Review the letter and publication(s) that were sent to you by the IRS department making the decision.
These will tell you:
How to prepare a request for an appeal (protest)
Where to mail the request
When the request must be received
What information you need to include in the request for an appeal
For specific information appealing Examination issues, refer to the Examination page.
For specific information appealing Collection issues, refer to the Collection page.
FILING A REQUEST FOR APPEALS DOES NOT STOP INTEREST AND PENALTIES FROM ACCRUING
Interest and certain penalties will continue to accrue during the Appeals process and during any subsequent Appeals to the Courts on any amount not paid. In order to stop the accrual of interest and penalties on proposed adjustments, refer to Notice 1016, How to Stop Interest. For an explanation on how to stop interest from accruing on an unpaid balance, refer to Publication 594, What You Should Know About the IRS Collection Process.