Employee vs. Employer Contributions
Employee contributions to a 401(k) are generally fully vested right away. That means if your spouse contributed through payroll deduction, that portion is almost always divisible under a QDRO. However, employer contributions may be subject to a vesting schedule. If your spouse isn’t fully vested, some of the plan balance may not be available for division.
Make sure the QDRO clearly specifies whether it divides just the vested balance at the time of divorce or includes any future vesting. This is a key detail that can avoid disputes later.

