How Are Cannabis Businesses Taxed in California? What Does IRS Section 280E Mean? 10 Costly Tax Mistakes Explained.

A Practical Guide for Financial Advisors and Insurance Agents

Navigating IRS Section 280E and California Cannabis Tax: An FAQ for 2026

IRS Section 280E prohibits businesses trafficking in Schedule I or II controlled substances from deducting ordinary business expenses, profoundly impacting federal tax liabilities for cannabis companies nationwide. In California, cannabis businesses navigate additional layers of state and local taxation, with recent federal rescheduling offering significant relief to state-licensed medical cannabis operators for 2026 and beyond.

Key Takeaways

IRS Section 280E disallows most business deductions for companies dealing in federally illegal Schedule I or II substances.
As of April 28, 2026, state-licensed medical cannabis and FDA-approved cannabis products were rescheduled to Schedule III, exempting their operators from Section 280E for those specific activities.
Recreational (adult-use) cannabis remains a Schedule I substance, meaning Section 280E still applies fully to these operations.
California cannabis businesses face state excise tax (15% until June 30, 2028), state sales tax (minimum 7.25%), and various local taxes, combining for effective rates often between 27% and 38%.
The California cultivation tax was repealed on July 1, 2022.
Cost of Goods Sold (COGS) remains deductible under federal law for all cannabis businesses, as it reduces gross income, not taxable income through deductions.
Careful accounting, proper expense apportionment for dual-licensed businesses, and specialized tax counsel are crucial to avoid costly mistakes and audits.
The “One Big Beautiful Bill” (OBBB), signed in 2025, superseded previous tax acts, establishing the current overarching federal tax framework for 2026; however, the core of Section 280E’s application to cannabis is tied to federal drug scheduling, which was specifically updated for medical cannabis in April 2026.

What is IRS Section 280E and How Does it Affect Cannabis Businesses?

IRS Section 280E is a provision in the Internal Revenue Code that disallows tax deductions and credits for any amount paid or incurred during the taxable year in carrying on any trade or business if such trade or business consists of trafficking in controlled substances listed under Schedule I or II of the Controlled Substances Act (CSA) which is prohibited by federal law. Enacted in 1982, its original intent was to prevent drug traffickers from claiming business deductions for illicit activities. Because cannabis was classified as a Schedule I controlled substance for decades, all state-legal cannabis businesses, even those fully licensed under state law, were subjected to this rule.

For affected businesses, Section 280E created an exceptionally high effective federal tax rate. While typical businesses deduct ordinary and necessary operating expenses like rent, payroll, utilities, and marketing to reduce their taxable income, cannabis businesses previously could not. This meant they paid federal income tax on a much larger portion of their gross revenue, often leading to effective tax rates as high as 70% or more, significantly impacting profitability and cash flow.

How Did the 2026 Federal Rescheduling Impact Section 280E?

A significant shift occurred in April 2026. The Department of Justice (DOJ) and the Drug Enforcement Administration (DEA) issued a final order rescheduling certain categories of cannabis from Schedule I to Schedule III of the Controlled Substances Act (CSA). Specifically, this change, effective April 28, 2026, applies to state-licensed medical marijuana and FDA-approved cannabis products.

This rescheduling has a profound positive impact on these specific cannabis businesses. Since Section 280E only applies to Schedule I or II controlled substances, state-licensed medical marijuana operators and those dealing in FDA-approved cannabis products are generally no longer subject to its restrictions for these activities. This means they can now deduct ordinary business expenses such as payroll, rent, marketing, and other operating costs, significantly reducing their federal tax liability and potentially increasing their profitability and capacity for reinvestment. The Treasury and IRS have indicated that this action will have “significant positive tax consequences” for the medical marijuana industry.

Who is Still Affected by IRS Section 280E in 2026?

Despite the rescheduling of medical cannabis, recreational (adult-use) cannabis remains classified as a Schedule I controlled substance under federal law as of mid-2026. Consequently, businesses involved in the trafficking of adult-use cannabis are still fully subject to the provisions of IRS Section 280E.

This creates a “mixed-status problem” for businesses that operate under a dual license, selling both medical and recreational cannabis, or even for those with intertwined operations. These dual-licensed operators will need to meticulously segregate their expenses between Schedule I (recreational) and Schedule III (medical) activities. The IRS is expected to issue guidance, including transition rules and details on expense apportionment, to help these businesses navigate their federal tax obligations accurately.

What Expenses are Deductible Under IRS Section 280E (Specifically Cost of Goods Sold – COGS)?

