Employee vs. Employer Contributions
Only vested employer contributions are available to divide through a QDRO. In many 401(k) plans—especially those from general business entities—the employer match or contributions are subject to a vesting schedule. If the plan participant hasn’t stayed with the company long enough, some of the employer money is non-vested and therefore not divisible.
In your QDRO, it’s important to spell out whether the alternate payee is receiving a portion of just the marital portion of the account or all vested funds in the account. For example, if there’s a 6-year vesting schedule, contributions made 3 years in might only be 50% vested and therefore subject to reduction after divorce if not handled correctly.

