How to Declare Your Crypto Taxes in 2026
DAC8 changes everything. Learn the step-by-step process for declaring your crypto capital gains in 2026 and avoid the most common mistakes European investors make.
Written by Cheminaud Damien
Digital asset enthusiast
The DAC8 impact on your 2026 declaration
Starting in 2026, the DAC8 directive requires crypto exchanges operating in the EU to automatically report user transaction data to national tax authorities. This means your tax office will already have information about your trades before you file your return. Failing to declare accurately can trigger audits and penalties. Understanding DAC8 is no longer optional — it is essential for every crypto investor in Europe.
Step-by-step declaration process
First, gather your complete transaction history from Binance using an API export or Taxes Crypto. Second, calculate your capital gains using the official method for your country — PMPA in France, FIFO in Germany, Box 3 in the Netherlands. Third, transfer the calculated amounts to the correct tax forms. Fourth, declare any foreign exchange accounts. Fifth, keep records for the legally required retention period. Each step matters and skipping one can lead to errors.
Common mistakes to avoid
Failing to declare your accounts on foreign platforms is the first mistake. In France, form 3916-bis is mandatory as soon as an account has been opened or used on Binance, Coinbase, Kraken or any other exchange based outside France — €750 fine per undeclared account. Good news 2026: the amendment that would have extended this obligation to self-custody wallets (MetaMask, Ledger) above €5,000 was removed from the final text by the Joint Parliamentary Committee on April 28, 2026 — no specific declaration for non-custodial wallets. Another trap: confusing taxable and non-taxable crypto-to-crypto swaps depending on your country. Finally, forgetting staking or airdrop income can lead to a tax reassessment.
How Taxes Crypto simplifies your declaration
Taxes Crypto automates the entire process. Connect your Binance account with a read-only API key, let the engine import and calculate your capital gains using the correct method, then download your professional PDF report with amounts ready to declare. No spreadsheets, no manual calculations, no guesswork. The platform is already designed for DAC8 compliance so your 2026 declaration is covered.
Common mistakes to avoid when filing
Forgetting to report crypto-to-crypto exchanges, not including airdrops or staking rewards, using the wrong calculation method (PMPA instead of FIFO or vice versa), omitting transactions on DeFi platforms... Mistakes are numerous and can lead to significant penalties. In France for example, an omission can cost up to 750 EUR per undeclared account (form 3916-bis). The best protection is to use an automated tool that captures all your transactions without exception.
Crypto tax calendar 2026: key dates by country
Each European country has its own tax deadlines. In France, income tax returns are filed between April and June. In Germany, the deadline is July 31 (or end of February the following year with a tax advisor). In Italy, the Modello 730 is due by end of September. In Spain, the Modelo 100 must be filed between April and June. It's crucial to prepare your crypto documents well before these dates.
Practical cases: concrete filing examples
Let's take an example: you bought 1 BTC at 25,000 EUR in January 2025, then sold 0.5 BTC for 20,000 EUR in November 2025. In France (PMPA method), your capital gain is calculated on the weighted average cost of your entire portfolio, not just this BTC. If your total portfolio was worth 50,000 EUR for a total cost of 30,000 EUR, the gain on the 20,000 EUR sale would be: 20,000 x (1 - 30,000/50,000) = 8,000 EUR, taxed at 30% = 2,400 EUR.
Preparing for the future: DAC8 and automatic reporting
From 2026, the European DAC8 directive requires centralized platforms to transmit transaction data directly to tax authorities. In practice, your tax authority will know exactly how much you've traded. It's therefore essential to file correctly now. Taxes Crypto lets you verify that your filings match the data platforms will transmit, avoiding unpleasant surprises during an audit.
Official legal sources
This article is provided for informational purposes only and does not constitute tax, legal, or financial advice. Consult a qualified professional for your personal situation.
Cheminaud Damien
Digital asset enthusiast
Cheminaud Damien is a digital asset enthusiast. He built Taxes Crypto to help European investors calculate and report their cryptocurrencies, drawing on each country's official tax sources. His content is for informational purposes only and does not constitute professional tax advice.
Digital assets · Taxation · DAC8 · MiCA
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