Tax Residency Day Counter

What Is Tax Residency and Why Do Days Matter?

Tax residency determines which country has the right to tax your worldwide income. Many countries decide residency at least partly on how many days you spend within their borders during a given period. Unlike citizenship, tax residency can change from year to year based on where you physically spend your time.

For expats, digital nomads, and anyone who splits their time across several countries, these days can decide where you owe tax. One day too many in a country can make you a tax resident there, which can mean tax on your income from every country. Staying away from your home country long enough can, under some countries' rules, make you non-resident there.

The challenge is that different countries use different rules, different counting methods, and different time periods. Some count calendar years, others use rolling 12-month windows, and some apply weighted formulas across several years. This tool counts your days against five of these tax rules, and against the Schengen 90/180 rule, which is a visa rule and not a tax rule. Use it as a first check before you confirm with the tax office or an adviser.

Common Tax Residency Rules Explained

The 183-day rule is a common test: in many countries, spending 183 days or more there in a year is one of the ways you become a tax resident. Each country writes its own version, and the year it counts can be the calendar year or the country's own tax year. In this tool, the 183-day rule counts the calendar year and the UK rule counts the UK tax year, 6 April to 5 April. Some countries count any part of a day as a full day, while others only count the days you are present at midnight.

The NZ 325-Day Absence Rule is specific to New Zealand. To become a non-resident taxpayer, you must be absent from New Zealand for more than 325 days in any 12-month period. This is particularly relevant for New Zealand citizens and residents who move overseas but want to establish non-resident status for tax purposes. The 12-month period does not need to align with the calendar year, the IRD will look for any consecutive 12-month period meeting the threshold.

The US Physical Presence Test is used to qualify for the Foreign Earned Income Exclusion (FEIE), which allows US citizens abroad to exclude up to $132,900 (2026) of foreign earned income from US federal tax. To qualify, you must be physically present in a foreign country for at least 330 full days during any 12-month period. A "full day" means a complete 24-hour period from midnight to midnight, travel days typically do not count.

The US Substantial Presence Test determines whether a foreign national is treated as a US tax resident. It uses a weighted formula across three years: 100% of days present in the current year, one-third of days in the prior year, and one-sixth of days two years prior. If the weighted total equals or exceeds 183 days (and you were present at least 31 days in the current year), you become a US tax resident for that year.

The Schengen 90/180 Rule is not a tax rule but a visa/immigration rule for non-EU nationals visiting the Schengen Area. You may stay for a maximum of 90 days within any rolling 180-day period. Exceeding this limit can result in fines, deportation, or future entry bans. Many digital nomads and frequent travellers need to track this carefully.

Tips for Managing Your Tax Residency

Keeping accurate records is essential. A tax office can ask you to show where you were on given dates, so keep flight itineraries, boarding passes, passport stamps, accommodation receipts and bank statements.

Plan your travel with residency thresholds in mind. If you know you need to stay below 183 days in a country, schedule your travel to leave a buffer, do not cut it to exactly 182 days. Unexpected delays, missed flights, or medical emergencies can push you over the line.

Be aware that some countries have additional tests beyond day counting. Many jurisdictions also consider your "centre of vital interests" (where your family, home, and economic ties are) and your habitual abode. Staying below a day count does not always make you non-resident if other ties remain strong.

Consult a qualified tax professional for your specific situation. Tax residency rules are complex, vary by country, and change periodically. This tool provides day counting and general guidance, but it is not a substitute for professional tax advice tailored to your circumstances.

Frequently Asked Questions