Employee vs. Employer Contributions
401(k) accounts are typically made up of employee salary deferrals and employer contributions (such as matching). In your QDRO, you’ll need to specify if both types of contributions are being divided, or only the vested portion of employer contributions as of a certain date.
Many employer contributions in 401(k) plans require a vesting schedule. If the participant isn’t fully vested at the date of divorce, some of their employer-funded benefits may not be eligible for division.

