You will work with your bank in electronically moving/converting the funds from the Voluntary after-tax solo 401k bank account to the Roth solo 401k bank account.

One Participant: If there is just one participant in the solo 401k plan, you should have opened at minimum 2 (two bank accounts)—a Roth solo 401k bank account and a voluntary after-tax solo 401k bank account– for the solo 401k. 

Two Participants: If both participants (e.g., both spouses) are participating in the solo 401k and plan to make voluntary after-tax contributions and then convert then to covert them to the Roth solo 401k, then at minimum 4 (four) bank accounts are required.

Brokerage Account: CLICK HERE if converting from the solo 401k brokerage account.

CLICK HERE to proceed to step 4.

CLICK HERE to review all the steps.