Free calculator

Late payer? Work out what you can claim.

UK law lets you charge interest and a fixed fee when a business pays you late. Put in the invoice and get the figures, plus a letter ready to send.

Who is the customer?

A business A homeowner

Invoice total

Invoice number

Payment was due

Work it out to

Bank of England base rate

3.75% was the rate on 30 June 2026, which applies to debts that went overdue between 1 July and 31 December 2026. For an older debt, use the rate on the last 30 June or 31 December before it went overdue.

Your business name

Customer name

What you can claim

Now owed£0

Your letter

Letter tone

Friendly reminder Formal claim

Letter text, edit before sending

Edit anything before you send it. Start friendly; most people pay once they're reminded.

Never chase an invoice by hand again

AdminJim sends invoices the day the job's done and polite reminders until they're paid, so you don't have to make the awkward call.

See how AdminJim works

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