DAC8: What the Tax Authority Will Know About Your Crypto Assets

Comprehensive guide to the directive on automatic exchange of crypto tax information

December 2025 | Reference article | Category: Taxation

Table of Contents

1. Introduction: The End of Tax Anonymity
2. Context and History: From DAC1 to DAC8
3. Scope of Application
4. Data Transmitted: The Exhaustive Details
5. Implementation Timeline
6. Sanctions for Platforms
7. What This Means for You
8. What Escapes DAC8
9. Comparison with CRS/FATCA
10. FAQ
11. Sources and References

1. Introduction: The End of Tax Anonymity

When the French tax authority (Bercy) will know everything about your Bitcoins without you having to say a word

On October 17, 2023, the Council of the European Union adopted Directive (EU) 2023/2226, commonly known as DAC8. This directive marks a historic turning point: for the first time, crypto assets are integrated into the automatic exchange of tax information system between Member States.

In practical terms, starting January 1, 2026, every transaction you carry out on a regulated crypto platform will be documented, archived, and automatically transmitted to the tax authority of your country of residence — and then potentially shared with 26 other European countries.

What DAC8 Represents

⚠️ Disclaimer: This document is current as of December 2025. National transposition may introduce specific provisions. Consult a professional for your personal situation.

2. Context and History: From DAC1 to DAC8

Eight directives in twelve years to close the European tax net

2.1 The Evolution of European Tax Cooperation

DAC8 is the eighth amendment to the Directive on Administrative Cooperation in tax matters. Each version has broadened the scope of automatic exchange:

2.2 Why DAC8? The Crypto Asset "Blind Spot"

Until DAC8, crypto assets constituted a major fiscal blind spot:

"Crypto assets are inherently cross-border in nature and their use for illicit tax purposes can only be effectively combated through the exchange of information between tax administrations."

Source: Recital 4 of Directive (EU) 2023/2226

Estimated fraud: The European Commission estimated that several billion euros in crypto capital gains were escaping taxation annually within the EU due to a lack of traceability.

2.3 Link with the OECD CARF

DAC8 transposes into European law the CARF (Crypto-Asset Reporting Framework) developed by the OECD in 2022. The CARF establishes an international standard for:

• Identification of crypto users
• Collection of transaction data
• Automatic exchange between jurisdictions

Global reach: The CARF has been adopted by more than 50 countries, including all EU members, the United States, the United Kingdom, Canada, Australia, Japan, and Singapore.

    OECD (CARF)
         │
         ▼
    ┌─────────┐
    │  DAC8   │ ◄── European transposition
    │  (EU)   │
    └────┬────┘
         │
    ┌────┴────┐
    │ FR Law  │ ◄── National transposition
    │ (2025)  │
    └─────────┘

3. Scope of Application

Tax residents, platforms, and crypto assets targeted by the directive

3.1 Who Is Affected? Tax Residents

DAC8 applies to tax residents of the European Union, regardless of the location of the platform used.

Tax residency criteria (France):

• Tax household in France
• Primary residence in France (>183 days)
• Main professional activity in France
• Center of economic interests in France

"The exchange of information concerns users of crypto assets who are reportable persons, that is, tax residents of a Member State."

Source: Article 8ac of the DAC8 Directive

3.2 Which Platforms Must Report?

Reporting entities (Reporting Crypto-Asset Service Providers):

Registration obligation: Non-EU platforms that serve European clients must register in a Member State to comply with DAC8, or face being blocked.

3.3 Which Assets Are Covered?

Crypto assets covered:

Exclusions:

• Central bank digital currencies (CBDCs)
• Traditional electronic money (already covered by DAC2)

4. Data Transmitted: The Exhaustive Details

Identity, transactions, balances: everything platforms send to the tax authority

4.1 Holder Identification

For each user, the platform must collect and transmit:

For legal entities:

• Company name
• Registered office address
• Registration number
• Identity of beneficial owners (>25%)

4.2 Fiat/Crypto Transactions (Purchases and Sales)

Every conversion between fiat currency and crypto asset is reported:

Example of a reported line:

| Date       | Type | Fiat     | Crypto | Quantity | Price       |
|------------|------|----------|--------|----------|-------------|
| 2026-03-15 | Buy  | €5,000   | BTC    | 0.052    | €96,153/BTC |
| 2026-06-20 | Sell | €12,000  | ETH    | 3.5      | €3,428/ETH  |

4.3 Crypto/Crypto Transactions

Exchanges between crypto assets are also reported:

Crucial point: Crypto-to-crypto exchanges, although not taxable in France (no conversion to fiat), are nevertheless reported to the tax authority.

