If you disagree with an IRS tax adjustment, you have the right to appeal the decision through the IRS Office of Appeals. The first step is to file a written protest within the specified timeframe, typically 30 days from the date of the notice. Your protest should clearly explain why you disagree with the adjustment and provide supporting documentation. You may also request an in-person or virtual conference with an Appeals Officer. The Appeals process provides an independent review of your case by an impartial IRS officer. If you disagree with the Appeals decision, you can further pursue your case in the U.S. Tax Court, as outlined in §6213(a) of the Internal Revenue Code.