There is considerable enthusiasm for the potential of artificial intelligence (AI) to improve financial well-being. Despite this enthusiasm, it is important to underscore AI's potential adverse effects on consumers' financial decisions. We introduce the AI-IMPACT model, a unifying theoretical framework for how AI can influence consumers' financial decisions. The model details how AI impacts the marketplace, affecting psychological processes and consumer traits core to financial decision-making (e.g., pain of payment, financial literacy). We use the AI-IMPACT model to illustrate one way AI can reduce financial well-being as its influence on the marketplace (e.g., facilitating biometric payment methods) decreases consumers' pain of payment, increasing spending. Lastly, we use the AI-IMPACT model to identify areas for future research at the intersection of AI and financial decision-making.