Employee vs. Employer Contributions
The employee’s own contributions to the 401(k) are always considered marital property (to the extent they were made during the marriage). The employer contributions, however, are often subject to a vesting schedule. That means the participant may forfeit part of the employer match if they leave the company before a certain number of years—usually between three and six years for most general business plans.
A proper QDRO will clarify how both types of contributions should be divided and address what happens to unvested amounts. Often, only the vested balance as of the date of divorce is divided—unless otherwise agreed in your divorce judgment.

