Liquidation Bonus vs Penalty: Who Pays Whom in DeFi?

Liquidation bonus and liquidation penalty name two opposite ways DeFi protocols pay for the work of liquidating risky loans. In a bonus model, the liquidator receives extra collateral as a reward for repaying debt. In a penalty model, the borrower is charged an additional fee when their position is liquidated, and the protocol keeps that fee.

Who pays whom depends on the mechanism. In money-market pools such as Compound and Aave, liquidators get a protocol-set bonus or discount, which comes from seizing more collateral than the repaid debt is worth. The borrower effectively pays the liquidator through extra collateral. In MakerDAO’s vault system, a liquidation penalty is added to the vault’s debt, and auctions seek to recover debt plus penalty. The borrower pays the protocol the penalty, while auction participants still aim to buy collateral at a discount to market.

This split matters for incentives, keeper participation, and protocol solvency. Bigger bonuses can speed liquidations but leak more value from borrowers, while larger penalties can strengthen protocol buffers but must still attract auction buyers. Governance sets these parameters, so each model encodes a different balance of risk and reward.

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