Tax Legal Services · Primary-source case analysis

Sullivan: How a Federal Wagering-Tax Rule Undercut Blanket Deduction Disallowance

By Aneeta Mishra and Timothy Chan

Published August 16, 2026 · Updated October 18, 2026

Decision: Comm’r v. Sullivan, 356 U.S. 27 (1958).

The most revealing step in Commissioner v. Sullivan, 356 U.S. 27 (1958), is the Court’s use of a federal wagering-tax regulation. The taxpayers’ Chicago bookmaking businesses violated state law, but the federal tax rules treated a tax paid on wagering as a business expense. That existing federal treatment helped the Court reject an across-the-board denial of the rent and wage deductions before it. The reasoning was about the federal policy actually expressed—not judicial approval of gambling.

The rent and wage payments themselves violated state law

The Tax Court had found more than an illegal business in the background. It found the employees’ acts unlawful under Illinois law and the payment of rent for bookmaking premises unlawful as well. It therefore denied the deductions because the expenditures related to illegal acts. The Supreme Court did not overlook those findings when it affirmed the appellate judgments allowing the deductions. A summary saying only that the payments were ordinary business costs misses the precise objection the Court rejected. Sullivan, 356 U.S. at 27–28.

The federal wager-tax rule pointed against blanket disallowance

The opinion noted that the applicable Treasury regulation and revenue ruling permitted deduction of the federal excise tax on wagers as an ordinary business expense. The Court treated that rule as recognition of gambling as a business for federal tax purposes and as inconsistent with the blanket disapproval urged for rent and wages. The point is historical and specific: The opinion quoted the then-applicable regulation, not a current assurance that every wagering payment is deductible. Read the federal provision actually governing the payment rather than infer a universal tax result from state-law illegality. Sullivan, 356 U.S. at 28–29 and footnote 3.

The Court left a broader gross-receipts choice to Congress

Disallowing these normal operating costs while taxing the receipts would move this business toward taxation on gross receipts rather than net income. The Court said Congress should make that choice if it wanted to. It did not say Congress lacked power to impose such restrictions; the opinion began by recognizing Congress’s authority to disallow deductions. This distinction matters whenever someone treats a judicial decision allowing a historical deduction as a permanent exemption from later legislation. Sullivan, 356 U.S. at 28–29.

The opinion preserved limits for different kinds of payments

The opinion expressly preserved a different result where a deduction would avoid the consequences of a legal violation or contravene federal policy stated in a statute or regulation. It referred to the companion motor-carrier fine cases rather than deciding that all unlawful-business payments receive identical treatment. The Court affirmed the rent and wage deductions under the law before it. A current deduction still requires checking the applicable statutory restrictions and facts; this three-page opinion alone is not an answer for fines, bribes, controlled substances, or every other expense. Sullivan, 356 U.S. at 29.

Key takeaways

• Identify the federal rule governing the particular payment, not just the legality of the business.
• Distinguish the historical wagering-tax regulation from a current deduction entitlement.
• Do not turn Congress’s ability to restrict deductions into a claim that it has not done so.
• Read the opinion’s preserved limits before applying its rent-and-wage result to another payment.