Employee and Employer Contributions
The participant’s 401(k) likely includes both employee contributions (100% vested immediately) and employer contributions, which may be subject to a vesting schedule. In most cases, only vested employer contributions can be divided in a QDRO. Any unvested portion typically stays with the participant.
In your QDRO, it’s important to be clear whether you’re dividing just the marital portion, and if so, until what date. Many QDROs use a “time rule formula,” which prorates the account based on the length of the marriage compared to total service.

