Vesting Rules on Employer Contributions
One critical detail in 401(k) plans is vesting. Employees are always 100% vested in their own salary deferrals, but employer contributions like a match or profit-sharing typically vest over time. If your spouse isn’t fully vested, a portion of the employer-funded balance may be unavailable for division, or may be forfeited if they leave the company prematurely.
A good QDRO ensures that only vested balances get divided and defines what happens to non-vested shares if they become vested later—or remain unvested.

