The IRS conducts audits to verify income, deductions, expenses, and credits claimed on tax returns. Here’s what to do if you receive a letter that says the IRS is auditing your tax return by mail.

First, read the letter carefully. It explains the issues involved and outlines the types of information you need to send us. We’ll ask for documents to support information on your tax return. If you’re not able to verify something, you’ll need to explain how you determined the amount you reported. There are different ways you can submit the information to the IRS. Regardless of how you submit it, you should always include the reply coversheet with the documents you send. Here are the options for submitting information to the IRS:

  1. The Document Upload Tool – This is a secure and convenient way to upload your correspondence. The notice will tell you how to share your documents with the IRS online.
  2. Fax – If you prefer to fax, use the number provided in the letter you received.
  3. Postal Mail – If you mail your information, use the envelope provided. If your information doesn’t fit, you can use your own envelope. Do not mail original documents when you submit your information. No matter how you submit your information, remember to keep copies of everything you send the IRS.
  4. Some letters may include an invitation to use the taxpayer digital communication option.

Be sure to send the documents to the IRS by the deadline given, or ask for an extension. If the IRS determines the documents you sent are sufficient, they’ll close out your case and send you a letter letting you know there’s nothing else to do. If they determine that the documentation is insufficient, they’ll send you a letter to let you know what information they still need to resolve your case. If you agree with the proposed changes, follow the instructions to have your case closed. If you disagree with the proposed changes, send the IRS an explanation with your supporting documents. Remember, you have the right to request an appeal review with the IRS. If you disagree with the proposed changes, and don’t request an appeal review, you’ll receive a certified statutory notice of deficiency. You can continue to work with the IRS by providing the requested information to resolve your examination, or you can follow the instructions in the letter to petition tax court.

For more information about audits, go to IRS.gov/audit. You can also refer to Publication 3498-A, included with your letter.