1. Employee vs. Employer Contributions
Typically, both employees and employers contribute to the 401(k). The QDRO can award either total account value or just the employee-contributed portion, depending on the terms of the divorce settlement.
If employer contributions are not fully vested, those funds may not be payable to the alternate payee. Your QDRO should clarify whether unvested funds are included and how to handle any future vesting.

