Tax fraud in Portugal: penalties, thresholds and how to fix errors

Last reviewed: November 2026 · Reviewed by Stéphane Gombauld, tax expert, technologist and digital nomad

You file in Portugal, or soon will, and want to know where an honest mistake ends and a tax crime begins. After reading this, you'll know the 2026 thresholds and what each offence costs. You'll also see how far back the tax office can go, and how to fix an error cheaply.

Portugal tax fraud regulations in 2026: the key figures

What changed for 2026

• Crypto reporting starts. Under DAC8, EU crypto platforms collect data on your 2026 transactions. The European Commission says the first exchanges take place by 30 September 2027.
• The penalty rules themselves are unchanged. The RGIT thresholds above are the same as in 2025. The spontaneous-correction rule has stood in its current form since 1 January 2022 (Law 7/2021).
• Lower IRS rates mean smaller "advantages". Decree-Law 212/2026 cut the first six IRS rates for all 2026 income, from 1 January (12.2% to 48%, top rate above €86,634). The fraud threshold is measured in tax avoided, not income hidden, so the same omission now produces slightly less tax at stake.

Is this guide for you?

Read on if you…

• freelance or run a company in Portugal and want to stay on the right side of the rules;
• hold foreign bank, broker or crypto accounts as a Portuguese resident;
• found an error in a past return and want to know what fixing it costs.

Probably not your case if you…

• are already under criminal investigation – you need a criminal tax lawyer, not a guide;
• have never been resident and have no Portuguese income or property.

How does Portugal separate mistakes from crimes?

Portuguese law runs two tracks under the RGIT (Regime Geral das Infrações Tributárias, General Regime for Tax Offences, Law 15/2001).

1. Administrative offences (contraordenações): late filing, late payment, errors, missing records. The tax authority, the AT (Autoridade Tributária e Aduaneira), sets the fine.
2. Tax crimes (crimes tributários): fraud, qualified fraud, breach of trust. These go to the Public Prosecutor and the criminal courts.

The dividing line is intent plus amount. An honest error is an offence. Deliberately hiding income to avoid €15,000 or more of tax is a crime.

How the AT spots problems

In practice, the AT sees much of your financial life before you file. Invoices issued in Portugal carry your tax number (NIF) and are reported to the AT. Foreign banks and brokers report accounts of Portuguese residents through automatic exchange. Crypto platforms join from 2026 under DAC8.

Residence is the trigger. Once you're resident under art. 16 CIRS, you're taxed on worldwide income. Check when that starts in tax residency in Portugal.

What counts as tax fraud in Portugal?

Under article 103 RGIT, fraud is unlawful conduct aimed at not paying tax, or at obtaining undue benefits or refunds. The law lists three forms:

• hiding or altering facts or amounts in your books or returns;
• hiding facts or amounts you must disclose to the AT;
• a simulated transaction, faking its value, its nature or the people involved.

Here's the catch. The amount that counts is the advantage per return, not your total income. Below €15,000, the same conduct is not a crime, but it is still a fineable offence.

When fraud becomes "qualified"

Article 104 RGIT raises the penalty to 1–5 years in three situations:

1. Two or more aggravating factors combine, such as collusion with third parties, falsified or destroyed books, or using people or entities in a low-tax jurisdiction;
2. False invoices – documents for transactions that never happened, or with wrong amounts or parties;
3. An advantage above €50,000.

Above €200,000 the range becomes 2–8 years for individuals.

Penalties at a glance

Breach of trust: the trap for employers and freelancers

Abuso de confiança catches anyone who collects money for the state and keeps it: VAT charged to clients, or tax withheld from salaries. Under article 105 RGIT, it's a crime above €7,500.

Good news: two conditions must both be met. More than 90 days must have passed since the payment deadline. And you must have failed to pay the declared amount, with interest and fine, within 30 days of being notified.

Social security fraud

Article 106 RGIT applies the same fraud penalties to social security when the advantage exceeds €7,500. Undeclared salaries are the classic case.

What do administrative offences cost?

Most people never get near a crime. The everyday risk is a fine.

On top, compensatory interest (juros compensatórios) runs on tax paid late through your fault. Article 35 LGT ties it to the legal interest rate. For an error in your own return, it runs for 180 days at most.

How self-correction slashes the fine

Article 30 RGIT gives you a right to a reduced fine:

1. Before any inspection, complaint or report: 12.5% of the legal minimum fine.
2. During an inspection, up to the deadline for your prior hearing: 50% of the legal minimum.

You must pay within 30 days of being notified of the reduced fine and fix the tax in the same period. In practice, you file a substitute return (declaração de substituição) on the Portal das Finanças.

Better still, article 29 RGIT waives the fine entirely when no tax revenue was lost, the error is fixed and you had a clean five-year record. Unpaid tax always counts as lost revenue, so the waiver mostly helps with late returns where nothing was due.

If you are already facing criminal charges, paying still helps. Under article 22 RGIT, paying the tax and surcharges by the final decision leads to a specially reduced penalty.

How far back can the Portuguese tax authority go?

