Employee Contributions vs. Employer Contributions
Most 401(k) accounts consist of money contributed by the employee and, in some cases, matching or profit-sharing money contributed by the employer. The portion you’re entitled to may depend on whether you’re dividing just what was earned during the marriage, or the entire account as of the division date.
Employer contributions are often subject to a vesting schedule. Any unvested amounts may not be legally awarded in a QDRO. Be sure to find out if any portion of the account is not yet vested, especially if the divorce occurred before full vesting took place.

