[Your letterhead, if desired; if not, your return address]

[Date of letter-month, day, and year]

[Recipient's first and last names]
[Company name]
[Street or P.O. box address]
[City, State ZIP code]

Dear [recipient's name]:

I am writing to confirm a payment plan that I set up with your company via phone conversation on March 20, 2011. According to the terms on which we agreed, I will pay $40 per month for the next 6 months, no later than the 15th of each month. I understand that this amount includes a service charge and interest fee. I will call your company immediately if I need to change this payment plan.

If you have any questions, please call me at (215) 555-1212. Thank you for your time and consideration.

Sincerely,

[Signature]

[Sender's first and last names]