Whether you clip paper coupons, redeem digital codes, or use app offers, you’re probably assuming that you clearly see the expiration date. But many shoppers discover, often at checkout, that their coupon doesn’t work—even though they thought it was still valid. That’s because there are hidden expiration rules baked into coupon systems, especially digital ones, that trip up consumers. Knowing how and why those hidden expiration traps exist can save you frustration—and money. Let’s dig into how to spot them and outsmart them.
