UK Tax Planning for Returning Expats: What You Must Do Before You Land

After years — sometimes decades — abroad, many British expatriates eventually return to the UK. Whether driven by family, career, lifestyle, or retirement, the return to UK tax residency is a significant event that triggers a series of tax consequences. The critical insight is that planning must happen before you return, not after.

This guide addresses the key issues: split-year treatment, foreign income and pensions, offshore asset declarations, the residence-based Foreign Income and Gains (FIG) regime, and the optimal use of the Temporary Repatriation Facility for funds built up under the old remittance basis.

Establishing Your Departure and Return Dates

UK tax residency is determined under the Statutory Residence Test (SRT), which considers the number of days spent in the UK and a series of connecting factors. For returning expats, the precise date of becoming UK resident again matters for several reasons:

• It determines when UK income tax exposure restarts
• It affects the base cost of assets for CGT purposes (assets are treated as acquired at market value on the date of becoming UK resident)
• It starts the clock on your UK residence history, which now drives both the FIG regime for foreign income and gains and (from 6 April 2025) the residence-based test for inheritance tax

The SRT is tested on a tax-year basis (6 April to 5 April). You will typically become resident from the start of the UK tax year in which you meet the residency conditions, or from the date of your return if split-year treatment applies.

Split-Year Treatment

Split-year treatment allows the tax year in which you return to be divided into two parts: an overseas part (while you were non-resident) and a UK part (from the date you returned). Income, gains, and remittances arising in the overseas part are generally assessed on a non-resident basis.

Split-year treatment is available automatically where you meet the conditions — it is claimed on the self-assessment return, not by application in advance. The relevant case is Case 4 (returning to the UK after a period abroad), which applies broadly where:

• You were non-resident in the previous tax year
• You become resident in the current tax year
• You have a UK home and no overseas home at the point of return (or you have ceased to have an overseas home)

Where split-year treatment applies, CGT and income tax on overseas-source income and gains arising before the return date are generally outside UK charge.

The planning implication: if you have significant gains to crystallise on overseas assets (share disposals, property sales, investment realisations), it is generally better to do so before returning to the UK, while still non-resident and before the UK CGT clock restarts.

Capital Gains: The Re-Basing Opportunity

When you become UK resident again, your existing assets are treated as acquired at their market value on the date of return for CGT purposes. This "re-basing" provides a valuable planning opportunity:

If assets have appreciated significantly while you were non-resident, the gain up to the date of return is effectively washed out for UK CGT — only gains arising after your return date are subject to UK CGT.

Important exception — UK land and property: since April 2015, UK residential property owned by non-residents has been within UK CGT. Non-residents must report and pay CGT on UK property gains within 60 days of completion. This exposure does not disappear on return to the UK — it is carried forward into UK residency.

Temporary non-residence rules: if you were non-resident for fewer than five complete UK tax years, certain gains realised while non-resident can be "clawed back" into UK CGT charge when you return. This anti-avoidance rule targets people who leave the UK, realise large gains while abroad, and return relatively quickly. The five-year clock runs from the year of departure, not the day of departure.

Foreign Pension Income on Return

UK residents are generally taxable on worldwide income, including foreign pension income. For returning expats, this creates a planning window.

QROPS and QNUPS: if you transferred a UK pension to a Qualifying Recognised Overseas Pension Scheme (QROPS) or Qualifying Non-UK Pension Scheme (QNUPS) while overseas, the income rules depend on the jurisdiction and the specific scheme. Some overseas pensions receive better treatment under double taxation treaties; others do not.

Pre-return drawdown: where possible, crystallising pension income while non-resident (before returning to the UK) may be tax-efficient if the overseas jurisdiction taxes it at a lower rate or not at all. This is a sophisticated area requiring country-specific advice.

UK pension in drawdown: if you return to the UK and are already drawing from a UK pension, that income is taxable in the UK at marginal rates from the date of return. No additional action is required, but the tax position should be reviewed — particularly where the pension is large and combined with other income sources.

Offshore Assets: Declaration Obligations

On returning to the UK, you become fully liable for UK tax on your worldwide income and gains. If you have offshore bank accounts, investment portfolios, or other assets, you need to consider your obligations carefully.

