Hi, I'm Cherise, and I work for the Internal Revenue Service. When our records don't match what you reported on your tax return, we'll send you a letter proposing changes. Usually, this is called a CP mm notice. This doesn't mean you're being audited, but there's a discrepancy with your return that needs to be resolved. So, what should you do if you receive a CP mm? Read the notice carefully. Review the proposed changes and compare them to your tax return. If you agree, check the "sign" and "date" the response form, and return it by the due date. You can fax it to the number mentioned in the notice or mail it using the enclosed envelope. If you don't agree with some or all of the proposed changes, it's still important that you respond by the due date. Check the "I do not agree" section of the response form, and send a signed statement telling us why you don't agree. Include photocopies of any supporting documentation within a response form and send that documentation to us in an enclosed envelope. Don't send the original documents. If you need to use a larger envelope, send it to the address on the first page of the notice. If you fax the information, include your name, social security number, and tax year on each page. Don't file an amended return for the tax year shown on the notice. Once we receive your response, we will make the corrections for you if we agree. However, if you made the same type of error in any other tax years, consider filing amended returns for those years. Be sure to send your reply and supporting documentation to us within 30 days of the letter's date. If you can't meet the deadline, call the number on the notice...