Would DEX Trades Be Taxable Under a Crypto Tax Policy?

🚨 If a crypto tax policy is implemented, would DEX trades be subject to it?

I’ve put together an overview based on tax policies being discussed in South Korea and examples from the United States. This information may not be accurate. Everything below is an estimate of what could happen if taxation is implemented.

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🔹 1. A DEX cannot collect taxes directly

• Its decentralized structure means it cannot conduct KYC, making automatic tax withholding at the time of a trade impossible.
• “A DEX does not collect tax” does not mean “DEX trades are tax-exempt.”

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🔹 2. Swaps and LP rewards are taxable

1️⃣ Swaps (token A ⇄ token B)

• Most countries classify cryptocurrency as property.
• Fair market value (FMV) at the time of the swap minus fair market value at acquisition = capital gain.
• U.S. IRS example: – Held for less than one year: ordinary income tax rates of 10%–37%. – Held for one year or more: long-term capital gains tax rates of 0%–20%.

2️⃣ LP rewards and staking income

• The fair market value of rewards when received is taxed as ordinary income.

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🔹 3. You must keep your own transaction records for each wallet

• DEXs do not automatically report transaction histories to the National Tax Service or the IRS.
• Save records of swaps, deposits, withdrawals, LP rewards and airdrops as CSV files or screenshots.
• U.S. IRS: Wallet-by-wallet gain and loss calculations are mandatory from 2025.
• South Korea: Crypto capital gains taxation is scheduled to begin in 2026, requiring users to calculate and report DEX trading gains themselves.

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🔹 4. U.S. news summary, as of 2025

• The repeal of the DeFi broker rule means DEX operators no longer have to report user information.
• DEX users’ tax obligations remain, however, increasing their individual reporting responsibility.
• Media and experts have raised concerns about tax evasion through DEX trading and said tax authorities may consider stronger regulation later.

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🔹 5. South Korean news summary, as of 2025

• Crypto capital gains taxation is scheduled to begin in 2026, and taxation of crypto-to-crypto swaps is also under consideration.
• DEX tax rules remain unclear; the National Tax Service plans to tax airdrops, mining and CEX swaps first.
• There have been no reported cases of DEX tax delinquency being detected yet, but detection using overseas node information or by tracing funds back through a CEX has been mentioned as a possibility.

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🔹 6. Key steps

1️⃣ Keep wallet-by-wallet transaction records

• Accurately record all swaps, LP rewards, airdrops and other transactions.
• Check the fair market value at acquisition and at disposal or swap.

2️⃣ Monitor changes to tax rules

• Follow guidance from the U.S. IRS and South Korea’s National Tax Service, as well as developments involving EU MiCA and CARF.

3️⃣ Minimize tax-evasion risk

• When funds move from a DEX to a CEX, they can be traced through the CEX’s KYC/AML procedures.
• Accurately report transaction details when withdrawing from a CEX.

4️⃣ Consult a tax professional

• Automated tools alone may not be sufficient for complex transactions involving DEXs, staking or airdrops.
• Consider consulting a tax adviser or accountant before filing.

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✨ Conclusion

• 🐔 A DEX cannot collect taxes directly, but gains from DEX trades are taxable.
• The most important step is for users to keep careful records and report their transactions themselves.

South Korea is also considering a crypto capital gains tax. With no clear guidelines in place for DEX trades, individuals must report all their transactions themselves.

😼 The conclusion: Although there is no way to collect the tax directly, users would in principle have to report their transactions if taxation is implemented?