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- Tax, Live in Portugal
Exchange of Tax Information: How Portugal Shares and Receives Data on Your Accounts and Income
🌐 Three Ways Tax Information Travels
- Automatic exchange: information is sent every year, in bulk and in a standard format, without anyone asking — for example, the balances of your foreign bank accounts
- Exchange on request: the Portuguese tax authority asks another country for specific information about a specific taxpayer (or vice versa)
- Spontaneous exchange: a tax authority sends information it believes is relevant to another country, without being asked
Together, they mean that money and income abroad are increasingly visible to the tax authority of your country of residence.
🔁 Automatic Exchange: The Common Reporting Standard (CRS)
The CRS, developed by the OECD, is the global standard for automatic exchange of financial account information. More than 100 jurisdictions exchange data under it — including all EU countries, the UK, Switzerland, Canada, Australia, Brazil and many financial centres such as Jersey, Guernsey, the Cayman Islands and Singapore. Portugal has exchanged CRS information since 2017.
What banks and other financial institutions report about accounts held by residents of other countries:
- Name, address, tax number and date of birth of the account holder (and of controlling persons of certain entities)
- Account number and the balance at the end of the year
- Interest, dividends and other income paid into the account
- Gross proceeds from sales of financial assets
Portuguese financial institutions report to the tax authority by 31 July each year, and the data is then sent to your country of residence — and the same happens in reverse.
Not a CRS participant: the United States, which uses its own system (FATCA).
🇪🇺 Within the EU: The DAC Directives
EU countries exchange information under the Directive on Administrative Cooperation (DAC) and its amendments:
- DAC1: employment income, directors’ fees, pensions, life insurance and income from immovable property
- DAC2: financial accounts (the CRS within the EU)
- DAC3: cross-border tax rulings
- DAC4: country-by-country reports of large groups
- DAC5: tax authority access to anti-money-laundering information
- DAC6: potentially aggressive cross-border tax arrangements (in Portugal, Law 26/2020)
- DAC7: income earned through digital platforms — such as short-term rentals and sales of goods — reported since 2023
- DAC8: crypto-assets — transactions from 2026 onwards, transposed in Portugal by Law 26/2026
- DAC9: the Pillar Two global minimum tax returns of large groups
₿ Crypto: DAC8 and CARF
From 2026, crypto-asset service providers (exchanges, brokers, custodial wallet providers) must identify their users’ tax residence and report their transactions — purchases, sales, swaps and transfers — every year. In Portugal, the report is due by 31 May of the following year.
Outside the EU, many countries are adopting the equivalent OECD standard, the Crypto-Asset Reporting Framework (CARF). The era of “invisible” crypto is ending.
🇺🇸 FATCA: The United States
Under FATCA and the intergovernmental agreement between Portugal and the United States (signed in 2015), Portuguese banks identify US persons — including US citizens living in Portugal — and report their accounts to the Portuguese tax authority, which sends the data to the IRS. The agreement also provides for information on Portuguese residents’ US accounts to be sent to Portugal.
📩 Exchange on Request: Treaties and TIEAs
Double tax treaties: almost all of Portugal’s tax treaties include an exchange of information clause (based on Article 26 of the OECD Model). The tax authorities can exchange information that is foreseeably relevant to apply the treaty or their domestic tax laws:
- Requests must concern a specific taxpayer or group — “fishing expeditions” aren’t allowed
- In modern treaties, bank secrecy can’t be used to refuse information
- Information received is confidential and can only be used for tax purposes
Tax information exchange agreements (TIEAs): with jurisdictions where there’s no treaty, often low-tax territories. Portugal has TIEAs in force with Andorra, Bermuda, the Cayman Islands, Gibraltar, the Isle of Man, Jersey and Saint Lucia, and has signed agreements with Antigua and Barbuda, Belize, the British Virgin Islands, Dominica, Guernsey, Liberia, Saint Kitts and Nevis, and the Turks and Caicos Islands.
Multilateral Convention: Portugal is also a party to the OECD/Council of Europe Convention on Mutual Administrative Assistance in Tax Matters, which allows exchange on request, spontaneous and automatic exchange with more than 140 jurisdictions. Within the EU, requests can also be made under the DAC, with set deadlines for replying.
⚖️ Why It Matters in Portuguese Tax Law
Whether a country exchanges information with Portugal isn’t just about enforcement — several tax benefits depend on it:
- Crypto: the 365-day exclusion and the no-tax-on-swaps rule only apply with parties in the EU/EEA or in countries with a treaty or information exchange agreement
- Non-residents selling Portuguese shares: the exemption doesn’t apply to residents of countries without a treaty or information exchange
- Leaving Portugal: the exception to the whole-year residence rule depends on the new country exchanging information
- Tax havens: jurisdictions on Portugal’s list face 35% rates and longer audit periods
💡 Practical Tips
- Assume full transparency: declare foreign accounts in Annex J and foreign income every year.
- Keep your tax residence consistent across banks and platforms — they ask you to self-certify it.
- Forgot something? A voluntary replacement return costs much less than a correction after the tax authority receives the data.
- Check the countries where your banks, brokers and platforms are based.
🚀 Final Considerations
Between CRS, the EU’s DAC directives, FATCA, tax treaties and TIEAs, the Portuguese tax authority has access to a vast amount of information on residents’ foreign accounts, income and — from 2026 — crypto. For taxpayers, the best strategy is simple: declare correctly from the start.
📢 Expert Advice: When you move to Portugal, update your tax residence with every foreign bank and platform, and declare those accounts in your IRS return. Mismatches between reported data and your return are what trigger audits.
Have accounts or income abroad? Step Inside Portugal’s tax team can review your situation and make sure everything is correctly declared — find out more about our tax services here. ✨
This article is for general information only and doesn’t constitute tax or legal advice. It reflects the rules as of October 2026.
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