I’ve spent enough time around crypto communities to know that self-custody is more than a technical choice for a lot of people. It’s a statement. So when I saw French lawmakers quietly advancing a rule that would force anyone holding at least €100,000 in personal wallets to declare those holdings every year—or face fines that can reach €10,000—I paused. Not because the idea of tax reporting is shocking, but because of how it targets the exact wallets that sit outside exchanges. The proposal is still early, the budget process is already messy, and nothing is law yet. Still, the direction feels clear enough that it deserves a closer look.
What the French Proposal Actually Requires
The amendment that cleared the National Assembly’s Finance Committee would insert a new reporting obligation into France’s general tax code. Individuals whose self-custody digital assets are worth at least €100,000 on 31 December would have to declare that value to the tax authorities. The assets in question are those held outside regulated crypto service providers—hardware wallets, software wallets, paper wallets, or any other arrangement where the holder keeps the keys. Failure to file the declaration could trigger a penalty of up to €10,000.
Lawmakers who sponsored the text pointed to a parliamentary inquiry that examined how wealthy individuals are taxed. In 2021, cryptocurrency capital gains reportedly reached €3.5 billion while declared holdings sat at only €400 million. The two figures measure different things—one tracks profits from disposals, the other tracks assets people chose to report—but the gap was large enough to convince the sponsors that more visibility was needed. Their solution is an annual snapshot rather than a continuous monitoring system.
Self-Custody Versus Custodial Holdings
The distinction matters. Coins sitting on a regulated exchange already generate data that tax authorities can request. Self-custody positions do not. The proposal does not ban personal wallets or force anyone to move assets to a custodian. It simply asks qualifying holders to tell the tax office what those wallets contain at year-end. In practice, that means calculating the euro value of every token, stablecoin, and perhaps even certain NFTs that the person controls directly.
I’ve found that many long-term holders treat their hardware wallets as a form of digital real estate. They rarely move the coins and they prefer not to leave large balances on platforms. A reporting rule that singles out exactly those balances changes the cost-benefit calculation. Some people will comply. Others may split holdings across multiple wallets or keep values just under the threshold. A few will simply leave France. All three responses have appeared in other countries once similar rules were proposed.
How the Threshold and Timing Work
The €100,000 figure is measured on a single date—31 December. That creates both simplicity and odd incentives. A wallet that spikes above the line on 30 December and drops back the next day still triggers the obligation. Conversely, someone who sells just before year-end and buys back in January can avoid the declaration for that year. Tax planners will notice these edges immediately.
The amendment was introduced by three members of the Liberties, Independents, Overseas and Territories group as part of the 2027 budget discussions. It is one of several crypto-related changes the Finance Committee examined. None of them has final parliamentary approval, and the committee later rejected the entire revenue section of the government’s draft budget by a wide margin. That means the amendments must be reintroduced and re-voted during full National Assembly debate. The political path is therefore longer and more uncertain than a simple committee vote suggests.
The gap between reported crypto gains and declared holdings was wide enough that lawmakers treated it as evidence of incomplete visibility rather than ordinary under-reporting.
Other Crypto Tax Changes Moving in Parallel
While the self-custody declaration drew the headlines, the same committee also backed several other measures. One would make conversions from cryptocurrencies into certain qualifying stablecoins taxable from 1 January 2027. Under current French rules, many crypto-to-crypto exchanges do not immediately trigger capital-gains tax. Changing that treatment for stablecoin conversions would force holders to recognize gains (or losses) when they move into euro-pegged tokens.
Another amendment would extend the period during which qualifying trading losses can be carried forward and offset against future gains, stretching the window to ten years. France already allows some loss relief; the proposal simply lengthens the useful life of those losses. A third measure looks at an exit tax on unrealized gains for people who relocate their tax residence abroad and hold more than €800,000 in crypto. France already applies exit taxes to certain traditional financial assets. Extending the concept to digital assets would close what some lawmakers see as a relocation loophole.
- Annual declaration for self-custody holdings of €100,000 or more
- Possible taxation of crypto-to-stablecoin conversions starting 2027
- Ten-year carry-forward window for certain trading losses
- Exit tax targeting large crypto positions when tax residence changes
None of these texts is guaranteed to survive the next stage of debate. The Finance Committee’s rejection of the revenue section means the government’s original draft becomes the starting point when the National Assembly takes up the budget. Amendments must be tabled again and win fresh votes. That procedural detail is easy to overlook, yet it determines whether any of the crypto proposals actually reach the statute book.
