The IRS uses Letter 2271C to accept or change your request for an installment payment agreement for your back taxes & it gives instructions for what to do. It tells you the due date of your payments, the amount of the monthly payment, the fee for granting an agreement & other important instructions. After this letter you will start receiving monthly bills (Notice CP521).
If you lose the Letter you can always go to IRS.gov & get instructions to make payments by check or electronically. Here are the addresses to send your payments.
Respond to Letter 2271C
Remember, if you can't make the payment for some reason you can resubmit another Form 433F or Form 433A (with all the evidence) to show that you can't make the payment.
It also helps if you can gather evidence of medical, legal, health or other major problem for you, your family or children. This aids in repelling IRS collections as well as making a Penalty Abatement Request.
You can always call us or take our webinars to help you complete these lengthy & complicated forms.