Tax on Crypto Lending Income in France: What to Know in 2026
French tax residents who earn stablecoin interest from platforms like 8lends must declare that income annually. This guide outlines the general principles, the likely tax regimes, and the documentation you should keep. This is not tax advice - consult an expert-comptable or tax lawyer for personal guidance.
Not tax advice. French tax law is complex, changes frequently, and depends on your personal circumstances. This page provides general information only and should not be relied upon as advice. Consult a qualified expert-comptable or tax adviser before taking action.
Do I need to declare crypto lending income in France?
Yes. French tax residents are required to declare all worldwide income to the Direction generale des finances publiques. That includes interest or yield earned in cryptocurrencies or stablecoins such as USDC, even if the funds remain on a blockchain wallet or a platform like 8lends and have not been converted to euros.
The declaration obligation applies regardless of the size of the gain. There is no de minimis threshold that exempts small amounts of crypto income from reporting. If you earned USDC interest during the tax year, you must include it in your annual return.
Which tax regime applies to 8lends income?
The applicable regime depends primarily on whether your activity is classified as occasional investment or habitual professional trading. Most retail investors using 8lends on a personal basis fall into the occasional category, but the distinction is fact-specific and determined by the tax authorities or a tribunal if challenged.
Occasional investment: flat-rate capital-gains regime
If your crypto activity is infrequent and conducted for personal wealth management, income from platforms like 8lends is typically treated as a capital gain on digital assets and taxed under the prelevement forfaitaire unique, or flat tax. As of 2026, the combined flat rate is 30 percent, comprising 12.8 percent income tax and 17.2 percent social contributions.
Under this regime, you report the gain in your annual return and pay the flat rate on the net profit. Deductible expenses are limited - generally you may subtract acquisition costs and direct transaction fees, but ongoing platform fees or wallet costs are not always deductible in practice. Verify the current position with a professional.
One quirk of the French rules: interest or yield earned on crypto assets held for speculation may be taxed at the point the USDC is disposed of rather than when it is received, depending on how the gain is structured. If you leave the USDC on 8lends and compound it, the taxable event may be deferred until you withdraw or convert to fiat. This is an area of ongoing clarification by the administration - do not assume deferral is automatic.
Professional or habitual activity: progressive income tax
If you trade or lend crypto on a large scale, frequently, or with methods resembling a professional operation, the income may be classified as benefices non commerciaux and taxed as non-commercial profits. In that case, you are subject to the progressive income-tax scale, which ranges from zero to 45 percent depending on your total income, plus social contributions that can add another 17.2 percent or more.
Professional classification is more common for those who operate mining rigs, run arbitrage bots, or day-trade full-time. A retail investor passively earning interest on 8lends is unlikely to cross into this category, but there is no bright-line test. Factors the authorities consider include frequency of transactions, the amounts involved, whether you hold yourself out as offering a service, and the sophistication of your methods.
If you are classified as professional, you may be required to register for social security as a micro-entrepreneur or liberal profession, file quarterly or monthly returns, and pay advance instalments. This adds administrative burden and cost, which is why correct classification matters.
Documenting USDC income for French tax purposes
French tax law requires you to prove the amounts you declare. For stablecoin income, that means keeping records of every USDC payment you received from 8lends, the date it was paid, and the EUR-equivalent value on that date.
Use a consistent, verifiable exchange rate for each transaction. If 8lends or your wallet provider displays a EUR value at the time of the transaction, note it. If not, refer to a recognised exchange or price aggregator and document which source you used. The Banque de France does not publish daily USDC rates, so you must rely on commercial data - just be consistent and retain the evidence.
Keep records for at least six years from the end of the tax year in question, which is the minimum retention period under French law. Include wallet addresses, transaction hashes on the Base network, and any correspondence with the platform that shows the nature and timing of the income.
If you convert USDC to EUR or another currency, record the date and rate of that conversion as well. The capital-gains calculation may depend on the original acquisition cost of the USDC - if you bought it specifically to lend on 8lends, the purchase price forms your cost base. If you received it as income from another activity, the EUR value at the time you received it is generally the starting point for any subsequent gain or loss.
Social contributions and the combined tax burden
In addition to income tax, French residents typically owe contributions sociales on investment income and capital gains. The social-contribution rate is 17.2 percent as of 2026, broken down into CSG, CRDS and other levies. These apply on top of the 12.8 percent flat income tax under the prelevement forfaitaire unique, bringing the combined burden to 30 percent for occasional investors.
If you elect to be taxed under the progressive scale instead of the flat rate, you may still owe the 17.2 percent social contributions on the same base. In some cases, a portion of the CSG paid on investment income is deductible from the following year's taxable income, but the net effect is still a high effective rate for higher earners.
