Reporting Foreign Income in the UK: 2026/27 Tax Guide

Reporting foreign income accurately has never been more critical following the most significant overhaul of UK international tax in decades. Effective 6 April 2025, the UK government definitively abolished the domicile-based remittance system, replacing it with a residence-based tax regime.  For the 2026/27 tax year, advisors and taxpayers face entirely new reporting mechanics within the Self Assessment framework, particularly concerning the Foreign Income and Gains (FIG) regime and transitional repatriation facilities.

The 4-Year FIG Regime: Claiming Relief

For qualifying new residents, the Finance Act 2025 inserted a new Chapter 5 into Part 8 of the Income Tax (Trading and Other Income) Act 2005 (ITTOIA 2005).  This establishes the 4-year Foreign Income and Gains (FIG) regime, which provides 100% tax relief on foreign income for an individual’s first four years of UK residence.

To qualify for this relief under section 845B of ITTOIA 2005, the individual must be UK resident in the tax year and must not have been UK tax resident in any of the 10 consecutive tax years immediately prior to their arrival.

You must actively claim this relief by making a “foreign income claim” on your Self Assessment tax return.  The legislation sets a strict deadline: you must submit the claim before the end of the period of 12 months beginning with 31 January after the end of the relevant tax year.

“(4) A foreign income claim must be made in a return. (5) A foreign income claim in relation to a tax year must be made before the end of the period of 12 months beginning with 31 January after the end of that tax year.”

The Cost of Claiming: Forfeiting the Personal Allowance

Reporting foreign income under the FIG regime carries a direct cost. Section 845E of ITTOIA 2005 stipulates that if you make a foreign income claim for a tax year, you automatically forfeit your entitlement to the standard UK Personal Allowance (and the blind person’s allowance) for that year.

The Temporary Repatriation Facility (TRF)

For individuals who previously claimed the remittance basis, the government introduced a Temporary Repatriation Facility (TRF) to encourage the remittance of historic offshore wealth.

If you hold foreign income and gains that arose prior to 6 April 2025, you can “designate” these amounts and remit them to the UK at a significantly reduced flat tax rate.  For the 2026/27 tax year, the TRF rate is set at 12% (this rate rises to 15% in the 2027/28 tax year).

You must formally designate these pre-April 2025 amounts within your Self Assessment tax return.  For example, if you wish to benefit from the 12% rate in the 2026/27 tax year, you must designate the specific amount of foreign income or gains in your 2026/27 return and pay the corresponding 12% charge.  Notably, from 6 April 2025, TRF capital takes priority in mixed fund disposals, simplifying the reporting of mixed account withdrawals.

Self Assessment vs PAYE: Why You Must File

Taxpayers often mistakenly believe that HMRC can simply collect tax on their foreign income through their PAYE tax code. However, HMRC internal manuals strictly mandate that reporting foreign income generally requires you to remain within the Self Assessment system.

HMRC guidelines explicitly prevent the “auto-removal” of a taxpayer from Self Assessment if their gross foreign dividends or total untaxed foreign income exceeds £10,000.  Furthermore, HMRC instructs officers to remove any coding deductions for foreign income from a PAYE tax code, even if the individual expressly requests to have their non-PAYE income coded out.  If you receive substantial foreign income, you must file an SA106 (Foreign) schedule.

Cryptoassets: The New 2026 CARF Reporting Burden

When reporting foreign income, taxpayers dealing in digital assets face new international scrutiny. The Crypto-Asset Reporting Framework (CARF) forces crypto exchanges and service providers to begin automatically reporting user data and transaction histories to HMRC starting 1 January 2026.

While the platforms themselves must submit their first reports by 31 May 2027 (covering the 2026 calendar year), this directly impacts the individual taxpayer.  You must ensure that the foreign income and capital gains you report on your 2026/27 Self Assessment perfectly align with the data HMRC will automatically receive from your offshore and domestic crypto platforms.

Making Tax Digital (MTD) Exemptions

The rollout of Making Tax Digital (MTD) for Income Tax introduces new digital record-keeping rules for individuals earning self-employment or property income.  If you are a UK tax resident, both your UK and foreign property income count towards the qualifying income threshold for MTD.

However, HMRC offers a temporary reprieve for internationally mobile taxpayers. If you submit the SA109 supplementary page (recording non-residence or domicile claims) for your 2024/25 tax return and expect to do so for your 2026/27 tax return, HMRC explicitly exempts you from using the MTD for Income Tax service before April 2027.

Late Filing and ‘Reasonable Excuse’

Given the sheer complexity of transitioning from the remittance basis to the FIG regime, taxpayers may inadvertently miss reporting deadlines. If HMRC issues penalties for late reporting of foreign income, the tribunal applies an objective “reasonable excuse” test.

As established in TC 07942 (Gilbert), the tribunal asks what a reasonable taxpayer, in the position of the appellant and with their experience, would have done.  In highly complex transitional periods, ignorance of the law or being actively misadvised by a tax agent can constitute a reasonable excuse, provided the taxpayer’s reliance on that advice was objectively reasonable.

Consider researching the precise interaction between the Temporary Repatriation Facility (TRF) and the complex mixed fund ordering rules under section 809Q of ITA 2007 for the 2026/27 tax year.