2025 UK Remittance Basis Abolition: Impact on Japan-Resident UK Persons

Answer Snapshot

Japan residents must re-map UK FIG, SRT, and Japanese FTC before filing.

Why This Matters for UK Residents in Japan

From 6 April 2025, the UK remittance basis has been abolished. HMRC’s Residence and FIG regime guidance explains that UK residents are now taxed on the arising basis for worldwide income and gains, with the 2024-25 tax year being the final year in which the remittance basis could be claimed or applied automatically. See HMRC’s Residence, Domicile and Remittance Basis Manual on GOV.UK: https://www.gov.uk/hmrc-internal-manuals/residence-domicile-and-remittance-basis/rdrm31010.

For British individuals living in Japan, the practical issue is not only “UK tax changed.” The issue is that UK tax residence, Japanese tax residence, treaty residence, and foreign tax credit timing may now point in different directions. A person can be resident in Japan under Japanese domestic rules while still needing to analyse UK residence under the Statutory Residence Test, or SRT. In some cases, the UK-Japan tax treaty may then be needed to decide which country has treaty residence for specific treaty purposes.

A useful quote for this topic is:

Under the UK Statutory Residence Test, the priority order matters: 183 UK days overrides the rest, then automatic overseas tests are considered, and only after that do automatic UK tests and the sufficient ties test decide the result.

HMRC’s RDR3 guidance sets out this structure: if you have been in the UK for 183 or more days in the tax year, you are UK resident; if you have fewer than 183 UK days, the automatic overseas tests are considered next; if those do not apply, the automatic UK tests and sufficient ties test are considered. See HMRC RDR3: https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt/guidance-note-for-statutory-residence-test-srt-rdr3.

This order is especially important for UK residents in Japan who travel back to the UK for family, work, company director duties, rental property management, NHS/private medical appointments, or extended stays around school holidays. A casual “I live in Japan now” conclusion is not enough. The UK test is mechanical and year-by-year.

On the Japan side, the National Tax Agency explains that a person is generally a non-resident unless they have a domicile in Japan or have had a residence continuously for one year or more in Japan. See the NTA English guidance: https://www.nta.go.jp/english/taxes/individual/12006.htm. Once you are a Japanese tax resident, Japan’s scope of taxation depends on whether you are a non-permanent resident or a resident other than a non-permanent resident. This can affect how foreign-source income is reported in Japan and how remittances to Japan are analysed.

The UK reform therefore creates a double layer of analysis:

1. Does the UK tax you on the arising basis under the post-remittance-basis FIG framework?
2. Does Japan also tax the same income or gain under Japanese residence rules?
3. If both countries tax it, which country has primary taxing rights under domestic law and the UK-Japan tax treaty?
4. Can Japan-side foreign tax credit relief be claimed, and in which Japanese tax year?

This is why a UK Self Assessment answer cannot simply be copied into a Japanese final income tax return.

Key Forms and Filing Mechanics

For UK residents in Japan, the first technical step is to map the UK tax year to the Japanese calendar year. The UK tax year runs from 6 April to 5 April. The Japanese individual income tax year runs from 1 January to 31 December, with the standard Japan filing and payment period ending on 15 March of the following year.

That mismatch matters. A UK dividend, rental profit, capital gain, self-employment receipt, or employment bonus may sit in one UK tax year but a different Japanese calendar year. Foreign tax credit work often fails because the taxpayer uses the UK Self Assessment year as if Japan used the same period.

On the UK side, the following concepts and forms commonly appear:

• Statutory Residence Test, or SRT, under HMRC RDR3
• Automatic overseas tests, automatic UK tests, and sufficient ties test
• Split year treatment, where relevant
• Self Assessment tax return, commonly the SA100 main return
• SA109 residence, remittance basis and related residence pages, where required
• SA106 foreign pages, where foreign income is reportable in the UK return
• SA108 capital gains pages, where UK capital gains reporting is required
• SA105 UK property pages, where UK rental income is involved
• Personal Tax Account and HMRC online Self Assessment filing
• 31 January online Self Assessment filing and balancing payment deadline
• 31 July second payment on account deadline, where payments on account apply

Do not assume every form is required in every case. The correct UK forms depend on your UK residence result, domicile history for pre-2025 years, income categories, gains, property, and whether you are still within a transitional rule such as the Temporary Repatriation Facility, or TRF.

