401(k) Adoption Date Extended for Defined Contribution Pre-approved Plans Posted on April 18, 2017April 18, 2017 by Peter Iverson, Esq. The IRS has extended the deadline from Sunday, April 30, 2017, to Monday, May 1, 2017, for certain employers to adopt defined contribution pre-approved plans and apply for a determination letter. Further details are available on the IRS website. Share this:Click to share on LinkedIn (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to email a link to a friend (Opens in new window)Click to print (Opens in new window) Related