The tax administration requires cryptocurrency holders to report their winnings along with their other income in the annual return. Gains made from digital assets are subject to the "flat tax", the single flat-rate levy at the rate of 30%.

For the 2021 declaration, it is for tax residents in France to declare the capital gains on year N-1, i.e. those realized from January 1, 2020. "The mere holding of cryptocurrency does not trigger the payment of a tax" wishes to specify in advance ambule Stéphanie Némarq-Attias, tax lawyer at CMS Francis Lefebvre. Only the realized gains are therefore to be taken into account.
Bitcoins left on a digital wallet are not taken into account in the calculation of the tax. In addition, simple exchanges between cryptocurrencies, for example between bitcoin and ether, are also not subject to tax. "Unlike exchanges for national currencies, goods or services, there is no taxation on exchanges between cryptocurrencies" summarizes Stéphanie Némarq-Attias.
All sales, disposals or purchases of goods and services made with cryptocurrencies are subject to tax. "As soon as liquidity is released and cryptocurrencies are exchanged for money, the capital gain becomes taxable," explains the tax lawyer. For a sale, the taxable gain represents the difference between the purchase price of a bitcoin and its selling price. However, taxpayers are exempt from capital gains tax when the sum of the transfer prices is less than EUR 305 per household during the year.