1. Check the invoice first and make sure the amount, due date, payment link and client information are correct.

2. Send a short, neutral reminder as soon as the invoice becomes overdue.

3. Keep emotion out of the message; your goal is payment, not an argument.

4. Refer back to the payment terms the client already agreed to.

5. Ask whether anything is needed from your side to help accounting process the payment.

6. Use automated invoice reminders so follow-up happens consistently.

7. Pause additional work if the client remains overdue and your agreement allows it.

8. Do not keep increasing your unpaid exposure by continuing to work indefinitely without payment.

9. For appropriate projects, hold final files, ownership or delivery until the agreed balance is paid.

10. If a good client has a temporary cash-flow problem, consider a structured payment schedule instead of reducing your fee.

11. Apply late fees only when they were agreed to in advance and are legally appropriate.

12. Keep copies of contracts, invoices, emails, reminders, payment promises and completed work.

13. Watch for patterns such as chronic late payment, refusal to pay agreed rates or repeated excuses.

14. If the payment problem continues, consider ending the relationship professionally and according to your agreement.

15. Use every late-payment experience to improve your future systems: stronger deposits, clearer due dates, milestone billing and better invoicing procedures.