HMRC explains that the TRF is a temporary measure for former remittance basis users with pre-6 April 2025 foreign income and gains, available for the 2025-26, 2026-27, and 2027-28 UK tax years. See HMRC TRF guidance: https://www.gov.uk/hmrc-internal-manuals/residence-domicile-and-remittance-basis/rdrm71000.

The Japanese return then needs its own analysis. The Japan-side filing may involve:

• Japanese final income tax return for income tax and special income tax for reconstruction
• Resident status analysis under Japanese domestic law
• Non-permanent resident analysis, if the taxpayer has not yet reached the relevant long-term residence threshold
• Foreign-source income classification
• Japan-source income classification
• Foreign tax credit calculation and supporting statement
• Exchange rate conversion into Japanese yen
• Evidence of tax paid overseas
• Treaty position and supporting explanation, where treaty relief is relevant

The NTA’s English information pages are a useful starting point for individual income tax issues: https://www.nta.go.jp/english/taxes/individual/index.htm.

A common case is a British freelancer resident in Japan who has UK clients, a UK bank account, an Individual Savings Account, a UK Self-Invested Personal Pension, and a UK rental property. For UK purposes, the ISA, SIPP, UK property, and self-employment income each have their own rules. For Japanese purposes, the labels do not automatically carry over. Japan may not treat a UK tax-free wrapper as tax-free. Japan asks whether there is income or gain under Japanese tax rules.

This is the core planning point: a UK tax exemption is not automatically a Japanese tax exemption.

SRT, Japan Residence, and Treaty Residence

The SRT is a UK domestic law test. Japanese residence rules are Japanese domestic law rules. The UK-Japan tax treaty is a separate layer that may allocate taxing rights or resolve dual residence for treaty purposes.

For British residents in Japan, the SRT should usually be documented with a day-by-day travel calendar. You should retain flight records, passport entry and exit records, hotel receipts, employment calendars, board meeting minutes, and evidence of where work was physically performed.

Under RDR3, a person may be automatically non-UK resident if an automatic overseas test is met. Examples include cases involving very low UK day counts or full-time overseas work, subject to the detailed conditions. However, if the automatic overseas tests do not apply, the automatic UK tests and sufficient ties test can still bring a person into UK residence.

The sufficient ties test is especially easy to underestimate. UK ties can include family, accommodation, work, a 90-day tie, and, for leavers, a country tie. The more UK ties you have, the fewer UK days may be needed for UK residence.

For Japan, residence is not decided by the UK SRT. Japan looks at Japanese concepts such as domicile and residence. A UK person who moved to Tokyo, Osaka, Yokohama, Fukuoka, or elsewhere in Japan for work or business may become Japanese tax resident even if the UK result remains uncertain.

Where both countries treat the person as resident, the UK-Japan tax treaty may be relevant. Treaty analysis is fact-specific and can involve permanent home, centre of vital interests, habitual abode, nationality, and mutual agreement concepts depending on the provision being applied. The treaty text and official treaty information should be checked through official sources, including Japan’s Ministry of Finance treaty page: https://www.mof.go.jp/tax_policy/summary/international/tax_convention/.

Treaty residence should not be used casually. A treaty position may affect the UK return, the Japanese return, withholding tax positions, and foreign tax credit mechanics. It also needs to be consistent with the documents submitted to both authorities.

Japan-Side Impact of the UK FIG Regime

The abolition of the remittance basis changes the UK side of the calculation, but Japan does not simply follow the UK result. The Japan-side work must identify the income, source, timing, currency conversion, and creditability of foreign tax.

Important categories include:

• UK employment income while physically working in Japan or the UK
• Director fees from a UK company
• UK self-employment or sole trader income
• UK partnership allocations
• UK rental income
• UK bank interest
• UK dividends
• ISA income and gains
• SIPP or pension distributions
• Capital gains on UK shares, funds, cryptoassets, or property
• RSU, stock option, and ESPP income connected to UK or Japan workdays

For Japanese tax purposes, timing can be different from UK timing. Currency conversion also matters. Japan filings are made in Japanese yen, and records should show the exchange rate basis used for each income item, tax payment, and foreign tax credit item.

Foreign tax credit analysis is not merely “UK tax paid equals Japan credit.” Japan generally applies credit limitations, and the availability of a credit depends on the nature of the foreign tax, the income, the taxpayer’s status, and the Japanese calculation. The NTA has English guidance on foreign tax credit issues for certain taxpayers, and the official NTA site should be checked for the current forms and instructions: https://www.nta.go.jp/english/.

