For a French tax resident managing crypto-assets as a private individual, a crypto-to-crypto exchange without a cash or other balancing payment (a soulte) is generally tax-deferred: it is not itself a taxable disposal to enter on Form 2086. Keep its records anyway. They help reconstruct what you acquired, the history and value of your portfolio, and the figures needed when you later make a taxable disposal.
For each transaction, preserve enough evidence to identify the date, assets and quantities exchanged, consideration, fees, and where the assets went. For each taxable disposal, also retain records supporting the total acquisition cost and the value of your entire crypto-asset portfolio at that time—not just the asset sold or the account used.
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When a crypto swap matters for French tax
French tax treatment depends on what you receive and whether the exchange includes a balancing payment. Under the Direction générale des Finances publiques (DGFiP) guidance for private investors, exchanging one digital asset for another without a soulte is an intermediary operation: tax on the gain is deferred rather than triggered by that exchange alone.
A disposal can be taxable when you exchange crypto-assets for legal tender, goods other than digital assets, or services, or when an exchange between digital assets includes a soulte. This is why swap records should show what was given and received and whether any cash or other balancing consideration changed hands. The blanket claim that every crypto-to-crypto swap is taxable is not accurate for private investors under this rule.
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Tax deferral does not make a swap irrelevant to your records. Its transaction history can help establish the assets you hold and support the portfolio information used to calculate a later taxable disposal. Keep a clear record even when no Form 2086 event arises at the time of the swap.
Build a record set that can be reconstructed
The official Form 2086 materials specify return information and calculation inputs, not an exhaustive record-retention checklist. The following is a practical evidence file derived from those inputs. The goal is to be able to reconcile source records to the figures on your return and explain how you arrived at them.
| Record group | Keep | What it helps establish |
|---|---|---|
| Exchange or broker activity | Dated transaction exports, trade confirmations, deposits, withdrawals, fees, and account statements. Note the platform, account, and asset identifiers. | What happened on a platform and how its activity fits the rest of your transaction history. |
| Wallet and on-chain activity | Wallet addresses under your control, transaction hashes, dates and times, token quantities, and records of transfers between your own wallets. | Where assets moved and whether a transaction was a transfer within your holdings rather than a disposal to another party. |
| Swap details | Assets and quantities sent and received, timestamp, transaction or order ID, platform or protocol, quoted values and currency, fees, and any cash or other soulte paid or received. | The nature of the exchange, its consideration, and the facts relevant to whether tax deferral may apply. |
| Acquisition history | Purchase confirmations, acquisition dates and prices, and records of relevant acquisition costs for assets that affect your portfolio’s total acquisition cost. | The acquisition-cost input used in the Form 2086 calculation. |
| Portfolio valuation evidence | At each taxable disposal, a dated snapshot or working paper showing the assets held, their values, valuation time and method, market or source used, units, and currency-conversion basis. | The global portfolio-value input at the time of disposal, across storage locations. |
| Return and calculation file | A copy of filed Form 2086 and the related 2042 or 2042-C declaration, plus workpapers showing how source data was reconciled to reported totals. | How the figures on the filed return were derived from transaction and valuation records. |
| Foreign account information | Provider and account details for qualifying crypto-asset accounts opened, held, used, or closed with a foreign provider. | The separate account-disclosure question for Form 3916/3916 bis, where required. |
How to document swaps and transfers
Record both sides of each swap
For each exchange, capture the quantity and identity of the asset leaving your control and the asset received. Include a timestamp, platform or protocol, transaction or order identifier, fees, and the quoted value and currency shown by the service or source you used. If a soulte was paid or received, record its amount, form, and direction. Keep the confirmation or transaction data that supports the entry rather than relying on a handwritten summary alone.
These details make it possible to distinguish a crypto-for-crypto exchange without a balancing payment from an exchange that may fall into the taxable category. Do not silently combine multiple swaps into one net figure if that would obscure what occurred or whether any balancing consideration was involved.
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Keep self-transfers distinguishable
When moving assets between wallets you control, preserve the sending and receiving addresses, timestamp, transaction hash, asset, quantity, and any network fee information available. Label the movement as a transfer between your own wallets in your working records, and retain evidence connecting both addresses to you where possible. A transfer should not be presumed to be a sale merely because it appears as an outgoing movement on one wallet or platform.
The cited official materials do not give a detailed checklist for documenting self-transfers. The practical objective is to make the movement traceable and distinguishable from a transfer to another person or a disposal. If you cannot establish that two addresses are yours, flag the transaction for review instead of forcing it into a category without supporting evidence.
