Vesting Schedules and Forfeiture Rules
Many 401(k) plans have employer contributions that vest over time. Contributions made by the employee are always 100% vested, but the company match (if any) might not be. If your spouse isn’t fully vested, only the vested portion can be awarded by QDRO. The rest is forfeited. Determining this requires checking the plan’s vesting schedule, which must be requested from the plan administrator.

