What to do when a community property state spouse will not provide documents for income tax preparation

I am in Wisconsin, and have had several clients in your situation, and I just don't fill out the 8958. I make a note in my clients file that spouse would not provide information. Never had an issue in over 30 years. Don't know if IRS would agree

Im with Terry on this, you cant force anyone to give you info., I just check the NO box at the top of the 8958 and use my clients info only.

It sounds like the spouse is treating it as non-community property.

https://www.irs.gov/publications/p555#en_US_202001_publink1000168799

All I know is what I learn from the Internet.

"California uses the date of separation as the essential date for determining property interests; property acquired by a spouse after the date of separation is considered to be that spouse’s separate property, while property acquired before the date of separation is community property."

 https://cadivorce.com/california-divorce-guide/what-to-expect/significance-of-the-date-of-separation/ 

We don't have that issue in Taxsylvania, so I don't know much about it. What I do know is that when a couple is going through a divorce or a separation people get spiteful sometimes. That is why I usually tell both of them to go take a hike. I don't have time for Chuck E Cheese games.