Employee vs. Employer Contributions
Many 401(k) plans include both employee contributions (deducted directly from the paycheck) and employer matching contributions. Only the employee contributions are always immediately vested. Employer contributions often have a vesting schedule. That means if your QDRO tries to award half the account and includes amounts that aren’t vested yet, the alternate payee may receive less than expected.
Always ask the plan administrator for a statement that shows vested vs. unvested balances as of the division date. That way, your QDRO only covers what is legally available for division.

