No Deductions for Marijuana Businesses Act

This bill prohibits marijuana businesses from deducting ordinary business expenses on their federal tax returns. It amends federal tax law to deny deductions or credits for any costs related to selling marijuana (which remains illegal under federal law), directly affecting state-legal marijuana businesses operating under state law but subject to federal prohibition. The key provision requires these businesses to pay taxes on their full gross income without subtracting standard business costs like rent or supplies. The rule applies to tax years beginning after the bill's enactment date.