Tax
Tax Residency
Also known as: Tax Resident, Fiscal Residency, Residency for Tax Purposes
Quick answer
HMRC — UK residence and foreign-income tax · IRS — Individual tax residency status · checked 9 Nov 2026
There is no universal day-count rule. For example, HMRC's guidance checked in 2026 combines automatic UK and overseas tests with sufficient-ties rules. A home or work pattern can matter independently of a headline presence threshold.
US rules separately distinguish citizens, resident aliens and nonresident aliens. Arrival and departure years can be split under the applicable rules. Determine residence separately for each jurisdiction and tax year before applying treaty relief or an expat concession.
Sources
- HMRC — UK residence and foreign-income tax · checked 9 Nov 2026
- IRS — Individual tax residency status · checked 9 Nov 2026
Related terms
Substantial Presence Test (SPT)
The US Substantial Presence Test requires at least 31 days in the current year and a weighted total of at least 183 days over that year and the preceding two. Count all current-year days, one-third of the previous year's days and one-sixth of the earlier year's days. These are the IRS rules checked in 2026; excluded days and exceptions can change the result.
Tax Treaty
A tax treaty is an agreement between jurisdictions that can allocate taxing rights, reduce specified taxes and provide relief from double taxation. Entitlement depends on the treaty's text, residence and other conditions. Treaties and protocols have their own effective dates; signing a treaty is not the same as bringing it into force.
FEIE (Foreign Earned Income Exclusion)
The Foreign Earned Income Exclusion allows eligible US taxpayers to exclude up to $132,900 of qualifying foreign earned income for tax year 2026. A foreign tax home and either the bona fide residence or physical presence test are required. The physical presence test requires 330 full days in foreign countries during a consecutive 12-month period. The exclusion does not reduce self-employment tax.
Foreign Tax Credit (FTC)
The Foreign Tax Credit can reduce US income tax for qualifying foreign income taxes paid or accrued. It is subject to source, category and US-tax limitations; it is not a guaranteed refund of foreign tax. Form 1116 is generally used by individuals. Taxes attributable to income excluded under FEIE cannot also generate a credit.
Double Taxation
International double taxation can arise when more than one jurisdiction taxes the same income. Relief may come from a treaty, a domestic foreign-tax credit or an exemption, subject to their conditions. A foreign-tax payment does not automatically eliminate all tax in the other country, and relief is not limited to countries with a treaty.
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The Slowmad Tax Trap: How Splitting Time Between Countries Creates Tax Nightmares
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Moving to China 2026: K Visa, Work Permits, Tax & Arrival Guide
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