Professional traders classified under BNC face progressive income tax plus social contributions that can exceed the 17.2 percent rate depending on their overall income and the contribution regime they fall under. Consult an expert-comptable to model your specific situation.
What if I only earned a small amount?
French law does not exempt small crypto gains from reporting. Even if you earned only EUR 50-equivalent in USDC interest from 8lends during the year, you are legally required to declare it. In practice, the tax authorities focus enforcement on larger cases, but an undeclared gain of any size is technically a compliance failure that can result in penalties if discovered during an audit.
If the amount is modest and you are otherwise compliant, the risk of detection may be low - but the obligation remains. Many taxpayers choose to declare all income, however small, to avoid future complications, especially given the increasing exchange of information between jurisdictions and the blockchain's permanent record.
Does 8lends or Maclear AG report to French tax authorities?
As of publication, 8lends and its parent company Maclear AG do not publicly state that they report client income directly to French or other EU tax authorities under automatic-exchange-of-information regimes such as DAC8. Maclear is a Swiss entity registered under a Swiss AML self-regulatory organisation, not an EU-based financial institution, and 8lends operates as a decentralised protocol on the Base blockchain.
However, the absence of automatic reporting today does not mean your income is invisible. If you move USDC through a regulated exchange that does participate in FATCA or CRS, that exchange may report aggregate balances or large transactions to your home tax authority. Blockchain transactions are public and permanent - even if pseudonymous today, they can be traced if your wallet addresses are later linked to your identity through KYC at an exchange or other on-ramp.
The EU is actively developing a framework for crypto-asset service providers to report client holdings and transactions under DAC8, expected to apply from 2026 or shortly after. If 8lends or Maclear ever falls within scope - either because the rules expand to cover DeFi protocols or because the company registers for an EU licence - reporting obligations may commence. Plan for transparency rather than assuming permanent anonymity.
Filing your French tax return with crypto income
In your annual declaration, crypto gains are typically reported in the capital-gains section. For occasional investors, this means completing the relevant annex or schedule for digital-asset gains and entering the net profit figure. The exact form number and field can change - as of recent years, it has been included in a dedicated section of the main return or a supplementary form depending on the year.
If you are unsure which boxes to complete, consult the official guidance published by the Direction generale des finances publiques each tax season, or engage an accountant familiar with crypto. The authorities have issued several updates to the crypto-taxation framework in recent years, and the forms evolve to match.
Do not attempt to hide the income by omitting it or by claiming it is not taxable. The penalty for late or incorrect declaration can include interest and surcharges of up to 80 percent of the tax due in cases of deliberate evasion. Even an innocent mistake can trigger interest and a 10 percent penalty. Transparency and good-faith effort to comply are your best protection.
Next step: consult a professional
French tax law for crypto assets is still developing, and interpretations can vary depending on the specifics of your activity and the view of the local tax office. If you have earned significant income from 8lends or any other crypto platform, the prudent step is to consult an expert-comptable or fiscaliste who has experience with digital assets.
A professional can review your transaction history, classify your activity correctly, calculate the tax due, and file the return on your behalf. The cost of professional advice is typically deductible as a business expense if you are classified as a professional trader, and it is a worthwhile investment even for occasional investors to ensure compliance and peace of mind.
For a broader overview of how 8lends works and the risks involved, see the full safety review. Capital at risk - this is not investment advice.
Practical tip. If you plan to continue earning crypto income year after year, consider setting up a simple spreadsheet to log each transaction as it occurs. Record the date, USDC amount, EUR value and source. At year-end, you will have a complete record ready for your return, rather than scrambling to reconstruct six months of blockchain history.
Frequently asked questions
Yes. French tax residents must declare all income, including stablecoin interest earned on platforms like 8lends, in their annual tax return. The EUR-equivalent value of the income on the date it is received determines the taxable amount.
It depends on whether the activity is occasional or professional. Occasional investors typically fall under the flat-rate capital-gains regime, while habitual or professional activity may be treated as non-commercial profits subject to progressive income tax and social contributions. Consult an expert-comptable for a precise classification.
Keep transaction records showing the date, USDC amount, and EUR-equivalent value of each interest payment or withdrawal. Record the exchange rate used, ideally from a recognised source or the platform itself if it provides EUR conversions. Retain these records for at least six years.
Yes. In addition to income tax, French residents typically owe social contributions on capital gains and investment income. The combined rate can exceed 30 percent when the flat-rate regime applies. Professional activity may incur higher marginal rates plus additional social charges.