Why invoices go late
Ask a finance team why an invoice sat for six weeks and the answer is almost never “we chose not to pay”. It is that the invoice arrived without a purchase order reference, or went to a person rather than the accounts inbox, or said “payment on receipt” which maps to no date in any accounting system.
These are process failures, not disputes. Which is good news: process failures are fixable from your side alone.
The four lines
1. A specific due date
“Due 24 August 2026”, not “payable on receipt” and not “net 30” on its own. A specific date is what makes a payment late, and what a reminder can refer to without sounding aggressive.
2. Their reference, not just yours
Larger organisations cannot pay an invoice their system does not recognise. Ask for the purchase order number before you send anything, and put it where it is obvious.
3. Complete payment details
Account name, number, sort code or routing details, and for international transfers the intermediary bank. Every missing field is another email and another week.
4. What happens if it is late
A short line stating interest on overdue amounts changes behaviour even when it is never enforced. Check your local rules first — several jurisdictions set a statutory rate that may be better than one you invent.
Chasing without damaging the relationship
Send a short, factual reminder the day after the due date, addressed to the accounts inbox with the invoice attached again. No apology, no explanation of your cash flow — just the invoice number, the amount and the date it was due. Most late payments resolve at this step because nobody was refusing, they had simply not seen it.
Escalate to your contact only after the second reminder, and keep it equally factual. The tone that works is the one that assumes an administrative slip, because that is usually what it is.
Set it up before the work starts
Ask three questions at kickoff: who receives invoices, is a purchase order required, and what are your standard terms. Two minutes then removes most of the chasing later. Put the answers in the quotation so both sides have agreed them before there is money at stake.
None of this is legal or financial advice — invoicing requirements differ by country, and it is worth confirming yours once with an accountant.
General information only, not professional advice. Placeholder article written for this build.