- you still owe money.
- the IRS disallowed your credits.
- you have new documents.
- the IRS made an error.
If you qualify, take the following steps:
Step 1: Review your audit report using Form 4549, Report of Income Tax Examination Changes. Check what you disagree with.
Step 2: Fill out Form 12661, Disputed Issue Verification. Explain what the IRS got wrong, and attach proof or supporting documentation.
Step 3: Submit everything at IRS.gov/examreply using the Document Upload Tool. The IRS will review your case, and you’ll get a letter with a final decision.
For full details, read Publication 3598, or visit IRS.gov.