Invoice Due Date Calculator (UK)

Not legal advice

This tool gives you an instant estimate to help you understand what you're owed: it's information, not legal advice. We are not solicitors. Figures are only as accurate as what you enter, and statutory rates can change; confirm anything you rely on before sending it to a client or a court.

Work out exactly when an invoice becomes overdue, the first day statutory interest starts accruing, and a suggested chase timeline from there, all from the invoice date and payment terms.

Your invoice

Invoice date

Payment terms

30 days is the UK statutory default if nothing was explicitly agreed. See the note below.

How was the invoice sent? (optional)

The dates

Due date—

First day interest is chargeable—

Send a letter before action from—

Legal note

If payment terms were never explicitly agreed: no contract, no written terms, nothing stated on the invoice, UK law implies a default term of 30 days from the later of the invoice being received or the goods or services being delivered, under the Late Payment of Commercial Debts (Interest) Act 1998. You don't need a signed contract for this to apply. See our guide to getting paid with no written contract for the full picture.

Many freelancers stop tracking due dates like this by hand altogether, and let accounting software such as Sage^(affiliate) flag overdue invoices automatically instead.

Overdue already?

Generate a properly worded chase letter for exactly the stage you're at: statutory interest calculated automatically.

How this is calculated

The due date is simply the invoice date plus your payment terms. Statutory interest under the Late Payment of Commercial Debts (Interest) Act 1998 starts accruing the day after that, and keeps accruing daily until you're paid.

For the current rate and an exact figure, use our late payment interest calculator or read our guide to statutory interest and compensation on late payments. The chase timeline above follows the same escalation sequence, and the wording for each stage, as our complete guide to chasing an unpaid invoice in the UK.

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