Employee Contributions vs. Employer Contributions
The participant’s own salary deferrals are usually 100% theirs—these funds are always considered “vested.” However, employer contributions might be subject to a vesting schedule. In many cases, an ex-spouse can only be awarded what’s vested as of the divorce cut-off date (typically the date of separation or final decree).
If your QDRO overstates the alternate payee’s share by including unvested funds, the plan will reject it or simply reduce the payout. That’s why accurate calculation and careful drafting are essential from the start.

