1. Employer Contributions and Vesting Schedules
Most 401(k) plans include both employee contributions—usually fully vested—and employer contributions that may be subject to a vesting schedule. For example, the employer might require six years of employment for full vesting. Any unvested portion isn’t usually transferable to the alternate payee. Your QDRO must be clear whether it awards 50% of the total account or just the vested portion as of a specific date.

