How DAC8 Reporting Affects Self-Custody Crypto Users

From January 2026, the EU’s eighth Directive on Administrative Cooperation — DAC8 — is expected to apply in most member states. Often described as the start of a new era for crypto tax reporting in Europe, DAC8 requires crypto-asset service providers, or CASPs, to report user transaction data to local tax authorities. That information can then be automatically exchanged between EU member states.

For crypto traders, especially DeFi and self-custody users, the obvious question is: does DAC8 mean tax authorities will see everything I do from my wallet?

The short answer is no — DAC8 mainly targets service providers, not self-custody wallets themselves. But that does not remove your personal tax obligations. This article explains what DAC8 covers, what it does not cover, and how self-custody users can think about privacy, recordkeeping, and practical workflows.

What is DAC8?

DAC8 is the eighth amendment to the EU Directive on Administrative Cooperation. Its purpose is to bring crypto assets into the EU’s automatic exchange of information framework, commonly referred to as AEOI.

The DAC8 framework is closely aligned with the OECD’s Crypto-Asset Reporting Framework, or CARF. It requires CASPs operating in the EU to collect and report information such as:

• User identity details, including name, address, and tax identification number
• Crypto buy and sell transactions
• Fiat-to-crypto and crypto-to-fiat conversions
• Crypto-to-crypto swaps, such as ETH to BTC

This data is generally reported annually. Member state tax authorities collect the information and exchange it through EU information-sharing systems with the tax authority in the user’s country of tax residence.

DAC8 scope: CASPs, not self-custody wallets

DAC8 is aimed at CASPs — entities that provide crypto trading, custody, exchange, brokerage, or similar services.

Entities that may have reporting obligations under DAC8 include:

• Centralized exchanges, such as Coinbase or Binance
• Crypto custody providers
• Fiat-to-crypto and crypto-to-fiat exchange platforms
• Certain brokers and market makers

By contrast, the following are not directly within the DAC8 reporting scope:

• Personally held self-custody wallets
• Pure on-chain DeFi transactions with no centralized service provider involved
• Peer-to-peer transactions between users

The EUR-Lex DAC8 regulatory text frames the reporting obligation at the service-provider level, not at the end-user wallet level.

How DAC8 works alongside MiCA

DAC8 and MiCA form two parts of the EU’s crypto regulatory structure.

MiCA focuses on market access and operating requirements for CASPs. DAC8 focuses on tax reporting by those CASPs.

In practice, this means:

• If you trade through a regulated EU centralized exchange, DAC8 can directly affect you because the exchange may report your transaction records.
• If you connect directly to decentralized protocols through a self-custody wallet such as OneKey, with no CASP in the middle, DAC8 reporting is not automatically triggered by that wallet activity.

DAC8 scope comparison

Tax responsibility for self-custody users

DAC8 does not directly require self-custody wallet users to report wallet activity to tax authorities. But that does not mean self-custody transactions are tax-free.

EU member states generally impose tax obligations on crypto disposals and income events. Depending on the country, taxable events may include:

• Token swaps
• Capital gains from trading
• DeFi yield
• Staking rewards
• Derivatives profits
• Other on-chain income

The absence of DAC8 reporting only means tax authorities may not automatically receive that specific on-chain data from a CASP. You may still have a legal duty to report taxable activity accurately under your local tax rules.

A practical approach is to maintain your own records when using self-custody. Keep track of:

• Transaction time and date
• Asset type
• Amount
• Counterparty or protocol, where relevant
• Market value at the time of the transaction
• Fees paid

These records can be important when preparing tax filings or responding to questions from a tax authority.

Tools such as Revoke.cash can also help you review wallet approvals and reconstruct parts of your wallet activity, although they are not a substitute for proper tax records.

Practical workflow for DeFi and self-custody users

For users who mainly operate in DeFi, DAC8 changes the reporting environment around centralized platforms, but it does not eliminate the value of self-custody.

