Unvested Employer Contributions
Most 401(k) plans include a vesting schedule for employer contributions. A participant may only be partially vested at the time of the divorce, which means that part of their employer match could be forfeited if they leave the company before reaching full vesting.
Your QDRO should clearly separate vested amounts (which can be divided) from unvested portions (which typically cannot). If the participant later vests post-divorce, the QDRO can account for those gains if worded correctly.

