[Your Name]

[Company Name]

[Street Address]

[City, ST ZIP Code]

[Date]

[Recipient Name]

[Title]

[Company Name]

[Street Address]

[City, ST ZIP Code]

Dear [Recipient Name]:

We inadvertently over billed you on the invoice dated [date], by $[amount]. Enclosed is a check for that amount. Please accept our apologies.

Sincerely,

[Your Name]

[Title]