Declaring Foreign Crypto Accounts on Formulaire 3916-bis

Most French crypto content is about the flat tax and Formulaire 2086. Formulaire 3916-bis is a different obligation entirely, it is owed by many more people, and it is the one that produces penalties in years when no tax at all was due.

What it is

Formulaire 3916-bis is the declaration of digital asset accounts opened, held, used or closed abroad, filed alongside your annual income tax return. It is a reporting obligation, not a tax computation.

The essential point is independence. It is separate from your gains, and it is separate from Formulaire 2086. You can have made no disposal, owe nothing, and still be required to file it. Filing 2086 does not discharge it, and having nothing to declare on 2086 does not excuse it.

Who has to file it

The trigger is holding a digital asset account with a provider established abroad, as a French resident. That means the obligation catches a large proportion of ordinary French crypto users, because most major exchanges are not established in France.

Note the wording of the underlying obligation: accounts opened, held, used or closed during the year. An account you closed in March is still an account you held during the year, which is the detail people most often miss when they think in terms of current balances.

What is and is not an account

The distinction that matters is custody. An account with a provider that holds your assets is a digital asset account. A self custody wallet, where you hold your own keys and no provider is involved, is a different situation: there is no account with anyone.

Because the boundary can be fuzzy for hybrid products and for platforms whose legal establishment is not obvious from the interface, confirm your specific case with the DGFiP or a conseiller fiscal rather than reasoning by analogy from a forum post.

One per account

The declaration is made per account, not once for all of them. Someone who has used five exchanges over the years is dealing with five declarations, not one, and the penalty exposure scales with the number of accounts rather than with the amounts in them.

That per account structure is what makes this obligation disproportionately expensive relative to the tax it accompanies, and it is why the obligation is worth taking seriously even for accounts holding trivial balances.

The penalty is why this article exists

Failure to declare a foreign account carries a fixed penalty per undeclared account, applied irrespective of whether tax was due. A user with several dormant exchange accounts can face a total that far exceeds any tax on their actual gains. Confirm the current amount and the applicable periods with the DGFiP, since penalty provisions are set by law and change.

What to do

1. List every provider account you have ever used, including closed ones and ones with no balance. Current balance is not the test.
2. Establish which are established abroad. Where a platform is legally established is not always where its website suggests.
3. Prepare one declaration per account, with the identifying details of each.
4. File alongside your income tax return, in the same campaign.
5. Keep the list. The obligation recurs annually, and it is easier to maintain than to reconstruct.

And the gains are still separate

Remember that for private investors a taxable event only arises on conversion to fiat, spending crypto, or receiving crypto as income. Crypto to crypto exchanges are not taxable. Those disposals go on Formulaire 2086 and then Formulaire 2042 C, taxed under the flat tax at 30% on 2025 gains, with 2026 rising to approximately 31.4%, so verify for your year. None of that changes the 3916-bis obligation.

Our Formulaire 2086 guide covers the gains side, and French crypto tax covers the framework.

General information, not tax advice. Rules change and depend on your circumstances. Confirm the current position with the relevant tax authority or a qualified tax professional.

Practical Steps to Manage Your Crypto Reporting

When you are dealing with any tax reporting obligation, the first practical step is to gather every piece of information you might need. For crypto, that means compiling a complete list of every exchange or platform you have ever used, even if you no longer have an account with them. Do not rely on memory alone; check old emails, bank statements, and transaction histories. You should also note the dates when you opened and closed each account, as well as the provider's legal name and address. This information is essential for determining whether you need to file any forms. Keeping a dedicated folder, either physical or digital, for all crypto-related documents will save you time and stress when the reporting season arrives. It is also wise to update this folder regularly, perhaps monthly, rather than waiting until the last minute. By staying organized, you can avoid the panic of searching for missing details and ensure that you have a clear picture of your crypto activities for the year.

Identify What You Don't Know

Even with a complete list of your accounts, you may still have unanswered questions. For example, you might not be sure whether a particular platform is considered to be established abroad, or whether a specific type of wallet counts as an account. These are not trivial questions, and getting them wrong can lead to penalties. Instead of guessing, take the time to research the official guidance from the tax authority, if available, or consult a qualified tax professional. You should also be aware that the rules can change, so what was true last year may not be true this year. Make a list of any uncertainties you have and seek answers from reliable sources. Do not rely on advice from online forums or social media, as these are often inaccurate. A professional can help you interpret the rules as they apply to your specific situation. Remember, it is better to ask a question now than to face a penalty later.

