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EDITORIAL POLICY
How we write these guides
Portuguese tax guidance is the kind of content where being confidently wrong costs somebody money. This page explains where our facts come from, how they are checked, and what happens when one turns out to be wrong.
22 published guides, current for the 2026 tax year. Most recent fact-check: 2026-08-10.
Where the facts come from
Every guide is written against primary sources — the Código do IRS, the Código do IVA, Segurança Social regulations, and the Autoridade Tributária's and eportugal.gov.pt's own published guidance. Where a claim rests on a specific provision, we cite the article, not just the law: "art. 60.º n.º 1 CIRS", not "the tax code". Those sources are listed at the foot of each guide, so you can check us. We would rather you did.
How they are checked
Statutory facts are not only written down, they are asserted in an automated test suite. Figures like the IRS filing window, the IVA exemption threshold and the Segurança Social contribution rate are pinned to tests that fail the build if the text and the rule drift apart. Each guide carries its own last-reviewed date, updated when that article is genuinely re-checked rather than in a bulk sweep — which is why the dates on our guides differ from one another.
What happens when we are wrong
We have been. In August 2026 a review found three statutory errors in our source corpus, including a filing deadline that we described as rolling forward over a weekend when the law says explicitly that it does not. When that happens we do not quietly edit the text. The superseded version is retracted from the knowledge base so it can no longer be retrieved or cited, the corrected version replaces it, and the guide's review date moves. Leaving both versions live is how a correction becomes two contradictory answers.
What this is not
These guides are general information about Portuguese tax and administrative rules. They are not personal tax advice, and no article can know your circumstances. For anything with real money or a deadline attached — an unusual residency position, a disputed assessment, a business restructuring — talk to a contabilista certificado. We will tell you when we think that is the right call rather than pretending an article is enough.
Who writes them
Our guides are researched and written by the Finkavo team against the sources above, and no single article is the opinion of one person. We do not currently have a named contabilista certificado reviewing them, and we would rather say so plainly than imply a credential nobody here holds. If that changes, this page will name the reviewer.
Found an error? Tell us at hello@finkavo.com — corrections are the fastest way to make this better.