In the case of United States v. Reynolds et ux., the Supreme Court was tasked with determining whether a taxpayer could deduct expenses related to maintaining an office in their home, even if it wasn't their primary place of business. The respondent, Dr. Reynolds, maintained two offices - one at his hospital and another in his home where he spent approximately 30-35 hours per week conducting research and administrative tasks for his medical practice. He claimed deductions on his income tax returns for costs associated with this home office including utilities, repairs, insurance and depreciation. The Internal Revenue Service (IRS) disallowed these deductions arguing that they were not "ordinary and necessary" business expenses as required by section 162(a) of the Internal Revenue Code because Dr. Reynolds' principal place of business was at the hospital. However, upon reaching the Supreme Court after being heard in lower courts first favoring IRS then later favoring Dr.Reynolds on appeal; it ruled against IRS's interpretation stating that there is no requirement under section 162(a) that expenditures be incurred at taxpayer’s “principal” place of business to qualify as deductible trade or business expense.

In the dissenting opinion for United States v. Reynolds et ux., Justice Douglas argued that the majority's decision was an overreach of federal power and a violation of states' rights. He contended that Congress did not have the authority to regulate local, non-commercial activities such as personal loans between family members, which were at issue in this case. According to him, allowing Congress to regulate these types of transactions would open up virtually every aspect of life to potential federal oversight and control. Furthermore, he expressed concern about the implications for individual privacy rights if such broad regulatory powers were granted to the government. In his view, it was essential for courts to maintain strict boundaries on congressional power in order protect fundamental constitutional principles like state sovereignty and individual liberty.