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Flash loans in DeFi: do they have tax implications in Spain?

Flash loans are instant uncollateralized loans in DeFi. Guide on whether they have tax implications in Spain.

Equipo kointax·May 29, 2026·4 min read

Flash loans in DeFi: tax implications in Spain?

The flash loan itself ≠ taxable event. Loan created and destroyed in one block.

What IS taxable = operations within the flash loan:

  • Arbitrage (buy on exchange A, sell on B): Capital gain
  • Liquidation (claim liquidation bonus): Capital gain
  • Debt refinancing: Collateral actions may generate taxable events if assets had unrealized gains

Complexity: Single transaction hash can contain dozens of individual operations.

kointax analyzes complex transactions and decomposes individual taxable events within flash loans.

👉 Analyze your flash loans with kointax

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