Estimate
Enter invoice details, dates and an annual rate to estimate days overdue, interest and fixed compensation.
LATE PAYMENT TOOL
A focused tool for overdue business invoices.
Estimate late-payment interest, fixed compensation and generate a professional reminder letter, supported by practical guidance and visual explainers.
Live tool
Built as part of the SystemStudio toolbox — practical tools
and visual references for clearer financial and operational
work.
RESOURCE HUB
Everything in the Late Payment Tool area
Tool
Late Payment Tool
Estimate late-payment interest, fixed compensation and generate a professional reminder letter for an overdue business invoice.
Open tool →Guidance
Late Payment Guidance
Plain-English notes to help users understand how to use the calculator carefully.
Read guidance →Visual guide
Compensation Bands
A visual explanation of the fixed £40, £70 and £100 debt recovery cost bands.
View guide →Visual guide
Reminder Timing
A practical guide explaining why the calculation date should be updated before sending follow-up reminders.
View guide →HOW IT FITS TOGETHER
From invoice details to next action
Review
Check the result carefully and make sure the dates, rate and invoice amount match the situation.
Generate
Create a professional reminder letter in a polite, firm or final notice tone.
Update
If a follow-up reminder is sent later, update the calculation date because interest may have increased.
USE CAREFULLY
What this tool is — and is not
The Late Payment Tool is designed to make a common business admin task clearer and easier to approach. It provides an estimate and a practical letter draft based on the details entered.
It is not a substitute for professional advice, and it does not check contract terms, disputes, part-payments, unusual payment arrangements or every possible legal circumstance.
Practical reminder:
Before sending a letter, users should review the invoice
details, dates, rate, customer relationship and wording
carefully.
NEXT ITERATIONS
Possible future improvements
More letter variations
A clearer calculation breakdown
Printable/downloadable summaries
More late-payment guidance pages
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