[Official Guidance]

Text of IRS Notice 2012-64—Update for Weighted Average Interest Rates, Yield Curves, and Segment Rates (PDF)
"This notice provides guidance as to the corporate bond weighted average interest rate and the permissible range of interest rates specified under Section 412(b)(5)(B)(ii)(II) of the Internal Revenue Code as in effect for plan years beginning before 2008. It also provides guidance on the corporate bond monthly yield curve (and the corresponding spot segment rates), and the 24-month average segment rates under Section 430(h)(2). In addition, this notice provides guidance as to the interest rate on 30-year Treasury securities under Section 417(e)(3)(A)(ii)(II) as in effect for plan years beginning before 2008, the 30-year Treasury weighted average rate under Section 431(c)(6)(E)(ii)(I), and the minimum present value segment rates under Section 417(e)(3)(D) as in effect for plan years beginning after 2007. These rates reflect certain changes implemented by the Moving Ahead for Progress in the 21st Century Act, Public Law 112-141 (MAP-21). MAP-21 provides that for purposes of Section 430(h)(2), the segment rates are limited by the applicable maximum percentage or the applicable minimum percentage based on the average of segment rates over a 25 year period." (Internal Revenue Service)