Free tools · No signup
Tools for UK businesses chasing overdue invoices.
Free calculators and templates for the once-in-a-while late payment. No signup, no email capture — just paste your figures and get the answer.
UK Statutory Interest Calculator
Work out exactly how much late-payment interest you're legally entitled to under the Late Payment of Commercial Debts (Interest) Act 1998. Includes the compensation tier.
Late Payment Letter Generator
Generate a formal late-payment demand letter citing the 1998 Act, with the interest figure pre-calculated. Copy-paste ready.
Chase Email Writer
Pick a tone (friendly, neutral, firm, final) and an invoice — get a copy-pasteable draft email with statutory interest wording optional.
DSO Calculator
Paste a few invoices and see your average Days Sales Outstanding plus a benchmark against UK SMB averages.
Want this automated?
Zentra Collect does all this every day, on every invoice.
Upload your overdue invoices → get a ranked chase plan with action, reason, and draft message. Statutory interest, payment portal, and stop-chasing intelligence built in.
These tools are estimates, not legal or accounting advice. Always verify with a qualified professional.