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[Your Name]
[Street Address]
[City, State ZIP Code]
[phone number - optional]
[email address - optional]

[Name of Recipient]
[Title]
[Company Name]
[Street Address]
[City, State ZIP Code]

Ref: [Account/Invoice Number]

Dear [Name of Recipient]:

Thank you for doing business with us. We appreciate having the opportunity to serve you.

However, in reviewing your account details, it has come to my attention that your payment is overdue. Your current balance of [Amount Due] was due on [Due Date].

I am sure that this is simply an oversight, and if your payment has already been mailed, please disregard this notice. Otherwise, for your convenience, I have included a duplicate copy of your invoice. Please remit your payment as soon as possible

In the meantime, I thank you again for being a valued customer. If you have any questions or concerns regarding this matter, please do not hesitate to contact us