4.4 Transfers to External Wallets

When you withdraw crypto to an external wallet:

Warning: Your personal wallet address is therefore transmitted to the tax authority, creating a link between your identity and your on-chain address.

4.5 Year-End Balances

On December 31 of each year, the platform reports:

4.6 Summary Table of Transmitted Data

┌─────────────────────────────────────────────────────────────────┐
│                    ANNUAL DAC8 REPORT                            │
├─────────────────────────────────────────────────────────────────┤
│ IDENTIFICATION                                                  │
│ ├── Name: DUPONT Jean-Pierre                                   │
│ ├── Date of birth: 06/15/1985                                  │
│ ├── Address: 12 rue des Lilas, 75011 Paris                     │
│ ├── TIN: 1234567890123                                         │
│ └── Country of residence: FR                                   │
├─────────────────────────────────────────────────────────────────┤
│ 2026 TRANSACTIONS                                               │
│ ├── Fiat→crypto purchases: 25 operations, total €45,000        │
│ ├── Crypto→fiat sales: 8 operations, total €28,000             │
│ ├── Crypto→crypto swaps: 42 operations, value €67,000          │
│ └── External transfers: 5 operations, 2.3 BTC to 3 addresses  │
├─────────────────────────────────────────────────────────────────┤
│ BALANCE AS OF 12/31/2026                                        │
│ ├── BTC: 1.25 units = €125,000                                 │
│ ├── ETH: 15.7 units = €55,000                                  │
│ ├── USDC: 8,500 units = €8,500                                 │
│ └── TOTAL: €188,500                                            │
└─────────────────────────────────────────────────────────────────┘

5. Implementation Timeline

From adoption in 2023 to the first automatic exchanges in 2027

5.1 Key Dates

5.2 Transposition in France

France transposed DAC8 through the Finance Law for 2025:

"Crypto-asset service providers [...] shall transmit to the tax administration, no later than January 31 of each year, information relating to operations carried out during the preceding calendar year."

Source: Article 1649 AC of the Code général des impôts (amended)

5.3 First Reporting Period

Year 2026                            Year 2027
┌────────────────────────────┐      ┌────────────────────────────┐
│ Jan 1: Collection begins   │      │ Jan 31: Transmission of    │
│                            │      │ 2026 data to DGFiP         │
│ All transactions           │ ───► │                            │
│ recorded                   │      │ Sept 30: Exchange between  │
│                            │      │ Member States              │
│ Dec 31: Balances captured  │      │                            │
└────────────────────────────┘      └────────────────────────────┘

6. Sanctions for Platforms

What exchanges risk if they do not comply

6.1 Fines per Unreported Transaction

DAC8 requires Member States to provide for effective, proportionate, and dissuasive sanctions.

In France, the sanctions regime provides for:

6.2 License Revocation

In the event of repeated or serious failures, the AMF (French Financial Markets Authority) may:

• Temporarily suspend the CASP license
• Permanently revoke the license
• Prohibit activity on French territory

6.3 Director Liability

Platform directors may be personally sanctioned:

• Administrative fines
• Management bans
• Criminal prosecution in cases of proven fraud

7. What This Means for You

Concrete impact on your daily use of crypto

7.1 End of "De Facto Anonymity" on CEXs

Until now, even though platforms collected your data (KYC), they did not systematically transmit it to the tax authority. You relied on your own good-faith self-reporting.

