Good follow-up is specific: name the invoice, amount, due date and next action. Before escalating, check the contract, delivery record and customer contact details.
Begin with a neutral check-in
Ask whether the invoice reached the right person and attach a clean copy with the reference and due date.
Make the requested action clear
Request a payment date or details of any dispute rather than sending a vague “just following up” message.
Escalate consistently, not emotionally
Use a documented timetable and pause work only where the agreement and applicable law allow it.