BTG Posted July 6, 2021 Report Share Posted July 6, 2021 My understanding is that the deadline for a participant to elect voluntary after-tax contributions is the due date for the employer's tax return (as opposed to traditional or Roth elective deferrals, which must still be elected by December 31 (even though they can be funded later). Can anyone point me to authority either supporting or correcting that understanding? (Note: I'm specifically asking in the context of a solo 401(k) plan for a sole proprietor.) Thanks! Link to comment Share on other sites More sharing options...
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