Late Payment Interest Calculator
Calculate statutory interest and compensation on a late B2B invoice.
Your result
Updates as you type. Based on 2025/26 UK figures where relevant.
How this is worked out
Under the Late Payment of Commercial Debts Act you can charge 8% plus the Bank of England base rate per year, plus fixed compensation of £40, £70 or £100 depending on the debt size.
Tips
- Price from margin, not markup, if you want to hit a target profit percentage.
- Quote prices to businesses ex VAT and to consumers inc VAT.
- You can legally claim statutory interest on late B2B invoices.
Guides for this calculator
- How to Calculate Late Payment Interest in the UK: Step-by-Step Guide
- Late Payment Interest: Common Mistakes, Tips and FAQs
More business calculators
Frequently asked questions
How does the late Payment Interest Calculator work?
Under the Late Payment of Commercial Debts Act you can charge 8% plus the Bank of England base rate per year, plus fixed compensation of £40, £70 or £100 depending on the debt size.
Are statutory pay figures up to date?
Rates are editable on each calculator. Defaults reflect recent published rates; always confirm current figures on GOV.UK.
Do these work for sole traders?
Yes. Margin, markup and break-even apply to any business size.
Is this legal advice?
No. For disputes about pay, redundancy or debts, contact Acas, Citizens Advice or a solicitor.
This calculator gives an estimate for general information. It isn't financial, tax, legal or medical advice. Check official figures on GOV.UK or NHS.uk, or speak to a qualified adviser.