For British taxpayers who previously relied on the remittance basis, pre-6 April 2025 foreign income and gains may still need careful tracking. HMRC guidance states that foreign income and gains that arose before 6 April 2025 to former remittance basis users can continue to be taxed if remitted to the UK on or after that date, subject to the TRF rules. Japan-side treatment must be reviewed separately.

Common Mistakes

• Assuming an ISA protects income or gains from Japanese tax. An ISA is a UK wrapper; Japan may still look through to dividends, interest, funds, or gains under Japanese rules.

• Assuming a SIPP is automatically invisible in Japan. Pension contributions, growth, withdrawals, and treaty treatment need separate analysis.

• Treating the UK tax year as if it were the Japanese tax year. UK 2025-26 does not match Japan 2025.

• Forgetting the SRT priority order. The 183-day rule, automatic overseas tests, automatic UK tests, and sufficient ties test must be applied in the correct sequence.

• Ignoring UK workdays while visiting the UK. More than three hours of work in the UK on a day can matter for SRT analysis.

• Filing the Japanese return without waiting for final UK tax data, then failing to correct or support the foreign tax credit position.

• Claiming a foreign tax credit in Japan without evidence of the UK tax actually assessed or paid.

• Assuming the UK-Japan tax treaty eliminates all double taxation. Treaties allocate taxing rights; they do not replace the need to file correctly.

• Missing the UK Self Assessment deadline of 31 January for online filing and payment.

• Missing the Japan final income tax return deadline, generally 15 March for the previous calendar year.

FAQ

For British residents in Japan, does the UK remittance basis abolition mean Japan taxes more income automatically?

Not automatically. The UK change affects UK taxation from 6 April 2025, but Japan applies Japanese residence, source, and timing rules. The practical effect is that more items may now be taxed in the UK on the arising basis, which can change Japan-side foreign tax credit calculations and the supporting documents needed for the Japanese return.

For UK residents in Japan, can an ISA remain tax-free in Japan?

Do not assume so. An ISA is a UK tax wrapper. Japan may tax dividends, interest, distributions, or gains depending on the asset and the taxpayer’s Japanese status. A Japan-side review should examine the underlying transactions, not only the UK account label.

For British freelancers in Japan, do UK clients make the income UK-source?

Not necessarily. Source analysis can depend on where the work is performed, the type of income, contract terms, permanent establishment issues, and domestic law in each country. A freelancer physically working in Japan for UK clients may still have Japan-side reporting obligations.

For UK residents in Japan, is the SRT still relevant after moving to Japan?

Yes. The SRT is still the UK domestic residence test. If you visit the UK, keep accommodation, have family there, perform UK workdays, or retain UK ties, the SRT can still produce UK residence. HMRC’s RDR3 guidance should be applied every UK tax year.

For British residents in Japan, can the UK-Japan treaty stop double taxation?

It may help, but it is not automatic. The treaty can allocate taxing rights and may support relief, but the taxpayer still needs correct UK and Japan filings. Foreign tax credit claims require calculation, evidence, and timing alignment.

For UK residents in Japan, should the Japanese return wait until the UK Self Assessment is complete?

Sometimes the UK liability is needed to support Japan-side foreign tax credit work, but Japan has its own March 15 deadline. If UK information is not final, you need a filing strategy that manages Japanese deadlines, later corrections if necessary, and documentary support.

For British residents in Japan, who should coordinate the two-country filing?

The best structure is usually one Japan-side tax team and one UK-side adviser working from the same fact pack. Tsuji Global Tax Desk handles the Japanese tax return and Japan-side analysis, while coordinating with your home-country CPA, CA, EA, Steuerberater, or UK chartered tax adviser/accountant for Self Assessment, SRT, FIG, and treaty consistency.

What We Do for You

Tsuji Global Tax Desk focuses on the Japan-side filing and cross-border coordination. For UK residents in Japan, that usually means we prepare or review the Japanese income tax position, identify Japan-reportable foreign income and gains, calculate Japan-side foreign tax credit treatment where available, and coordinate the fact pattern with your UK adviser.

We do not replace your UK accountant for UK Self Assessment, SA100, SA109, SA106, SA108, SRT, or FIG regime advice. Instead, we work alongside them so that the UK return and Japanese return are based on the same travel calendar, income schedule, exchange rate assumptions, treaty position, and tax payment evidence.

