In the case of Morrissey et al., Trustees v. Commissioner of Internal Revenue (1935), the U.S Supreme Court ruled on whether a trust could be considered an "association" and therefore taxed as a corporation under federal law. The trusts in question were created by two individuals who transferred their stock holdings to trustees, with instructions to manage these assets for the benefit of designated beneficiaries. The IRS argued that these arrangements constituted associations taxable as corporations because they closely resembled business organizations, given their centralized management and continuity of life features. However, the court disagreed with this interpretation. The Supreme Court held that although some trusts might have characteristics similar to those found in businesses or associations, it did not necessarily mean they should be classified and taxed as such under federal law. Instead, each trust needed to be evaluated based on its own unique attributes rather than being automatically categorized due to certain similarities with other entities. This ruling clarified how trusts would be treated for tax purposes moving forward - emphasizing individual assessment over broad categorization - which had significant implications for estate planning strategies involving trusts.

In the dissenting opinion for Morrissey et al., Trustees, v. Commissioner of Internal Revenue, Justice Stone argued that the majority's decision to treat a trust as an association and therefore subject it to corporate tax was incorrect. He contended that there were fundamental differences between trusts and corporations which made them distinct entities under law. In his view, just because a trust may have some characteristics similar to those of a corporation does not necessarily make it an association liable for taxation as such. The justice believed this interpretation expanded the definition of "association" beyond its intended scope in tax legislation and could lead to unjust results by imposing additional taxes on trusts without clear legislative authority.