Employee and Employer Contributions
Both employee and employer contributions may be considered marital property, depending on when they were made. However, many employer contributions in 401(k) plans are subject to a vesting schedule.
If the employee is not fully vested, a portion of the employer contributions may be forfeited if they leave the company, meaning less will be available to divide. A proper QDRO should account for this by stating that only vested balances as of a certain date (like the date of divorce) are divisible.

