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Freedom251 › Blog › crypto tax

How Are Stablecoin-to-Stablecoin Swaps Taxed in France?

By Freedom251 Team · · 10 min read

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For an individual managing private assets under France’s occasional digital-asset regime, swapping one qualifying stablecoin for another without a cash balancing payment generally does not trigger immediate capital-gains tax. French tax doctrine treats the qualifying exchange as an intercalary transaction: tax is deferred until a later taxable disposal, and the exchange itself does not have to be reported as a disposal for that year. The result depends on the tokens’ legal classification, whether a soulte is involved, and whether the activity is private rather than commercial.

When a stablecoin swap is tax-deferred

Article 150 VH bis of the French General Tax Code excludes exchanges without a soulte between digital assets from the immediate taxable event under the occasional private-investor regime. A soulte is a cash balancing payment made as part of an exchange. The French tax administration’s official doctrine, BOFiP, says qualifying exchanges benefiting from this deferral do not give rise to a declaration for that year. BOFiP, BOI-RPPM-PVBMC-30-30, published April 23, 2024.

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BOFiP puts the reporting point directly: “Les échanges sans soulte entre actifs numériques, bénéficiant du sursis d’imposition prévu au A du II de l’article 150 VH bis du CGI, ne donnent pas lieu à déclaration.” In English, exchanges without a soulte between digital assets that benefit from the deferral under article 150 VH bis do not give rise to a declaration. This is a rule about the qualifying exchange as a disposal for that year; it is not a statement that a taxpayer has no other tax-return or account-reporting obligations.

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That means a swap such as qualifying stablecoin A for qualifying stablecoin B is generally not taxed immediately merely because the exchange changes which token you hold. It is not the same as a cash sale followed by a purchase: the deferred exchange does not reset the portfolio’s acquisition-cost calculation as though you had made a taxable cash disposal.

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The rule is conditional, not a blanket exemption for anything marketed as a stablecoin. The token must qualify as a digital asset under the applicable French rules, and the activity must fall within the private asset-management regime. The official materials do not establish the classification of any particular token, chain transaction, or taxpayer’s circumstances. BOFiP, BOI-RPPM-PVBMC-30-10.

What changes the treatment: a soulte, fees, or token status

A swap with a soulte

A swap that includes a cash balancing payment is not the uncomplicated no-soulte exchange covered by the deferral. The disposal-price calculation can take account of a soulte received or paid, so do not assume that adding cash to a token-for-token exchange leaves the tax treatment unchanged. The precise calculation depends on the transaction’s facts and the applicable rules. BOFiP, BOI-RPPM-PVBMC-30-20.

For example, the relevant distinction is not simply whether the user receives two tokens or one. Ask whether the exchange includes a cash balancing payment alongside the asset exchange. A no-soulte swap may fall within deferral if the other conditions are met; a transaction with a soulte needs a separate assessment of the disposal price and calculation. Available official guidance does not support treating every payment associated with a trade as a soulte, or deciding the treatment of a particular payment without its facts.

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Platform and miner fees

BOFiP describes an administrative tolerance under which platform transaction fees and miner validation fees associated with an otherwise qualifying no-soulte exchange receive the same deferral. This is a limited treatment tied to fees for that kind of exchange; it should not be generalized to unrelated transactions or charges. Keep records that distinguish the exchange, any cash balancing payment, and the associated fees. BOFiP, BOI-RPPM-PVBMC-30-20.

Whether the token qualifies

The legal classification of the asset matters more than the label used by an issuer or trading platform. French guidance defines digital assets broadly, but the cited sources do not decide whether a particular stablecoin qualifies. For a token whose status is uncertain, avoid treating its marketing description as a tax determination.

