IRS form LTR 147C shows the registered legal name, "doing business as" name, address and Employer ID Number of a business entity. These forms are often used for verification of EINs and legal business names in connection with a Tax Identification Number.
Form LTR 147C has become more common since 2013 due to new IRS regulations requiring that businesses match their EINs to their TINs and their legal business names. Multiple TINs and business names had previously been used for tax fraud. These forms may be requested from business owners by banks or credit card processing agencies. People can obtain form LTR 147C by calling the IRS during normal business hours.