State a date, not only a phrase
“Net 30” may be familiar, but an explicit due date makes the request clearer. Put the issue date and due date near the total. Where payment is linked to delivery, acceptance or a milestone, reference the agreed document or milestone name.
Make the payment route easy to identify
Show the payee name, payment reference or invoice number to use, and the payment method you accept. For a business customer, include the purchase order or contract reference where one exists. This prevents a paid amount from sitting unmatched in the bank statement.
Use a calm reminder sequence
Schedule a reminder shortly before the due date, a polite message on the due date and an escalation process after it. Keep notes of commitments made by the customer. The purpose is to protect cash flow while preserving a professional relationship.
Match terms to the risk
For customised goods or project work, deposits and milestone billing may be more appropriate than one final invoice. For repeat customers, a credit limit or account review may be sensible. Contract terms, late charges and remedies have legal implications—use legal advice when you create or change them.
Sources and further reading
General operational guidance only; contracts and statutory obligations need qualified advice.