1. Employee vs. Employer Contributions
401(k) plans usually consist of both employee deferrals and employer matching contributions. In a divorce, the QDRO may allocate all contributions earned during the marriage to the alternate payee. But employer matches may follow a vesting schedule, which limits how much of the employer-funded portion is actually available to divide.
For example, if the employee spouse is only 60% vested in employer contributions at the time of divorce, only that 60% portion is considered for division. The QDRO can clearly state whether unvested amounts are excluded or held until they vest.

