The IRS issued Revenue Procedure 2010-52, which describes how a multiemployer plan sponsor can request an extension under Code section 431(d) of its planʼs unfunded liability amortization period. The guidance describes the information a plan sponsor must include in both automatic and alternate extension applications. Applicants must now also notify the PBGC. The IRS issued a Model Notice of Application for Amortization Extension and extended the time plan sponsors have to submit an application to the 15th day of the third calendar month following the last day of the first plan year for which the extension is intended to take effect.