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How France calculates gain on a later taxable disposal

When a taxable disposal eventually occurs under the occasional private-investor regime, the calculation uses the taxpayer’s overall digital-asset portfolio. It is not simply the apparent increase in value of the particular stablecoin sold. The official gross gain-or-loss formula is:

Gross gain or loss = disposal price − (total acquisition price of the digital-asset portfolio × disposal price ÷ global portfolio value at disposal)

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The formula allocates a portion of the portfolio’s total acquisition cost to the taxable disposal according to the disposal price and the portfolio’s global value at that time. The disposal price and relevant consideration are determined under the official rules; the calculation can account for a soulte and documented disposal costs. A qualifying no-soulte exchange remains deferred rather than being treated as a taxable cash sale that resets this calculation. BOFiP, BOI-RPPM-PVBMC-30-20.

In practical terms, keep portfolio-level acquisition and valuation records, not just a note of the price at which the stablecoin eventually sold. Records of token quantities, transaction dates, consideration, wallet or platform movements, fees, and portfolio value may be needed to substantiate the eventual calculation.

There are two values in the formula that are easy to conflate: the disposal price for the taxable transaction and the global value of the digital-asset portfolio at that time. The latter is used to apportion the portfolio’s total acquisition price; it is not merely the value or cost of the stablecoin being disposed of. This is why a later gain cannot reliably be worked out from a token’s purchase and sale prices alone.

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A useful recordkeeping sequence is to preserve the transaction history for each swap, note whether any cash balancing payment was made or received, and keep the records needed to establish portfolio acquisition cost and overall portfolio value at a later taxable disposal. Retain evidence of transaction and miner fees as well, while keeping in mind that the stated fee tolerance applies to fees associated with an otherwise qualifying no-soulte exchange. The cited guidance does not provide a universal recordkeeping template, but incomplete portfolio records can make the official calculation harder to substantiate.

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Reporting, the €305 threshold, and foreign-platform accounts

Report taxable disposals for the correct income year

For income earned in 2025, the French tax administration’s 2026 Form 2086 notice directs taxpayers with reportable digital-asset gains or losses to complete Form 2086 as an annex to the annual income-tax return. The resulting net gain or loss is carried to Form 2042-C; the administration’s explainer identifies box 3AN for a gain and box 3BN for a loss. Follow the instructions for the specific filing year, since forms and rates must be read in their stated year context. DGFiP, 2026 Form 2086 notice for income earned in 2025; DGFiP, digital-asset gains and losses explainer.

The distinction is between the deferred exchange and a later taxable disposal: the qualifying exchange itself is not reported as a disposal for that year under the cited BOFiP doctrine, while reportable taxable disposals follow the applicable annual return process. For the 2025 income-year instructions, that means Form 2086 and then the resulting net amount on Form 2042-C. Do not infer from the no-declaration rule for the exchange that a later disposal, or a separate account declaration, can be omitted.

Understand what the €305 figure measures

For income earned in 2025, the 2026 Form 2086 notice describes an exemption where the sum of relevant disposal prices for the year does not exceed €305. The total excludes exchanges without a soulte. This is a threshold based on disposal prices, not on profit or net gain; do not compare €305 with the amount of gain alone. DGFiP, 2026 Form 2086 notice for income earned in 2025.

In practical terms, a person checking the threshold should total the relevant disposal prices for the year rather than add up only gains or losses. Qualifying exchanges without a soulte are excluded from that total. The €305 figure cited here is specifically from the 2026 notice for income earned in 2025, so it should not be presented as an all-years threshold without checking the instructions for the income year being filed.

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Foreign-platform account declarations are separate

The tax administration separately requires individuals holding a digital-asset account on a foreign platform to declare that account. This account-reporting obligation is distinct from whether a particular qualifying no-soulte swap is immediately taxable: a deferred exchange does not, by itself, erase a separate account-declaration requirement. Check the applicable annual return instructions for the account-reporting procedure. DGFiP, digital-asset gains and losses explainer.

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Which regime applies: private investing or commercial activity?

The deferral described here is for individuals managing private assets under the occasional digital-asset disposal regime. The French tax administration says commercial buying and selling may instead be taxed under business-profit rules. Whether a person’s activity is commercial depends on the facts; frequency, organization, and circumstances should not be reduced to a single rule based on the fact that the person trades crypto. BOFiP, BOI-RPPM-PVBMC-30-10.

