Deducting Crypto Losses in France: What Actually Works

French crypto taxation is unusually forgiving in one respect and unusually strict in another, and both features hit losses. The forgiving part is that crypto to crypto exchanges are not taxable. The strict part is that this cuts both ways: an exchange that is not a taxable gain is also not a deductible loss.

The feature that defines everything

For private investors, a taxable event only arises when you convert crypto into euros or another fiat currency, spend crypto on goods or services, or receive crypto as income. Crypto to crypto exchanges are not taxable, and neither is simply buying or holding. That is what distinguishes France from most of Europe.

Now read it from the loss side. Rotating from a collapsing token into a stablecoin, which feels like crystallising the loss, realises nothing for French tax purposes. You have moved between digital assets. The loss is still unrealised, and unrealised losses are not deductible.

This is the single most important thing for a French investor to understand about a bad year: the defensive move that felt like locking in the loss did not create anything you can use.

The global portfolio method changes the shape of a loss

France does not use simple FIFO. It applies a proportional method across the whole portfolio of digital assets, where each disposal is computed against the total acquisition price of the entire portfolio and its value.

The consequence is that you cannot select a losing position and dispose of it to generate a loss. Every disposal is measured against a portfolio-wide figure, so what you realise is a proportion of the whole rather than the result of a specific lot. That makes deliberate loss harvesting much harder here than in a jurisdiction with per lot identification.

The 305 euro threshold works in both directions

If your total annual disposals are 305 euros or less, gains are exempt. That is helpful in a small year, but note that it is a threshold on disposals rather than on gains, and an exemption is not a loss regime.

What the rate tells you about the value of a loss

A taxable disposal is subject to the flat tax, the prelevement forfaitaire unique, at 30% on 2025 gains, comprising 12.8% income tax and 17.2% social levies. For 2026 the social levy share increased, taking the overall rate to approximately 31.4%, so verify the rate applicable to your tax year. You may opt for the progressive income tax scale instead of the 12.8% component if your bracket is more favourable, with the social levies still due.

A loss is worth whatever it shelters, so the value of an unused loss depends on the rate in the year it is used, which is a reason to confirm the carry forward rules with the DGFiP or an adviser rather than assume them.

Formulaire 2086 is where losses become real

Disposals are declared on Formulaire 2086, with each disposal listed, and the result carried to Formulaire 2042 C. The listing requirement is the operative point: a loss you did not declare in its year is not sitting somewhere for you, and a year of net losses is exactly the year people skip because nothing appears to be owed.

What to do

1. Realise, if you intend to. Only a conversion to fiat or a spend is a taxable disposal. A swap into a stablecoin is not.
2. Declare the year even when it is negative, listing each disposal on Formulaire 2086.
3. Track the whole portfolio, because the proportional method needs total acquisition price and total value, not just the lot you sold.
4. Confirm the carry forward rules with the DGFiP or a conseiller fiscal before planning around them.
5. Check whether you are a private investor at all. Professional activity and mining fall under the BNC regime at the progressive scale up to 45%, where the loss rules are different.

Our Formulaire 2086 guide covers the declaration, 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 for Managing Crypto Losses

When you face a year with crypto losses, the first practical step is to organize your records with care. This means gathering every transaction that involves a disposal, which includes conversions to fiat currency, spending crypto on goods or services, and receiving crypto as income. For each transaction, note the date, the amount in crypto, the value in euros at the time, and the type of asset involved. Also, maintain a clear record of your entire portfolio's acquisition costs, because the proportional method used in France requires a portfolio-wide view rather than a per-lot approach. Without this comprehensive data, you cannot accurately compute your gains or losses. A simple spreadsheet can suffice, but ensure it is updated consistently. The goal is to have a complete and auditable trail that supports any figures you report. This organization also helps you identify any missing information, such as the original purchase price of an asset acquired years ago. If you lack such data, you may need to reconstruct it from exchange records or wallet histories. Taking this step early reduces stress later and ensures you are ready to address any questions that arise.