Under article 45 LGT (General Tax Law):

• Normal rule: 4 years from the end of the tax year.
• 12 years for income linked to a blacklisted low-tax territory that you didn't declare, or for accounts at financial institutions outside the EU not disclosed in your IRS return.
• During a criminal inquiry: the period extends until the case closes, plus one year.

Tax crimes themselves lapse after 5 years under article 21 RGIT. Longer Penal Code periods apply where the maximum prison term is 5 years or more, as with qualified fraud.

Unexplained wealth

If your assets or spending don't match your declared income, the AT can assess income indirectly. Article 87 LGT covers unexplained increases or spending above €100,000. Such increases are taxed at a special 60% rate under article 72 CIRS. You get the chance to explain the source first.

What should expats and nomads watch out for?

• Special regimes: IFICI and IRS Jovem have conditions you must meet. Claiming a regime you don't qualify for means reassessment with interest and fines. See tax incentives for expats and digital nomads in Portugal.
• Foreign accounts: undisclosed non-EU accounts stretch the reassessment window to 12 years.
• Crypto: DAC8 data arrives from 2027 for 2026 activity. Check the rules in cryptocurrency taxes in Portugal.
• Paper departures: under art. 16(6) CIRS, Portuguese nationals moving to a blacklisted territory stay resident for that year and the next four, unless they prove a valid reason. Leave properly with the guide to ceasing Portuguese tax residency.
• Unpaid VAT: freelancers who charge VAT and keep it face breach of trust above €7,500.

Common mistakes (and what they cost)

• Waiting for the AT to find the error → the reduction drops from 12.5% to 50% of the minimum fine, or disappears entirely.
• Not disclosing non-EU accounts in your IRS return → the reassessment window grows from 4 to 12 years.
• Keeping VAT collected from clients → breach of trust above €7,500, up to 3 years' prison, or 1–5 years above €50,000.
• Using invoices for work that never happened → treated as qualified fraud under art. 104(2) RGIT, with 1–5 years' prison.
• A "paper" move abroad while your life stays in Portugal → reassessment as a resident on worldwide income, and possible fraud charges.

Frequently asked questions

When does tax evasion become a crime in Portugal?

Simple tax fraud is only punishable when the illegitimate advantage per return reaches €15,000, under article 103 RGIT. Below that, the same conduct is an administrative offence with a fine. For breach of trust, keeping withheld tax or collected VAT, the criminal threshold is €7,500, and only once 90 days have passed since the deadline.

What is the penalty for tax fraud in Portugal?

Simple fraud carries up to 3 years in prison or up to 360 day-fines. Qualified fraud, with false invoices, combined aggravating factors or an advantage above €50,000, carries 1 to 5 years. Above €200,000 it's 2 to 8 years. Companies face 240 to 1,920 day-fines. The tax and interest are always due as well.

How far back can the Portuguese tax authority audit?

Normally 4 years from the end of the tax year, under article 45 LGT. The window extends to 12 years for undeclared income linked to blacklisted territories, or for non-EU accounts missing from your IRS return. Tax crimes lapse after 5 years, or longer for offences punishable with 5 or more years.

How do I correct a mistake in my Portuguese tax return?

File a substitute return on the Portal das Finanças and pay the extra tax with interest. If you do it before any inspection, complaint or report, the fine falls to 12.5% of the legal minimum under article 30 RGIT. You must pay it within 30 days of notification. Keep proof of the date you corrected.

Does Portugal receive information about my foreign accounts?

Yes. Banks and brokers abroad report accounts of Portuguese residents through automatic exchange of information. From 2026, EU crypto platforms also collect data under DAC8, with the first exchanges by 30 September 2027. The AT compares this data with what you declared.

Can I go to prison for not paying VAT in Portugal?

In serious cases, yes. Keeping VAT you charged to clients is breach of trust under article 105 RGIT. Above €7,500 it carries up to 3 years, or 1 to 5 years above €50,000. It's only punishable if you don't pay the declared amount, interest and fine within 30 days of notification.

Related guides

• Portugal tax landscape overview
• Tax residency rules in Portugal
• Business expenses you can deduct in Portugal
• International tax treaties of Portugal
• Tax fraud rules in Malta compared
• Tax fraud regulations of Austria compared
• All country tax guides

Sources

• RGIT, article 103 – Fraude – Autoridade Tributária e Aduaneira
• RGIT, article 104 – Fraude qualificada – Autoridade Tributária e Aduaneira
• RGIT, article 105 – Abuso de confiança – Autoridade Tributária e Aduaneira
• RGIT, article 30 – Direito à redução das coimas – Autoridade Tributária e Aduaneira
• RGIT, article 119 – Omissões e inexatidões – Autoridade Tributária e Aduaneira
• LGT, article 45 – Caducidade do direito à liquidação – Autoridade Tributária e Aduaneira
• CIRS, article 68 – 2026 IRS rates – Autoridade Tributária e Aduaneira
• DAC8 – crypto-asset reporting – European Commission

This guide is general information, not personalised tax advice. See how we research and review.