Employee and Employer Contributions
Typically, both the employee and employer contribute to the 401(k) over time. If you’re the alternate payee (the spouse receiving benefits), you’re generally entitled to a portion of the marital share—which usually includes all contributions made during the marriage.
However, employer contributions may be subject to a vesting schedule. That means even if those dollars were added during the marriage, they might not be fully vested, and therefore not all of it is legally transferable.

