Buy Now Pay Later Calculator

Last updated: April 2026

Purchase And BNPL Type

Purchase amount

GBP

Scheme Details

Instalment period

Late fee per missed payment

GBP

Payments you might miss

Your credit card rate

Used to compare BNPL against using a credit card instead.

Cost Summary

If paid on time, this BNPL costs nothing extra. You pay £300.00 in total.

Instalment Schedule

Payment 118 May 2026£100.00

Payment 21 Jun 2026£100.00

Payment 315 Jun 2026£100.00

Total£300.00

Late Fee Scenario

Missed payments

Late fees

£0.00

Effective APR

0.0%

Total cost with this scenario: £300.00

Comparison Table

Option	Total Cost	APR
Pay upfront	£300.00	N/A
BNPL on time	£300.00	0.0%
BNPL with 1 late payment	£306.00	12.0%
Credit card cleared	£300.00	0.0%
Credit card spread	£311.52	22.9%

FCA Note

From 2026, BNPL providers must be FCA authorised and carry out affordability checks. Always check whether a provider is FCA regulated before using their service.

Is Buy Now Pay Later really free?

Interest-free BNPL schemes are genuinely free if you pay on time. The cost comes from late fees and from interest-bearing schemes where you spread payments over longer periods. Long-term 0% finance can also backfire if the balance is not cleared by the promotional end date.

Does BNPL affect my credit score?

From 2026, BNPL providers will be required to report to credit reference agencies, meaning usage and missed payments may appear on your credit file. Check the terms of each provider before using.

Is a credit card better than BNPL?

A credit card cleared in full each month costs nothing extra and can provide Section 75 consumer protection on purchases over GBP 100. If you carry the balance, credit card APR can be similar to interest-bearing BNPL.

Related calculators:

- Credit Card Repayment Calculator

- Debt Consolidation Calculator

- Personal Savings Allowance Calculator

What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

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