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The invoice is late. What do they owe you now?
Enter the amount, the due date, and your late-fee terms. Get days overdue, interest accrued, and the total now owed — plus the reminder line to send with it.
The invoice
How contracts usually word it — charged per month or part month overdue. 1–1.5% is the common range.
The one-off fee is optional — UK statutory rules add fixed compensation of £40, £70, or £100 per invoice depending on the debt size.
The damage
Total now owed
$2,030USD
$30 in late charges — 1.5% of the original invoice.
The reminder to send
A quick reminder — our invoice for $2,000 was due on June 6, 2026 and is now 30 days overdue. As set out in our agreement, late-payment interest of 1.5% per month applies, bringing the balance to $2,030. Could you let me know when I can expect payment?
Only charge what your contract (or local statute) actually grants — see the questions below.
Common questions
Can I charge interest on a late invoice?
If your contract has a late-fee clause, yes — that's what it's for. Without one it depends where you are: UK and EU business-to-business debts carry statutory interest by law, the US has no federal right (state rules vary), and Australia generally requires the contract to say so. Check your local rules, and put a late-payment clause in every contract going forward.
What late fee do freelancers usually charge?
1–1.5% per month is the common range — roughly 12–18% a year. It's high enough that lateness costs something, and low enough to stay reasonable and enforceable. Some jurisdictions cap contractual interest, so check before you go higher.
How is late payment interest calculated?
Two conventions cover almost every contract. Monthly: the rate times the invoice amount, charged per month or part month overdue (1.5% on $2,000 at 45 days overdue = 2 months = $60). Annual, statutory style: amount × annual rate × days overdue ÷ 365. Both are simple interest on the original amount, not compounded.
What is statutory late payment interest in the UK?
For business-to-business debts, the Late Payment of Commercial Debts (Interest) Act 1998 grants 8% a year plus the Bank of England base rate, and a fixed compensation fee per invoice: £40 for debts under £1,000, £70 up to £10,000, £100 above that. Use the annual method in this calculator and check the current base rate before you send the figure.
Can I add a late fee retroactively?
Not credibly. You can only charge what the contract established when the work was agreed — or what statute grants you. If your current agreement is silent, chase the invoice without the fee, and add a late-payment clause to your contract for the next project.
Do late fees actually get invoices paid?
The consistent reminder does most of the work — the fee gives it teeth and compensates you for the wait. What moves the number is chasing every overdue invoice, every time, without the awkwardness. That's a process problem, and it's automatable.
Next step
Never chase an invoice by hand again.
Kinako watches your due dates, flags what’s overdue, and sends the polite-but-firm reminders for you — so the awkward email goes out every time, without you writing it.