Q: Can I charge interest on a late invoice in the UK?
Yes. If both you and your client are businesses, the Late Payment of Commercial Debts (Interest) Act 1998 gives you an automatic right to charge statutory interest and fixed compensation on late payment. It doesn’t need to be in your contract.
Q: How much interest can I charge?
8% per year plus the Bank of England base rate, calculated daily as simple interest. The base rate used is the one in force on 31 December or 30 June before your invoice became overdue.
Q: What is the fixed compensation?
A one-off sum you can add to each late invoice: £40 for invoices under £1,000, £70 for invoices from £1,000 to £9,999.99, and £100 for £10,000 or more. It applies even if payment is only a day late.