Balance transfer payoff calculator

How this calculator works

This calculator compares two payoff paths for the same credit card balance and fixed monthly payment: staying at your current APR versus transferring to a promotional rate with a transfer fee. Enter current balance, current APR, promotional transfer APR, transfer fee percentage, promotional period length, APR after promotion ends, and monthly payment.

Both scenarios use identical monthly payments. The current path applies your current APR every month. The transfer path adds the transfer fee to starting balance, applies the promotional APR during promo months, then switches to the post-promotion APR for remaining months until payoff or until payment cannot cover interest.

Each month, interest accrues on remaining balance, then the payment reduces principal. If payment does not exceed interest, payoff is not reachable and the scenario reports that outcome.

Outputs include estimated interest saved, payoff months for each path, transfer fee, and total interest under current vs. transfer scenarios. Interest saved is the difference when transfer total interest is lower.

The model does not include new purchases, late fees, penalty APRs, or credit score effects from opening a new account.

What affects the result

Seven inputs determine whether a transfer wins on interest and time.

• Current balance sets principal on the stay path and fee calculation on the transfer path.
• Current APR drives interest if you do not transfer. High 20%+ rates make transfers more attractive when promo terms are strong.
• Promotional transfer APR is often 0% for intro offers. Lower promo rate reduces interest during the promotional window.
• Transfer fee—commonly 3% to 5%—adds to balance immediately. On $6,800, a 3% fee adds $204 to repay.
• Promotional period length sets how long the low rate applies. Payoff within promo avoids post-promo APR on remaining balance.
• APR after promotion applies when balance remains after promo ends. High revert rates erode transfer savings.
• Monthly payment must exceed interest for payoff to progress. Higher payments finish within promo and reduce post-promo exposure.

A transfer can save interest even with a fee if promo rate and payment level keep total interest below the current-path total.

Real-world examples

1. Strong transfer candidate. $6,800 at 24.99%, 0% promo for 18 months, 3% fee, 24.99% after promo, $250/month payment. Transfer path often shows lower total interest and similar or faster payoff if payment clears balance near promo end—verify with your inputs.

2. Payment too low. $150/month on $8,000 at 27% may show not reachable on one or both paths. Raise payment before comparing transfer value.

3. Short promo, slow payoff. 0% for 12 months with $200/month on $5,000 may leave balance when 24% post-promo kicks in, reducing or eliminating interest savings.

4. Stay vs. avalanche. Transfer optimizes one account; debt payoff calculator orders multiple debts. See balance transfer vs. avalanche for combined strategy.

Common mistakes

• Ignoring the transfer fee in mental math. Fee is real debt added day one.
• Assuming promo lasts the whole payoff. Model post-promo APR if payment extends beyond intro period.
• Missing payments on transfer cards. Late payment may void promo rate instantly.
• Adding new charges to the transfer card. Purchases complicate payoff and may accrue different rates.
• Transferring without a payoff plan. Promo rates reward disciplined fixed payments.
• Opening transfers repeatedly without paying down. Fees and inquiries add up.

When to use this calculator

Use this calculator when you receive a balance transfer offer and want to compare total interest and payoff time against keeping the balance on your current card. Run it with the payment you can actually sustain—not a best-case stretch.

Pair with the credit card payoff calculator for single-card planning without transfer. Use debt payoff calculator for multi-debt avalanche or snowball. Read paying off debt and APR vs. APY for broader context on rates and strategy.

Frequently asked questions

Is a 0% balance transfer always better than staying on my current card? Not necessarily. Balance transfer cards charge a fee — typically 3% to 5% of the transferred balance — that adds to your debt on day one. If your current APR is already low, or if the promotional period is short relative to your payoff timeline, the fee may exceed the interest you save. The calculator shows total interest paid on each path so you can see the actual math for your specific rate, fee, and payment level rather than assuming the transfer always wins.

What happens if I miss a payment on a balance transfer card? Most promotional APR offers include penalty clauses: a single missed or late payment can void the promotional rate immediately and reset your interest to the card's standard APR — sometimes 25% or higher. This calculator assumes every payment is made on time. If your payment history is inconsistent, factor that risk into your decision, since losing the promotional rate can make the transfer more expensive than staying on your original card.

Can I make new purchases on the balance transfer card? Technically yes, but doing so is generally a mistake. Most cards apply payments to the lowest-APR balance first. New purchases at the regular APR accumulate behind the transferred balance and continue accruing interest. This calculator models the transferred balance in isolation; adding purchases makes actual payoff more complex and more expensive than the output shows.

What is the post-promotional APR and why does it matter? The promotional period has a fixed end date — typically 12 to 21 months. Any balance remaining when the promotion expires reverts to the card's standard APR, which may be as high as your original card. If your monthly payment is too low to clear the balance within the promotional window, post-promotional interest can erode or eliminate your savings entirely. The calculator models this rate transition so you can see exactly when and how the revert rate applies to any remaining balance.

How do I know what transfer fee percentage to enter? Check your balance transfer offer letter or the card's terms and conditions. Most major issuers charge 3% to 5% of the transferred amount, though some waive fees for specific card tiers or during promotional windows. Enter the exact percentage from your offer — even one percentage point changes the break-even significantly on large balances.

What if my payment is too low to cover monthly interest? The calculator reports that payoff is unreachable for that path when your payment falls below monthly interest — meaning your balance would grow, not shrink. Raise your monthly payment until both scenarios show a finite payoff timeline before evaluating transfer savings. If current payments feel unmanageable, read paying off debt for strategies when minimum payments dominate your cash flow.

When does it make sense to skip the transfer and use a personal loan instead? A personal loan at a fixed rate — typically 10–20% for good credit — can beat a balance transfer when the transfer offer carries a high fee, the promotional period is short relative to your payoff timeline, or you have multiple cards to consolidate into one payment. Personal loans also carry a fixed term and payment, which can improve budgeting predictability compared to flexible credit card payments. Use the personal loan calculator to compare total interest on a consolidation loan against the transfer path.

Related calculators

Plan single-card payoff without a transfer decision using the credit card payoff calculator — estimate payoff months and total interest at your current APR and payment. Compare snowball and avalanche across multiple debts with the debt payoff calculator. Build a structured snowball payoff schedule with the debt snowball calculator. Track overall credit utilization with the credit utilization calculator. Evaluate debt consolidation into a single loan with the personal loan calculator.