Timing is critical when sending payment reminders. Here are some best practices:
Before the due date: Send a reminder a few days before the payment is due to give the customer a heads-up. On the due date: Send a reminder on the due date as a final notice. After the due date: If the payment is overdue, send reminders at regular intervals (e.g., 7 days, 14 days, 30 days past due).