Preserve source data as well as summaries
Download dated exports and confirmations while they are available, and keep transaction identifiers that let you connect an exchange record to an on-chain movement. A spreadsheet or other ledger can make the history easier to review, but it should not replace source records. Keep a copy independent of the platform account so that your evidence remains accessible if an account closes or its export options change.
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Why Form 2086 requires whole-portfolio records
For each relevant taxable disposal, the DGFiP’s Form 2086 notice calls for transaction information and uses three values: the disposal price, the total acquisition price of the digital-asset portfolio, and the global value of that portfolio at the time of disposal. The calculation is not limited to the token sold or the exchange account where you sold it.
The official formula is:
Gross gain or loss = disposal price − (total acquisition price of the digital-asset portfolio × disposal price ÷ global value of the portfolio)
In practical terms, the calculation allocates part of the portfolio’s overall acquisition cost to the disposal in proportion to its price relative to the global portfolio value. Keep evidence for both portfolio-wide inputs: the acquisition-cost history and a valuation of all digital assets held at the disposal time. Assets on exchanges, in self-custody, on personal servers, and in offline storage count toward the overall portfolio value described in the official materials.
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For a valuation snapshot, record the date and time used, the holdings and quantities included, each value and currency, the market or valuation source, and how you converted currencies if needed. Preserve the source material or calculation that lets you reproduce the total. If a value is estimated or a source is unavailable, identify the method and limitation in your workpapers rather than presenting an unsupported number as a precise market quote.
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Prepare the return for the correct income year
Use the Form 2086 vintage and instructions for the income year being reported. The DGFiP’s 2026 Form 2086 notice is labeled for 2025 income, and the authority’s page lists the 2026 form. Its notice says the details of each relevant disposal must be provided. Individual guidance directs taxpayers to report the annual result on Form 2086 and carry it to the relevant 2042-C line. Online and paper filing paths may differ, so follow the current filing interface and form instructions for your filing method.
Before filing, reconcile exchange exports, wallet activity, acquisitions, fees, and disposal-time portfolio snapshots. Investigate gaps such as an asset appearing in a wallet without a known acquisition record, an unmatched withdrawal, or a disposal for which you cannot reconstruct the whole-portfolio inputs. Preserve a workpaper explaining any correction, treatment, or unresolved discrepancy so the filed totals can be followed from the underlying evidence.
Understand the €305 threshold and the rate separately
DGFiP’s 2026 guidance describes an exemption when the sum of annual gross disposal prices does not exceed €305, excluding exchanges under tax deferral. The threshold concerns gross disposal prices, not the amount of gain, and it is not a €305 deduction from gains. If the annual sum exceeds €305, the exemption does not operate as a €305 allowance; the relevant gains are brought into the calculation under the stated rules. The 2026 income-tax brochure says Form 2086 details must still be supplied when the disposal-price total is below €305.
For that reason, retain disposal records and complete the required form details even in a year when the threshold may mean the disposals are exempt. Do not add deferred swaps to the annual gross disposal-price total as though they were taxable disposals under the same rule.
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DGFiP guidance updated on 17 July 2026 describes a 31.4% rate for private investors, comprising 12.8% income tax and 18.6% social contributions. Tax rates are time-sensitive: check the rule applicable to the particular income year you are reporting rather than carrying this figure forward automatically.
Keep foreign-account disclosures separate
A French resident may also have to declare qualifying crypto-asset accounts with a foreign provider using Form 3916/3916 bis. Preserve enough information to identify accounts opened, held, used, or closed abroad, including provider and account details. This account disclosure is separate from the Form 2086 gain calculation: a foreign-account form does not replace recording taxable disposals, and Form 2086 does not by itself answer whether a foreign account must be declared.
Know when private-investor guidance may not fit
This guidance concerns a private individual managing personal crypto-assets. DGFiP distinguishes that situation from commercial activity, which may be taxed as BIC, and professional-like activity, which may be taxed as BNC. Its guidance identifies numerous and sophisticated activity using methods similar to professional traders as relevant to professional-like status. Mining and staking income are also treated separately in the described guidance, with such income falling under BNC.
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If your trading is frequent and sophisticated, resembles professional trading, or includes mining, staking, or other non-disposal income, do not assume the private-investor Form 2086 treatment answers every tax question. Classification depends on the facts of the activity; seek advice suited to your circumstances if the private-asset framework may not apply.
Retention period and practical limits
The official materials described above do not state a specific retention period for these records. Keep the underlying files and calculations in an orderly, readable form, and check current French tax guidance for retention obligations that apply to your circumstances. This record list is a practical way to support the declared inputs, not an official exhaustive checklist or a substitute for individualized tax advice.
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