The Broader European Context
France is not operating in isolation. The European Union’s DAC8 framework already requires crypto service providers to collect and share customer and transaction data. Reporting under DAC8 began for activity in 2026, with the first exchanges of information expected in 2027. Transfers that touch self-custody wallets are captured when they pass through a covered provider. The new French proposal would go further by asking individuals themselves to report the balances that never touch those providers.
Some French crypto companies challenged the national decree that implements DAC8. They argued that centralizing personal data creates security risks. An emergency request to suspend the decree was rejected by the Council of State, though a separate challenge on the merits continues. The episode illustrates the tension between tax authorities’ desire for more data and the privacy and security concerns that many crypto users treat as non-negotiable.
Analytics firms have tried to quantify the scale of potentially taxable French crypto activity. One widely cited estimate put the figure near $9.4 billion for 2025 across several major chains, broken down into income, realized gains, and payments. Those numbers describe economic activity that could fall inside taxable categories; they do not equal unpaid tax. French taxpayers themselves declared roughly €368 million in cryptocurrency capital gains for 2024 through about 24,000 filings. The difference between estimated activity and declared gains is what keeps tax authorities interested.
Practical Effects for Holders
If the declaration rule eventually becomes law, anyone whose personal wallets cross the threshold will need a reliable way to value their holdings on 31 December. That sounds straightforward until you confront illiquid tokens, wrapped assets, or positions spread across several chains. Price feeds can disagree. Some tokens have almost no market. Tax authorities will expect a consistent methodology, yet the amendment itself does not spell out every valuation detail. Guidance would almost certainly follow, but early adopters of the rule would be working with incomplete instructions.
Record-keeping becomes more important. Screenshots of wallet balances, transaction histories, and notes on cost basis all help if questions arise later. People who already keep meticulous spreadsheets will adapt easily. Casual holders who simply “HODL and forget” may find the new paperwork burdensome enough to change behavior. I’ve spoken with several French residents who keep most of their long-term stack offline precisely to reduce platform risk. For them the compliance cost is not zero.
There is also the question of enforcement. A €10,000 fine is meaningful, yet proving that someone failed to declare a self-custody position is not trivial. Authorities would need either a tip, a cross-check with other data, or some other lead. The mere existence of the penalty can still shape behavior even if detection rates stay low. That is the classic logic of many tax rules: the risk of being caught is often enough to move the marginal holder into compliance.
Comparisons With Other Jurisdictions
Several countries already require residents to report foreign financial accounts or certain crypto positions. The French proposal is narrower—it targets only self-custody crypto above a specific euro amount—but the philosophy is similar. In places that have introduced comparable rules, initial compliance is often incomplete. Some holders restructure, some relocate, and a portion simply ignore the requirement until an audit arrives. Over time, data-sharing agreements and better analytics tend to raise detection rates.
Perhaps the most interesting aspect is how the proposal sits alongside France’s broader ambition to be a European hub for digital-asset activity. Attracting exchanges, funds, and developers usually requires predictable rules and competitive tax treatment. Adding a new reporting layer for large personal holdings sends a mixed signal. It may reduce perceived tax leakage, yet it also raises the friction of holding assets outside regulated venues. The net effect on France’s crypto ecosystem will depend on how the final text is written and how aggressively it is enforced.
| Measure | Status | Key Threshold or Date |
| Self-custody declaration | Committee approved, needs full vote | €100,000 on 31 Dec |
| Stablecoin conversion tax | Committee approved, needs full vote | From 1 Jan 2027 |
| Loss carry-forward extension | Committee approved, needs full vote | Up to 10 years |
| Crypto exit tax | Committee approved, needs full vote | Holdings over €800,000 |
The table above is only a snapshot of committee-level outcomes. Every item still has to clear the full parliamentary process. Political majorities can shift, and budget negotiations often produce last-minute compromises. Anyone planning multi-year tax strategy around these proposals should treat them as provisional until the final law is published.
Arguments For and Against the Rule
Supporters argue that large, undeclared self-custody positions undermine the fairness of the tax system. If capital gains are being realized and the underlying assets never appear in any report, ordinary taxpayers end up carrying a heavier load. The €100,000 threshold is high enough that most casual users would not be affected, while still capturing the holdings that generate the bulk of potential tax revenue. In that view, the fine is simply a proportionate deterrent.
Critics counter that the rule treats self-custody as inherently suspicious. They note that many people hold their own keys for security reasons after high-profile exchange failures. Adding an annual declaration creates a new database of sensitive information. Even if the data is well protected, the existence of the list increases the attack surface. There is also the practical difficulty of accurate year-end valuation for illiquid assets. A poorly designed rule could generate more disputes than revenue.
