France Crypto Tax Filing Deadlines 2026

The hard part of a French crypto return is rarely the maths; it is the calendar. The substantive rules are stable across the year, but the 2026 filing window is short, split into three département zones with different dates, and one of the forms carries a penalty whether or not you owe a cent of tax. This article is just the 2026 dates and what is due on each: the calculation lives in the 150 VH bis guide, the exemption gate in the €305 article, and the foreign-account form in Cerfa 3916-bis. The pillar is the France crypto tax guide.

Key dates

• Online service opens: 9 April 2026.
• Zone 1 (dép. 01–19 and non-residents): 21 May 2026.
• Zone 2 (dép. 20–54): 28 May 2026.
• Zone 3 (dép. 55–974 and 976): 4 June 2026.
• Paper return: 19 May 2026 (for those still entitled to paper).
• Forms: 2086 (gains) and 3916-bis (foreign accounts) inside the 2042 return; net result to 2042 C lines 3AN and 3BN.

The 2026 calendar

The zone is set by your département of tax residence (the first digits of your postcode). Non-residents follow the Zone 1 date. These dates are published by the DGFiP on impots.gouv.fr and can be adjusted — confirm before filing, especially close to the deadline.

Which crypto forms are due

The crypto declaration is not a separate filing — it lives inside the annual income return (Form 2042):

Form 2086 is reached online at the annexes step ("Déclarations annexes"). The €305 exemption test is applied first: if total annual disposals ≤ €305, no 2086 computation is needed (see the France €305 exemption); above €305, every disposal is computed with the 150 VH bis method and the net flows to 2042 C.

3916-bis is independent: it is due for every foreign exchange account even if you sold nothing and even if total disposals were under €305 (see Cerfa 3916-bis).

What late filing actually costs

Two distinct exposures:

1. Late income-return filing: interest on late payment (intérêt de retard) plus a surcharge that escalates if the DGFiP issues a formal notice (mise en demeure) before you file.
2. Omitted 3916-bis: a separate €750-per-account penalty (€1,500 if the account balance exceeded €50,000 at any point), under article 1736 X CGI — applied regardless of whether any tax was due.

The practical rule: file on time even if you cannot pay immediately. Non-filing — especially missing 3916-bis — is penalised harder than late payment of a correctly declared amount, and DAC8 (effective 1 January 2026) makes an omitted foreign account easy for the DGFiP to detect (see DAC8 impact on individuals).

Practical workflow for the 2026 return

1. Identify your zone from your département; note the deadline (21 May / 28 May / 4 June; paper 19 May).
2. Reconstruct the year's history before the online service opens (9 April) — do not start on deadline week.
3. Apply the €305 test; if above, compute every disposal via 150 VH bis.
4. File 2086 at the annexes step; carry the net to 2042 C (3AN/3BN).
5. File one 3916-bis per foreign account — independent of any disposal.
6. Submit before your zone deadline; reconcile against DAC8-reported data afterwards.

Using a tool against the calendar

A tool computes figures; it does not file for you, and it does not manage the zone calendar. What a tool can do is get the numbers ready before the window opens, so deadline week is filing rather than reconstruction. Confirm the tool:

• reflects the 2026 PFU at 31.4% and the 150 VH bis method, so the figure you file is current;
• lets you generate the export before the 9 April online opening, ahead of any exchange API delays;
• lists every foreign account, so the independent 3916-bis is not overlooked when the €305 test says no 2086 is needed.

Waltio is French-specialised and Koinly supports the French regime; both produce 2086-ready output. The zone, the opening date, and the 3916-bis independence remain the filer's responsibility.

Common Mistakes French Crypto Holders Make at Filing Time

The French crypto-filing calendar produces a cluster of recurring errors. Each is avoidable with preparation; each is expensive to discover after the deadline.

Mistake 1: Confusing the online opening with the deadline. The online service opens 9 April. The zone deadline is 21 May, 28 May, or 4 June. Some filers treat the opening date as a deadline and either panic-file incomplete data or assume they have until 9 April. The opening date is when you can start, not when you must finish.

Mistake 2: Treating 3916-bis as optional when under the €305 threshold. The 3916-bis foreign-account declaration is entirely independent of whether you had taxable disposals. If you held or used a foreign exchange account during the year, 3916-bis is due — full stop. The €305 threshold determines whether you compute 2086; it has no effect on 3916-bis. The €750-per-account penalty for a missed 3916-bis applies even when you owe zero income tax.

Mistake 3: Reconstructing history after the service opens. Waiting until April to begin pulling exchange histories is the most common scheduling error. API exports from major exchanges can be delayed, incomplete, or require account verification that takes days. The reconstruction should be complete before the 9 April opening, so that filing week is spent filing, not data-gathering.

Mistake 4: Applying the €305 test incorrectly. The €305 is an all-or-nothing threshold based on total annual disposals, not per-transaction or per-asset. If total disposals — across every exchange account and wallet — exceed €305, every disposal (including the first) enters the 2086 computation. There is no partial exemption above €305.

Mistake 5: Forgetting to carry the result to Form 2042 C. Form 2086 computes the gain or loss; that result must then be carried to 2042 C (line 3AN for a net gain, 3BN for a net loss). Some filers complete 2086 correctly but omit the carry, leaving the declaration incomplete. The online system's annexes workflow prompts this, but verifying the carry step is part of the quality check before submission.

Mistake 6: Using the wrong PFU rate. For 2026 disposals, the PFU (prélèvement forfaitaire unique) is 31.4% (12.8% income tax + 18.6% social charges, following the CSG rise from 9.2% to 10.6%). Any tool or reference citing 30% is applying the pre-2026 rate and will understate the tax.

The Interaction Between the Zone Calendar and DAC8

From 1 January 2026, CASPs automatically report user activity to the DGFiP under DAC8. The authority-to-authority exchange is due by 30 September 2027 for FY 2026. This means that by the time the 2026 returns are cross-checked against reported CASP data, the filing window will have long closed. The practical implication: the DAC8 cross-check is not a warning before the deadline — it happens after. Filing incorrectly now and hoping to correct later is a weaker strategy than reconciling against expected CASP-reported data before submitting.

The reconciliation is straightforward for accounts held at major EU CASPs: the CASP will report aggregate acquired and disposed figures per asset. Your 2086 should produce figures in the same ballpark. A material discrepancy — even an innocent one from a missed wallet — is worth identifying before filing, not after.

How Wag3s fits in

Wag3s Folio reconstructs the year's multi-chain history continuously, so the 2086 figures are ready before the 9 April opening rather than rushed in deadline week, and it reconciles against DAC8-reported activity. It prepares the numbers and the trail; the filing itself, and any judgement on a complex return before the zone deadline, are where it is meant to support a qualified French expert-comptable rather than replace one.

Further reading

• France Crypto Tax Guide 2026 — the French pillar
• Cerfa 2086 Explained
• The France €305 Exemption
• Cerfa 3916-bis — Foreign Crypto Accounts
• Declare Crypto Without an Accountant (France)
• DAC8 Impact on Individuals

Sources

• impots.gouv.fr — Les modalités de la déclaration de revenus en 2026: the 9 April online opening, the department-zone deadlines (21 May / 28 May / 4 June), and the 19 May paper deadline.
• impots.gouv.fr — Calendrier fiscal: the official income-return dates, confirmed close to the campaign.
• Légifrance — Article 1736 CGI: the €750 / €1,500-per-account fine for an undeclared foreign digital-asset account, applied independently of any tax due.
• Council Directive (EU) 2023/2226 (DAC8) — EUR-Lex.