The spouse seeking a green card needs to show evidence of assets, but the requirements differ depending on whether they are applying from within or outside the United States. Check out this detailed guide about the types of assets an applicant can include and acceptable documents to show proof of those assets.
When completing the financial support form (Form I-864), the sponsoring spouse (and joint sponsor, if any) needs to show proof of assets if they are counting assets to meet the minimum income requirements of a marriage-based green card. Learn more here about acceptable documents to show proof of assets when applying for a marriage green card.