In my experience, the strongest objections come from people who already comply fully with existing capital-gains rules yet resent the extra paperwork attached to assets they control directly. They see the proposal as a shift from taxing transactions to monitoring balances. That philosophical difference is hard to bridge with technical amendments alone.
What Holders Can Do While the Text Is Still Unsettled
Because the amendment is not yet law, the immediate practical steps are limited. People whose holdings already exceed or approach €100,000 can start documenting cost basis and wallet balances more carefully. Those who plan to relocate can review how an eventual exit tax might interact with other countries’ rules. Anyone who regularly converts between volatile tokens and stablecoins should watch the parallel proposal that would change the tax treatment of those conversions.
Professional advice remains essential. Tax law is fact-specific, and the final wording of any statute can differ substantially from the committee text. What looks like a straightforward declaration requirement today could acquire exceptions, higher thresholds, or additional safe-harbors by the time it is enacted—or it could disappear entirely if political support fades.
- Track year-end values of every self-custody wallet with a consistent pricing source
- Maintain clear records of acquisition cost for each position
- Review the interaction between any new declaration and existing capital-gains filings
- Monitor parliamentary debate for changes to thresholds or effective dates
These steps are useful whether or not the specific amendment survives. Good record-keeping reduces stress under almost any future reporting regime. The people who will be least disrupted are those who already treat their crypto activity as part of ordinary financial administration rather than a purely private domain.
Longer-Term Implications for European Crypto Users
If France ultimately adopts the self-custody declaration, other member states will watch the results. Successful collection of additional revenue without massive capital flight could encourage similar measures elsewhere. Conversely, if compliance stays low and enforcement proves costly, the experiment may remain limited to France. Either outcome will influence how the next wave of EU digital-asset tax rules is designed.
Self-custody itself is unlikely to disappear. The security arguments that drove people toward hardware wallets after successive exchange collapses remain valid. What changes is the administrative overlay. Holders who once viewed their wallets as entirely outside the formal financial system will find that large balances now carry an explicit reporting duty. For some, that is an acceptable price of living inside a high-tax jurisdiction. For others, it becomes one more reason to consider residence elsewhere.
The political calendar adds another layer of uncertainty. Budget debates in France are rarely linear. Amendments that pass committee can still be dropped, rewritten, or traded away in later negotiations. The fact that the Finance Committee rejected the revenue section of the 2027 budget already demonstrates how fluid the process remains. Anyone reading headlines that treat the €10,000 fine as settled policy is getting ahead of the actual legislative timeline.
A Note on Valuation Challenges
Valuing a diversified self-custody portfolio on a single day is harder than it first appears. Major coins have deep markets and reliable price feeds. Smaller tokens, tokens with thin liquidity, or assets bridged across chains can produce widely different euro figures depending on the source chosen. Tax authorities will eventually publish acceptable methods, yet the first year of any new rule tends to generate clarifying questions. Holders who document their methodology in advance are better placed to defend it later.
Stablecoins introduce a different issue. Most track the euro or the dollar closely, so valuation is simple. If the parallel amendment that taxes conversions into certain stablecoins also passes, the decision to move into those tokens will itself become a taxable event. The interaction between the two rules could create planning opportunities—or traps—depending on the final drafting. Timing a conversion just before or after year-end might matter for both the declaration threshold and the recognition of gains.
Perhaps the cleanest approach for many people will be to treat the 31 December snapshot as a formal exercise rather than an afterthought. Export wallet balances, apply a documented price source, calculate the euro total, and file the declaration if the figure exceeds the threshold. The process is mechanical once the data is organized. The difficulty lies in organizing the data in the first place.
Looking Ahead
The next meaningful date is the full National Assembly debate on the revenue section of the 2027 budget. Amendments can be reintroduced there, and the political arithmetic may differ from the committee stage. Until those votes occur, every crypto-related proposal remains provisional. French residents who hold substantial self-custody positions have time to prepare records and to seek advice, but they do not yet face a hard legal deadline.
I’ve watched similar rules evolve in other jurisdictions. Early versions are often refined after the first year of experience reveals practical problems. Valuation methods get clarified, thresholds are sometimes adjusted, and enforcement priorities become clearer. The French proposal may follow the same path. What matters in the meantime is understanding the direction of travel: large personal crypto holdings are becoming harder to keep entirely outside the formal reporting system.
For now, the sensible stance is cautious attention rather than immediate restructuring. Monitor the parliamentary calendar, keep clean records, and remember that the difference between a committee amendment and a final statute can be substantial. The €100,000 threshold and the €10,000 fine have captured attention because they are concrete and easy to remember. The real story is how those numbers survive the remaining legislative steps and how holders ultimately respond once the rules, if any, take effect.
