BNPL Payoff Calculator: Time and Interest to Clear It
See how long a buy now pay later balance takes to clear at a fixed monthly payment, and how much of what you pay is pure interest rather than principal.
Adjust the inputs and select Calculate for a full breakdown.
Year-by-year payoff schedule
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Time to pay off | Total interest | Total paid |
|---|---|---|---|
| $600 · 30% · $60/mo | 1 year | $99.20 | $699.20 |
| $1,200 · 15% · $100/mo | 1y 2m | $108.31 | $1,308.31 |
| $300 · 0% · $75/mo (Pay-in-4) | 4 months | $0.00 | $300.00 |
| $2,500 · 24% · $150/mo | 1y 9m | $571.67 | $3,071.67 |
How This Calculator Works
Enter the balance owed, the effective APR (0% for on-time Pay-in-4; 10% to 36% for longer-term BNPL loans), and the most you can afford to pay each month. The calculator simulates interest and payments month by month and counts the months to payoff.
The Formula
Debt Payoff Time
B = balance, P = fixed monthly payment, r = monthly rate (APR ÷ 12), n = months to clear
Worked Example
A $600 BNPL balance at 30% APR cleared at $60 a month takes about 12 months and adds roughly $99 in interest. On a Pay-in-4 plan at 0% with $150 a month payments, the same balance pays off in 4 months with zero interest — the structural advantage of BNPL when used as designed.
Key Insight
BNPL is two products marketed under one name. Pay-in-4 (Klarna, Afterpay) at 0% is genuinely cheaper than a credit card if every payment lands on time. Longer-term BNPL loans (Affirm, Klarna Financing) at 10% to 36% APR are essentially personal loans with a checkout flow — and the math is the math. Read the term sheet before assuming 'BNPL = free'.
Frequently Asked Questions
Is BNPL really 0% interest?
Pay-in-4 plans usually are — if every payment is on time. Longer-term BNPL loans typically run 10% to 36% APR. Missing payments on any plan can trigger late fees and high deferred-interest charges.
What happens if I miss a payment?
Late fees of $5 to $10 per missed payment, possible reporting to credit bureaus, and — on some plans — retroactive interest. Repeated misses can lock you out of future BNPL approvals.
Does BNPL affect my credit score?
Increasingly yes. Pay-in-4 plans were historically off-credit; major BNPL providers are now reporting to credit bureaus, which means both on-time and missed payments can affect your score.
Is BNPL cheaper than a credit card?
Pay-in-4 at 0% is cheaper than carrying a credit card balance. Long-term BNPL at 30%+ APR is often similar to or worse than a credit card — the convenience cost matters.
Can I prepay a BNPL plan?
Almost always yes, with no penalty. Pre-paying reduces interest on long-term plans and frees BNPL credit limits for future purchases. Pay-in-4 prepayment makes no difference since it is already 0%.
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Methodology & Review
The payoff is simulated month by month: interest is charged on the balance at the lender's APR, the fixed payment is deducted, and the months are counted until the balance reaches zero. Late fees, return fees, and credit-builder add-ons are not modeled. Standard 4-installment Pay-in-4 plans usually charge 0% if every payment is on time — enter the going rate that applies after missed payments.
Written by Ugo Candido · Last updated May 17, 2026.