How to Word Your Past Due Letter - Funding Gates Blog 90 Days Past Due Letter. Invoices that are between 90 and 120 days past due are significantly more difficult to collect on. Your payment reminders for invoices in this category should be quite firm, formal, and utilize tactics to get their attention like bolded text or enlarged fonts. Collection letter example for overdue tuition fee Constantly remind the customer that your payment is due or past due and request him/her to pay you immediately. Use a polite tone to avoid hurting your relationship with the customer. Include the amount of debt the customer must pay and indicate the next deadline.
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