See what a Pay-in-4 or monthly BNPL plan really costs for a Black Friday or Christmas purchase – payments, interest, late fees – compared with a credit card.
By TanLabs Editorial Team · Reviewed: page results cross-checked against the free spreadsheet · Last updated · Runs in your browser – nothing you type is sent anywhere
With purchase price $400, number of payments 4, weeks between payments 2, plan APR 0%, late payments 0, late fee each $7, credit card APR to compare 22%:
4 payments of $100.00 every 2 weeks · total $400.00
Extra cost over the price: $0.00 · same plan on a 22% card: $8.50 interest · last payment in about 6 weeks
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Periodic rate r = APR × weeks between payments ÷ 52. Payment = price × r ÷ (1 − (1 + r)^−n); with 0% APR it is price ÷ n. Total = payment × n + late payments × late fee.
Formula source: Installment amortization with a per-period rate (APR × weeks ÷ 52), the actuarial method of Regulation Z; 0% plans split the price evenly. CFPB Regulation Z, Appendix J – actuarial (amortization) method · CFPB – Buy Now, Pay Later: market trends and consumer impacts
Written and checked by the TanLabs Editorial Team · Last updated
Same $400 Black Friday purchase, $7 late fee:
| $400 purchase | Each payment | Total paid | Cost above price |
|---|---|---|---|
| Pay in 4, on time | $100.00 | $400.00 | $0.00 |
| Pay in 4, one late payment | $100.00 | $407.00 | $7.00 |
| 6 monthly payments at 0% | $66.67 | $400.00 | $0.00 |
| 12 monthly payments at 20% APR | $37.05 | $444.61 | $44.61 |
| 24 monthly payments at 30% APR | $22.36 | $536.65 | $136.65 |
Pay in 4 really is free when every payment is on time. Longer plans with an APR cost real money: 24 months at 30% adds about $137 to a $400 purchase, a third of the price.
Pay-in-4 plans are usually interest-free if every payment is on time. Longer monthly plans often charge APRs similar to credit cards.
Some providers report payments to credit bureaus, and missed payments can be sent to collections. Check the provider's terms before you sign up.
Most providers charge a late fee and may pause your account. Some cap the fee as a share of the order.
You usually keep paying until the store processes the return, then the plan is adjusted or refunded. Keep the receipts.
It can, but splitting everyday spending into loans is a warning sign that the budget needs attention.
In the US the CFPB oversees BNPL lenders; read its guide before you sign up.
Sources: CFPB – Buy Now, Pay Later: market trends and consumer impacts