After DAC8:

• Every euro invested is traced
• Every sale is documented
• Every transfer is recorded
• Your crypto portfolio is known as of December 31

7.2 Cross-Referencing with Other Tax Data

The tax authority will be able to cross-reference DAC8 data with:

7.3 Risk of Automated Tax Adjustments

Likely scenario from 2028 onward:

                     ┌─────────────────┐
                     │   Audit         │
                     │   Algorithm     │
                     └────────┬────────┘
                              │
        ┌─────────────────────┼─────────────────────┐
        ▼                     ▼                     ▼
┌───────────────┐    ┌───────────────┐    ┌───────────────┐
│  DAC8 Data    │    │  Tax Return   │    │   Banking     │
│  (platform)   │    │   IR 2086     │    │   Data        │
└───────┬───────┘    └───────┬───────┘    └───────┬───────┘
        │                    │                    │
        └─────────────┬──────┴────────────────────┘
                      ▼
              ┌───────────────┐
              │  Anomaly?     │
              │  Gap > €X     │
              └───────┬───────┘
                      │ YES
                      ▼
              ┌───────────────┐
              │  Proposed     │
              │  adjustment   │
              └───────────────┘

Types of anomalies detected:

• Undeclared sales
• Capital gains calculation errors
• Omission of foreign accounts
• Inconsistency between declared assets and lifestyle

7.4 Actions to Take Now

1. Regularize the past (if necessary) If you have not declared past capital gains, it is preferable to regularize voluntarily before 2027. Penalties are less severe in the case of a voluntary approach.

2. Document your history

• Export the complete history from all your platforms
• Keep proof of acquisition prices
• Use a tracking tool (Waltio, Koinly, CoinTracking)

3. Declare correctly starting in 2026

• Form 2086: capital gains from disposals
• Form 3916-bis: accounts on foreign platforms
• Consistency between your declarations and the transmitted data

8. What Escapes DAC8

Areas that remain off the automatic exchange radar

8.1 Pure Self-Custody

Wallets that you control directly (hardware wallets, software wallets) are not covered by DAC8, as there is no reporting service provider.

However, be aware:

• Movements to/from a CEX are tracked
• Your wallet address is known upon withdrawals
• On-chain analysis can reconstruct your movements

8.2 DeFi Protocols

Decentralized protocols (Uniswap, Aave, Curve) have no reporting legal entity. Your swaps on a DEX are not directly reported under DAC8.

Limitations:

• Entry/exit via a CEX remains tracked
• On-chain data is public
• Regulatory evolution could change the situation

8.3 P2P Transactions

Direct exchanges between individuals, without a regulated intermediary, escape DAC8.

However:

• The fiscal reporting obligation remains
• Bank movements may attract attention
• Professional sellers must be registered as CASPs

8.4 Summary Table

9. Comparison with CRS/FATCA

DAC8 within the international tax exchange ecosystem

9.1 What Is CRS?

The Common Reporting Standard (CRS), introduced by DAC2 in 2014, mandates the automatic exchange of information on bank accounts held abroad.

9.2 What Is FATCA?

The Foreign Account Tax Compliance Act is a US law requiring financial institutions worldwide to report accounts held by American citizens.

9.3 Comparison Table

9.4 Convergence of Systems

Ultimately, DAC8 and CRS/CARF will be interconnected, creating a global view of your worldwide financial assets:

┌─────────────┐    ┌─────────────┐    ┌─────────────┐
│   DAC2/CRS  │    │    DAC8     │    │   FATCA     │
│  (Banks)    │    │  (Crypto)   │    │   (US)      │
└──────┬──────┘    └──────┬──────┘    └──────┬──────┘
       │                  │                  │
       └──────────────────┼──────────────────┘
                          ▼
                 ┌─────────────────┐
                 │  Tax Authority  │
                 │   (360° view)   │
                 └─────────────────┘

10. FAQ

Q1: Does DAC8 apply to non-EU platforms?

Yes, if they serve clients who are EU residents. They must register in a Member State or cease serving European clients.

Q2: Will my past transactions (before 2026) be reported?

No, DAC8 is not retroactive. Only transactions from January 1, 2026 onward will be collected. However, platforms retain earlier history which may be requested as part of a tax audit.

