On March 20, 2017, the Internal Revenue Service (IRS) issued Revenue Procedure 2017-28, which provides guidance to employers on obtaining employee consents used to support a claim for credit or refund of overpaid taxes under the Federal Insurance Contributions Act (FICA) and the Railroad Retirement Tax Act (RRTA). This OTS describes the new procedures and provides valuable information regarding the rules for amending past employment tax returns due to the over- or under-payment of Social Security, Medicare and Federal income tax on employee wages.