1. Employee vs. Employer Contributions
When splitting a 401(k), you must consider both what the employee (the plan participant) contributed and what the employer contributed. The employee’s contributions are always considered 100% vested and can be assigned to the alternate payee (the ex-spouse) under a QDRO.
However, employer contributions often come with a vesting schedule. If the marriage ends before the participant is fully vested, the alternate payee may only be entitled to a portion—or none—of those employer contributions.

