The 183 Day Rule: How Tax Residency is Actually Decided

Tax residency decides which country gets to tax your worldwide income. It is not the same as citizenship, not the same as immigration status, and not something you elect. It is a factual test applied after the fact, and it is entirely possible to satisfy it in two countries at once.

The 183 day figure appears in almost every national rule and in almost every treaty, which is why it is so widely quoted. It is also, on its own, insufficient in most of the systems on this site.

Where the number comes from

Spending more than half a year in a country is the clearest possible evidence that you live there, so most legislatures adopted it. What differs is everything around it.

• Which days count. Some countries count any day on which you were present at midnight. Others count any part of a day. Days spent in transit may or may not count. Days of illness sometimes do not.
• Which period. A calendar year in Germany, Spain and much of Europe. A tax year running 6 April to 5 April in the UK. A rolling twelve months in some jurisdictions. The United States uses a three year weighted formula.
• What else applies. Very few countries stop at day counting. Most add a permanent home test, an economic interests test, or both.

How the larger systems actually decide

The German rule is the one that catches the most people. Keeping a flat available in Germany, even unoccupied, even while working abroad for most of the year, can preserve German residency regardless of how few days were spent there. Subletting it under a genuine arm's length arrangement is a different matter; keeping the keys is not.

When two countries both say yes

Dual residency is common and it does not mean paying twice. Where a double taxation treaty exists, and it almost always does between the countries on this site, the treaty contains a tie-breaker applied in strict order.

1. Permanent home. Where do you have a dwelling available to you on a continuing basis? If only one country, that country wins and the test stops.
2. Centre of vital interests. Where are your personal and economic ties strongest? Family, employment, bank accounts, memberships, where your doctor is.
3. Habitual abode. Where do you actually spend your time, over a longer period than a single year.
4. Nationality. Only if the first three fail.
5. Mutual agreement. The two tax authorities negotiate. This is slow and rare.

Notice that day counting appears third, not first. Someone who spends 200 days in one country while their spouse, children and home remain in another will frequently lose an argument they assumed they had won on the calendar alone. How the treaty then allocates the income is covered in the guide to double taxation agreements.

The 183 day rule that does exist

There is one place where 183 days does something clean and specific: the dependent personal services article in most treaties, sometimes called the employment article. Under it, an employee working temporarily in another state is taxed only at home if three conditions are all met.

• Presence in the other state does not exceed 183 days in the relevant twelve month period.
• The pay is not borne by an employer resident in that state.
• The pay is not borne by a permanent establishment the employer has there.

All three, not one. This is the rule behind short term assignments and business travel, and it is the reason a recharge of costs to a local subsidiary can create a tax liability that the day count alone would not.

Where it goes wrong in practice

Four situations produce most of the disputes.

Leaving without arriving. Departing one country without establishing residency anywhere else rarely produces zero liability. Most systems keep taxing you until you demonstrate residence somewhere, and some, notably Spain, require a tax residency certificate from the new country before releasing you.

Working remotely from abroad. Doing your existing job from another country for a few months can create a taxable presence for you and, in some cases, a permanent establishment for your employer. This is the fastest growing category of problem and it has its own guide: the tax questions to settle before working remotely from abroad.

Split years. Most countries have rules to divide the year of arrival or departure, but they are not automatic and they are not identical. Claiming split year treatment usually requires a specific election.

Exit taxes. Germany, France, Spain, Denmark, Norway and others charge tax on unrealised gains when a significant shareholder ceases residence. This has nothing to do with salary but it derails a great many relocations.