If your activity may be professional or commercial, or a swap includes a soulte or an asset with uncertain classification, the general private-investor explanation is not enough to determine your liability. Those issues require analysis of the actual transactions and taxpayer status.

Rates depend on the filing year

Do not attach a tax rate to the no-soulte swap itself: the exchange is generally deferred under the qualifying private-investor rules. Rates become relevant when a taxable disposal produces a gain. For income earned in 2025, the DGFiP’s 2026 Form 2086 notice describes a 12.8% income-tax rate plus social levies and an express, irrevocable option for the progressive income-tax scale. Separately, the tax authority’s current public explainer states a 31.4% flat-tax total, comprising 12.8% income tax and 18.6% social levies. These statements refer to different source contexts; check the instructions and rate applicable to the actual filing year rather than treating either figure as timeless. DGFiP, 2026 Form 2086 notice for income earned in 2025; DGFiP, digital-asset gains and losses explainer.

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The rate descriptions should not be collapsed into a single unqualified number: the Form 2086 notice is expressly for 2025 income, while the public explainer states the current page’s PFU figures. If you are preparing a return for another year, verify that year’s notice and current guidance. The progressive-scale choice described by the 2026 notice is express and irrevocable, so it should not be portrayed as a casual or reversible selection.

Losses do not work like a general capital-loss carryforward

The tax administration says digital-asset losses cannot be offset against gains on other kinds of property and cannot be carried forward. If a taxable disposal produces a loss, report it according to the instructions for the relevant year; do not assume it can reduce a future year’s crypto gain or a gain from another asset category. DGFiP, digital-asset gains and losses explainer.

Frequently Asked Questions

Is swapping one stablecoin for another taxable in France?

For an individual managing private assets, a swap between qualifying digital assets without a soulte generally benefits from tax deferral under article 150 VH bis. It is not taxed immediately as a disposal, and BOFiP says a qualifying deferred exchange does not give rise to a declaration for that year. Token classification and the taxpayer’s status still matter.

Do I have to report a no-soulte stablecoin swap on my French tax return?

BOFiP says qualifying exchanges without a soulte that benefit from deferral do not give rise to a declaration as a disposal for that year. That does not remove separate obligations, such as declaring a digital-asset account held on a foreign platform, or reporting a later taxable disposal under the instructions for its income year.

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What is a soulte, and why does it matter?

A soulte is a cash balancing payment made as part of an exchange. An exchange that includes one is not the uncomplicated no-soulte transaction covered by the deferral. The disposal-price calculation can account for a soulte received or paid, so the facts need to be assessed rather than assuming the usual deferral applies unchanged.

Does the €305 threshold apply to my profit or to the amount I sold?

For income earned in 2025, the 2026 Form 2086 notice describes the threshold by reference to the sum of relevant disposal prices for the year, excluding exchanges without a soulte. It is not a threshold for profit or net gain. Check the notice for the year you are filing.

How is the gain calculated when I later dispose of stablecoins?

Under the occasional private-investor regime, the official gross gain-or-loss formula uses the disposal price and allocates part of the total acquisition price of the digital-asset portfolio according to the global portfolio value at the time of the taxable disposal. It is therefore not necessarily the apparent gain on the particular stablecoin alone. Keep portfolio-level acquisition and valuation records.

Do stablecoin swaps qualify automatically, and does the rule cover professional trading?

No. A stablecoin’s marketing label alone does not establish that it qualifies as a digital asset for these rules. The described deferral is for private asset management under the occasional regime; the tax authority says commercial buying and selling may instead be taxed under business-profit rules. Specific token classification and taxpayer status require case-specific analysis.

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The Bottom Line

Bottom line: In France, an individual managing private assets can generally defer tax on an exchange between qualifying stablecoins when no soulte is paid or received. The swap is not itself reported as a disposal for that year under BOFiP’s doctrine, but a later taxable disposal is calculated using the overall digital-asset portfolio. Check token status, cash balancing payments, private-versus-commercial status, and the return instructions and rates for the relevant income year.

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