You’ve bought some bitcoins, you keep them on a platform or in a personal wallet, and then tax season approaches. The question quickly arises: do you need to declare bitcoin for taxes? The answer depends less on the amount you hold than on what you’ve done with your bitcoins and where they are stored.
For long-term investors, it’s easiest to separate two topics: declaring accounts held on certain platforms and declaring realized capital gains. Whether you’re a plumber, electrician, landscaper, mechanic, hairdresser, beautician, or renovation entrepreneur, the rule is the same: a few minutes of organization can prevent a rushed tax return.
Do you need to declare Bitcoin if you’re just holding it?
In general, simply holding Bitcoin without selling it does not, by itself, create an income tax liability. If you’ve bought BTC and are keeping it as a long-term investment, the rise or fall in its price is not taxed as long as you haven’t made a taxable sale.
In other words, seeing your portfolio value go from €2,000 to €8,000 isn’t enough to trigger taxation. There is no annual tax on “paper” capital gains. This is an essential difference from the impression daily market fluctuations can give: volatility is not a taxable event.
A personal wallet, also called a non-custodial wallet, does not need to be declared as a foreign account. You directly hold your keys, not an account opened with a platform. However, you must be able to trace the origin of your purchases, transfers, and sales. Keep your histories, statements, and supporting documents. These will save you time when you need to calculate a capital gain.
Bitcoin is also not, in principle, included in the base for the real estate wealth tax. However, be careful: this simple rule applies to classic holdings by a French tax resident individual. Professional activity, inheritance, donation, or company structures may require a different analysis.
Crypto accounts to declare, even without selling
The most commonly overlooked point concerns accounts opened with foreign service providers. If you hold a digital asset account on a platform based outside France, it generally must be declared, even if you haven’t made any sales and even if the account is empty on December 31.
This obligation applies to accounts opened, used, or closed during the year. The declaration is usually made with form 3916-bis, attached to your income tax return. The goal is not to tax your balance, but to inform the authorities of the account’s existence.
An account with a French provider does not normally fall under this specific declaration for foreign accounts. In practice, always check the country of the entity actually providing the service, not just the site’s language or displayed currency. A French interface does not automatically mean the company is based in France.
The rule is very concrete: you may not have sold any bitcoin, owe no capital gains, but still have a foreign account to declare. Forgetting this step can lead to penalties. It’s better to review your platforms once a year than to search through your emails at the last minute.
When does selling Bitcoin become taxable?
For individuals investing occasionally, a sale is generally taxable when you exchange your bitcoins for euros or another legal tender currency. Buying a good or paying for a service directly in Bitcoin can also be considered a taxable sale.
On the other hand, a crypto-to-crypto exchange is not, in itself, immediately taxed. Converting Bitcoin to a stablecoin or another cryptocurrency does not normally trigger taxation at the time of the exchange. This doesn’t mean the operation is consequence-free forever: the calculation will be taken into account during a future conversion to euros or when buying a good or service.
The threshold to know is €305. If your total taxable sales for the year do not exceed €305, the capital gain is exempt. This threshold applies to the total sales, not the profit made. For example, if you sell €400 of Bitcoin with a gain of €20, the threshold is exceeded: you must calculate and declare the transaction.
This distinction avoids a common mistake: waiting to have “big profits” before thinking about your tax return. For tax purposes, the amount of sales counts as much as the final capital gain.
How to calculate Bitcoin capital gains?
The taxation of digital assets does not always work as a simple purchase minus sale calculation for each fraction of bitcoin. For individuals, the method takes into account the overall value of your digital asset portfolio at the time of sale, as well as the total of your acquisition prices.
The formula may seem technical, but the idea is simple: when part of your portfolio is sold, a proportional part of its acquisition cost is deducted. You don’t have to arbitrarily decide you sold the “first” or “last” bitcoins you bought.
Let’s take a deliberately simplified case. You’ve invested a total of €5,000. On the day of your sale, your crypto portfolio is worth €10,000. You sell €1,000 of Bitcoin for euros. The acquisition cost share for this sale is €500. Your capital gain is therefore €500 before accounting for any fees.
Transaction fees are included in the calculation. Losses also count: a realized capital loss can, under certain conditions, be offset against capital gains of the same nature realized during the year, then carried forward. Again, keeping a clean history is more useful than reconstructing years of transactions from screenshots.
Which forms to fill out to declare Bitcoin?
When there are taxable sales, the detailed calculation of capital gains is generally done using form 2086. The result is then reported on the supplementary income tax return, often form 2042-C. Digital asset accounts held abroad are declared with form 3916-bis.
Titles, boxes, and online declaration processes may change. Before submitting, check the forms provided for the relevant year. The spring 2026 tax campaign covers income and transactions made in 2025.
The tax rate applied to capital gains on digital assets is, by default, the flat tax of 30%, made up of 12.8% income tax and 17.2% social contributions. In some cases, you can opt for the progressive income tax scale. This choice is global for certain types of capital income and is not decided solely based on your Bitcoin gains. If your situation is complex, compare both options with a professional.
The simple method to avoid forgetting anything
Don’t turn your Bitcoin declaration into a last-minute project. Once a quarter, or at least before tax season, gather the necessary information: platforms used, country of establishment, deposits, withdrawals, purchases, sales, fees, and the value of your portfolio at each conversion to euros.
Tracking tools can greatly reduce this workload by centralizing transactions and giving you a clear view of your exposure. A platform like Yapuka Holder can help you track your Bitcoin strategy and filter out market noise, but it does not replace your transaction history or personalized tax advice.
The right habit is not to check your BTC every day. It’s to always know where it’s held, what you’ve invested, and which operations may have tax consequences. This organization gives you more time for your long-term strategy and less stress when tax season arrives.