Formal reminder letter is send to the business partner who is late with payment of invoice (s). Asking for a late payment is tough, and unpleasant thing, but shortages of cash, may significantly disturb operations of the company. Usual business practice is to send reminder for delayed payments in the following timeframe: a week before the Due Date on the day the Payment is Due a week after late Payment was Due 2 weeks after late Payment was Due one Month After Late Payment was Due These five reminders for payment can be sent by email, or using semi-formal letter. If you still haven’t received payment after these 5 reminders, it is time to send a formal reminder for payment of outstanding amount. If