Late Payment Calculator

Calculates statutory interest under the Late Payment of Commercial Debts (Interest) Act 1998

Enter your invoice amount and due date. The calculator fetches the current Bank of England base rate automatically and shows exactly what you can claim — statutory interest, fixed compensation, and the total.

Enter invoice details

Invoice amount (£)

Number of invoices

Payment due date

Calculate interest to

The statutory interest rate is fetched automatically from the Bank of England. You can override it below if needed (e.g. for a historical date).

Override base rate (%) — optional

Enter the invoice amount and due date above to see your calculation.

About these amounts

Under the Late Payment of Commercial Debts (Interest) Act 1998, you are entitled to claim:

Statutory interest — currently 8% above the base rate per year, accruing automatically from the date payment was due
Fixed compensation — £40 for invoices under £1,000; £70 for £1,000–£9,999; £100 for £10,000 or more — per invoice, no court order needed
Reasonable recovery costs — if your actual recovery costs exceed the fixed compensation sum

These amounts do not require a court order. Include them in your letter before action. For a full explanation, see our statutory interest complete guide.

Multiple invoices

Fixed compensation is claimable per invoice, not per debtor. If a customer has three unpaid invoices of £15,000 each, you can claim £100 compensation on each — £300 total. Use the "Number of invoices" field above to calculate the combined compensation. For invoices with different amounts or due dates, calculate each separately.

If the invoice is disputed

Statutory interest and fixed compensation are not generally claimable on invoices that are genuinely disputed. If the other side is contesting the work, the amount, or the contract, the right route is to resolve the underlying dispute first. A private neutral decision process at Dispute Neutral handles exactly this — a binding decision in 10 business days. See our unpaid invoice recovery guide.

Ready to recover what you are owed?

Dispute Neutral is a private, fixed-fee binding process for commercial debts under £150,000.

Start a matter →

Private • Fixed-fee • Binding decision in 10 business days