Putting groceries or gas on a card when checking runs low can feel like a harmless bridge to the next paycheck. The problem is that the bill comes due later, and if it can't be paid in full, interest starts adding to the cost of everything you bought.

This can create a loop. Part of each new paycheck goes to the card, which leaves less for the coming weeks, which leads to more card spending. Over time, the balance can grow even when you feel like you're being careful, and interest charges become one more bill to cover.

If this sounds familiar, start by figuring out why the gap happens. It may be an irregular expense, a timing mismatch between bills and paydays, or spending that's simply higher than income. Some lenders and card issuers will discuss changing due dates to line up better with your pay schedule. A nonprofit credit counselor can also help you look at options for paying down balances.