1. Contribution Types: Employee vs. Employer Contributions
There are often two components to a 401(k): the employee’s own salary deferrals (which are always 100% vested) and the employer’s matching or discretionary contributions. Some employer contributions may be subject to a vesting schedule.
If you’re trying to divide this account, unvested employer contributions can’t be awarded unless they later vest—and even then, the QDRO must clearly address how those are handled.