The Worldwide Disclosure Facility (WDF): HMRC's mechanism for voluntary disclosure of offshore income and gains that were not previously declared. The WDF allows individuals to come forward, pay the tax and interest due, and face reduced penalties versus those that would apply if HMRC discovered the undisclosed income through exchange of information.

Importantly, CRS (Common Reporting Standard) and FATCA now mean that HMRC receives automatic information from financial institutions in over 100 countries about accounts held by UK tax residents. The likelihood of discovery is now high; the benefit of voluntary disclosure is meaningful.

Who needs to consider WDF? Any returning expat who:

• Has offshore accounts that earned interest or dividends while UK resident (even briefly)
• Has realised gains on overseas assets during periods of UK residency
• Has not declared overseas income correctly on prior returns

Where the disclosure relates only to the period of genuine non-residence, there is typically no UK liability — but this needs to be confirmed.

Offshore asset reporting: UK residents are required to complete the "foreign" pages of the self-assessment return, disclosing foreign income and gains. If offshore income has never been declared, the WDF is the correct route to regularise the position before HMRC enquires.

From Domicile to Residence: The Timeline You Must Know

Until 6 April 2025, UK domicile drove the taxation of foreign income and gains, with "deemed domicile" imposed after 15 years of UK residence in the previous 20. That regime has been abolished. From 6 April 2025 the non-dom and remittance-basis regime was replaced by a residence-based system: foreign income and gains are taxed by reference to how long you have been UK resident (via the FIG regime), and inheritance tax now turns on long-term UK residence (broadly, UK resident in at least 10 of the last 20 tax years) rather than domicile. Domicile as a tax concept no longer determines your income tax, CGT, or IHT exposure in the way it once did.

For returning expats, what matters now is your UK residence history, not your domicile.

Under the FIG regime (from 6 April 2025):

• New arrivals to the UK (and returning long-term non-residents) get a four-year exemption on foreign income and gains
• After the four-year window, all worldwide income and gains are taxable

For returning expats who have been non-resident for at least 10 consecutive years, the FIG regime provides a meaningful window on return. Planning should maximise the use of this window — accelerating repatriations, crystallising gains, and structuring offshore income within the four-year period.

The Remittance Basis: Final-Year Planning

Under the old non-dom regime (before April 2025), long-term UK residents who were non-UK domiciled could claim the remittance basis — paying UK tax only on overseas income and gains actually brought to the UK. This regime ended on 5 April 2025, replaced by the FIG regime.

For those who used the remittance basis and have offshore "clean capital" or "mixed fund" accounts containing overseas income and gains never brought to the UK:

• Pre-April 2025 overseas income and gains on the remittance basis are "protected" — they retain their remittance basis status and will be taxable only if remitted to the UK
• Planning around what can be remitted, and in which order, from mixed fund accounts remains important for years or decades
• The Temporary Repatriation Facility (TRF), available for the three tax years from 6 April 2025 to 5 April 2028, offers a time-limited option to designate and remit pre-April 2025 overseas income and gains at a reduced rate — 12% for designations in 2025/26 and 2026/27, rising to 15% in 2027/28 — substantially below marginal income tax and CGT rates for high earners

Practical Checklist Before Returning

1. Calculate CGT position on all non-UK assets — crystallise gains before return if advantageous and before the five-year temporary non-residence window closes
2. Review pension structures — consider drawdown timing, QROPS treatment, and any lump sum extractions
3. Audit offshore accounts — identify any undisclosed income and consider WDF disclosure
4. Understand the FIG four-year window — plan for income and gains to be accelerated or structured within this period
5. Consider TRF — if you have pre-2025 remittance basis income and gains offshore, assess the TRF before the 5 April 2028 deadline (the reduced rate rises from 12% to 15% in 2027/28)
6. Update wills and powers of attorney — returning to the UK may affect governing law and succession planning
7. File P85 reversal — notify HMRC of your return and update your self-assessment registration

How Global Investments Can Help

Returning to the UK is one of the most tax-sensitive events in an international investor's life. Global Investments advises clients at every stage of the return process — from pre-departure planning while still overseas to disclosure, FIG optimisation, and long-term UK tax planning post-return. We work alongside specialist tax counsel to ensure clients do not overlook obligations or miss planning opportunities in the transition period.

This article is for general information only and does not constitute tax advice. UK tax law is complex and changes frequently. Rules summarised here reflect the law as understood as of mid-2026 and may have changed. Always take qualified professional advice before making decisions based on this information.