Vested vs. Unvested Contributions
Many 401(k) plans have a vesting schedule for employer contributions. If your spouse receives company matching or profit-sharing payments, he or she may not be fully vested in those employer contributions. The QDRO should clarify what happens to unvested amounts — are they excluded or do you split only vested contributions?
We always recommend listing only vested balances as divisible unless otherwise negotiated. This avoids confusion or disputes if amounts are later forfeited due to termination or other changes.

