Employee vs. Employer Contributions
Most 401(k) plans include both employee (participant) contributions and employer matching or discretionary contributions. These employer contributions can come with vesting schedules. That means a portion of the account may be unvested, and the alternate payee (usually the non-participant spouse) may not be entitled to receive a share of those unvested amounts.
It’s essential to specify in the QDRO whether only vested amounts will be divided, or whether a portion of unvested contributions will be subject to later allocation. If this is not clearly addressed, the plan administrator may reject the order or apply different rules than intended.

