Calculate interest and compensation on an unpaid business invoice
Estimate statutory interest, fixed compensation and recovery costs across one or more overdue invoices.
Indicative claim estimate
Takes about 2 minutes
No account needed
No email needed
No action authorised
Estimate four parts of a potential claim
Calculate one invoice or a complete overdue account
Enter the Bank of England base rate you want to use. The calculator automatically adds the statutory 8% uplift, then calculates each invoice separately using its value and due date. Add further lines to group several months or invoices into one calculation.
Enter the account details
Use one line per invoice or monthly balance. Additional lines stay hidden until you select the plus button.
Group monthly debts: use one line for each invoice or month.
Estimated account total
| Line | Reference / month | Invoice value | Due date | Days overdue | Annual rate | Interest | Compensation | Line total |
|---|
Indicative calculation only. Check the Bank Rate, dates, contract and entitlement before relying on the figures.
Would you like us to review and recover the debt?
Download the schedule for your records or include it when submitting the debt. We will check the figures and supporting documents before taking recovery action.
What may be recoverable on a qualifying late business debt?
Depending on the contract and the circumstances, a creditor may be able to claim more than the unpaid invoice balance.
The calculation starts with the unpaid principal, including VAT where it forms part of the debt.
For qualifying business debts, statutory interest is normally 8% above the applicable Bank of England base rate. In this calculator, you enter the Bank Rate and the tool automatically adds 8%. Use separate batches where different invoices require different historical reference rates.
The fixed sum is calculated separately for each qualifying late invoice or payment, based on its value:
- Debt below £1,000
- £40
- Debt from £1,000 to £9,999.99
- £70
- Debt of £10,000 or more
- £100
It is not normally one charge for the whole customer account or calculator batch. Each invoice must independently qualify.
Reasonable additional recovery costs may be relevant in some cases, but they should be evidenced and reviewed before being claimed.
Check the entitlement as well as the arithmetic
An incorrect due date, debtor category, contractual assumption or statutory reference period can overstate the claim, create a dispute and delay recovery.
Risks of relying on the calculation alone
What we would review
What can you do with the calculation?
The next step depends on the debtor’s response, the evidence, any dispute, the value of the debt and whether recovery remains commercially proportionate.
Recovery methods
Suitability checks
Calculators and support
Professional commercial debt recovery, with clear safeguards
HK Commercial Debt Recovery combines commercial credit expertise with transparent terms, appropriate insurance and registered data-protection controls.
HK Commercial Debt Recovery is a trading name of HK Credit Services Ltd, Company No. 17265874, registered in England and Wales. Using this calculator does not instruct recovery action.
Get the figures and recovery position checked
Request a free review of the principal, interest, compensation, supporting documents and most proportionate recovery route before making a formal claim.
Submitting the debt does not authorise legal or enforcement action. Any proposed escalation will be explained before you decide whether to proceed.