Identifying Unanswered Questions

Before you finalize any tax position, it is wise to list the questions you cannot answer with certainty. For instance, you might be unsure whether a particular transaction qualifies as a taxable disposal, such as a swap into a stablecoin or a transfer between your own wallets. These are not trivial points; they can significantly affect your tax outcome. Rather than guessing, write down each question and seek clarification from reliable sources. This could include consulting the official tax guidance, reading reputable commentary, or asking a qualified tax professional. The key is to avoid assuming that a loss is automatically usable or that a transaction is automatically non-taxable. By identifying your uncertainties early, you can address them methodically and avoid costly mistakes. Remember, the rules can be nuanced, and what seems intuitive may not align with the legal framework. Taking the time to clarify these points is an investment in your financial accuracy.

Reconciling Sources and Records

Once you have your records, the next step is to reconcile them with external sources. This means cross-checking your transaction history against exchange statements, wallet addresses, and any other records you have. Discrepancies can arise from missing transactions, incorrect values, or timing differences. For example, you might have a record of a sale but not the corresponding purchase, or the exchange might show a different amount due to fees. Reconciling these details ensures that your calculations are based on accurate data. It also helps you spot any transactions you may have overlooked, such as a small disposal that pushes you over a threshold. Additionally, if you use tax software, verify that it is pulling the correct data and applying the right method. Manual reconciliation might be tedious, but it is essential for confidence in your figures. If you find inconsistencies, investigate them promptly. This could involve contacting the exchange for clarification or reviewing your own notes. The goal is to have a single, coherent dataset that you can rely on for your tax reporting. This process also prepares you for any questions from the tax authority, as you can demonstrate that your figures are well-founded.

Documenting Assumptions and Decisions

When you make choices about how to treat certain transactions, document your reasoning. For instance, if you decide that a particular swap is not a taxable event, note why you reached that conclusion, citing the relevant principles. Similarly, if you use an estimated value for an asset because you lack the exact figure, record the basis for that estimate. This documentation is not just for your own benefit; it can be invaluable if your return is reviewed. It shows that you approached the matter thoughtfully and in good faith. It also helps you maintain consistency across years, as you can refer back to your previous decisions. Furthermore, if you later discover that an assumption was incorrect, you can trace the impact and make adjustments if necessary. Keep this documentation in a safe place, alongside your transaction records. It might include emails with advisers, notes from phone calls, or copies of relevant guidance. The more thorough you are, the easier it is to defend your position. Remember, the goal is not to create a paper trail for its own sake, but to ensure that your tax reporting is transparent and well-supported.

Reviewing Before Filing and Seeking Professional Help

Before you submit any tax declaration, take the time to review your entire position. This means checking that all disposals are included, that your calculations are correct, and that you have applied the right rules. It is easy to make errors, especially in a complex year with many transactions. A careful review can catch mistakes that might otherwise lead to penalties or missed opportunities. Consider preparing a summary of your total gains or losses and comparing it to your expectations. If something seems off, investigate before filing. Additionally, if you are uncertain about any aspect of your tax situation, do not hesitate to seek help from a qualified professional. A tax adviser or accountant with experience in crypto can provide clarity and ensure that you are meeting your obligations. They can also help you understand the implications of your choices and plan for the future. While there is a cost involved, it is often worth the peace of mind. Remember, the rules can change, and professional advice is tailored to your circumstances. Ultimately, the goal is to file accurately and confidently, knowing that you have done your due diligence. This approach minimizes risk and helps you manage your crypto tax affairs effectively.

Organizing Your Crypto Records

Before you even think about filing, the foundation of any sound tax position is meticulous record-keeping. Start by assembling every piece of evidence for each transaction you made during the year. This includes exchange statements, wallet addresses, transaction hashes, and any notes you took at the time. For every disposal, whether it was a sale to fiat, a purchase of goods, or a swap, record the date, the amount of crypto involved, the value in euros at that moment, and the type of asset. Do not rely on memory; the market moves quickly, and a figure that seemed obvious in March may be impossible to reconstruct in December. A simple spreadsheet can work, but ensure it is updated consistently and backed up. The goal is to have a complete, auditable trail that supports every number you report. This organization also helps you spot gaps, such as a missing purchase price for an asset acquired years ago. If you lack that data, you may need to reconstruct it from historical exchange rates or contact the exchange for records. Taking this step early reduces stress later and ensures you are ready to address any questions that arise. Remember, the burden of proof is on you, so a well-kept ledger is your best defense. It also makes the process of reconciling your records with external sources much smoother, as you can quickly cross-check your figures against official statements. In the end, the time you invest in organizing your records pays off in accuracy and peace of mind.