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@chapguy19 wrote:

He wants me to file his MFS tax return which of course is wrong. 

What's wrong?  He prepared it and he just wants you to file it that way?  

Google AI, which may be incorrect, tells us "In Washington State, community property ends on the date of separation, the date when the marital community stops accumulating property. Property acquired before this date is community property, while property acquired afterward is separate property."

 

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