Employee vs. Employer Contributions
401(k) accounts usually include both employee deferrals and employer matching contributions. In divorce, only the portion earned during the marriage (typically from the date of marriage to the date of separation) is considered community or marital property.
With employer contributions, things get a little trickier. These amounts are often subject to a vesting schedule, and the QDRO should specify whether the alternate payee is entitled to the vested balance only—or a percentage of the full employer contributions (including any unvested amounts that later vest).

