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UK statutory late payment interest: how to calculate 8% + base rate

How UK businesses calculate statutory interest and fixed compensation under the Late Payment of Commercial Debts (Interest) Act 1998, with a reminder template.

For business-to-business contracts in the UK, the Late Payment of Commercial Debts (Interest) Act 1998 lets you claim interest at 8 percentage points above the Bank of England base rate (use the base rate on 30 June or 31 December before the period), plus fixed compensation of £40 (debts under £1,000), £70 (£1,000 to £9,999.99) or £100 (£10,000+). Daily interest = amount × (8% + base rate) ÷ 365. It doesn't apply to consumers.

This is a general summary that may be out of date. Not legal advice. Verify current rules on official government or court websites.

Template

Subject: Overdue invoice [INV-123]: [amount] due [due date]

Dear [Name],

Invoice [INV-123] for [amount] for [services] was due on [due date] and remains unpaid despite my reminders of [dates].

Please pay the outstanding balance [plus interest/compensation permitted by law or our agreement: state the basis] by [date].

If payment is not received by then, I intend to [next step for this jurisdiction] without further notice.

If you dispute any part of the invoice, please tell me in writing by that date.

Regards,
[Your name]

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Tips

FAQ

Can sole traders claim it?

Yes, if both parties are acting in the course of business.

Does it apply to invoices to individuals?

No. For consumers you need a contractual term.

General information and draft wording only. Not legal advice. PaidNudge is not a law firm or a debt collector. Check your contract and local rules, or ask a qualified lawyer, before relying on any late fee, interest or court step.

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