Cerfa 2086 Explained

Form 2086 (Cerfa 2086) is where French occasional crypto investors actually declare their gains. It is short, but it encodes three things people get wrong: the 2026 PFU is 31.4%, not 30%; the gain is computed by a portfolio-proportional formula, not FIFO; and the €305 threshold is all-or-nothing. This is a box-by-box walkthrough with the 2026 numbers.

TL;DR

• Form 2086 declares crypto capital gains/losses under article 150 VH bis CGI, annexed to the income return (Form 2042).
• 2026 PFU: 31.4% (12.8% income tax + 18.6% prélèvements sociaux) — up from 30%, because CSG rose 9.2% → 10.6%.
• Gain formula (per disposal): disposal price − (total acquisition price × disposal price / total portfolio value). Not FIFO.
• €305 threshold: total annual disposals ≤ €305 → fully exempt; > €305 → all disposals taxable.
• Crypto-to-crypto is not taxable for occasional investors — not a 2086 trigger by itself.

What Form 2086 is

Form 2086 is the dedicated declaration of plus ou moins-values de cessions d'actifs numériques — capital gains and losses on disposals of digital assets — under article 150 VH bis of the Code général des impôts (CGI). It is filed as an annex to the annual income tax return (Form 2042) and is required for any year with at least one taxable disposal. The resulting net gain flows to the 2042 and is taxed at the PFU (or, by option, the progressive scale — see PFU vs barème).

A taxable disposal under 150 VH bis is a conversion of crypto to fiat, to goods or services, or other disposal. A crypto-to-crypto exchange is not a taxable event for an occasional investor and does not, on its own, require a 2086.

The 2026 PFU: 31.4%, not 30%

The single most common 2026 error: using 30%. The prélèvement forfaitaire unique on crypto capital gains is 31.4% from 1 January 2026:

The social-charges component rose because the CSG on capital income increased from 9.2% to 10.6%, lifting prélèvements sociaux from 17.2% to 18.6% and the total from 30% to 31.4%. Any 2026 computation using "30%" or "17.2% social charges" is stale. This is exactly the kind of recently-changed figure where relying on prior-year memory produces a YMYL error — for 2026 it is 31.4%.

The calculation method (article 150 VH bis)

France does not use FIFO for occasional investors. Each taxable disposal is computed with the global-portfolio method:

Gain = disposal price − ( total acquisition price of the whole portfolio
                          × disposal price / total portfolio value at disposal )

In French terms: plus-value = prix de cession − (prix total d'acquisition du portefeuille × prix de cession / valeur globale du portefeuille). It is a portfolio-proportional formula, applied per disposal, tracking the cumulative acquisition price of the whole portfolio and its value at each disposal. Form 2086 has lines for the disposal price, the total acquisition price, and the portfolio value so it computes the gain per row. The full mechanics and worked examples are covered in crypto capital gains calculation France.

The €305 exemption

If the total of all digital-asset disposals for the year is €305 or less, the gains are fully exempt — no tax, effectively no 2086 computation needed. If total annual disposals exceed €305, even slightly, all the year's disposals become taxable and must be computed with the portfolio method on Form 2086. It is an all-or-nothing annual threshold on total disposal proceeds, not a per-transaction allowance. Detail in the France €305 exemption.

Box-by-box (what each part captures)

Without reproducing the official form, Form 2086 is organised as:

1. Identification — taxpayer details (pre-filled online).
2. Per-disposal lines — for each taxable disposal: date, disposal price (prix de cession), total acquisition price of the portfolio (prix total d'acquisition), portfolio value at disposal (valeur globale du portefeuille); the form computes the per-disposal gain/loss.
3. Annual summary — the net result (sum of gains and losses) carried to Form 2042 (the 3VG / 3VH lines for gain or loss).
4. 2042 link — the net gain is taxed at the PFU 31.4% (or progressive scale by option).

The data burden is the per-disposal portfolio inputs — accurate cumulative acquisition price and portfolio valuation at each disposal are what make the 2086 correct.

Practical workflow

1. Confirm a 2086 is required — at least one taxable (crypto-to-fiat/goods/services) disposal.
2. Apply the €305 test — total annual disposals ≤ €305 → exempt; otherwise all taxable.
3. Compute each disposal with the 150 VH bis portfolio formula (not FIFO).
4. Use the 2026 PFU 31.4% (12.8% + 18.6%) on the net gain — or elect the progressive scale.
5. File 2086 with the 2042 in the annual window; reconcile against DAC8-reported data (see DAC8 impact on individuals).

How vendor tools handle Form 2086

Waltio is French-market-specialised and pre-fills 2086 with the portfolio method; Koinly also produces 2086-compatible output. The decisive 2026 check: confirm the tool applies the 31.4% PFU (12.8% + 18.6%), not a stale 30%/17.2%, and the 150 VH bis portfolio method, not FIFO. Neither tool decides the occasional-vs-professional (BNC/BIC) characterisation.

How Wag3s helps

Wag3s Folio computes the 150 VH bis portfolio method per disposal and applies the 2026 PFU 31.4%, producing 2086-ready figures and reconciling against DAC8-reported activity. See the Folio product page.

Further reading

• France Crypto Tax Guide 2026 — the French pillar
• PFU vs Barème: Choosing in France
• Crypto Capital Gains Calculation France (150 VH bis)
• The France €305 Exemption
• Cerfa 3916-bis — Foreign Crypto Accounts
• DAC8 Impact on Individuals

Sources

• impots.gouv.fr — Form 2086: déclaration des plus ou moins-values de cessions d'actifs numériques
• Article 150 VH bis CGI — Légifrance
• 2026 CSG increase on capital income (9.2% → 10.6%) raising the PFU from 30% to 31.4%
• Council Directive (EU) 2023/2226 (DAC8) — EUR-Lex