A practical workflow may look like this:

1. Use centralized exchanges mainly as fiat rails. If you need to move between fiat and crypto, a CEX may still be necessary. But reducing unnecessary trading on centralized platforms can reduce the amount of trading activity captured through DAC8 reporting.
2. Use a non-custodial wallet for on-chain activity. With a self-custody wallet such as OneKey, your private keys remain under your control, and on-chain DeFi activity does not pass through a CASP by default.
3. Keep your own transaction records. DAC8 does not remove your obligation to report taxable events. Good records make tax reporting and audit responses much easier.
4. Check your local rules. EU member states can treat DeFi yield, staking, swaps, and derivatives differently. Some countries have already clarified that on-chain income must be reported.

For users trading perpetual contracts on Hyperliquid, the current practical distinction is that Hyperliquid is a decentralized protocol and is not generally treated as a CASP under the DAC8 framework. As a result, your Hyperliquid trading records would not typically be reported through the DAC8 CASP reporting channel. However, any profits or taxable events may still need to be reported under your local tax law.

Keeping the self-custody advantage with OneKey

OneKey Wallet is a fully non-custodial self-custody wallet for managing assets across multiple chains. Your private keys remain under your control, rather than being held by an exchange or custodian.

With OneKey, you can:

• Manage multi-chain assets from a self-custody wallet
• Connect directly to decentralized protocols
• Access Hyperliquid through OneKey Perps for decentralized perpetual trading
• Interact with major DeFi derivatives protocols such as GMX
• Keep on-chain activity outside the default DAC8 reporting path where no CASP is involved

OneKey’s code is fully open source and available on GitHub, giving users and developers a transparent basis to review how the wallet works.

This does not make trading risk-free, and it does not remove tax obligations. But for users who want to reduce reliance on centralized exchanges while keeping control of their assets, OneKey provides a practical self-custody workflow.

FAQ

Q1: Will DAC8 let tax authorities see all of my crypto transactions?

Not automatically. DAC8 requires CASPs to report user transactions that occur through their platforms. If you trade through a self-custody wallet on a DEX with no CASP involved, those transactions are not automatically reported through DAC8. You may still have personal tax reporting obligations.

Q2: When does DAC8 take effect?

DAC8 is expected to apply in most EU member states from January 2026. CASPs are expected to report data for the 2026 reporting year, with first reports submitted to tax authorities in 2027. Some member states may have different implementation timelines, so check the rules in your country.

Q3: Do I need to pay tax on profits from Hyperliquid trading?

Possibly, yes. DAC8 non-reporting does not mean tax exemption. EU member states commonly tax crypto capital gains, trading income, or derivatives profits. You should assess and report taxable gains according to your local rules.

Q4: If I withdraw from a CEX to my OneKey wallet, will DAC8 record that withdrawal?

The CEX side may be reported. A centralized exchange acting as a CASP may need to report the transfer, depending on the transaction and applicable DAC8 requirements. Your OneKey wallet itself is non-custodial and does not report to tax authorities as a CASP.

Q5: Could DAC8 expand to cover self-custody wallets in the future?

Currently, DAC8 does not directly apply to self-custody wallets. However, EU regulators continue to discuss DeFi and wallet-related regulatory approaches. ESMA and the European Commission are studying future DeFi oversight, so users should monitor official EU updates.

Conclusion and practical next steps

DAC8 is a major step toward crypto tax transparency in the EU, but its reporting obligations mainly fall on CASPs, not individual self-custody wallet users.

If you want to preserve more on-chain privacy while operating within the compliance environment, a practical approach is to reduce unnecessary CEX activity, use self-custody for DeFi, and maintain accurate records for tax reporting.

You can download and try OneKey Wallet to build a self-custody setup, then use OneKey Perps to access decentralized perpetual trading through protocols such as Hyperliquid. It is a practical way to keep control of your assets while avoiding unnecessary dependence on centralized platforms.

Risk warning

This article is for informational purposes only and does not constitute tax, legal, financial, or investment advice. Crypto trading involves significant market risk and can result in loss of principal. DAC8 implementation may vary by EU member state, and reporting requirements may differ by country. For tax planning or reporting decisions, consult a qualified tax or legal professional in your jurisdiction.