Perhaps you are trying to describe a Qualified Joint Venture? See this IRS reference:

https://www.irs.gov/businesses/small-businesses-self-employed/election-for-married-couples-unincorpo...

But that is a mistake.

"A qualified joint venture, for purposes of this provision, includes only businesses that are owned and operated by spouses as co-owners, and not in the name of a state law entity (including a limited partnership or limited liability company)"