UK freelancers and small businesses chasing an overdue invoice who want the exact statutory amount, not a guess.
How it works
- Name this chase, e.g. "Invoice 0042".
- Enter the invoice amount, the current Bank of England base rate, and days overdue.
- Get the statutory interest, the fixed compensation band, and the total you can chase.
What you gain
- Uses the UK's OWN Late Payment of Commercial Debts (Interest) Act 1998 - Bank of England base rate plus 8% simple interest - not the EU Late Payment Directive, which is a different law with a different rate
- Fixed compensation banded by debt size (£40 under £1,000, £70 from £1,000 to £9,999.99, £100 at £10,000 or more) - both interest AND fixed compensation are claimable on the same invoice
- Interest is simple, not compounding, calculated per day overdue - the exact amount, not a rounded guess
- Chases saved by name: recalculating updates the same chase, not a duplicate
Screenshot

Technical details
How to set up & use
- Buy the license — your key (lic_...) appears on the order page and in your email.
- Sign in at app.synoriaai.com with your license key.
- No installation — the product runs in your browser, on your own isolated instance.
Frequently asked questions
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