Employee vs. Employer Contributions
A 401(k) plan often includes contributions from both the employee and the employer. In a QDRO, only the marital portion—typically what was earned or accrued during the marriage—gets divided. However, employer contributions may be subject to a vesting schedule. If some of the employer contributions aren’t vested at the time of divorce, they may not be divisible.
This matters because an alternate payee (usually the non-employee spouse) may not receive unvested portions. Once the participant meets vesting thresholds after divorce, unvested employer funds will remain with the participant unless the QDRO specifically provides for future vesting language.

