The solo 401k voluntary after-tax must be applied to the specific holding account that was setup under the plan to hold the voluntary after-tax contributions before the contribution can be converted to the Roth Solo 401k or Roth IRA. This is an important compliance step as the rules don’t allow to simply contribute to the funds to the Roth Solo 401k or the Roth IRA and then count it as a mega backdoor contribution.

CLICK HERE to proceed to step 3.

CLICK HERE to review all the steps.