In the case of Helvering v. Bankline Oil Co., the U.S. Supreme Court ruled on a tax dispute between the Commissioner of Internal Revenue and Bankline Oil Company in 1937. The issue at hand was whether or not certain payments made by an oil company to its shareholders, who were also lessors under oil leases, could be considered deductible business expenses for federal income tax purposes. The court held that these payments did not qualify as ordinary and necessary business expenses because they were essentially dividends distributed among stockholders rather than lease rentals paid for property use. Therefore, such payments couldn't be deducted from gross income when calculating taxable net income according to Section 23(a) of the Revenue Act of 1928 (now codified in section 162(a) of Title 26). This ruling clarified how corporations should treat similar transactions for taxation purposes.

In the dissenting opinion for Helvering v. Bankline Oil Co., Justice Cardozo disagreed with the majority's interpretation of tax law, arguing that it was not in line with legislative intent. He believed that Congress intended to allow businesses to deduct losses from their gross income only when those losses were directly related to business operations and not due to changes in market value. In this case, he argued, Bankline Oil Co.'s loss resulted from a decrease in oil prices rather than any operational failure or expense on its part; therefore, it should not be deductible under existing tax laws. Furthermore, he contended that allowing such deductions would lead to inconsistencies and inequalities among taxpayers because fluctuations in market values are common occurrences affecting many types of property and assets beyond just oil reserves.