Employee vs. Employer Contributions
When dividing a 401(k), it’s important to know that the account contains both employee and employer contributions. A common mistake is assuming the entire account is all one lump sum. In fact, employer contributions may be subject to vesting.
For example, if the participant is not fully vested, some of the employer-funded portion might not yet belong to them—and can’t be divided. Your QDRO should clarify whether the alternate payee will share only in the vested portion or also in any future vesting of unvested funds from the marriage period.