Q3: If I only use DEXs, am I affected?

Partially. Your swaps on DEXs are not reported via DAC8. But if you use a CEX to enter or exit via fiat, those movements are tracked. Furthermore, your fiscal reporting obligations remain the same.

Q4: Are NFTs included in DAC8?

It's ambiguous. "Unique and non-fungible" NFTs are excluded from MiCA, but DAC8 covers "crypto assets" in the broad sense. Large collections or fractionalized NFTs are likely included. ESMA must clarify.

Q5: How will the tax administration use this data?

Through cross-referencing algorithms comparing:

• Your tax returns (form 2086)
• DAC8 data received
• Your bank movements Significant discrepancies will generate alerts and potentially requests for explanation or proposed adjustments.

Q6: Can I refuse to have my data transmitted?

No. Transmission is mandatory for regulated platforms. If you refuse to provide KYC information, the platform must close your account.

Q7: What is the minimum reporting threshold?

There is no threshold. Every transaction, even one of just a few euros, is technically reportable. In practice, platforms may apply de minimis thresholds for very small amounts.

Q8: Are stablecoins covered?

Yes, stablecoins (USDT, USDC, etc.) are crypto assets within the meaning of DAC8. Euro↔stablecoin exchanges and holdings are reported.

Q9: Will my data be shared with non-EU countries?

Potentially, within the CARF framework. Signatory countries (including the United States, the United Kingdom, Switzerland, and Singapore) will exchange information through bilateral agreements.

Q10: What happens if I move to another country?

If you change your tax residence during the year, you will be reported in each country where you were a resident. Your data will be sent to the tax administrations of both countries.

📚 Related Articles

To deepen your understanding of the European regulatory framework:

• 🏛️ France 2026: The End of Financial Sovereignty — Pillar article analyzing the full crypto control framework in France
• 🔗 Travel Rule: Crypto Transfer Tracing — How every transfer over €1,000 is traced
• 🚫 AMLR: The End of Anonymous Payments — Ban on anonymous transactions from 2027
• ⚖️ Crypto Tax Audit: Procedure and Defense — Your rights when facing a tax audit
• 🔒 SATD Crypto: Administrative Seizure — How the tax authority can seize your crypto

🇫🇷 France 2026 Regulatory Context

DAC8 is part of a coordinated set of measures:

Regulation	Effective Date	Impact
MiCA	June 2024	Mandatory licensing for CASPs
Travel Rule	December 2024	Traceability of transfers > €1,000
DAC8	January 2026	Automatic exchange of tax information
AMLR	July 2027	End of anonymous crypto payments
LPM	In force	Private key requisition possible

➡️ See our Complete France 2026 Guide to understand how these measures work together.

11. Sources and References

European Texts

• Directive (EU) 2023/2226 of the Council of October 17, 2023 amending Directive 2011/16/EU (DAC8)
• Directive 2011/16/EU on administrative cooperation in the field of taxation
• Regulation (EU) 2023/1114 (MiCA) - Crypto asset definitions

French Transposition

• Finance Law for 2025 - Transposition articles
• Article 1649 AC of the CGI (amended) - CASP reporting obligations
• BOFiP - Doctrine forthcoming

OECD Sources

• CARF - Crypto-Asset Reporting Framework (2022)
• CRS - Common Reporting Standard
• OECD commentaries and FAQ on the CARF

Analyses and Commentary

• European Commission - FAQ on DAC8
• CMS Francis Lefebvre - "Crypto asset taxation: focus on DAC8 transposition"
• PwC, EY, Deloitte - Client notes on DAC8
• ADAN - Position on automatic exchange of information

Specialized Media

• Cryptoast - Tax regulation analyses
• Journal du Coin - Legislative monitoring
• The Block - International coverage

Document written in December 2025

This document constitutes a regulatory analysis and does not replace personalized tax advice.

Recommended internal links:

• France 2026: The End of Financial Sovereignty — Pillar article
• Travel Rule: Crypto transfer tracing — Regulatory complementarity
• AMLR: The end of anonymous crypto payments — Another aspect of control
• Crypto tax optimization — Legal strategies