Charge what you're legally owed.
Statutory interest and fixed compensation on overdue UK invoices, calculated correctly. With a one-tap PDF demand notice.
The calculation, done right
BoE base rate plus 8%, fixed in six-month windows per the Late Payment of Commercial Debts (Interest) Act 1998. Free web calculators get the rate-change cases wrong. Statute does not.
A demand notice in one tap
A single-page A4 PDF that reads like a solicitor's letter, not a SaaS invoice. Restrained typography, citations to the Act, your bank details for payment.
Tracked daily, on your device
Interest accrues automatically. Notifications at 1, 14, 30, and 60 days late. No accounts, no servers, no tracking — everything stays on your iPhone.
New to this? Read the plain-English guide to UK late payment law — what you can claim, how much, and what to actually say to a client who hasn't paid.
Statute provides calculations based on UK statutory law. It is not legal advice. Calculations are estimates; verify with a solicitor for amounts in dispute.