Employee and Employer Contributions
Employee contributions (what the participant personally contributed) are fully vested and easily divided. However, employer contributions are usually subject to a vesting schedule. If the participant isn’t fully vested at the time of divorce, the non-employee spouse may not be entitled to the entire employer-match portion.
When dividing this plan, be sure the QDRO addresses whether you’re dividing based on the account balance as of the division date or at the time of distribution. Also, some plans allow post-divorce earnings and losses to be applied to the alternate payee’s share; others require specificity in the order to apply them.

