Most tax writing for foreigners in Portugal is written for somebody who arrived with a portfolio and a plan. That is not the ordinary Brazilian situation here. The ordinary situation is a work or family route, a job or a CNPJ that did not close cleanly, an apartment in Brazil that is rented out, an INSS record that is still running, and a Banco do Brasil account nobody thought to mention. Each of those has an answer, and the answers are not the same one.
When Portugal starts taxing you
CIRS art. 16 decides it and nothing else does. More than 183 days in Portugal in any 12-month period, consecutive or not; or a home kept here in conditions implying you intend to hold it as your habitual residence.
- Residence begins on the first day of the stay (art. 16 n.º 3), unless you were resident on any day of the previous year, when it backdates to 1 January.
- It ends on the last day of presence (art. 16 n.º 4).
- Where the year splits, each status is assessed separately (art. 15 n.º 3).
From the first day, art. 15 n.º 1 taxes your worldwide income here — the aluguel in São Paulo, the dividends, the freelance work billed to a Brazilian client. Before that day, foreign income is outside Portuguese scope altogether. Assets are the other way round: there is no step-up, so an apartment bought in 2012 carries its 2012 cost into the Portuguese base.
The convention, article by article
Portugal and Brazil signed their convention in Brasília on 16 May 2000; it was ratified by Decreto do Presidente da República n.º 27/2001 and published on 27 April 2001. It is a modern text and it is legible, so this page cites it by article.
Pensions — and this is the one people get wrong
| Payment | Who may tax it | Article |
|---|---|---|
| Private pension from past employment | The state of residence only — Portugal | art. 18(1) |
| Paid under the social-security legislation of a state | That state only — Brazil for an INSS pension | art. 18(2) |
| Public remuneration and pensions for services rendered to a state, paid to its own national | That state | art. 19(2) |
Two payments, both from Brazil, both arriving in the same month, taxed by different governments. This is the single most useful thing on the page for anyone drawing a pension, and it is decided by which article the payment falls into, not by where the retiree lives.
Employment
Article 15 gives salaries and similar remuneration to the state of residence, unless the employment is exercised in the other state — in which case that state may tax it. Where the work is done in the other state, the exception itself has conditions, the first being that the person is present there for no more than 183 days in any 12-month period beginning or ending in the fiscal year concerned.
Withholding ceilings
| Income | Ceiling | Article |
|---|---|---|
| Dividends, corporate beneficial owner holding at least 25% directly for the two uninterrupted years before payment | 10% of gross | art. 10(2)(a) |
| Dividends, all other cases | 15% of gross | art. 10(2)(b) |
| Interest | 15% of gross | art. 11 |
| Royalties | 15% of gross | art. 12 |
These are ceilings on the source state and not rates that apply by themselves. A Brazilian payer withholding above the ceiling produces tax Portugal will not credit, because CIRS art. 81 n.º 2 caps the Portuguese credit at the treaty rate. The excess is reclaimed in Brazil or lost.
Relief: article 23 and CIRS art. 81
Article 23 of the convention gives the ordinary credit: where a resident of one state has income that may be taxed in the other, the first state deducts an amount equal to the income tax paid there. CIRS art. 81 then does the arithmetic, and the amount is the lesser of the tax actually paid in Brazil and the fraction of Portuguese tax attributable to that income. Unused credit carries forward five years.
What to declare, and the box nobody expects
| Item | Where |
|---|---|
| Brazilian income of any category, and the Brazilian tax paid | Anexo J |
| Any account held in Brazil | Folha de rosto, quadro 11 |
| Work billed through Portuguese green receipts | Anexo B, or C under organised accounting |
| Gain on selling a Brazilian property or shares | Anexo G, or G1 |
| IFICI | Anexo L |
The return is filed between 1 April and 30 June, and 30 June applies whether or not it is a business day. If you are starting self-employment here rather than arriving with income, opening activity and the social-security rules are the other two things to get right in the first year.
The Brazilian side
Portugal taxes my INSS pension?
No. Article 18(2) of the Portugal–Brazil convention gives pensions paid under a state's social-security legislation to that state only, so an INSS retirement is taxed in Brazil and not in Portugal. A private pension from a former employer is the opposite: article 18(1) gives it to the state of residence.
How many days make me a Portuguese tax resident?
More than 183 in any 12-month period, consecutive or not. Or, with no day count at all, keeping a home here in conditions that imply you intend to hold it as your habitual residence. That is CIRS art. 16, and it is the whole test.
Does the equality statute change my tax position?
It is a rights instrument rather than a tax one, and our sources do not describe it. What is settled is the negative: Portuguese tax residence is decided by CIRS art. 16 on presence and housing, and no residence permit or statute changes that test.
I work remotely in Portugal for a Brazilian company. Who taxes that?
The employment is exercised where you physically are, so Portugal taxes it under article 15 as the state of residence and of exercise. Portuguese social security attaches separately, on its own rules.
Do I have to declare my Brazilian bank account?
Yes, in quadro 11 of the Modelo 3 folha de rosto. There is no income threshold, an account that earned nothing is still declared, and being authorised to move somebody else's account is enough on its own.
How much can Brazil withhold on dividends paid to me in Portugal?
Article 10(2) caps it at 15% of the gross, or 10% where the beneficial owner is a company holding at least 25% directly for the two uninterrupted years before payment. Portugal credits only up to the treaty ceiling, so anything withheld above it is reclaimed in Brazil.
Does Portugal tax the sale of my apartment in Brazil?
If you sell while resident here, the gain is in the Portuguese base, and Portugal gives no step-up for the value on the day you arrived — the original purchase price and date carry over. Brazilian tax on the same sale is credited under CIRS art. 81, up to the lesser of what Brazil charged and what Portugal would have.