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For a French tax resident investing as a private individual, keep a record of every crypto swap—even when exchanging one digital asset for another without a balancing payment is tax-deferred and is not itself a taxable disposal to report on Form 2086. You will need transaction history to establish what you acquired and to reconstruct the full portfolio inputs for a later taxable disposal. Keep enough evidence to trace dates, assets, quantities, values, fees, and any cash or other balancing payment (a soulte).
First, distinguish a tax-deferred swap from a taxable disposal
Under the French tax guidance for private investors, exchanging digital assets without a soulte is an intermediary operation: the tax treatment is deferred, so that swap is not itself a taxable disposal to report on Form 2086. That does not make the transaction irrelevant to your records. The assets received become part of your subsequent transaction history, and the value and composition of the portfolio may matter when you later dispose of assets in a taxable transaction.
A disposal can be taxable when you exchange digital assets for legal tender, goods other than digital assets, or services. An exchange of digital assets that includes a soulte can also be taxable. Do not assume that every crypto-to-crypto trade is taxable—or that every trade between tokens is automatically tax-deferred. Record what each side gave and received, and whether any cash or other balancing payment changed hands. The Direction générale des Finances publiques (DGFiP) describes these distinctions in its guidance for individuals.
What the distinction means for your records
Capture swaps even if they do not go on Form 2086 as taxable disposals. A transaction history helps you show what entered or left the portfolio and distinguish a deferred exchange from a disposal involving money, goods, services, or a soulte. Preserve the underlying records rather than relying only on a year-end summary or a platform’s current account screen.
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Build a record set that can be reconciled
The French tax authority’s Form 2086 materials specify information and calculation inputs for relevant disposals; they do not prescribe an exhaustive record-retention checklist, a particular file format, software, or storage medium. The records below are a practical way to preserve evidence for those inputs. Keep source data in a form that lets you connect each transaction to the values and portfolio figures used in your return.
Exchange and broker activity
- Save dated transaction exports, trade confirmations, account statements, and records of deposits and withdrawals.
- Retain the platform and account identifiers, asset names or tickers, quantities, transaction or order IDs, and fees. Preserve the original export where possible so a later reconciliation does not depend on a manually transcribed summary.
- Keep records from every relevant account. A platform’s own balance is not necessarily the value of your overall digital-asset portfolio.
Wallet and on-chain activity
- Record wallet addresses under your control, transaction hashes, dates and times, assets, and quantities.
- Document transfers between your own wallets so that the movement can be identified as a transfer rather than presumed to be a sale. The cited official material does not give a detailed self-transfer checklist, so preserve the transaction evidence and enough context to explain the movement.
- Keep transaction records for self-custody as well as exchange-held assets. The Form 2086 portfolio calculation is not limited to assets on one platform.
Swap details and consideration
- For each swap, save the date and time, platform or protocol, transaction or order ID, assets and quantities given and received, and any quoted values and currency.
- Record fees and whether you paid or received cash or another balancing payment. These details help establish whether the transaction was an exchange without soulte or a potentially taxable exchange with one.
- Keep the confirmation or on-chain record that supports the entry, not just a calculated euro value. Preserve the valuation source and method used for any value you later rely on.
Acquisitions and portfolio history
- Retain purchase confirmations, acquisition dates, prices, and records of relevant acquisition costs for assets that affect the portfolio’s total acquisition price.
- Keep a history of quantities and balances across exchanges, personal servers, and offline storage. A snapshot or ledger should show the portfolio at the time of a taxable disposal, rather than only its value at year end.
- For each valuation, note its timestamp, method, market or source, units, and currency-conversion basis so you can reconstruct how you reached the figure.
Understand the Form 2086 calculation before organizing your files
Form 2086 uses the taxable disposal price together with the total acquisition price and global value of the overall digital-asset portfolio. In the 2026 Form 2086 notice for 2025 income, the DGFiP states the calculation in terms of the disposal price less the product of the portfolio’s total acquisition price and the ratio of the disposal price to the portfolio’s global value.
Expressed as a formula:
Gross gain or loss = disposal price − [total acquisition price of the digital-asset portfolio × disposal price ÷ global value of the portfolio]
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The calculation is portfolio-based, not limited to the token sold or the platform used for the disposal. The global value is assessed at the time of the taxable disposal and includes digital assets held across your storage locations. That is why a transaction export from one exchange alone cannot establish every input: you also need the acquisition history and evidence of the overall portfolio at the relevant time.
