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Cross-Border Taxation UK

Moving abroad. Returning to the UK. Holding overseas income while retaining UK assets. These transitions create double taxation exposure if residence and foreign income treatment are not confirmed before filing. We assess UK tax residence under the Statutory Residence Test and structure reporting accordingly.
  • UK tax residence review
  • Residence-based foreign income treatment
  • Double taxation relief assessment
  • HMRC-compliant cross-border reporting
Book a Cross-Border Review
Legend Fusions is the UK advisory brand evolved from Legend Financial & Tax Advisers, unifying tax, compliance, and advisory services under one international group.
Serving clients in London, Bolton, Milton Keynes and throughout the UK.

When Cross-Border Tax Applies

Cross-border exposure arises when residency, domicile, or income links you to more than one tax system. A move, new overseas income, or retained UK assets often changes reporting obligations faster than expected.
We confirm how HMRC are likely to interpret the position and where exposure may already exist.
  • UK resident with overseas income (employment, dividends, property)
  • Non-resident with UK income or UK assets
  • Changes under the Statutory Residence Test
  • Domicile and deemed domicile status
  • Overseas income taxable in the UK
  • International asset ownership
  • Split-year treatment triggers
  • Double taxation relief eligibility
Request a Cross-Border Tax Review
years experience
+
13+ years handling UK residency, overseas income, split-year cases, treaty disputes and HMRC enquiries

UK Tax Residency and Domicile Rules

Relocating to or from the UK changes your tax position immediately. UK tax residence is determined under the Statutory Residence Test. Overseas income is taxed under the UK residence basis where applicable, including where deemed domicile rules apply.

Errors typically emerge at filing or during HMRC enquiry if the position was not assessed in advance.

✓ Residence assessed under the Statutory Residence Test
✓ Split-year treatment reviewed on arrival or departure
✓ Worldwide income taxed if UK resident
✓ UK-source income taxed if non-resident
✓ Foreign income treatment under residence rules applied
✓ Double taxation relief analysed
✓ Reporting obligations confirmed

Each position is supported with evidence before submission to help avoid HMRC queries. 

UK Tax Residency and Cross-Border Advisory

Our cross-border advisory work confirms residency and worldwide income before positions are filed, where inconsistencies are often discovered.

  • UK tax residency and Statutory Residence Test analysis
  • Domicile review and transitional planning
  • Double taxation treaty and foreign tax credit assessment
  • Risk review across overseas income and UK assets
  • Documentation supporting residency and treaty positions
  • HMRC engagement and enquiry handling where required

We prioritise controlled exposure, defensible positions, and structured planning, not reactive compliance. 

How We Work

We focus on establishing your tax residence and applying the right rules to overseas income, with focus on:

Records review

Travel history, UK ties, overseas income, and split-year position examined.

Technical assessment

Residence status determined. Foreign income treatment, treaty relief, and exposure calculated.

Filing and disclosure

The confirmed position is applied to the return and submitted within statutory deadlines.

What Our Clients Say

“Legend Fusions has been an invaluable resource for both my personal and business tax needs, especially cross-border. Jeffery explains complex U.S.-Canada tax matters with clarity and handles every detail with precision. Always professional, responsive, and deeply knowledgeable with tax matters. I highly recommend Legend Fusions to anyone seeking trusted, stress-free tax guidance.”

Patience Adaobor

“Beenish is professional, patient, and explains bookkeeping clearly. She made me confident in managing my numbers and offers very fair pricing. Highly recommended for anyone seeking a knowledgeable advisor.”

Sarah Mitchell

“Appreciate the support and professionalism of the Legend Fusions team. Knowledgeable, responsive, and reliable for both personal and business tax matters.”

Vishnupriya Panchal

View all client reviews.

Related Tax & Advisory Services

HMRC Tax Investigations

Support responding to HMRC enquiries, compliance checks, and investigations.

HMRC Tax Investigations

Support responding to HMRC enquiries, compliance checks, and investigations.

EIS & SEIS

Guidance on investor reliefs, eligibility, and compliance requirements.

Capital Gains Tax

Advice and reporting support for asset and property disposals.

Inheritance Tax

Planning support where estate exposure is identified.

Capital Allowances

Review and claims to ensure qualifying expenditure is identified and applied correctly.

Personal Tax

Structured advice on income, allowances, and reporting to manage your overall UK tax position efficiently.

Overseas Income and UK Tax

If you are UK resident, overseas income is taxable in the UK unless relief applies. If you are non-resident, UK tax may still apply to UK-source income. Residency and treaty position determine how relief is claimed.

Employment

  • Overseas employment income
  • UK duties linked to foreign salary
  • Split-year treatment on arrival or departure
  • Double taxation relief where tax is paid abroad

Property

  • Foreign rental income taxable if UK resident
  • Capital gains on overseas property
  • Non-resident landlord considerations
  • Foreign tax credit relief claims

Asset-Intensive Businesses

  • Machinery and plant acquired through property transactions
  • Growth-driven capital investment across periods
  • Documentation gaps affecting claim support
  • Positions requiring clarification under HMRC enquiry
  • Your residency status determines whether worldwide income is taxable.

Where We Work

We work with clients across the UK through secure online consultations. In-person meetings are available by appointment at our London office.
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Additional Tax Resources

Self Assessment deadlines explained

Self Assessment deadlines explained

Documents needed for a tax return

Documents needed for a tax return

Penalties for late tax filing

Penalties for late tax filing

Frequently asked questions

Do non-residents pay UK tax?
Yes. Non-UK residents are taxed on UK-source income such as UK rental income, UK employment duties, and certain capital gains on UK property. They are not taxed on foreign income unless UK residency applies.
If you are UK tax resident, you are generally taxed on worldwide income, including foreign salary, dividends, rental income, and capital gains. Relief may be available for foreign tax paid.
Double taxation relief prevents the same income being taxed twice. This is usually provided through foreign tax credit relief or a double taxation treaty between the UK and another country.
UK tax residency is determined under the Statutory Residence Test. It considers days spent in the UK, work patterns, and personal ties to determine whether you are UK resident for a tax year.
The Statutory Residence Test applies automatic UK and overseas tests and, if needed, the sufficient ties test. It determines whether you are taxed on worldwide income or UK-source income only.
Split-year treatment may apply when you move into or leave the UK during a tax year. It can divide the year into UK and overseas parts, limiting UK tax to the relevant period.
Residence determines where you are taxed in a specific year. Domicile reflects your long-term permanent home and affects access to the remittance basis and inheritance tax exposure.
The remittance basis allows certain non-domiciled individuals to pay UK tax only on foreign income brought into the UK. This applies until 2025/26, after which the rules may change. Any future changes would need careful review to assess tax implications and ensure compliance.
Yes. UK residents must report overseas income on their UK tax return. Foreign tax paid may be credited against UK tax, but it does not remove the reporting requirement.
Yes. HMRC receives international financial information under data-sharing agreements. Undeclared offshore income can lead to penalties and interest.
We review your residency status, treaty position, and filings, prepare technical responses, and manage correspondence with HMRC to resolve the enquiry efficiently.
Yes. We advise clients across the UK and internationally on cross-border tax matters through secure remote consultations and document exchange.

Changed Countries or Income Sources?

Residency, overseas income, and domicile positions should be confirmed before filing, particularly where circumstances have recently changed.

Arrange a cross-border tax review to confirm your position