The IRS 5071C letter is a letter sent to taxpayers by the IRS to verify a taxpayer's identity after the IRS received a tax return with the taxpayer's name and Social Security number. The letter is used to help identify potential identity theft.
If a taxpayer receives a 5071C letter, he is provided with two options on how to respond, and both options allow the taxpayer to securely verify his identity with the IRS so the IRS can continue to process the tax return. The contact information included in the letter is only for taxpayers who receive the 5071C letter, and the toll-free number and website address provided are for verification purposes only. No other tax-related information, including the status of a refund, is available throughout the verification process.