Vesting Schedules and Employer Contributions
Many employer-sponsored 401(k) plans include both employee and employer contributions. While employee contributions are 100% vested immediately, employer contributions often follow a vesting schedule.
If your spouse hasn’t met the vesting requirements at the time of divorce, a portion of the account may be forfeited. The QDRO should clearly specify whether it divides only vested amounts or includes a provision for future vesting post-divorce (we usually don’t recommend the latter).

