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A late invoice is never just late. While you wait, the money is doing three quiet jobs it should not be doing: earning nothing instead of the interest it could, consuming your hours in reminders and awkward emails, and punching a hole in your cash flow that your overdraft or credit card dutifully fills at their own rates. The direct interest on a late payment is often modest — but the full cost, including the chasing time and the financing gap, is what makes slow payers genuinely expensive clients. This calculator shows the interest arithmetic clearly, and the verdicts remind you why the real defence is written payment terms agreed before the work starts, not a strongly-worded email after it is overdue.
A late invoice costs more than the overdue amount — there is lost interest, chasing time and the quiet tax of uncertainty. See the real price of a late payment in plain numbers.
In many places, yes — the UK and EU allow statutory interest and recovery fees on late business payments, and in the US your written contract governs. The key is having the terms agreed in writing before the work starts; interest discovered at invoice time is hard to collect.
A frequent approach is 1.5% per month on overdue balances — roughly eighteen percent a year — which is steep enough to be taken seriously but defensible as a commercial rate. Statutory schemes in some countries set their own figures.
Do not wait at all — send a friendly reminder the day after the due date, as a routine rather than a reaction. Collection odds fall sharply the longer an invoice sits, and early polite structure collects far more than late anger.
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