Dividing Employee and Employer Contributions
Employee contributions are immediately vested and straightforward to split. Employer contributions, however, may be subject to a vesting schedule. If your spouse is not 100% vested in the employer contributions, the amount awarded to you may be reduced—or require tracking until vesting is complete.
Most QDROs for plans like this will specify how to divide the balance: usually by percentage (e.g., 50%) as of a certain “valuation date” (like the date of separation or divorce). You’ll need to decide with your attorney what that date should be, as it can significantly impact the division amount.

