Invoice due date & B2B late-payment interest
Compute the due date of an invoice (30 days, 60 days, end of month…) and then the legal B2B late interest at the Belgian or French rate, with the flat 40 € compensation. The base follows EU directive 2011/7/UE and the national rules — the law of 2 August 2002 in Belgium, L441-10 in France — and the central-bank base rate runs +8 points in Belgium and +10 in France. An invoice due date is a private figure, and the result stays on your device.
- 100% local
- Free · no account
- Instant result
This tool runs entirely in your browser — nothing is sent to a server.
In B2B, an invoice unpaid at its due date entitles you, with no prior formal demand, to late-payment interest and a flat €40 recovery indemnity (Directive 2011/7/EU, transposed in Belgium by the law of 2 August 2002 and in France by article L441-10 of the Commercial Code).
The statutory rate is revised every half year: the ECB reference rate plus 8 points in Belgium and 10 points in France. This tool first computes your invoice due date from the agreed term (30 days, 60 days, end of month…), then the accrued interest and the total you can claim. The rate is adjustable if your general terms set a different one.
How it works
Type the figures or drop the file you want to process — the tool checks them as you go.
Everything is computed directly in your browser. Nothing is sent to a server.
The result appears instantly, with the detailed breakdown ready to copy, download or keep.
Why use this tool
No account, no download, no limit: the result appears as soon as you enter your data.
Every rule, algorithm and check reflects what we use ourselves every day at Flexina.
The calculations follow the official standards, and the step-by-step detail lets you double-check the outcome.
What does running it locally bring you?
Files, figures and documents never leave your device: nothing is stored, nothing is sent.
Once the page is loaded, you can cut the network: the tool keeps working.
No upload, no account, no third-party server in between: results stay fast and fully private.
Frequently asked questions
From when does interest run?
From the day after the due date, automatically: no formal demand or reminder is needed in B2B (unlike consumer relationships).
What is the maximum allowed payment term?
In Belgium as in France, 60 days maximum between companies (or 45 days end of month in France if the contract so provides). Without a mention, the default term is 30 days.
Is the €40 indemnity automatic?
Yes, it is due automatically for each unpaid invoice, in Belgium as in France. If your actual recovery costs are higher, the difference can be claimed with supporting documents.