Employee and Employer Contributions
In most 401(k) plans like the Industrial Lighting Products Retirement Savings Plan, employees make contributions directly from their paycheck. Employers may also make matching contributions, subject to a vesting schedule. A QDRO can divide both types of contributions.
The divorce judgment often determines what portion of the account is divided: commonly 50% of the marital portion (usually calculated from the date of marriage to the date of separation or divorce). The QDRO will then instruct the plan how to split the employee and employer contributions accordingly.

