Employee vs. Employer Contributions
Employee contributions to a 401(k) plan are usually fully vested immediately, and therefore subject to division in a QDRO based on the marital period. Employer matching or profit-sharing contributions, however, are often subject to a vesting schedule.
If the participant spouse hasn’t met the vesting criteria at the time of divorce (or plan division), a portion of the employer contributions may be forfeited—and thus unavailable for division.

