No, traditional IRA funds, whether pre tax or non-deductible IRA funds are not allowed to be transferred to the voluntary after-tax solo 401k as the IRA rules do not allow for it. However, a traditional IRA solely consisting of pretax IRA funds may be converted to the Roth Solo 401k which would entail working with your current IRA custodian in processing the taxable conversion of the pretax IRA funds to the Roth solo 401k where they would make a check payable in the name of the Roth solo 401k which they would then mail to you for deposit into the solo 401k plan. The IRA custodian would not perform any tax withholding on the pretax IRA conversion to the Roth solo 401k but you would have to pay the federal taxes due on the conversion by your personal tax return due date. Also, the pretax IRA custodian will then issue a Form 1099-R by January of the following year in which the conversion transpired with a copy sent to you and a copy filed by the IRA custodian with the IRS.
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