Section 280E of the federal tax code bars any business that “traffics” in a Schedule I or II controlled substance from deducting ordinary business expenses or claiming tax credits, which is why state-legal cannabis businesses have paid federal income tax on gross profit rather than net income. Since an April 2026 federal order moved marijuana held under a state medical marijuana license to Schedule III, licensed medical operators fall outside 280E for that activity. Adult-use (recreational) cultivators, processors and stores remain Schedule I businesses and are still fully covered.
The Weed Street Journal first covered 280E in the early 2010s, when the U.S. Tax Court ruled against a San Francisco dispensary called the Vapor Room. More than a decade later, 280E is still the biggest tax problem in legal cannabis, though the rules finally started to change in 2026. This guide explains what the law says, who it affects, how courts have applied it and what rescheduling does and doesn’t fix. It is general information, not tax or legal advice.
What Is Section 280E?
26 U.S.C. § 280E says that no deduction or credit is allowed for amounts paid or incurred in carrying on a trade or business that consists of trafficking in controlled substances listed in Schedule I or II of the Controlled Substances Act, if that trafficking is prohibited by federal law or the law of the state where the business operates. Because marijuana has been a Schedule I drug since 1970, every state-licensed marijuana business has been “trafficking” for federal tax purposes, even though it operates legally under state law.
Congress added 280E in 1982 after the Tax Court allowed an illegal drug dealer, in a case known as Edmondson, to deduct ordinary business expenses. Lawmakers had street dealers in mind. Four decades later, the provision mainly hits licensed businesses that file returns and pay taxes.
How 280E Works in Practice
Most businesses pay income tax on net income: revenue minus the cost of goods sold, minus operating expenses such as rent, payroll, advertising and utilities. Under 280E, a cannabis business can still subtract the cost of goods sold, because that reduces gross income rather than counting as a deduction. It cannot subtract most other expenses.
The simplified illustration below uses round, hypothetical numbers to show the effect:
| Line item | Ordinary business | Business under 280E |
|---|---|---|
| Revenue | $1,000,000 | $1,000,000 |
| Cost of goods sold | −$500,000 | −$500,000 |
| Gross profit | $500,000 | $500,000 |
| Rent, payroll, marketing, security and other operating expenses | −$400,000 (deductible) | $0 deductible |
| Taxable income | $100,000 | $500,000 |
| Federal corporate tax at 21% | $21,000 | $105,000 |
In this example the 280E business pays five times more federal tax on the same economics, and its tax bill is larger than its actual profit. That is why 280E is often blamed for thin margins, high shelf prices and cannabis company failures.
Which Businesses Does 280E Affect?
| Business type | Subject to 280E? (October 2026) |
|---|---|
| Adult-use (recreational) dispensaries, growers and processors | Yes. Adult-use marijuana remains Schedule I. |
| State-licensed medical marijuana operators, for their medical activity | No, for that marijuana, since the April 2026 Schedule III order. Details and transition rules are still being clarified. |
| Businesses with both medical and adult-use activity | Partly. The adult-use side stays under 280E; costs must be split between the two, and Treasury guidance on how is pending. |
| Unlicensed marijuana sellers | Yes. Unlicensed marijuana remains Schedule I. |
| Ancillary businesses that never touch the plant (landlords, software, packaging, accessories, consultants) | Generally no, because they do not traffic in a controlled substance. |
| Hemp and CBD businesses selling products that meet the federal hemp definition | No, because federal hemp is not a controlled substance. Products that fall outside the new hemp definition under the 2025 hemp law could raise different questions. |
The phrase “plant-touching” is the practical test: if your business grows, processes or sells adult-use marijuana, 280E applies.
Key Court Cases
- CHAMP (2007). In Californians Helping to Alleviate Medical Problems v. Commissioner, the Tax Court let a San Francisco collective deduct expenses tied to a genuinely separate caregiving business it ran alongside its marijuana sales. It opened the door to “separate trade or business” arguments.
- Olive (2012, affirmed 2015). This is the case our original article covered. Martin Olive’s Vapor Room argued that 280E should not apply to a business operating legally under California law. Tax Court Judge Diane Kroupa rejected that, holding that state legality doesn’t matter, and that the free snacks, games and activities the Vapor Room offered were not a separate business. The Ninth Circuit Court of Appeals affirmed in 2015.
