Division of Employee vs. Employer Contributions
401(k) plans often include both employee contributions (amounts an employee elects to defer from their paycheck) and employer contributions (matching or discretionary amounts). In many divorces, both types of contributions are divided equally between the participant and the alternate payee.
However, employer contributions may be subject to a vesting schedule. If those amounts aren’t fully vested on the date used for division (called the “valuation date”), then the alternate payee might not be entitled to them. It’s critical your QDRO specifies how to handle unvested dollars—should they be excluded? Or should they transfer once they vest?

