What Happens When a Credit Card Promotional APR Expires?
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When an ordinary promotional APR ends, the stated post-promotional APR applies to any remaining balance according to the account terms. The practical questions are how much balance remains and what payment clears it before expiry.
Ordinary promotional APR model
The calculator applies the entered promo APR for the specified whole months, then switches prospectively to the entered regular APR. It does not add retroactive interest. Interest after expiry is calculated on the then-remaining opening balance under the monthly approximation.
Deferred interest is materially different
Under a deferred-interest offer, failing to satisfy the payoff condition can trigger interest dating back to the original purchase. CFPB guidance describes this distinction. Because contract-specific retroactive accrual requires transaction dates and offer wording, CalculatorGeek does not model deferred interest. Never enter a deferred-interest offer as ordinary 0%.
Read the balance at expiry
A promo can reduce interest while still leaving a large balance. Multiply the planned payment by months only as a rough screen; the exact schedule must also account for transfer fee, promo interest, account fees, minimum overrides, and the final cents balance.
If the result shows a positive expiry balance, run the post-promo scenario at the actual APR and decide whether the payment remains affordable.
Use a payment floor that closes within the window
The calculator’s clear-promo payment is found by cents-based search. It is a planned floor: any higher required minimum overrides it. Start early enough to absorb timing differences and verify the issuer’s exact end date rather than assuming a round number of calendar months.
Check events that can alter the offer
Missed or late payments, failure to complete a transfer by the deadline, transaction type, excluded balances, changes in variable rates, or account closure may affect promotional terms. These are not inferred. Read the written offer and every later notice.
Model both APR phases
Enter the promo rate, remaining months, regular APR and fees in the Credit Card Payoff & Minimum Payment Calculator to see the transition month by month.
Frequently asked questions
Will interest be charged retroactively after a normal 0% APR ends?
Not in the ordinary promo model; the post-promo rate applies going forward. Deferred-interest products are different and must be identified from the offer.
What if the promo expires mid-cycle?
The monthly calculator cannot reproduce a split-cycle daily calculation. Use the exact dates and issuer payoff information for precision.
Does CalculatorGeek recommend a credit card?
No. These resources compare user-entered arithmetic and explain concepts; they do not rank products, predict approval, quote live rates, or recommend borrowing.
Can a calculator replace my statement or payoff quote?
No. Issuers may use daily balances, multiple APR buckets, allocation rules, transaction dates, and residual interest. Use the current statement and request a payoff amount when exact settlement matters.
Sources and review status
- CFPB — Deferred-interest promotions
- CFPB — New purchases after a balance transfer
- CFPB — How credit-card companies calculate interest
- CFPB — Credit-card contract definitions
- MoneyHelper — Managing credit well
- ASIC Moneysmart — Credit-card balance transfers
Sources and model boundaries were checked on 2026-10-07. CalculatorGeek Editorial Team reviewed and approved the full finance and insurance package on 2026-10-08. The cited organizations supplied source material; they did not review or endorse this CalculatorGeek package. Product terms, policy forms, laws, regulatory guidance and rates can change; current written documents and applicable authorities control.
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