Employee vs. Employer Contributions
401(k) plans include both employee contributions (what the worker puts in from their paycheck) and employer contributions (matching or profit-sharing). In a divorce, each type of contribution may be treated differently.
Usually, the marital portion of the plan includes all contributions made during the marriage. That includes both what your spouse put in and what their employer added. But employer contributions often come with a vesting schedule, and that means your share in the divorce could depend on whether those contributions were vested at the time of separation or divorce.