- Harborside (2018, affirmed 2021). In Patients Mutual Assistance Collective Corp. v. Commissioner, the Tax Court applied 280E to Oakland‘s Harborside dispensary, one of the largest in the country, and limited its cost of goods sold to the inventory-costing rules that apply to resellers. The Ninth Circuit affirmed.
Together, these cases made clear that state legality is no defense, that a separate non-cannabis business must be truly separate to count, and that cost-of-goods-sold calculations get close IRS scrutiny.
How Rescheduling Changes 280E in 2026
In April 2026, the Justice Department and DEA issued a final order moving two categories of marijuana to Schedule III: FDA-approved marijuana products, and marijuana held under a qualifying state medical marijuana license. Because 280E applies only to Schedule I and II substances, businesses whose activity now involves only Schedule III marijuana are no longer barred from taking deductions. Treasury and the IRS said in an April 23, 2026 statement that rescheduling generally removes 280E as a bar for businesses that no longer traffic in Schedule I or II substances (Freeman Law summary).
What is settled and what is not, as of October 2026:
- Adult-use businesses get no relief yet. Recreational marijuana stays in Schedule I. A DEA hearing on moving all marijuana to Schedule III ran from June 29 to July 15, 2026, but the chief administrative law judge stayed the proceeding on September 29, 2026, and there is no decision. Our guide to marijuana rescheduling tracks the status.
- Current-year treatment. Tax practitioners report that Treasury expects to let qualifying medical activity be treated as Schedule III for the full taxable year that includes the order’s effective date, but formal guidance had not been issued as of this writing.
- Prior years. The order encouraged Treasury to consider retroactive relief for years when a business held a state medical license, but nothing is confirmed. Advisers have suggested protective refund claims to keep open years alive; federal refund claims generally must be filed within three years of filing the return or two years of paying the tax, whichever is later.
- Mixed businesses. Operators with both medical and adult-use sales must apportion expenses between the two. Members of Congress asked Treasury for guidance in May 2026; none had been published as of October 2026.
- Which state licenses qualify. States structure medical programs differently. Washington, for example, handles medical sales through medically endorsed retail stores rather than separate medical dispensaries. How the order applies to each state’s model is a question for a cannabis tax professional.
- Litigation. Challenges to the April 2026 order are pending in the D.C. Circuit, so the rules could still change.
Does 280E Apply to State Taxes?
Section 280E is federal. States that base their income tax on the federal code may carry it over unless they decouple, and several states, including California, have changed their own laws to let licensed cannabis businesses deduct ordinary expenses on state returns. Washington has no state income tax; cannabis businesses there pay the 37% excise tax on retail sales, state business and occupation tax and sales tax, while 280E bites on the federal return. See our Washington and Oregon law guides for state tax rates.
Why 280E Matters to Consumers
Every dollar a dispensary pays in extra federal tax is a dollar that doesn’t go to lower prices, higher wages or better service. 280E sits alongside the banking problem described in our guide to why dispensaries are cash only. For the bigger picture, read our federal marijuana law guide.
280E Cannabis FAQ
What does 280E mean for cannabis businesses?
It bars businesses that traffic in Schedule I or II substances from deducting ordinary expenses or claiming credits. Cannabis businesses can subtract cost of goods sold but not most rent, payroll, marketing or other operating costs.
Does 280E still apply after rescheduling?
For adult-use businesses, yes. The April 2026 order moved only state-licensed medical marijuana and FDA-approved products to Schedule III, so recreational operators remain covered until all marijuana is rescheduled.
Can dispensaries deduct cost of goods sold?
Yes. Cost of goods sold reduces gross income and is not a deduction, so 280E does not block it. Courts have limited how broadly retailers can define it.
Does 280E apply to CBD and hemp businesses?
Not to businesses selling products that meet the federal hemp definition, because hemp is not a controlled substance. Products that fall outside the tightened 2025 hemp definition could be treated differently.
Can medical marijuana businesses get refunds for past 280E taxes?
Possibly, but it is not settled. The April 2026 order encouraged Treasury to consider retroactive relief, and some advisers recommend protective refund claims. Talk to a cannabis tax professional.
Is 280E unconstitutional?
Courts have repeatedly upheld it. Cannabis businesses have challenged 280E on several grounds without success, so changing it depends on rescheduling or an act of Congress.
For adults 21+ in legal states. General information, not tax, legal or medical advice. Talk to a qualified cannabis tax professional about your business.
