What Is IRC Section 280E? A Cannabis Business Owner's Guide

If you operate a cannabis business in the United States, IRC Section 280E is the most important tax provision you will ever deal with. It is also the most misunderstood. Most operators know the basics — "you can't deduct business expenses" — but few understand exactly why, what exceptions exist, or how to legally minimize their exposure.

This guide covers everything a cannabis business owner needs to know about 280E: what the law says, where it came from, how it applies to your specific business structure, and what you can do about it.

The Plain-English Version of 280E

IRC Section 280E states that no deduction or credit is allowed for any expense incurred in a trade or business that involves trafficking in controlled substances prohibited under federal law. Cannabis — regardless of state legality — remains a Schedule I controlled substance under the federal Controlled Substances Act.

The practical result: a cannabis dispensary earning $2 million in revenue with $1.5 million in operating expenses cannot deduct those expenses against its income. It pays federal income tax on the full $2 million, not on its $500,000 net profit. This is why cannabis businesses routinely face effective tax rates of 60–80%, compared to 21–30% for most other businesses.

Where 280E Came From

Congress enacted Section 280E in 1982, ironically motivated by a convicted drug dealer. In Jeffrey Edmonson v. Commissioner, a cocaine dealer successfully argued he was entitled to business expense deductions for packaging, scales, and other costs of his drug trade. The IRS lost. Congress responded by passing 280E to ensure that outcome could never happen again.

The provision was written to target criminal enterprises. Nobody in 1982 anticipated that legal, state-licensed cannabis businesses would one day be caught in its net. But the statute does not distinguish between criminal dealers and state-licensed operators — both traffic in federally illegal substances, and both are subject to 280E's blanket denial of deductions.

The result is a tax law written for criminals that now applies almost exclusively to licensed businesses operating legally under state law. Multiple court challenges have failed, and despite bipartisan awareness of the problem, Congress has not repealed or amended 280E as of this writing.

What 280E Actually Prohibits

Section 280E denies all deductions under Section 162 (ordinary and necessary business expenses) and Section 212 (expenses for the production of income). In practice, this means cannabis businesses cannot deduct:

• Employee salaries and wages (for non-production staff)
• Rent and utilities for retail or administrative space
• Marketing and advertising expenses
• Professional fees (legal, accounting)
• Insurance premiums
• Banking fees
• Software subscriptions and equipment

These are legitimate operating expenses that every other business in America deducts without question. Under 280E, they are non-deductible for cannabis operators.

The One Exception: Cost of Goods Sold

Here is the critical exception that every cannabis business must understand: 280E does not prohibit Cost of Goods Sold (COGS) deductions.

The reason is technical but important. COGS is not a deduction under Section 162 — it is an adjustment to gross income under Section 471, which governs inventory accounting. Since 280E only blocks Section 162 and 212 deductions, COGS remains fully deductible.

This is why COGS calculation is the single most important financial exercise for any cannabis business. Every dollar correctly allocated to COGS is a dollar that escapes 280E's reach. Getting it right can mean the difference between a sustainable business and one that pays more in taxes than it earns in profit.

What qualifies as COGS depends on your business type — and getting the classification wrong in either direction creates problems. We cover this in detail in our guide: How to Calculate COGS for Your Cannabis Business Under 280E.

How 280E Affects Different Cannabis Business Types

Dispensaries / Retailers

Retailers have the narrowest COGS base. Your deductible costs are limited to the wholesale price of inventory you purchased plus the direct costs to bring that inventory to a saleable condition. Most selling, administrative, and occupancy expenses are non-deductible. This typically results in the highest effective tax rates in the cannabis supply chain.

Cultivators / Growers

Cultivators often have more COGS to work with. Direct production costs — seeds, nutrients, grow media, water, electricity in the grow facility, labor directly involved in cultivation — can all be capitalized into inventory costs and flow through as COGS. The key is meticulous documentation of every expense tied to actual plant production.

Processors / Manufacturers

Processors can include raw material costs plus direct production labor and manufacturing overhead. Like cultivators, the challenge is correctly separating production costs (COGS-eligible) from administrative costs (non-deductible).

Vertically Integrated Operators

Businesses that cultivate, process, and retail face the most complex 280E situations. Each segment has different COGS bases, and intercompany transactions must be carefully documented. Vertically integrated operators often benefit most from rigorous expense allocation — but they also face the most audit risk if that allocation is poorly documented.

The "Separate Business" Strategy: Use Carefully

Some cannabis businesses attempt to separate non-cannabis activities (consulting, ancillary services) into a distinct legal entity, arguing that the separate entity is not subject to 280E. Courts have reviewed this strategy, and the IRS is extremely skeptical. The separate business must be genuinely separate — different management, different location, different customers, separate accounting — not just a paper entity created to shift expenses.

The Tax Court rejected this structure in several cases where the "separate business" had no independent economic activity. Do not pursue this strategy without experienced cannabis tax counsel, and do not rely on it as a primary mitigation approach.

The Path Forward: Federal Rescheduling

The most significant potential change to 280E's application is federal rescheduling of cannabis. If cannabis moves from Schedule I to Schedule III of the Controlled Substances Act, 280E would no longer apply — because Schedule III substances are not "controlled substances" under the provision's specific language.

The DEA proposed rescheduling in 2024, and the process remains ongoing. If rescheduling is finalized, the financial impact on cannabis businesses would be immediate and transformational — effective tax rates could drop by 40 percentage points or more for some operators.

Until that happens, 280E is the law of the land. Every cannabis business must operate under it, optimize within it, and document everything carefully.

What You Should Be Doing Right Now

Understanding 280E is step one. Doing something about it is step two. The practical actions every cannabis operator should take:

• Separate your chart of accounts by function — production vs. non-production, so COGS-eligible costs are clearly separated from the start
• Document every production cost — time cards for production staff, utility usage by facility area, equipment depreciation schedules for production equipment
• Allocate shared costs properly — when a space or employee serves both production and retail functions, document the allocation methodology and apply it consistently
• Run a 280E calculation before year-end — not at tax time. By the time your CPA files, it's too late to restructure anything. See where you stand in Q3 and Q4.
• Get everything in writing — the IRS audits cannabis businesses at higher rates than almost any other industry. Documentation is your defense.

The free TrimBooks calculator can show you your estimated COGS allocation and tax liability based on your actual expense data. It won't replace a CPA for final filings, but it gives you a clear picture of where you stand before expensive professional time is consumed.

Related Guides

Now that you understand what 280E is, the next step is understanding how to maximize your COGS allocation:

• How to Calculate COGS for Your Cannabis Business Under 280E
• 280E Compliance Checklist: What Every Cannabis Operator Needs