BNPL Calculator

Interest-free is not cost-free

Most BNPL plans genuinely charge no interest if every instalment is paid on time. The revenue comes from two places: merchant fees of typically 2 to 8 percent, which are built into prices everyone pays, and late fees charged to users who miss a payment. The advertised zero percent is real for the disciplined and irrelevant for anyone who slips.

Late fees are enormous relative to the amount

A fixed late fee of 6 or 8 on a 40 instalment is an effective rate far above any credit card, because the fee does not scale down with the small balance. Two missed payments on a modest purchase can add 20 to 40 percent to its cost. Judge BNPL on the fee structure and your confidence in the payment dates, not on the headline rate.

Stacking is the real hazard

The mechanism that causes harm is not one plan but several. Each is individually small and easily affordable, and because approval is instant and often does not involve a hard credit check, there is no natural brake. Four concurrent plans produce a stream of payments on different dates from different providers with no single view of the total. Regulatory reviews in several countries have identified this as the main driver of BNPL-related arrears.

Credit reporting is inconsistent

Some providers now report to credit bureaux and some do not, and this is changing. Missed payments increasingly appear on credit files, while on-time payments often do not, giving asymmetric downside. Some mortgage underwriters treat active BNPL commitments as a negative signal about cash flow management regardless of payment history.

When it makes sense

Spreading a genuinely necessary purchase you could afford outright, to smooth cash flow across a month, with the payment dates diarised. It stops making sense when it is what makes the purchase possible at all. The honest test is whether you would buy the item if you had to pay the full amount today. If the answer is no, the instalment plan is not helping you afford it, it is helping you overspend.