Link each figure to its evidence
- Disposal price: retain the transaction confirmation or other record of what you received in the taxable disposal, along with the date, quantity, and any relevant fee information.
- Total acquisition price: preserve the records supporting the overall portfolio’s acquisition cost, not just the purchase cost of the asset sold in that particular transaction.
- Global portfolio value: retain a time-specific snapshot and supporting valuation information for assets held across accounts and self-custody at the disposal time.
Keep the reconciliation or workpaper that connects raw transactions to the totals you enter. If you correct a classification, valuation, or imported transaction, preserve enough of the original data and explanation to show what changed and why.
Prepare the annual filing and keep a copy
Use the Form 2086 vintage and instructions for the income year being reported. The DGFiP lists a 2026 Form 2086 notice labeled for 2025 income; that does not mean a later year’s return should use the same form or line references. The notice calls for information about each relevant disposal. Follow the current form instructions and the filing interface for the year you are submitting, because the online and paper pathways can differ.
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- Reconcile the year’s activity. Bring exchange, broker, and wallet records together. Identify transfers between your own wallets and distinguish them from disposals, while retaining evidence that supports the classification.
- Identify relevant disposals. Separate exchanges without soulte from disposals for legal tender, goods, or services and exchanges involving a soulte. Use the applicable year’s official guidance if a transaction does not fit clearly into one category.
- Reconstruct the inputs for each taxable disposal. Preserve the disposal price, the total acquisition price of the portfolio, and its global value at the disposal time, with the supporting source records and valuation method.
- Complete Form 2086 and carry the result to the return. The DGFiP’s individual guidance directs taxpayers to report the annual total on Form 2086 and carry the result to the relevant 2042-C line. Confirm the current year’s form and online instructions rather than relying on an old line number or a saved interface path.
- Retain the filed record set. Save the submitted Form 2086, corresponding 2042/2042-C declaration, calculations, and reconciliation workpapers alongside the source transaction and valuation evidence.
Apply the €305 threshold carefully
The DGFiP’s 2026 guidance describes an exemption when the sum of annual gross disposal prices does not exceed €305, excluding exchanges covered by tax deferral. The threshold concerns gross disposal prices, not net gains, and it is not a €305 deduction from taxable gains. If the annual total exceeds €305, the exemption does not operate as an allowance that shelters the first €305; relevant gains are calculated 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. Keep the disposal records and calculation information even when you believe the threshold applies. The threshold and filing treatment described here are for the guidance identified for 2026; check the official instructions for the income year on your return.
Keep foreign-account information separately
A French resident may also need to disclose qualifying crypto-asset accounts opened, held, used, or closed with a foreign provider using Form 3916/3916 bis. This is a separate account-disclosure question, not part of the Form 2086 gain calculation. Keep the provider and account details needed to identify each relevant account, together with the dates or status information required by the current form. Do not assume that reporting a disposal on Form 2086 also completes a foreign-account declaration.
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Check whether private-investor rules fit your activity
This guidance is for a private individual managing personal assets. The DGFiP distinguishes that situation from commercial activity that may be taxed as BIC and professional-like activity that may be taxed as BNC. Its guidance identifies numerous and sophisticated activity using professional trader methods as relevant to professional-like classification. Mining and staking income also have separate treatment; the described guidance places such income under BNC.
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. Preserve records of the activity and seek advice suited to your facts if the classification is uncertain.
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No particular software, paper ledger, or device is prescribed in the cited official materials. Whatever method you use, it should make it possible to capture both exchange and self-custody activity, export dates, quantities, fees, and transaction identifiers, reconstruct portfolio values at taxable disposal times, and retain the underlying data independently of continued access to a platform account. Keep a clear distinction between imported source records and your own calculations, and retain corrections with an explanation rather than silently overwriting the source.
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The practical test is whether you can start with a line on Form 2086 and trace it back to the calculation, the portfolio snapshot, and the underlying transactions. If you cannot reconstruct those links, the file is not yet complete enough to support the figures you are reporting.
What the official materials do not specify
The Form 2086 materials identify return fields and calculation inputs, but they do not prescribe an exclusive record format or medium. The official material summarized here also does not establish a specific retention period. Keep a complete and usable record set, and verify any retention-period question against current French rules rather than assuming that a platform export or tax form alone is sufficient.
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