The most expensive sentence in international tax planning is “but I have a residence permit there”. It usually comes from someone who spent 40 days in Dubai, 200 days in Munich and is now reading a letter from the German tax office.
Immigration law and tax law run on separate tracks. This guide explains why, shows the tests of four popular countries and lists what actually proves where you’re tax resident. For the general rules (183-day myth, home tests, treaty tie-breakers), read the tax residency guide first. All information as of September 2026.
Two systems, two questions#
| Residence permit | Tax residency | |
|---|---|---|
| Question | Are you allowed to live here? | Do you actually live here? |
| Decided by | Immigration authority | Tax authority |
| Based on | Nationality, investment, income, job, family | Days, home, centre of interests, sometimes nationality |
| Proof | Permit card, visa | Tax residency certificate, lease, bills, day count |
| Can you have several? | Yes, in as many countries as will have you | Yes – which is where treaties come in |
| Does it need the other? | No | No |
The last row is the whole point. Neither system asks the other for permission.
The four combinations#
| Tax resident | Not tax resident | |
|---|---|---|
| With permit | The normal case: you moved, you live there | Golden visa holders, Cyprus permanent residents who visit once every two years, UAE visa holders who mostly live elsewhere |
| Without permit | EU citizens who never registered, visa-free long stays, people who overstay – tax law doesn’t care whether your stay was legal | Tourists, business travellers |
The two expensive corners are the diagonal ones. “Permit, but not tax resident” fools people into thinking they’ve left their old country. “Tax resident, but no permit” surprises people who thought a short-term stay couldn’t make them taxable.
Four countries, four tests#
UAE: 183 days, or 90 with ties#
The UAE has no personal income tax, but it defines tax residency for certificates and treaties (Cabinet Decision 85 of 2022, Ministerial Decision 27 of 2023). You’re resident if any of these applies:
- your usual or primary place of residence and your centre of financial and personal interests are in the UAE,
- you spend 183 days or more in the UAE in a 12-month period, or
- you spend 90 days or more in a 12-month period and you’re a UAE or GCC national or hold a valid UAE residence permit, and you have a permanent place of residence or a job or business in the UAE.
Days and part-days count, they don’t need to be consecutive. The Federal Tax Authority issues the tax residency certificate online via EmaraTax. Note the logic: the residence visa is only one ingredient of the 90-day test. Without the days and a home or business, the visa gives you nothing tax-wise. More in moving to Dubai.
Cyprus: 183 days, or the 60-day rule#
Cyprus makes you resident with more than 183 days in a calendar year – or with 60 days if you also don’t spend more than 183 days in any other single country, aren’t tax resident anywhere else, run a business, work or hold a directorship in Cyprus, and keep a permanent home there. Details in the tax residency guide.
A Cyprus permanent residence permit (Regulation 6(2)) needs one visit every two years. Tax residency needs 60 days plus the other conditions. Same island, very different bars.
Portugal: 183 days, or a habitual home#
Under Article 16 of the Portuguese income tax code, you’re resident if in any 12-month period starting or ending in the tax year you either spend more than 183 days in Portugal or have a home there in conditions suggesting you intend to keep it as your habitual residence. Residence starts on the day you meet a condition, so a split year is possible.
A golden visa holder with seven days a year isn’t tax resident. A D7 holder who actually moves usually is – which is exactly what Portugal wants, and what the IFICI regime requires. The certificate (certidão de residência fiscal) comes from the Portal das Finanças.
Paraguay: more than 120 days#
Paraguay is commonly summarised as treating individuals as tax resident with more than 120 days in the country in a calendar year; the tax office (DNIT) issues residence certificates under its own procedure. Some local advisors argue the 120 days are a civil-law domicile rule and that tax registration (RUC) matters more. Either way, the cédula alone isn’t enough – and Paraguay taxes mainly Paraguayan-source income anyway.
Your old country gets a vote too#
Getting tax residency somewhere new doesn’t automatically end it at home. Many countries keep you resident as long as a test is still met:
- Germany: any home available to you (Wohnsitz) makes you resident with zero days. Keeping your flat “for visits” keeps you German tax resident.
- Spain: more than 183 days, or your main business or economic interests in Spain; you’re presumed resident if your spouse and minor children live there.
- Italy: since 2024 you’re resident with more than 183 days of presence, your residence or your domicile (main personal and family ties) in Italy for most of the year. Registration in the population register is now a rebuttable presumption.
If both countries claim you, the double tax treaty’s tie-breaker decides: permanent home, centre of vital interests, habitual abode, nationality. It only works if there’s a treaty – Germany and the UAE, for example, have had none since the end of 2021. The step-by-step version is in the tax residency guide; Germans should also read leaving Germany.
