Based on mental accounting theory, this research explores the effect of windfall money on purchase intention for new products through six studies. The results show that consumers who receive unexpected windfall money are more willing to purchase new products than those who do not receive unexpected windfall money (Studies 1a, 1b, and 2). Moreover, perceived risk is the underlying mechanism (Studies 3a and 3b). Product involvement plays a moderating role: The effect of windfall money on purchase intention disappears for highinvolvement new products but persists for lowinvolvement new products (Study 4). This research expands the research scope of windfall money, enriches the influencing factors of purchase intention for new products, and provides evidence for companies to present the discount information.