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Flash loan

A loan that must be repaid, with any required fee, within the same blockchain transaction or the transaction reverses.

What is Flash loan?

A loan that must be repaid, with any required fee, within the same blockchain transaction or the transaction reverses.

Why it matters on your return

The loan itself is not income or a sale. What matters is what happens inside the transaction: arbitrage, liquidation, or collateral swaps executed with the borrowed funds are disposals, and the net profit is gain. The fee is a cost of the trade.

Example

You borrow 1,000 ETH in a flash loan, execute an arbitrage that nets 2 ETH after fees, and repay in the same block. The 2 ETH is short-term gain (or business income if the activity is a trade or business).

Is a flash loan taxable?

The borrowing is not. The trades executed with it are, and the profit is taxable in the year of the transaction.

Source: IRC 1001; IRS Notice 2014-21

Last reviewed September 18, 2026. Tax rules change; confirm current law before acting.

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