post-return
On arrival you can:
- Open a new ISA from the date of UK residence — full £20,000 annual allowance applies even if you arrived mid-year
- Re-engage with UK pension — can resume contributions, with pension carry-forward for the last 3 years subject to having been a UK scheme member
- Top up NI contributions — buy back missing years within 6-year window (sometimes longer for pre-2018 years under special extensions)
Common returning-to-UK mistakes
- Not rebasing overseas investments pre-arrival. The biggest single-decision tax saving most returnees miss.
- Bringing significant funds in just before residency starts. If you're treated as resident from a date earlier than expected, the funds may be deemed remittance.
- Forgetting temporary non-residence rules. Living abroad <5 complete tax years exposes you to UK CGT on gains during the absence.
- Not opening UK accounts before final move. Setting up accounts post-arrival is harder due to KYC checks. Arrange in advance.
- Missing the State Pension top-up window. Voluntary NI for missed years is cheap and high-return. Don't miss the 6-year window.
- Continuing overseas employer pensions without understanding UK tax treatment. Some overseas pensions are UK-taxable on lump-sum drawdown; others are tax-favoured.
- Not engaging professional advice for high-value moves. The tax saved from good planning easily covers professional fees for any return with £100,000+ of overseas assets.
Sources
Related foreign income content
How UK Tax Drag holds itself to account
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