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Moving from the US to the UK: a tax planning map

A US-to-UK move can begin UK tax questions without ending every US question. Determine each domestic position first, preserve the different tax-year timelines, and then coordinate income, reporting, and relief instead of treating the move as a change of address.

Coverage period
Evergreen framework for identifying questions. It does not determine the residence, filing requirements, reporting obligations or tax of any person. The synthetic example states no year-specific figures; deadlines, thresholds and form versions change by tax year and are not covered here.
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Do not use geography as the filing answer

Living in the UK can create UK residence and reporting questions, while US citizenship, green-card status, federal residence rules, or continuing state connections can preserve separate US questions. The right starting point is a jurisdiction-by-jurisdiction map, not a single label such as expat.

Build both timelines

The US tax year for individuals is normally the calendar year; the UK tax year runs from 6 April to 5 April. The two never align, so the events of one US return period always fall into two UK tax years, and a move part-way through either year can add a UK split-year question or a US dual-status question on top. Source documents and payment dates need to be retained with their original periods.

Separate payroll documents from final tax positions

A W-2, P45, P60, payslip, or withholding record is evidence about payroll and tax withheld; it is not by itself the final cross-border classification. Keep the documents, reconcile them to employment and work-location periods, and investigate any mismatch rather than forcing one form into the other system.

Coordinate relief after the domestic positions

Foreign-tax credits and treaty positions can reduce double taxation in supported circumstances, but they have predicates, limitations, and evidence requirements. Complete the domestic residence, source, and liability analysis before relying on a relief mechanism. Two treaty questions belong earlier: if both countries treat you as resident for the same period, the treaty residence tie-breaker can change which return position applies; and for a US citizen living in the UK, the treaty's relief article sets the order in which the two countries give credit, so the two calculations interact rather than simply following one another.

Worked example

Synthetic example: Jordan moves from California to London in July, keeps a US brokerage account, and receives pay from a UK employer for the rest of the year.

  • Map the July move against the US calendar year and the UK tax year beginning the previous April.
  • Investigate UK residence and split-year conditions, continuing US federal status, and California departure evidence separately.
  • Inventory the W-2, UK payroll records, brokerage statements, and taxes paid before evaluating coordination or relief.

The example does not determine Jordan's residence, state domicile, reportable assets, tax liability, relief, or filing forms.

US-to-UK move sequence

  • Record the last US and first UK home dates
  • Record employer and work-location changes
  • Preserve US and UK payroll documents separately
  • Inventory accounts, investments, property, and pensions
  • Identify domestic positions and any treaty residence question before credit analysis

Sources

Read the tax guides