What the Portuguese Tax Office Already Knows About Your Income

Every freelancer forum has a version of the same thread: “the tax office sees everything” versus “they only look if they investigate you” — usually argued with equal confidence and no sources. The anxiety is understandable; the facts are calmer than either camp claims.

Here is exactly what the AT (Autoridade Tributária) can see about your money, under which law, and what actually triggers a problem. If you’re declaring your income properly, most of this article is reassuring. If you’re not, the last three sections explain the machinery you’re betting against.

Does the Portuguese tax authority see my bank account?

Not by default, and not transaction-by-transaction. What Portuguese banks report automatically is your year-end balance — and only when your total holdings at that one institution exceed €50,000 on 31 December (Lei n.º 17/2019). The bank sends that figure to the AT by 31 July of the following year. It is the balance only: no transaction list, no merchant names, no MB Way history.

Three details people miss:

• The €50,000 threshold is per person, per bank, aggregated across all your accounts at that bank. €40,000 at two different banks reports nothing; €55,000 spread across three accounts at one bank reports.
• It’s a snapshot, not a stream — one number, once a year.
• Below the threshold, routine reporting doesn’t happen at all.

So the day-to-day activity of a normal account is not routinely visible. What changes that is an inquiry with your name on it — next section.

Can AT get my full transaction history, not just my balance?

Yes — under article 63.º-B of the LGT (Lei Geral Tributária), the AT can demand your complete account and transaction records directly from the bank, without a court order and without your consent. This is the derrogação do sigilo bancário — the lifting of bank secrecy — and it’s the mechanism behind every “they saw everything” story you’ve heard.

The key word is grounds. Article 63.º-B isn’t ambient surveillance; it activates when there are indications of a tax crime, or when what you’ve declared visibly fails to match reality (your declared income can’t support your documented spending, refunds look manufactured, an audit finds inconsistencies). Once opened, it is thorough — full statements, not summaries.

The honest way to hold both facts: routine visibility is narrow; investigative visibility is nearly total. The system is built to leave compliant people alone and to be very hard to hide from once attention arrives.

Does MB Way report my payments to Finanças?

There is no dedicated MB Way–to–AT reporting channel — the recurring freelancer fear of a “real-time MB Way feed” doesn’t match anything in the published legal framework. MB Way transfers settle into your ordinary bank account, so they’re covered by exactly the same two mechanisms as any other bank movement: the €50k year-end balance rule, and article 63.º-B if you personally come under inquiry.

That cuts both ways, and it’s worth saying plainly: MB Way isn’t a surveillance system, but it isn’t invisible income either. A client paying you through MB Way is money in your account like any other — if you’re issuing recibos verdes for it, nothing here should worry you; if you’re not, it’s sitting in the same account an article 63.º-B request would read.

How does e-fatura cross-check what I declare?

Automatically and continuously — this, not your bank account, is the AT’s real day-to-day visibility into a freelancer’s income. Every invoice and recibo issued under your NIF flows into e-Fatura, and the AT’s systems compare what was issued against what you declare. The mismatches surface as divergências — flags you can see yourself in the e-Fatura portal (Apoio ao Cumprimento → Divergências) and are asked to resolve.

This is why the classic under-declaration idea — invoice a client, declare less — fails immediately: the AT already holds a copy of the invoice, because your client’s accounting reported it too. The e-fatura system you use to claim deductions is the same pipeline the AT reads from the other side, and the quarterly Social Security declaration gets matched against the same issued-recibos record.

What if my declared income doesn’t match my spending?

This is the mechanism that catches what the invoice cross-check can’t: article 89.º-A LGT (“manifestações de fortuna”). If the AT identifies an asset increase, a purchase, or a standard of living that your declared income can’t explain, it can move to indirect assessment — taxing you on what your wealth pattern implies rather than what you declared.

The part that surprises people: once article 89.º-A engages, the burden of proof flips to you. It’s no longer the AT’s job to prove the money was undeclared income — it’s yours to prove it came from an already-taxed or non-taxable source (savings with a paper trail, a documented gift, a foreign inheritance properly reported). Undeclared cash income spent visibly is precisely the pattern this article exists to catch.

What’s the actual penalty for under-declaring income?

For omissions or inaccuracies in a declaration, the coima (fine) under RGIT article 119.º runs from €375 to €22,500, with where you land depending mostly on whether it reads as negligence or intent. Serious cases — larger amounts, fabricated documents — leave the coima regime entirely and become tax crime, which is a different article and a different kind of problem.

The system is deliberately gentle with self-correction: file a declaração de substituição within the normal filing window and there’s no penalty at all; correct after the deadline and there’s still no coima if the fix doesn’t increase the tax due or reduce your refund. If you’ve spotted your own mistake, fixing it fast is dramatically cheaper than waiting to be asked. Our Modelo 3 guide covers the substitution mechanics.

How far back can the AT go?

Generally four years from the year the tax became due — article 45.º LGT gives the state that long to issue (and validly notify) an assessment, after which the right lapses (caducidade). Your 2022 income, in the normal case, became untouchable at the end of 2026.

The important exception: when the facts are connected to a criminal inquiry — tax fraud rather than a declaration error — the window extends until that process resolves. Four years protects the honest and the sloppy; it is not a waiting-out strategy for fraud.

Do foreign bank accounts get reported too?

Yes — and more comprehensively than domestic ones. Under the CRS/DAC automatic exchange framework (transposed by Decreto-Lei n.º 64/2016), financial institutions across the EU and most of the OECD report accounts held by Portuguese tax residents to their local authority, which forwards them to the AT — regardless of balance. The domestic €50k threshold does not apply; a €3,000 account in Germany or a US brokerage account is reportable under this framework.

If you have foreign accounts or income, the filing-side counterpart is Anexo J — and the practical rule is simple: the AT likely already receives word these accounts exist, so the only question is whether your declaration agrees with what arrives.

The honest summary

For a freelancer on recibos verdes declaring properly, the picture is genuinely unthreatening: your bank account is not being watched, MB Way is not a reporting channel, and the four-year clock runs quietly in your favour. The AT’s real-time visibility is your issued invoices — which you control, because you issue them.

What the system punishes is divergence between the life your money shows and the income your declarations claim. Every mechanism above — balance reporting, bank-secrecy derogation, divergências, wealth presumptions, international exchange — is a different instrument for noticing that same gap. Close the gap and the machinery has nothing to catch.

Sources

• Lei n.º 17/2019 — bank balance reporting above €50,000 (Diário da República)
• LGT artigo 63.º-B — access to bank information (Portal das Finanças)
• LGT artigo 89.º-A — manifestações de fortuna (Portal das Finanças)
• LGT artigo 45.º — caducidade do direito à liquidação (Portal das Finanças)
• Portal das Finanças — e-Fatura divergências FAQ
• RGIT — official consolidated text, art. 119.º (Portal das Finanças, PDF)
• Decreto-Lei n.º 64/2016 — CRS/DAC2 automatic exchange (Diário da República)