Employer vs. Employee Contributions
Employee contributions are always 100% vested. That means they can be divided at any time, regardless of when the participant leaves the job. But employer contributions may follow a vesting schedule.
If the participant isn’t fully vested, the non-vested portion can’t be divided and may be forfeited. That’s why the QDRO should be careful to only assign a portion of the “vested account balance.” Otherwise, the alternate payee might receive less than expected later on.

