An intro APR is a common credit card promotion in which the card issuer offers a lower APR on purchases, balance transfers or both for an introductory period, usually 12–18 months. Any qualifying purchases or transfers you make during the intro period would be subject to the intro rate rather than the card’s regular APR. Keep in mind that your intro APR could be canceled if you make late payments, and your existing balance will be subject to the regular APR if you don’t pay it off in full by the end of the promotional period.