Compare one payment across two complete paths
A balance-transfer headline is not enough to make a decision. Use a current statement for the balance and APR now in effect, then use the written transfer offer for its fee, minimum fee, promotional APR, exact promotional period, and later APR. The calculator holds the monthly payment constant in both paths so the difference comes from the offer terms rather than from quietly reducing the payment.
The current-card path applies the entered APR to the remaining balance and then subtracts the payment each modeled month. The transfer path adds the greater of the percentage fee or minimum fee to the transferred balance, uses the promotional APR through the entered deadline, and switches any remaining balance to the post-promotion APR. Both paths reduce the final payment to the amount actually due.
Read the offer snapshot before the savings claim
First verify the requested transfer amount, fixed payment, fee, starting transferred balance, promotional terms, and later APR. The fee-rule field states whether the percentage calculation or minimum-dollar fee controls. If any of those values does not match the written offer, the cost comparison is answering a different question.
The model assumes the issuer adds the fee to the transferred balance. If the fee must be paid separately, is withheld from the approved credit line, or is calculated by another rule, adjust the scenario or do not rely on the result. It also assumes the full requested amount transfers successfully.
A 0% offer can still begin with a real cost
The CFPB confirms that an issuer may charge a balance-transfer fee on a zero-percent offer. Adding that fee to the new balance means the transfer path starts above the debt that leaves the old card. Even at 0 percent during the promotion, the fee must be recovered through avoided interest before the transfer produces modeled cost savings.
A percentage fee and minimum fee can produce different results on a small transfer. The structured output shows the actual modeled fee and which rule controlled. Confirm whether the fee itself occupies part of the new credit line because that can reduce the amount available for the transfer.
The fee break-even is calculated month by month
The break-even month is the first modeled month when cumulative current-card interest minus cumulative transfer-path interest equals or exceeds the upfront transfer fee. This method includes any promotional interest and interest later charged on the fee-increased balance. It does not use a shortcut such as fee divided by the first month’s interest difference.
If one path pays off first, its cumulative interest stops increasing while the other path continues. The comparison carries the completed path’s final interest total forward until both paths end. If avoided interest never covers the fee, the result says there is no modeled fee break-even before both payoff paths finish.
Break-even does not mean the account is fully repaid, that a transfer was approved, or that every term is favorable. It answers only when this simplified cumulative interest comparison has recovered the entered fee.
The promotional period is a deadline, not the repayment term
The result separately reports the payment mathematically needed to finish the fee-increased balance within the promotion. It compares that target with the payment already entered, shows the remaining balance at the deadline, and reports the percentage of the starting transferred balance retired by then.
If the entered payment clears the balance early, the later APR has no modeled effect. If a balance remains, the first post-promotion interest amount shows the immediate scale of the rate change. The card balance generally does not become due in full merely because an introductory rate expires; instead, the disclosed later terms apply to the remaining balance unless another account condition changes them.
Copy both the duration and the rate that follows
The CFPB states that the issuer must disclose how long an introductory rate lasts and what rate applies afterward. Its introductory-rate guidance also explains that the rate generally must remain for at least six months, subject to exceptions such as being more than 60 days late, and that an indexed variable promotional rate can still change with its index.
Use the exact duration defined by the offer. It may run from account opening, transfer posting, or another stated date rather than from the first payment you plan to make. A delay between opening and completing the transfer can consume part of the period. This calculator counts full modeled payment months and does not determine the issuer’s calendar deadline.
Late payment and variable-rate terms can change the path
The CFPB’s credit-card agreement guide notes that a promotional APR may be followed by higher long-term APRs and that a missed or late minimum payment can mean losing an introductory APR. The offer and account agreement control the exact consequences. Set payment reminders and verify processing cutoffs rather than treating the modeled promotion as guaranteed.
If the promotional or later APR is variable, this calculator freezes the entered rate. Run a higher later-rate scenario if the remaining balance is material, but do not label that scenario a forecast. A result that depends on an unchanged variable index needs more caution than one that finishes before the promotional deadline.
Approved credit may be less than the requested transfer
This model assumes the entire entered balance moves and the old account receives enough to clear that amount. The actual approved limit, issuer restrictions, transfer caps, fee treatment, or a prohibition on transfers between related issuers may produce a partial transfer or no transfer. Continue required payments to the old creditor until it confirms receipt and the correct remaining balance.
If only part transfers, calculate the old-card remainder and new promotional balance as separate obligations. Do not mark the whole old balance paid or give the entire amount the promotional rate. A transfer that leaves two active balances can require a larger combined payment than the single-path result suggests.
Keep purchases outside the transfer comparison
Cards can apply different APRs to purchases, transfers, and cash advances. The CFPB explains that many issuers calculate interest daily using average daily balances and that payment allocation can depend on rate categories. Its credit-card interest guidance also notes that purchase grace periods do not necessarily operate the same way while a balance is carried.
The calculator assumes no purchases, cash advances, annual fees, late fees, or additional transfers. Using the transfer card for spending can create another rate category and complicate the payoff. Before applying, decide whether recurring charges will be moved elsewhere and how new purchases will be funded.
Read cost and payoff time together
The current path reports first-payment principal and interest, payoff time, total interest, and total paid. The transfer path reports the same core measures plus fee, promotional deadline, and later-rate exposure. The decision panel then labels cost savings or added cost, payoff acceleration or delay, and the fee break-even.
A transfer can save interest yet take longer if its fee raises the balance or if terms differ; this calculator holds payment equal to make that possibility visible. Cost savings do not make an unaffordable payment workable. Place the planned payment in the monthly budget calculator, and compare a fixed-term debt consolidation loan only after matching fees, proceeds, rate type, and payment capacity.
Monthly interest remains an explicit approximation
The model divides each APR by 12 and applies interest before the monthly payment. Actual cards commonly use daily periodic rates, average daily balances, varying cycle lengths, posting dates, payment allocation rules, and issuer-specific rounding. A statement may therefore differ by days and cents even when no new transactions occur.
Save the inputs and compare the next statement with the model. Recalculate when the approved transfer amount, balance, rate, fee, promotion deadline, or payment changes. A scenario is auditable only when the documents and date behind each input are known.
Official references used for this workflow
- CFPB balance-transfer fee explanation for fees on zero-percent offers.
- CFPB introductory-rate guidance for duration, later-rate disclosure, late-payment exceptions, and variable indexes.
- CFPB Know Before You Owe: Credit Cards for promotional rates, transfer fees, required payments, and agreement changes.
- CFPB interest-calculation guidance for daily interest, average daily balances, multiple APR categories, grace periods, and payment allocation.
This calculator provides an educational cash-flow comparison, not a credit card recommendation, approval estimate, offer, disclosure, or financial, credit, lending, tax, accounting, bankruptcy, or legal advice. Verify the approved transfer amount, available credit, fee treatment, promotional deadline, later APR, rate type, payment terms, and account agreement before acting.