Employee vs. Employer Contributions
In most 401(k) plans, contributions come from both the employee and the employer. The employee’s contributions are usually fully vested right away. However, employer contributions (such as matching or profit-sharing amounts) may be subject to a vesting schedule.
If your QDRO is splitting the account at the time of divorce, it must account for which employer contributions are actually vested. The alternate payee (often the non-employee spouse) may not be entitled to unvested amounts, and the QDRO must reflect that up front.

