Coupons are supposed to save money, but sometimes they do the opposite in sneaky ways. One missed detail can turn a “great deal” into a full-price purchase, and a bad habit can quietly add up across months. If you’ve ever left the store annoyed, confused by your receipt, or wondering why your total didn’t match your plan, you’re in good company. The fix usually isn’t more coupons—it’s fewer slip-ups and a tighter routine. Here are the most common coupon mistakes experienced shoppers say hit their budgets hard, plus simple ways to avoid them.
