Tax residency

Can I keep my Portuguese tax residency with a company in Dubai?

Short answer: yes, it is technically possible — but it is rarely the configuration that makes sense. The UAE's favourable tax regime only materialises, in most cases, when you are also a tax resident of the UAE. Here is why, with the clear rules from both sides.

How Portugal defines tax residency

Article 16 of the CIRS establishes that anyone is a Portuguese tax resident in a given year if they:

• Stayed in Portugal more than 183 days, consecutive or interspersed; or
• Stayed less, but has housing in Portugal that suggests intent to occupy it as habitual residence; or
• Is a crew member of a vessel/aircraft registered in Portugal; or
• Has their "centre of vital interests" in Portugal — dependent family, main economic activity, patrimonial assets.

If you meet any of these criteria, you are a Portuguese tax resident and your worldwide income is taxed in Portugal.

How the UAE defines tax residency

The criterion is simpler: have your Emirates ID + effective stay in the territory (in practice, 183 days per year for solid tax residency, although the formal rule may require less for issuance of the Tax Residency Certificate).

The UAE issues a Tax Residency Certificate (TRC) which is the document that proves tax residency, useful to invoke the Double Tax Treaty (DTT) between Portugal and the UAE.

The Portugal–UAE Double Tax Treaty

Portugal and the UAE have a Double Tax Treaty in force since 2012. In situations of apparent residency in both countries, the DTT establishes tiebreaker rules:

1. Where do you have permanent housing available?
2. If both, where is your centre of vital interests?
3. If still undetermined, where do you habitually stay?
4. If still undetermined, nationality.
5. Last, agreement between tax authorities.

The "I keep Portuguese residency" scenario

If you keep Portuguese tax residency and have a company in the UAE:

• The UAE company pays 0% (or 9%) of Corporate Tax according to the applicable regime.
• Dividends you distribute from the company personally are taxed in Portugal as capital income (category E), at the autonomous rate of 28% (or included in the global rate).
• If you are considered the "effective administrator" from Portugal, the Tax Authority may re-qualify the company as a Portuguese tax resident, taxing the entire profit under Portuguese IRC (21% + surcharges).

Conclusion: keeping Portuguese tax residency cancels much of the benefit of the UAE structure. It only makes sense in specific cases (family in Portugal, secondary UAE company for an international niche).

The "I transfer residency to the UAE" scenario

To exit the Portuguese tax regime, you need to:

• Notify the Portuguese Tax Authority of the residency change (address change to the UAE, via Portal das Finanças).
• Not meet the criteria of Article 16 (stay less than 183 days, not maintain permanent housing in Portugal in restrictive legal terms, move the centre of vital interests).
• Request the UAE Tax Residency Certificate to support the new tax residency.

From that date, you are subject to Portuguese IRS only on Portuguese-source income (Portuguese real estate rentals, Portuguese real estate capital gains, certain capital income).

Children studying in Portugal? Family living in the house?

Important practical points:

• Having children studying in Portugal does not automatically determine tax residency — but it is one of the "centre of vital interests" indicators the Tax Authority weighs.
• Having a house in Portugal can be problematic if it is your only permanent dwelling. Having a house in Portugal + permanent housing in the UAE (Ejari) is a defensible situation.
• The spouse also has their own tax residency. Couples can have different tax residencies (common case: entrepreneur in Dubai, spouse in Portugal). Each case is analysed individually.

The hybrid (DTT) scenario

If the Portuguese and Emirati authorities disagree on where you are resident, the DTT is invoked. In clean cases — entrepreneur moves to Dubai with Free Zone company, goes to Portugal 60 days/year to visit family — the DTT resolves in favour of the UAE.

In grey cases — entrepreneur spends 100 days in Portugal, 80 in Dubai, 80 travelling — there may be dispute. Here documentation quality matters: UAE rental contracts, utility bills, travel records, UAE TRC.