After nearly a decade of litigation, the U.S. Tax Court delivered its final verdict in 2018 – Harborside, a medical dispensary, would have to pay $11 million in back taxes for improperly claiming business deductions between 2007 and 2012. The court ruled that because Harborside’s primary activity was dealing in cannabis, a Schedule I substance, Section 280E of the tax code disallowed nearly every deduction, leaving them with only the literal Cost of Goods Sold (COGS) to offset their income.
The fact that a single cannabis tax decision nearly bankrupted one of the nation's most successful dispensaries is a good reminder that dispensary owners must take cannabis tax laws very seriously.
This guide provides a complete overview of the complex tax landscape, focused on dispensary operators – breaking down why cannabis taxation remains structurally different from traditional retail, how Section 280E impacts your bottom line, and the tax planning you need to do to keep records audit-ready.
Disclaimer: This page is meant to educate readers and spread awareness only – it has been fact-checked and is current as of January 27, 2026. It is not intended to be, nor should be considered legal advice. Given the evolving nature of cannabis tax, legal advice of any nature should be sought from legal counsel.

