The answer assumes due to the qualified domestic relations order (QDRO), a distribution was received by one or both of the spouses. Until a distribution is taken and must be reported on the tax return there is nothing to do on the tax return.
However, you want to track the amount of your cost in the plan as a participant. Likewise you must track the amount that is awarded to your ex spouse as being their cost in the plan (investment in the contract) based on the divorce agreement. As noted: The numerator of the fraction is the present value of the benefits payable to the spouse or former spouse. The denominator is the present value of all benefits payable to the participant (you). The difference would be your cost in the plan for the time you take distribution.
You would need an OPM CSA-1099R to enter the distribution and your cost in the plan if you actually had a distribution yourself. The plan administrator would be required to make distribution based on the divorce decree and would likely be submitted to them by your attorney.
@Rehmma12
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