What this letter is about Contact us so we can verify your identity and process your tax return. What you need to do If you didn't file: Contact us immediately to confirm that you may be a victim of tax-related identity theft, or write to us within 15 days, include copies of the requested information and mail it to the address on the letter. If you did file, call or write to verify your identity. Call the IRS Identity Verification number on your letter. Have the following available when you call: The 5447C letter; The income tax return referenced in the letter (the Form 1040 series return). Note: A Form W-2 or Form 1099 is not a tax return. A previous year’s tax return, other than the year in the letter, if you filed one. Note: A Form W-2 or Form 1099 is not a tax return. Supporting documents that you filed with each year’s income tax return (Form W-2, Form 1099, Schedule C or F, etc.). If you prefer, you can write to us within 15 days of receiving the letter and include copies of the requested information. Mail your information to the address on your letter. Note: Although the letters request a response within 30 days, the IRS will continue to work with you regardless of the amount of days that have passed. If we don't hear from you We may not be able to process your return, issue refunds, or apply overpayments to next year’s estimated tax. The toll-free and non-toll-free numbers are for identity verification only. No other tax-related information, including refund status, is available. Frequently asked questions What if I am incarcerated? You must coordinate with your Prison Official. What happens after I call the IRS? Once we verify your identity and confirm you submitted the tax return, we’ll continue processing your return. It will take approximately nine weeks to process. Where can I find more information? You can find more information in Publication 5027, Identity Theft Information for Taxpayers. The IRS Identity Protection PIN can help prevent misuse of your taxpayer identification number on fraudulent federal income tax returns. Learn more at IRS.gov/ippin. Reference Tools Publication 1, Your Rights as a Taxpayer Publication 17, Your Federal Income Tax Full list of tax forms and instructions Need Help? See if you qualify for help from a Low Income Taxpayer Clinic. If you can’t find what you need online, call the IRS number at the top of your notice or letter.