Employee vs. Employer Contributions
In a 401(k) like the Olson & Co.. Steel 401(k) Plan, there are usually two sources of money: the employee’s contributions and the employer’s match. Only the employee’s contributions are fully vested by default. Employer contributions may be subject to a vesting schedule, which determines how much the employee “owns” at the time of division.
In your QDRO, it’s important to specify whether the former spouse’s share includes just the vested portion or all contributions made during marriage (with unvested amounts forfeiting later, if applicable).

