View the list of Sample Business Letters Notice of Overdue Account Disclaimer: Be aware that some of these sample letters have legal, financial, or other implications. If you are not sure about the use of any letter, consult with an appropriate professional first. Notice of Overdue Account NOTICE OF OVERDUE ACCOUNT Date: _ To: _ (Customer) The payment due us on _, 19_, in the amount of $_ has not been received. Please give this matter your immediate attention and mail a check without further delay. Very truly, ______________________________