Trek Guide

The 183-day rule is only half the story when you work abroad for months

183 days is a common tax trigger, but the UK, Spain and Portugal can catch you sooner, and US citizens are taxed anyway. How each counts.

By Bishnu Adhikari · Oct 9, 2026

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Spending more than 183 days in a country in a year is the most common way to become tax resident there, but it is only one of several tests, and many of them catch you sooner. The UK can treat you as resident after 16 days if you have enough ties, Portugal…

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Why is 183 days the number everyone quotes?

Because 183 days is just over half a year, and it appears both in many countries' domestic rules and in the model tax treaty most treaties copy. The OECD Model Tax Convention, Article 15, says your salary for work done in another country stays taxable only at…

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How does the UK decide if you are tax resident?

The UK uses the Statutory Residence Test: 183 days or more in the UK in the tax year makes you resident automatically, but fewer days can do it too if you have enough ties. The UK tax year runs from 6 April to 5 April, and GOV.UK says residents "normally pay…

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Does the 183-day rule apply to Americans?

For US citizens, no day count gets you out: the IRS says citizens and resident aliens abroad are "subject to tax on worldwide income from all sources." The country you work from may tax you as well. The foreign earned income exclusion is not built for…

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How does Australia decide?

Australia's 183-day test makes you resident if you are in Australia for more than half the income year, unless your usual place of abode is outside Australia and you have no intention to take up residence. The ATO (page updated 3 June 2026) says the days need…

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How do Spain and Portugal count your days?

Both use more than 183 days as the headline, but Spain counts the calendar year and adds sporadic absences, while Portugal counts any 12-month window and can make you resident through a home alone. Spain's tax agency says you are resident if you spend more…

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Why might your employer say no?

Your employer has two risks: payroll obligations in the country you work from, and the chance your presence creates a "permanent establishment" that makes the company itself taxable there. That, not doubt about your work ethic, is why many employers cap…

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What should you check before you go?

Six checks cover most workations: your days, your counting period, your home, your employer, the treaty and your paper trail. Tax, calendar, income year or rolling 12 months. It is the first treaty tie-breaker. Dates and country, before you book. Your home…

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Our verdict

Keep a workation under three months, keep your home and your employer's written approval, and you will usually stay taxed where you live now. Past that, stop treating 183 days as a finish line: the UK ties test, Portugal's home test and Spain's…

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Keep reading

The visa side: where visitors may work remotely. Which countries offer one, and the income they ask for. Travel, nomad or expat plan, and what each leaves out. Why working abroad does not make you tax-free. Sources: OECD, Model Tax Convention on Income and on…

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