Always read the fine print. Most retail credit offers provide for 0 percent interest during the promotional repayment term. In most cases, the purchase will still accrue interest during that term at the store card´s standard rate, but if the balance is paid off during the promotional period, those interest charges are waived. If the balance is not paid off, you´ll have interest accrued from the date of purchase added to your outstanding balance. In some cases, retailers (or car dealers) will offer 0 percent financing throughout the loan term. You´ll typically need a strong FICO score to qualify for such offers, but if you do, you generally will not pay interest over the term of the loan and will only repay the principal. But keep in mind that when such an offer is made, the retailer or dealer is likely thinking they´re going to profit off of your relationship in other ways. So keep a sharp eye for price hikes or add-ons that may increase your overall cost of purchase.