Employee and Employer Contributions
In 401(k)-style plans like this one, both employee and employer contributions can be involved. Employee contributions are always 100% yours (assuming no loans against them), but employer contributions often follow a vesting schedule.
If part of your spouse’s account isn’t fully vested, you may only be entitled to the portion that is. That’s why it’s crucial to look at the vesting status as of the “division date” (often the date of separation or date of divorce, depending on your state’s law).

