A £5,000 invoice 90 days late is worth £218 to you

Late Payment Interest Calculator

Work out what a late commercial invoice is actually worth. Base rate plus 8 per cent, plus a fixed sum of £40, £70 or £100 by invoice size.

Free tool

Late Payment Interest Calculator

Statutory interest on a late commercial invoice is a right, not a favour. Base rate plus eight per cent, plus a fixed sum per invoice.

The invoice
£
From the day after the terms ended.
%
The rate on the preceding 30 June or 31 December.
You can add

-

Interest rate
Daily interest
Interest to date
Fixed sum
As a share of the invoice
If it runs another 90 days

Three things worth knowing

The fixed sum is £40 under £1,000, £70 up to £10,000 and £100 above. Per invoice, not per client, and you can claim reasonable recovery costs on top.

The rate is fixed at the base rate in force on the preceding 30 June or 31 December and stays there for the whole debt.

You cannot claim statutory interest if the contract sets its own rate, and you have six years from the day after the payment terms ended.

The same sum, in a workbook

With the daily figure, so a chaser can quote what another month costs.

Download the workbook Free Excel workbook, no signup. Current for 2026/27.

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