Does swapping one crypto for another trigger tax in Portugal?

Portugal wrote crypto into the personal income tax code in the 2023 State Budget, and the rule that surprises people most is this one: moving from one token to another is not the moment the bill appears.

The deferral in plain terms

Exchange crypto for crypto and no gain is realised for Portuguese tax purposes. It is deferred until you convert into fiat, or into consideration that is not itself crypto, and the cost you originally paid carries over to the token you now hold. Buy one ether for 2,000 euros, swap it for another token a year later when it is worth 5,000, and nothing is taxable that day. Sell that token for euros at 6,000 and the gain is measured against your original 2,000 euros.

The part nobody can answer cleanly

What a swap does to the 365 day holding clock is not settled. Portugal exempts a gain when the asset has been held for 365 days or more and taxes it at a flat 28 percent below that line, so whether the count restarts at the swap is worth real money on a large position. Published guidance from Portuguese practitioners does not line up here, and we have found no binding ruling from the Autoridade Tributaria that closes the question. We will not guess it for you. If a swap sits anywhere near your 365 day mark, that is a conversation with a Portuguese tax adviser before you press the button.

Staking, lending and mining run on different rules

1. Passive staking and lending rewards are Category E investment income, taxed at 28 percent when they arrive, not when you sell.
2. Mining and transaction validation are Category B business income, taxed under the freelance rules with social security on top.
3. Tokens that qualify as securities are taxed as securities whatever the holding period, so the 365 day exemption never reaches them.

You still have to declare it

Short term disposals go in Anexo G of the Modelo 3, exempt long term disposals in Anexo G1, and the return window runs from 1 April to 30 June of the following year. The exemption also depends on your counterparty being resident in the EU, the EEA, or a country with a tax information exchange agreement with Portugal, a condition no exchange statement mentions. Short term losses offset short term gains from the same year only and do not carry forward.

Keep a record lot by lot from your first transaction. Rebuilding three years of swaps from exchange exports in June, with the deadline at the end of that month, is the expensive way to learn this. The rates and the 365 day line have their own page: is crypto tax free in Portugal in 2026.