1. Employee vs. Employer Contributions
401(k) accounts often have both types:
- Employee contributions: Typically 100% vested immediately and subject to division based on dates of marriage and separation.
- Employer contributions: Often subject to a vesting schedule. The non-employee spouse cannot claim unvested amounts at the time of division unless the employee later vests and the QDRO specifies future entitlements.
This is where mistakes happen. If the QDRO just says “50% of the account,” but doesn’t clarify vesting, the alternate payee can be shortchanged.

