[Official Guidance]

Text of IRS Rev. Proc. 2013-12: Update and Restatement of the Employee Plans Compliance Resolution System (PDF)
"This revenue procedure updates the comprehensive system of correction programs for sponsors of retirement plans that are intended to satisfy the requirements of Section 401(a), 403(a), 403(b), 408(k), or 408(p) of the Internal Revenue Code ... but that have not met these requirements for a period of time. This system, the Employee Plans Compliance Resolution System ('EPCRS'), permits Plan Sponsors to correct these failures and thereby continue to provide their employees with retirement benefits on a tax-favored basis. The components of EPCRS are the Self-Correction Program ('SCP'), the Voluntary Correction Program ('VCP'), and the Audit Closing Agreement Program ('Audit CAP').... This revenue procedure modifies and supersedes Rev. Proc. 2008-50, 2008-2 C.B. 464, the prior consolidated statement of the correction programs under EPCRS." [Revenue Procedure 2013-12 will be published in Internal Revenue Bulletin 2012-4 on January 22, 2013.] (Internal Revenue Service)