Reconcile Your Records

Once you have gathered all your information, the next step is to reconcile it with the records you have. This means checking that the transactions you have recorded match the statements from your exchanges and wallets. Look for any discrepancies, such as missing transactions or incorrect amounts. This is also a good time to ensure that you have correctly identified which transactions are taxable events, such as selling crypto for fiat currency, and which are not, like transferring between your own wallets. Reconciling your records can be time-consuming, but it is essential for accurate reporting. If you find errors, correct them in your records and note any adjustments you made. This process will also help you answer questions about your crypto activity if the tax authority ever asks. By keeping your records consistent and up to date, you reduce the risk of mistakes and make the filing process smoother.

Document Your Assumptions

When you are preparing your tax return, you will likely have to make some assumptions. For example, you might assume that a particular platform is not considered a foreign account, or that a certain type of income is not taxable. It is crucial to document these assumptions and the reasoning behind them. Write down why you made each assumption, and keep any evidence that supports it, such as screenshots of the platform's terms or correspondence with customer support. This documentation will be invaluable if your return is ever reviewed or audited. It shows that you made a good-faith effort to comply with the rules. Additionally, if the rules change later, you can refer back to your documentation to understand what you did and why. Do not rely on verbal advice; get everything in writing. By documenting your assumptions, you protect yourself and make it easier to correct any mistakes in the future.

Review Before You File

Before you submit your tax return, take the time to review everything carefully. Check that you have included all required forms and that the information you provided is accurate. Look for any obvious errors, such as typos in account numbers or incorrect dates. It can be helpful to have someone else review your return, as they might spot mistakes you missed. Also, make sure you understand what you are signing and that you are comfortable with the information you are providing. If you are unsure about any aspect of your return, seek professional advice before filing. Once you file, it can be difficult to make changes, so it is better to be thorough upfront. Finally, remember that tax laws are complex and can change, so it is always wise to consult a qualified tax professional if you have any doubts. They can provide guidance tailored to your situation and help you avoid costly mistakes. Taking the time to review now can save you from headaches later.

Organizing Your Crypto Records for Tax Season

When preparing your crypto tax information, the first step is to gather every piece of data you might need. Start by listing all exchanges and wallets you have used, even those with zero balance or that you closed during the year. Check your email for account creation confirmations, withdrawal receipts, and any correspondence from platforms. Also review your bank and credit card statements for deposits or withdrawals linked to crypto purchases. Keep a dedicated folder, either physical or digital, for all crypto-related documents, including transaction history exports, cost basis records, and notes on any gifts or income received in crypto. Update this folder regularly, perhaps monthly, rather than waiting until the end of the year. This habit will save you time and reduce stress when you need to compile your records. Remember that exchanges may not keep your history indefinitely, so download your transaction history periodically and store it securely. If you use multiple platforms, consider consolidating your records into a single spreadsheet or accounting software to make reconciliation easier. The goal is to have a complete and organized trail of your crypto activities, which will make the reporting process smoother and help you avoid errors. Once you have gathered your records, the next step is to reconcile them. This means checking that the transactions in your records match the statements from each exchange or wallet. Look for any discrepancies, such as missing transactions, incorrect amounts, or duplicate entries. Pay special attention to transfers between your own wallets, as these are not taxable events but can cause confusion if not recorded properly. Also verify that you have correctly identified the date and value of each transaction in your local currency, as this is essential for calculating gains or losses. If you find errors, correct them in your records and note any adjustments you made. This process will help you ensure that your reported information is accurate and complete. If you have a large number of transactions, consider using a crypto tax software tool to automate the reconciliation, but always review the output for accuracy. Remember that the responsibility for accurate reporting lies with you, so take the time to verify your records thoroughly. During the preparation process, you will likely encounter situations where you need to make assumptions or interpret ambiguous information. For example, you might not be sure whether a particular airdrop is taxable income, or you might need to estimate the fair market value of a token on a date when it was not actively traded.