Employee vs. Employer Contributions
Most 401(k) plans include two types of contributions: those made by the employee (fully vested immediately) and those contributed by the employer, which may be subject to a vesting schedule. If the employee hasn’t completed a specific number of years of service, some of the employer money may be forfeited and not available for division in the QDRO. A well-drafted QDRO should address this explicitly.

