A free 183-day rule calculator that counts your days in each country, per year and in the last 12 months, the US way and the UK way.
Add your trips to count your days in each country for the 183-day rule, per year and in the last 12 months.
Your trips
Add past and planned trips, each with the day you arrived and the day you left. Both days count.
No trips yet. Add your past trips and the ones you've planned, or try an example.
How to count
The US counts a day if you were there at any time that day. The UK counts a day only if you were there at midnight.
Days in each country
Add a trip to see your days in each country.
These are counts of days, not tax advice. Each country has its own residence rules and exceptions, so check them with the country's tax office or an advisor.
This free 183-day rule calculator counts the days you've spent in each country, per year and in the last 12 months.
Add your trips once. It counts every country side by side, the way the US counts and the way the UK counts, and runs the US substantial presence test for you.
Here's what the 183-day rule is, why countries count days differently, and how nomads keep track.
What is the 183-day rule?
The 183-day rule is a common test for tax residence: spend 183 days or more in a country in a year, and it may treat you as a tax resident.
It's a rule of thumb, not 1 law. Each country writes its own test, with its own year and its own way of counting a day.
Here's how the 2 best-known tests compare:
| Country | The test | Its year | How a day counts |
|---|---|---|---|
 United States | Substantial presence: 183 days over 3 years, weighted | January to December | Any part of a day |
 United Kingdom | Statutory residence test: 183 days is 1 of its tests | April 6 to April 5 | Present at midnight |
The calculator counts both ways, so you can read either test off the same trips.
How the US substantial presence test works
The IRS counts all your days in the US this year, a third of last year's, and a sixth of the year before. If that adds up to 183, and this year has at least 31, you meet the test.
The IRS's own example: 120 days a year for 3 years is 120 + 40 + 20, which is 180. That's under 183, so it doesn't meet the test.
The calculator runs this for you when your trips include the US. It doesn't apply the IRS's exceptions, such as commuters from Canada or Mexico, so check them on the IRS page.
How the UK counts days
The UK counts a day only if you're in the UK at the end of it. That's in the law itself: Finance Act 2013, Schedule 45, paragraph 22.
Spending 183 days or more in the UK in a tax year is 1 of its automatic tests. Others look at your home and your work, and the sufficient ties test can make you resident with fewer days.
The UK's tax year runs from April 6 to April 5, so count from April 6, or read the last 12 months.
Any part of a day, or midnights?
A trip from January 1 to 10 is 10 days the US way, and 9 the UK way.
A travel day can count twice the US way. Fly from Portugal to Spain on January 10, and that day counts for both.
Switch between the 2 in step 2 of the calculator.
A nomad's year, counted
Here's a year split across 4 countries, from arrival to departure:
| Country | Trip | Days, any part | Midnights |
|---|---|---|---|
 Portugal | January 1 to April 30 | 120 | 119 |
 Thailand | May 1 to July 29 | 90 | 89 |
 Mexico | July 30 to October 17 | 80 | 79 |
| United States | October 18 to December 31 | 75 | 74 |
No country reaches 183. That doesn't make this traveler tax resident nowhere: other tests, like where your home is, still apply.
How to use the 183-day rule calculator
Your trips are the same list the Schengen calculator uses, and they fill in the countries visited map too. For where to go next, the visa-free countries map shows how long your passport can stay.
Keep a record
A count is only as good as the dates behind it. Here's how to keep yours:
Since April 10, 2026, Schengen borders record every entry and exit too, so your record should match theirs.
3 mistakes nomads make with the 183-day rule
These are the ones that cost money:
- Thinking under 183 days anywhere means tax resident nowhere
- Counting by calendar year when the country's tax year starts in April or July
- Forgetting that travel days can count for 2 countries at once
Tax rules are where a good accountant pays for themselves many times over.
Who is the 183-day rule calculator for?
It's for digital nomads, remote workers and founders who split the year between countries, and want to know where their days add up.
I've lived in 19 countries this way, and wrote about it in what is a global citizen. If you're building the income to do it too, start with how to make money online as a creator and a recurring revenue business. More tools are on the free travel tools page.
These are counts, not tax advice. Take them to your accountant, and check each country's own rules.
183-Day Rule Calculator FAQs
Questions about the 183-day rule? Here's what to know.
The 183-day rule is a common tax residence test: spend 183 days or more in a country in a year, and it may treat you as a tax resident.
Each country writes its own version, so check its rules.
To count your days in a country, add up the days you were there in the period its rule uses.
The 183-day rule calculator does it from your trips, per year and in the last 12 months.
A travel day counts as a day in both countries when the rule counts any part of a day, as the US does.
When a rule counts midnights, as the UK does, it counts only where you were at the end of the day.
The US substantial presence test counts your days in the US this year, a third of last year's, and a sixth of the year before.
You meet it with 183 weighted days and at least 31 this year.
The UK tax year starts on April 6 and ends on April 5 the next year.
So a UK day count runs from April 6, not from January 1.
The 183-day rule isn't the same in every country.
Countries differ on the year they use, how they count a day, and the other tests that can make you resident.
The 183-day rule calculator is free, with no sign-up.
Your trips stay in your browser.
The 183-day rule calculator is for digital nomads, remote workers and founders who spend the year in more than 1 country.
I did. I'm Navid Moazzez, and the 183-day rule calculator is one of my free tools on navid.me.
Read about me, or see my creator profile.
For travel, you can also use the passport index, the passport comparison, the second passport calculator, the visa-free countries map, the Schengen calculator, the travel advisory map, the golden hour calculator, the time zone overlap calculator, the time zone converter and the countries visited map, all free on navid.me.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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