The United States Supreme Court case of the United States v. Minnesota Mutual Investment Company in 1925 revolved around a dispute over taxation. The Minnesota Mutual Investment Company had purchased land from an Indian tribe, which was held in trust by the federal government. The company then leased this land to non-Indians and collected rent on it. However, they refused to pay taxes on this income, arguing that as the property was technically still owned by Indians (with ownership merely being administered by the government), it should be exempt from taxation under existing treaties with Native American tribes. The U.S Government disagreed and sued for back taxes owed. Upon reaching the Supreme Court, it ruled against Minnesota Mutual Investment Company stating that while lands held in trust for Indians were indeed tax-exempt when used or occupied by them directly; however, once these lands are rented out to non-Indians - even if indirectly through a third party like MMIC - they lose their tax-exempt status because such use does not fall within treaty protections meant for tribal self-sufficiency and preservation.

The dissenting opinion in the case of United States v. Minnesota Mutual Investment Company argued that the majority's decision was incorrect because it failed to properly interpret and apply tax law. The dissent believed that the company should not be taxed on its income from real estate sales, as these were capital gains rather than ordinary income. They contended that this interpretation was consistent with both the intent and letter of relevant tax legislation, which aimed to encourage investment in real estate by providing favorable tax treatment for such investments. Furthermore, they suggested that taxing these gains as ordinary income would discourage companies like Minnesota Mutual from investing in real estate, thereby undermining one of the key policy goals behind these laws. Therefore, they concluded that the majority's ruling represented a misinterpretation of tax law and an unjust imposition on businesses engaged in real estate investment.