Even under the strictest application of Section 280E, one crucial category of expenses has always remained deductible: the Cost of Goods Sold (COGS). COGS is not considered a business deduction but rather a reduction of gross income, meaning it is subtracted before calculating gross profit, which then forms the basis for taxable income.

The calculation of COGS under Section 280E is governed by Section 471 of the Internal Revenue Code, specifically as it existed when 280E was enacted. It is critical to understand that Section 263A, which allows for the capitalization of certain additional costs into inventory for other industries, generally cannot be used to push otherwise disallowed expenses into COGS for cannabis businesses.

For Retail/Dispensaries: COGS is generally limited to the direct costs of acquiring inventory, such as the purchase price of cannabis products from cultivators or manufacturers, inbound freight, and handling costs directly related to getting the inventory ready for sale. Expenses like rent for the retail space, employee wages for sales staff, marketing, and administrative costs are typically not included in COGS for dispensaries.
For Cultivation/Production: Producers have a broader scope for COGS. They can include direct labor costs involved in growing or manufacturing, direct material costs (seeds, nutrients, packaging), and certain production-related overhead expenses. However, general administrative, marketing, and non-production expenses still do not qualify.

Accurate and well-supported COGS calculations are paramount for cannabis businesses, as they represent the primary leverage point for reducing federal taxable income under 280E for recreational activities and are also vital for all operations to determine true profitability. The IRS scrutinizes COGS closely, requiring meticulous record-keeping, inventory reconciliation, vendor documentation, and consistent application of labor and overhead allocations.

How Are Cannabis Businesses Taxed in California for 2026?

California’s legal cannabis market is a significant revenue generator for the state, having generated over $8.1 billion in tax revenue since legal sales began in 2018, with approximately $248 million collected in the first quarter of 2026 alone. Cannabis businesses in California are subject to a multi-layered tax structure that includes state excise tax, state sales tax, and various local taxes.

The state’s approach to cannabis taxation is distinct from federal regulations and is generally more favorable, as California decouples from federal limitations like Section 280E for state tax purposes, allowing businesses to deduct ordinary expenses on their California state tax returns.

What Are the Current California Cannabis Tax Rates?

For 2026, California cannabis businesses face the following primary tax components:

State Cannabis Excise Tax: This tax is set at 15% of the gross receipts from licensed retail cannabis sales. Assembly Bill 564, enacted in 2025, lowered this rate from 19% to 15% until June 30, 2028, aiming to help the legal industry remain competitive. Retailers are required to collect this tax from buyers.
State Sales Tax: California’s statewide sales tax rate is 7.25%, but local additions can increase it to 10.5% or more. Importantly, the state sales tax is applied to the price of the cannabis product after the 15% state cannabis excise tax has been added.
Local Cannabis Business Taxes: Many cities and counties impose their own cannabis business taxes, which can vary widely, typically ranging from 0% to 10%. These taxes can be levied on gross receipts from sales, cultivation, manufacturing, or other commercial activities, depending on local ordinances. For example, Los Angeles voters approved Measure CB in June 2026 to apply local taxes (10% on sales, 5% on medical sales, 2% on manufacturing/cultivation, 1% on testing/transportation) to *unlicensed* cannabis businesses.
Cultivation Tax: The state cultivation tax was repealed as of July 1, 2022.

When combined, the effective cannabis tax rate in California can range from approximately 27% to 38%, depending on the specific city and local tax rates. Medical cannabis patients holding a valid Medical Marijuana Identification Card (MMIC) are typically exempt from both the state sales tax and the state cannabis excise tax on their qualifying purchases.

How Do Federal and California Cannabis Tax Rules Interact?

The interaction between federal and California cannabis tax rules creates a complex landscape for businesses. The fundamental distinction lies in how each jurisdiction views cannabis’s legality.

Federal Perspective: Under federal law, recreational cannabis remains a Schedule I controlled substance. This triggers IRS Section 280E, which, as discussed, disallows most ordinary business deductions for federal income tax purposes. While state-licensed medical cannabis received relief from 280E in April 2026 due to rescheduling, the federal government still considers all cannabis activity highly regulated and, for recreational use, federally prohibited.
California Perspective: California, having legalized both medical and recreational cannabis under Proposition 64, has established its own comprehensive regulatory and tax framework. Crucially, California’s state tax code generally decouples from federal restrictions like Section 280E. This means that for purposes of calculating California state income tax, cannabis businesses can deduct ordinary and necessary business expenses, including rent, payroll, and advertising, which are disallowed at the federal level for recreational operations. This state-level deductibility significantly reduces the overall state tax burden for California cannabis businesses compared to their federal obligations for recreational activities.

