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The 183-day rule, explained

183 days is just over half a year, and many tax systems use it as a threshold. But it is a test in each country's own law, counted in each country's own way, and staying under it does not guarantee you are not resident.

How it differs by country

In the UK, 183 midnights in a tax year (6 April to 5 April) makes you automatically resident, but you can be resident on far fewer days depending on your ties. In the US, 183 is a weighted total over three calendar years. Other countries count calendar-year days or use any 12-month period.

Why under 183 is not automatically safe

Most systems also look at your home, family, work and where your life is centred. Tax treaties have their own tie-breaker rules when two countries both claim you. Treat the day count as the first check, not the answer.

Keep a record

Whatever the rule, the evidence is your travel history. A dated log of every trip is what an accountant or tax authority will ask for.

Questions

Is the 183-day rule the same everywhere?

No. Each country defines and counts it differently.

If I stay under 183 days, am I non-resident?

Not necessarily. Other connections can still make you resident.

Sources

Staymark counts days against published rules. This guide is general information, not legal, tax or immigration advice; rules change, so check the official sources above before you travel.