Worked example: same visa, different result#
Anna is German, owns a Dubai free zone company and holds a UAE investor visa.
Version 1: she keeps her Munich flat, spends 70 days in Dubai, 170 in Germany and the rest travelling. UAE: under 90 days, no tax residency certificate. Germany: home available, so she’s resident – on worldwide income, including dividends from her Dubai company. The visa changed nothing.
Version 2: she gives up the Munich flat, deregisters, rents an apartment in Dubai year-round and spends 130 days there, 60 in Germany in hotels and the rest travelling. UAE: 90-day test met (visa + permanent residence + business), certificate available. Germany: no home, no stay of more than six months, so not resident under German law. Same visa, same company, completely different tax outcome. Check the German exit tax before she moves, though.
Resident nowhere?#
If you meet no country’s test, you’re “tax resident nowhere”. It’s legally possible, but fragile: your old country may argue you never left, treaties don’t protect you, and banks reporting under the Common Reporting Standard want a country of residence. Most people are better off with one clean home base. The details are in the legal side of perpetual travel.
What proves your tax residency#
| Document | What it proves | Tip |
|---|---|---|
| Tax residency certificate | The new country treats you as resident | Apply every year; UAE via EmaraTax, Portugal via Portal das Finanças |
| Lease or title deed | A permanent home | Year-round, in your name, not a holiday let |
| Utility, internet and phone bills | The home is actually used | Twelve months, not just the first one |
| Day log and flight records | Where you were on which day | Log it as you go with the day tracker; UAE authorities can issue an entry/exit report |
| Residence permit | Legal right to stay | Necessary for some tests (UAE 90 days), never sufficient |
| Deregistration at home | The break with the old country | E.g. the German Abmeldung – helpful, but not decisive on its own |
| Local tax ID and returns | You’re in the local system | Even in no-tax countries, file what can be filed |
| Local life | Centre of vital interests | Bank, health insurance, doctor, gym, kids’ school |
Traps and red flags
“My visa makes me tax resident.”
It doesn’t – in the UAE it’s one of several conditions, elsewhere it’s irrelevant.
The forgotten flat.
A home you keep “just in case” is the most common reason people stay tax resident in Germany.
Counting only calendar years.
The UAE and Portugal use 12-month periods that can straddle two years.
Relying on a golden visa.
Seven days in Portugal or zero days in Greece won’t make you tax resident there – and won’t end residency at home.
Agents selling certificates.
A tax residency certificate is issued by a tax authority based on facts. Anyone offering one without the days and ties is selling a document you shouldn’t use.
No treaty, no tie-breaker.
Between Germany and the UAE, you have to fail Germany’s own tests; there’s no treaty to rescue you.
FAQ#
Does a residence permit make me tax resident?
No. Tax residency depends on days, a home, your centre of interests and each country’s specific tests. The permit is at most one ingredient, as in the UAE’s 90-day rule.
Can I be tax resident without a residence permit?
Yes. Tax law looks at facts, not immigration status. EU citizens, visa-free visitors and even people staying illegally can become tax resident if they meet the test.
How many days do I need in the UAE for a tax residency certificate?
183 days in a 12-month period, or 90 days if you hold a UAE residence permit (or are a UAE or GCC national) and have a permanent place of residence or a job or business in the UAE, as of September 2026.
Does a Portuguese golden visa make me tax resident in Portugal?
Not by itself. You’re Portuguese tax resident with more than 183 days in a 12-month period or a home you use as your habitual residence. The golden visa asks for about seven days a year.
Can I be tax resident in two countries at once?
Yes, under each country’s own law. A double tax treaty then decides which one wins for treaty purposes. Without a treaty, both can tax you, with only unilateral relief.
What if I’m not tax resident anywhere?
It’s possible but risky: your old country may still claim you, you lose treaty protection and banks will ask awkward questions. A clear home base is usually cheaper in the long run.
This guide is general information, not tax or legal advice. Your case depends on details – book a strategy session if you want it checked.
Sources#
- UAE – Federal Tax Authority, tax residency certificates
- UAE – Cabinet Decision 85 of 2022 on tax residency
- UAE – Ministry of Finance
- Cyprus – Tax Department
- Portugal – Portal das Finanças
- Portugal – Personal Income Tax Code (CIRS), Diário da República
- Paraguay – DNIT, Law 6380/2019
- Germany – § 8 AO, Wohnsitz
- Germany – § 9 AO, gewöhnlicher Aufenthalt
- Spain – Agencia Tributaria, tax residence
- Italy – Agenzia delle Entrate
- OECD Model Tax Convention (2017), Article 4
- OECD – Common Reporting Standard
