Tax residency when moving overseas

Tax residence is decided by law, not by your flight date

Each jurisdiction defines tax residence under its own domestic law. The OECD's tax-residency portal makes the important worldwide point that a residence permit or citizenship does not by itself create or end tax residence, and that a person can be resident in more than one place.

Record the facts before asking for an answer: nights or days in each country, homes available, where each adult works, where a partner and children live, business roles, and the dates on which arrangements actually change. Do not rely on a single day-count threshold unless the relevant authority says that it is the complete test for your circumstances.

Work out each country's domestic position first

Prepare a separate timeline for the country you leave and the destination. For each one, identify the tax year, residence test, any part-year treatment, required departure or registration steps and the filing date. Then list income and assets that may still be taxable there even if you are non-resident.

Citizenship-based filing can be an additional issue for some nationalities. Employment, self-employment, company directorships, remote work, property income, pensions and investment disposals may also be treated differently. These are reasons to ask a qualified adviser; they are not reasons to assume the most complicated outcome applies to everyone.

• Ask whether residence and domicile are different legal concepts in your departure country.
• Confirm whether departure forms, part-year treatment or non-resident registration apply.
• List continuing local-source income and the withholding or return required after departure.
• Check whether employer payroll, social-security or business obligations change when work is performed abroad.

A tax treaty can help, but it is not a blanket exemption

If both countries treat you as resident, an applicable double-tax treaty may allocate treaty residence using a sequence of tests. Treaties can also allocate taxing rights or provide credit or exemption relief for particular income. The wording, taxes covered, effective date and claim method matter.

Do not summarise a treaty as 'you cannot be taxed twice'. Both countries may require returns, and relief may depend on evidence, timing or a formal claim. Confirm the exact article and how domestic law gives it effect.

Tell financial providers when your tax residence changes

Under the Common Reporting Standard, participating financial institutions collect tax-residence self-certifications and may report information to tax authorities. The OECD states that account holders should disclose all tax residences for CRS purposes. A change of address can therefore lead to requests for tax identification numbers or an updated self-certification.

This reporting framework does not decide whether an account may remain open or whether an investment is suitable. Ask each provider separately about service availability, product restrictions, contributions, withholding and the documents it needs.