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Germany doesn't wait for you to spend 183 days before it can tax you. Keep a flat you use, and you can be resident from the day you get the keys.
Two doors in, not one
German law gives the tax office two separate ways to treat you as resident, and either one is enough. Under §1(1) of the Income Tax Act (Einkommensteuergesetz), a natural person who has "einen Wohnsitz oder ihren gewöhnlichen Aufenthalt" in Germany — a residence or a habitual abode — is unbeschränkt einkommensteuerpflichtig: subject to unlimited income tax. Neither test depends on your nationality, and the famous "183 days" is only one half of the second one.
Both terms are defined in the Fiscal Code (Abgabenordnung, AO), not left to guesswork.
A home can be enough (§8 AO)
Section 8 AO is short. A person is resident "at the place at which they maintain a dwelling under circumstances from which it may be inferred that they will maintain and use such dwelling."
Read it again — it counts no days. If you keep an apartment in Germany that is available to you and that you actually use, you can hold a Wohnsitz there even while spending most of the year elsewhere. Whether you own or rent it is irrelevant, and registering with the Einwohnermeldeamt is only evidence, not the test itself: per PwC's Worldwide Tax Summaries, the objective circumstances control, and a dwelling that is merely available and used can establish residence.
Under the Wohnsitz test, a home you keep and use can make you a German tax resident before you have spent a single "qualifying" day. That is the quiet trap for people who move abroad but hold on to a flat "just in case," or who arrive and sign a lease on day one.
The six-month rule (§9 AO)
The second door is the gewöhnlicher Aufenthalt, or habitual abode. Section 9 AO says you have one "at the place at which they are present under circumstances indicating that their stay ... is not merely temporary," and then draws a bright line:
"An unbroken stay of not less than six months' duration shall be invariably and from the beginning of such stay regarded as an habitual abode ... brief interruptions shall be excepted."
Three things follow from that exact wording:
- It is more than six months, unbroken — not a calendar-year tally. The period can straddle a year-end, so a continuous stay from, say, November to May can qualify.
- It applies from the beginning of the stay, retroactively, once the six months are reached.
- Brief interruptions — a trip home, a short holiday — do not reset the clock.
There is one narrow exception: the six-month rule does not apply where the stay is "exclusively for visiting, recuperation, curative or similar private purposes" and lasts no more than a year. Work is not a holiday.
What being resident actually means
A residence or a habitual abode triggers unbeschränkte Steuerpflicht — unlimited liability — which means Germany taxes your worldwide income, not only what you earn inside Germany. A double-taxation treaty may then hand specific income back to another country, but the starting point is global.
Exactly which income, and how a treaty re-allocates it, depends on your facts and the specific treaty. This is genuinely country- and situation-specific, so confirm your own case with the Finanzamt or a Steuerberater.
Three "day counts" people mix up
Much of the confusion is that at least three different day-rules can touch the same trip, and they answer different questions:
| Rule | What it decides | Rough threshold |
|---|---|---|
| Habitual abode (§9 AO) | Whether you are tax resident in Germany | more than 6 months, unbroken |
| Treaty 183-day rule (OECD Art. 15) | Where your employment income is taxed | 183 days in the relevant period |
| Schengen 90/180 | How long you may legally stay as a visitor | 90 days in any 180 |
The treaty "183-day rule" is the one most people mean — but it decides where an employee's wages are taxed, not whether you are resident, and it only helps when the pay comes from a non-German employer without a German permanent establishment (see Article 15 of a typical tax treaty). The Schengen 90/180 count is immigration law and has nothing to do with tax at all. We unpick the wider muddle in The "183-day rule" is not one rule; and when two countries both claim you as resident, the treaty tie-breaker — permanent home, then centre of vital interests, then habitual abode, then nationality — decides which one wins.
The record that settles it
Whichever test is in play, the argument comes down to facts: where your home was, and which days you were actually in the country. If the Finanzamt believes you crossed into habitual abode, the burden of showing otherwise — the exact dates in and out — tends to fall on you.
That is the case for keeping a contemporaneous record rather than reconstructing one years later from memory and boarding passes. Countly counts your days in each country automatically and privately, on your phone, so the tally is always there — for the six-month line, for a treaty's 183 days, and for the Schengen 90/180 — without keeping a spreadsheet.