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After-tax contribution deadline


BTG
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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!

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After I posted this, it occurred to me that the real issue in this situation is probably the 415 rules.  Per Treas. Reg. § 1.415(c)-1(b)(6)(C), an employee contribution must be made no later than 30 days following the close of a limitation year in order to be treated as an annual addition for that limitation year.  So, I think that is really the outside limit (not the tax return deadline).

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