IRS Notices—Complete Guide and Resources

IRS notices are official written communications from the Internal Revenue Service about your tax account. You may receive a notice or letter when the IRS determines there are changes to your tax return, questions about your filing, or when you owe a tax bill. Unlike emails or calls, a legitimate IRS notice always arrives by U.S. mail at your address of record.

Most notices include instructions on how to respond, the deadline for action, and IRS contact details. Taxpayers should carefully review the information, gather their records, and follow the instructions to ensure compliance. Common notices address issues such as balance due, refund delays, penalties and interest, or requests for supporting documents. You can often apply for a payment plan or installment agreement (IA) to manage your tax debt and avoid default.

If you cannot pay the amount you owe in full, the IRS provides options such as short-term plans or long-term agreements that may include fees but help prevent enforcement actions against your assets. Always contact the IRS if you receive a letter, request relief, or need to explore eligibility. Acting within the required time gives you the best chance to meet IRS requirements, protect your financial status, and find approved solutions for your current situation.

The CP2000 is the most frequently issued IRS notice, sent when information reported by third parties (employers, banks, etc.) doesn't match what you reported on your tax return. This notice proposes changes to your tax return and may result in additional taxes owed. You have 30 days to respond with documentation supporting your original filing or to agree with the proposed changes.