Key figures — as of 2026-08-24: Portugal's Anexo J requires listing every foreign bank or investment account by NIF holder "mesmo que não tenham sido obtidos rendimentos" (even with no income earned) — official government guidance; Law No. 26/2026 (3 June 2026) transposes DAC8/CARF, putting crypto-asset service providers under automatic reporting duties from 1 January 2026; the first cross-border exchange of 2026 crypto data reaches tax authorities by 30 September 2027; crypto gains held under 365 days remain taxed at 28%, ≥365 days tax-free — but the transaction still has to appear on the return.
The rule nobody reads until it bites
The single most consequential detail buried in Portugal's tax code this year isn't a new rate — it's a disclosure obligation that has nothing to do with how much money you made. Official guidance from the Portuguese government is explicit: taxpayers must add Anexo J to their IRS return and identify the NIF holder of any foreign account even when no income has been obtained from it. A dormant UK savings account, an old US brokerage left untouched since before the move, a crypto wallet that sat flat all year — none of it is exempt just because the balance didn't move.
This isn't new legislation exactly; Anexo J has existed for years as part of the Modelo 3 return. What's changed is the enforcement infrastructure sitting behind it. Portugal has now formally transposed the EU's DAC8 directive and the OECD's Crypto-Asset Reporting Framework (CARF) into domestic law, meaning the assumption that a foreign or low-tax jurisdiction account stays invisible no longer holds.
What actually changed with Law 26/2026
Portugal published Law No. 26/2026 on 3 June 2026, implementing Council Directives 2023/2226 (DAC8) and 2025/872 (DAC9), and the legislation establishes a comprehensive framework for administrative cooperation in tax matters, with a particular focus on crypto-assets, aligning Portuguese legislation with the OECD's Crypto-Asset Reporting Framework and Common Reporting Standard. Crypto-asset service providers — exchanges, wallet operators, trading platforms — now have to collect and hand over user transaction data to the Autoridade Tributária, and the first reporting cycle for crypto-asset information will cover the 2026 calendar year.
At EU level, the mechanics are already locked in: the exchanges relating to the first reporting year (2026) will take place by 30 September 2027. On the tax return itself, crypto disposals get filed the same way any other capital gain does — Portuguese taxpayers must file crypto transactions in their annual Modelo 3 return through the Portal das Finanças, with Annex G covering short-term gains taxed at 28% and Annex G1 for long-term gains that qualify for exemption. Crucially, the exemption doesn't remove the filing duty — as one industry guide to Portugal's crypto rules puts it, "Even zero-tax transactions require reporting".
Why "zero income" was never zero obligation
The confusion trips up a specific group: people who moved to Portugal with existing accounts abroad — inheritance savings in a home-country bank, a brokerage account from a previous job, a crypto wallet opened years before relocating — and reasonably assumed that if nothing was earned, nothing needed declaring. That assumption has always been technically wrong under Anexo J, but it went largely unpoliced while cross-border data sharing was patchy. DAC8 closes that gap specifically for crypto, adding to the Common Reporting Standard exchanges that have covered conventional bank accounts for years.
GrowIN's analysis: with the first CARF/DAC8 exchange covering 2026 transactions not landing on Portuguese desks until 30 September 2027, anyone who has been treating a dormant foreign account or wallet as invisible has roughly thirteen months from today to get their filing history in order before that data arrives automatically rather than by choice. Voluntary correction now, through a replacement or corrective declaration, is a materially different conversation with Finanças than being flagged after the fact.
As GrowIN Portugal Editorial puts it: dormant doesn't mean invisible — Portugal's tax authority now expects to see every foreign account and crypto wallet a resident holds, whether it earned a cent or not.
What to actually do
If you're a Portuguese tax resident, check whether Anexo J was completed correctly on your last return — it covers bank accounts, investment accounts, life insurance with a capital component, and now crypto holdings on foreign platforms. Non-compliance isn't primarily about the tax owed on a silent account; it's about the accuracy of the declaration itself, since Finanças increasingly cross-checks it against incoming CRS and CARF data. Anyone with meaningful crypto holdings should also start keeping acquisition dates and holding-period records now, since the 365-day exemption depends on being able to prove it.
None of this changes the core crypto tax rules from earlier this year, which our tax & NIF guide covers in detail. It does mean the paperwork side of "I didn't earn anything, so I didn't file" no longer holds up. Filing windows for 2026 income open on 1 April 2027; get professional advice on outstanding disclosures well before then, since retroactive corrections are far simpler than reactive ones.
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