This matters for E-E-A-T because cross-border tax errors often occur between advisers, not inside one country’s return. A UK adviser may correctly apply HMRC rules but not know how Japan treats an ISA, SIPP, RSU, or foreign tax credit. A Japan-only preparer may correctly prepare the Japanese return but miss SRT, SA109, TRF, or UK treaty documentation. Our role is to make the Japan-side filing technically defensible while coordinating with the home-country professional who owns the UK side.

Conversion Checklist Before You Contact Us

Before booking a paid scoping call, prepare the following. A complete fact pack lets us use the call for diagnosis rather than basic document chasing.

1. Residence and travel status

• Your Japan arrival date and visa/residence status
• Whether you have lived in Japan for under 1 year, 1-5 years, or 5+ years
• Your address history in Japan for the relevant calendar year
• Your UK day count for each UK tax year in scope
• A travel calendar showing Japan, UK, and third-country days
• UK workdays, especially days with more than three hours of UK work
• UK accommodation details, including owned home, rented home, family home, or available accommodation
• Family location, including spouse/civil partner and minor children
• Whether you have claimed or may claim split year treatment

2. UK filing documents

• Most recent UK Self Assessment return and tax calculation
• SA100 and any supplementary pages used, such as SA109, SA106, SA105, SA108, or employment/self-employment pages
• HMRC notices, statements of account, payments on account, and repayment records
• Any certificate of residence request or treaty-related correspondence
• Your UK accountant’s summary of SRT and FIG position, if available
• Any analysis of pre-6 April 2025 remittance basis income or gains
• Any TRF-related schedule prepared by your UK adviser

3. Japan filing documents

• Prior-year Japanese income tax return, if filed
• Japanese withholding tax slips, employment income statements, or compensation records
• Japan residence card details and My Number information, where needed for filing
• National health insurance, pension, and deductible payment records
• Furusato nozei donation certificates or other deduction certificates, if applicable
• Prior foreign tax credit schedules, if any

4. Income and asset records

• UK employment income, bonus, equity compensation, and director fee records
• Freelance or sole trader income by client and country
• UK rental income statements, expenses, mortgage interest records, and agent statements
• Bank interest and dividend statements
• Brokerage annual statements and transaction histories
• ISA statements, including underlying dividends, interest, sales, and fund distributions
• SIPP or pension contribution and distribution records
• RSU, stock option, ESPP, and share plan vesting/exercise/sale records
• Cryptoasset transaction reports, if applicable
• Business expense records and invoices

5. Tax paid and deadline information

• UK tax paid dates and amounts
• UK tax assessed but not yet paid
• Foreign withholding tax certificates
• Japan tax prepayments or withholding amounts
• Upcoming UK 31 January filing/payment deadline items
• Upcoming UK 31 July payment on account items, if applicable
• Japan March 15 final return deadline items
• Any amended return, enquiry, late filing, or penalty notice

6. Questions to decide before the call

• Are you asking only for Japan-side filing, or do you also need coordination with your UK adviser?
• Is the urgent issue SRT, FIG, Japanese foreign tax credit, ISA/SIPP treatment, UK property, equity compensation, or all of these?
• Do you need a filing position for the current year, a correction for prior years, or planning for the next UK/Japan tax year?
• Have you already taken a UK treaty position, and was the same position reflected in Japan?
• Are there remittances to the UK or Japan that involve pre-6 April 2025 income or gains?

For GB clients: Book a paid scoping call —

Book a paid scoping call

Official Sources

• HMRC main site: https://www.gov.uk/hmrc
• HMRC RDR3 Statutory Residence Test guidance: https://www.gov.uk/government/publications/rdr3-statutory-residence-test-srt/guidance-note-for-statutory-residence-test-srt-rdr3
• HMRC remittance basis abolition guidance: https://www.gov.uk/hmrc-internal-manuals/residence-domicile-and-remittance-basis/rdrm31010
• HMRC Temporary Repatriation Facility guidance: https://www.gov.uk/hmrc-internal-manuals/residence-domicile-and-remittance-basis/rdrm71000
• HMRC Self Assessment: https://www.gov.uk/self-assessment-tax-returns
• National Tax Agency Japan, individual income tax information: https://www.nta.go.jp/english/taxes/individual/index.htm
• National Tax Agency Japan, non-resident individual tax overview: https://www.nta.go.jp/english/taxes/individual/12006.htm
• Japan Ministry of Finance, tax conventions: https://www.mof.go.jp/tax_policy/summary/international/tax_convention/