Employee vs. Employer Contributions
Most 401(k) plans include employee contributions (money the participant put in) and employer contributions (money from the plan sponsor—which in this case is Unknown sponsor). Only the vested portion of employer contributions can be divided through a QDRO. Dividing unvested contributions exposes the alternate payee to losing benefits if the participant separates from employment before becoming fully vested.
We often draft QDROs that say the alternate payee is awarded a portion of the participant’s “vested account balance as of the date of divorce,” which helps avoid surprises later when unvested funds disappear.

