Interest rates: underpayments and overpayments. The rates for interest determined under Section 6621 of the code for the calendar quarter beginning January 1, 2018, will be 4 percent of overpayments (3 percent in the case of a corporation), 4 percent for underpayments, and 6 percent for large corporate underpayments. The rate of interest paid on the portion of a corporate overpayment exceeding $10,000 will be 1.5 percent.

This notice contains the 2017 Required Amendments List for individually designed qualified retirement plans. The list identifies certain changes in qualification requirements that became effective in 2017 that may require a retirement plan to be amended in order to remain qualified, and establishes the date by which any necessary amendment must be made.

This notice sets forth updates on the corporate bond monthly yield curve, the corresponding spot segment rates for December 2017 used under § 417(e)(3)(D), the 24-month average segment rates applicable for December 2017, and the 30-year Treasury rates. These rates reflect the application of § 430(h)(2)(C)(iv), which was added by the Moving Ahead for Progress in the 21st Century Act, Public Law 112–141 (MAP-21) and amended by section 2003 of the Highway and Transportation Funding Act of 2014 (HATFA).

This notice provides guidance on the application of sections 409A and 457A. Specifically, this guidance addresses the transition provisions enacted as part of section 457A that generally provide that amounts deferred and attributable to services performed before January 1, 2009, that would otherwise have been subject to inclusion in income under section 457A, are includible in gross income in the later of the last taxable year beginning before 2018 or the date of vesting. As amounts have become includible in income during 2017, stakeholders have raised questions concerning the ability to make distributions to pay the income taxes due on these amounts and still maintain compliance with section 409A. This notice provides that service recipients may accelerate distributions to pay income taxes on amounts includible in 2017 without violating section 409A. This notice supplements the guidance provided in Notice 2009–8, 2009–4 IRB 347 (January 26, 2009), and is not intended to supersede or modify any of the guidance provided in Notice 2009–8.