[Your Company Letterhead]
[Your Name]
[Your Position]
[Your Company Name]
[Your Company Address]
[City, State, Zip Code]
[Email Address]
[Phone Number]
[Date]
[Client's Name]
[Client's Company Name]
[Client's Address]
[City, State, Zip Code]
Dear [Client's Name],
I hope this message finds you well. I am writing to remind you that the balance payment of [insert amount] for [specific service or product] is still