A promotional APR is a temporarily reduced interest rate — often 0% — that a credit card issuer applies to specific transactions for a limited number of months after you open the account. The rate usually covers new purchases, balance transfers, or both, and it always expires on a date set in your account agreement. Whatever balance remains after that date starts accruing interest at the card’s regular rate.
What a Promotional APR Covers
Issuers use these offers to attract new customers, and the two most common versions are purchase promotions and balance transfer promotions. Many cards offer both at once.
A promotional purchase APR applies to new charges on the card. At 0%, you can finance a large expense and pay it down over several months without interest building up. A promotional balance transfer APR lets you move existing debt from another card onto the new one at the reduced rate. The balance transfer version is where people save the most money, because that debt was already costing them interest somewhere else.
Cash advances are the main exclusion. They carry their own APR, which is almost always higher than the purchase rate, and interest begins the day you take the advance with no grace period. Before you open an account, federal law requires the issuer to lay out every applicable rate in a standardized table so you can see which transactions get the promotional rate and which do not.1eCFR. 12 CFR 1026.6 – Account-Opening Disclosures
How Long the Rate Lasts
Most promotional periods run between 6 and 21 months. Federal regulations require that any promotional rate last at least six months before the issuer can raise it.2Consumer Financial Protection Bureau. 12 CFR 1026.55 – Limitations on Increasing Annual Percentage Rates, Fees, and Charges The longest offers, typically 18 to 21 months, tend to go to applicants with stronger credit.
One detail catches people off guard. The clock starts when the account opens, not when you activate the card or make your first purchase. If you’re approved in January but don’t use the card until March, you’ve already burned two months of your window.
When the promotional rate is about to expire, the issuer is not required to send a separate 45-day warning if the post-promotion rate was already disclosed in your original account terms.2Consumer Financial Protection Bureau. 12 CFR 1026.55 – Limitations on Increasing Annual Percentage Rates, Fees, and Charges You agreed to the timeline at the start. Put the end date on your own calendar.
Balance Transfer Fees
A 0% balance transfer sounds like free money, but a fee usually comes with the transfer itself. Most cards charge between 3% and 5% of the amount moved. On a $5,000 balance, that is $150 to $250 added to your new balance before you make a single payment. A handful of cards waive the fee entirely, but they are the exception.
The math still works in your favor when the interest you would have paid on the old card exceeds the transfer fee. Carrying $8,000 at 22% APR runs roughly $1,760 in interest over a year, so a 3% fee of $240 is small by comparison — provided you actually use the promotional window to pay the balance down. Where people trip up is transferring a balance, paying the fee, making only minimum payments, and ending up right back where they started once the regular rate kicks in.
0% APR vs. Deferred Interest
This is the single most important distinction in promotional offers, and it costs people the most money when they miss it. True 0% APR and deferred interest look identical on the surface and work in completely different ways.
With a true 0% APR offer, no interest accrues during the promotional period. If a balance remains when the promotion ends, interest applies only to what is left, starting from that date forward.3Consumer Financial Protection Bureau. How to Understand Special Promotional Financing Offers on Credit Cards You are not penalized retroactively for carrying a balance. Most major bank credit cards use this structure.
Deferred interest works differently and is especially common on store credit cards and retail financing. The issuer tracks interest behind the scenes the entire time, even though your statement shows a zero interest charge. If you pay the full balance before the deadline, that tracked interest disappears. If even a dollar remains when the period ends, the issuer adds all the accumulated interest back to your account, calculated from the original purchase date.4Consumer Financial Protection Bureau. I Got a Credit Card Promising No Interest for a Purchase if I Pay in Full Within 12 Months – How Does This Work? On a store card with a 26% APR, a $1,200 purchase financed over 12 months could generate more than $200 in deferred interest that hits the account all at once.
Federal regulations require issuers to print the deferred interest deadline and the total amount of interest accrued so far on the front page of every monthly statement during the promotional period.5eCFR. 12 CFR 1026.7 – Periodic Statement Look for it. If you see a line showing deferred interest building each month, you are on a deferred interest plan, not a true 0% offer.
What Happens When the Promotion Ends
Any balance left on the card when the period expires starts accruing interest at the card’s standard APR. For most cards that rate is variable, calculated by adding a fixed margin to the prime rate.6Consumer Financial Protection Bureau. What Is the Difference Between a Fixed APR and a Variable APR? For promotional cards aimed at applicants with good credit, the post-promotion rate commonly lands somewhere in the low twenties.
The jump from 0% to the low twenties changes your monthly costs quickly. On a $4,000 remaining balance, going from zero to 23% APR means roughly $77 in interest the first month alone, and the figure compounds from there. The point of using a promotional offer well is to clear or substantially reduce the balance before the standard rate takes effect.
How Payments Get Applied
If your card carries multiple balances at different rates, such as a 0% promotional balance and a new purchase at the regular rate, federal rules control how your payments are split. Any amount above the minimum must be applied to the balance with the highest interest rate first, then to the next highest, and so on.7eCFR. 12 CFR 1026.53 – Allocation of Payments>
In practice, your extra payments chip away at the expensive balance before touching the promotional one. That is generally what you want, but it also means the promotional balance sits there unless you pay enough to cover the minimum, the full regular-rate balance, and still have money left over. If you transferred $5,000 at 0% and then started charging groceries at 22%, your payments go toward the groceries first. The transferred balance barely moves until the newer charges are cleared.
There is one exception. During the final two billing cycles before a deferred interest promotion expires, the issuer must allocate any excess payment to the deferred interest balance first.8eCFR. 12 CFR 1026.53 – Allocation of Payments That is a last-ditch protection, and relying on it is risky. If you have a deferred interest balance, pay it down steadily throughout the period rather than hoping to catch up at the end.
How a Late Payment Can End Your Promotion Early
Missing a payment does not just cost you a late fee. If your minimum payment runs more than 60 days overdue, the issuer can revoke the promotional rate entirely and impose a penalty APR on your existing balance.2Consumer Financial Protection Bureau. 12 CFR 1026.55 – Limitations on Increasing Annual Percentage Rates, Fees, and Charges Penalty rates commonly reach 29.99% or higher. The issuer must give you 45 days’ written notice before applying a penalty rate, but by that point the promotional deal is gone.
For payments that are late but under 60 days overdue, the issuer can apply a penalty rate to new purchases going forward but generally cannot retroactively raise the rate on your existing promotional balance. Even so, a slightly late payment can trigger a late fee and show up on your credit report. If you are running a promotional strategy to pay down debt, set up autopay for at least the minimum. Losing a 0% rate eight months early because you forgot a payment is an expensive mistake.
Who Qualifies
The best promotional offers typically require a FICO score of 670 or above, which falls in the “good” range. The longest 0% windows and the lowest balance transfer fees tend to go to applicants with scores in the mid-700s and higher. Applying for a new card triggers a hard inquiry on your credit report, which can lower your score by a few points temporarily.
Most issuers also limit promotional offers to genuinely new customers. If you have held a card from the same bank within the past 24 months, you likely will not qualify for the introductory rate even if you are approved for the card itself. Some issuers go further; one major issuer automatically declines applicants who have opened five or more credit cards from any bank within the past two years.