Employee vs. Employer Contributions
The first step is identifying what portion of the 401(k) belongs to each spouse. Generally, only the portion earned during the marriage (from date of marriage to date of separation or other agreed date) is marital property.
The employee’s contributions are relatively straightforward. However, employer profit-sharing or matching contributions might be subject to a vesting schedule. If an employee is not fully vested, unvested portions may not be available for division.
The QDRO should clearly outline whether the alternate payee receives a portion of the total account or just the vested portion—and what happens if the vesting percentage changes later due to continued service or termination.

