This study investigates when forced sales turn into fire sales by using a natural experiment which allows us to separate supply and demand effects: Forced sales result from sudden death of house owners and are thus unrelated to current market conditions. We find that forced sales result in fire sale discounts. Discounts increase when the sale is urgent, market conditions are poor, the seller is financially constrained, or the seller exhibits the disposition effect. Overall, our study identifies when forced sales lead to fire sale discounts, and highlights that fire sales occur even in the absence of temporary demand shocks.JEL Classifications: D14, R31