Therefore, a California cannabis business must maintain two distinct sets of books and prepare separate tax calculations-one adhering to federal 280E limitations (for recreational activities) and another complying with California’s more permissive state tax laws. This dual compliance is a significant administrative and financial challenge.

Which Cannabis Businesses Face the Greatest Tax Burden?

The cannabis businesses facing the greatest overall tax burden are typically those involved primarily or exclusively in recreational (adult-use) cannabis sales and cultivation, especially if they operate in jurisdictions with high local taxes.

Federal Level: Recreational cannabis businesses are still fully subject to IRS Section 280E, which prevents them from deducting most ordinary business expenses from their federal taxable income. This leads to extremely high effective federal tax rates, often between 40% and 70% of gross profit. The inability to deduct core operating costs like rent, payroll, and marketing creates a significant discrepancy between actual cash flow and taxable income.
State and Local Level: While California’s state tax code is more favorable than federal law, the cumulative impact of the 15% state excise tax, standard state sales tax, and any additional local business taxes (which can range significantly) further adds to the burden. Businesses in areas with higher local tax rates will naturally experience a heavier overall burden.
Dual-Licensed Operators: Businesses with both medical and recreational licenses, if not properly segregating their operations and meticulously apportioning expenses, can inadvertently apply the stricter 280E rules to their newly exempted medical activities, thereby increasing their tax burden unnecessarily.

In contrast, state-licensed medical cannabis businesses now have a considerably lighter federal tax burden due to the 2026 rescheduling, as they can deduct ordinary business expenses for those qualifying activities. This creates a competitive advantage for medical-focused operations.

What Are Common Misconceptions About Cannabis Taxation?

Navigating cannabis tax law is complex, leading to several common misunderstandings:

Misconception 1: Federal Legalization Means Tax Parity. Many assume that as more states legalize cannabis, federal tax treatment will automatically align with other legal businesses. However, until federal descheduling or full legalization occurs for *all* cannabis, IRS Section 280E continues to apply to recreational operations, even in states where cannabis is legal. The 2026 rescheduling only addresses medical cannabis.
Misconception 2: Section 280E Means You’re Taxed on Gross Revenue. While 280E significantly limits deductions, it does not mean businesses are taxed on their entire gross revenue. Cost of Goods Sold (COGS) is always deductible as it reduces gross income, not taxable income through deductions. Mismanaging COGS is a costly error.
Misconception 3: State Decoupling from 280E Resolves Federal Issues. While California and other states allow deductions for state tax purposes despite 280E, this *does not* affect federal tax liability. Businesses must still comply with federal 280E for their federal tax filings (for recreational activities).
Misconception 4: All Cannabis Businesses are Now Exempt from 280E. Following the April 2026 rescheduling, this is a dangerous oversimplification. Only state-licensed medical cannabis activities and FDA-approved products are exempt. Recreational cannabis operations remain fully subject to 280E.
Misconception 5: Cash-Heavy Operations are Undetectable. Due to federal banking restrictions, many cannabis businesses operate with large amounts of cash. However, this actually makes them a higher audit target for the IRS, which closely scrutinizes cash-heavy businesses for unreported income and Form 8300 compliance.

What Are the 10 Most Costly Tax Mistakes for Cannabis Businesses?

Given the intricate tax landscape for cannabis businesses, particularly those dealing with IRS Section 280E and California cannabis tax, avoiding common pitfalls is essential. These mistakes can lead to severe penalties, back taxes, and even business closure.

Improperly Deducting Non-COGS Expenses Under 280E (for Recreational Cannabis): This is consistently the most damaging and frequent error. For recreational cannabis businesses, deductions for operating expenses such as rent for retail or office space, employee payroll (excluding direct production labor for COGS), marketing, advertising, utilities, and professional fees are strictly prohibited under Section 280E. The IRS and tax courts have repeatedly upheld these disallowances, leading to significant back taxes and penalties.
Inaccurate or Unsupported Cost of Goods Sold (COGS) Calculations: While COGS is deductible, miscalculating it or failing to maintain robust documentation is a major audit trigger. The IRS demands meticulous records to support inventory purchases, direct labor, and allowable production overhead. Overstating COGS by including non-allowable expenses is a common error.
Failure to Apportion Expenses for Mixed (Medical/Recreational) Operations: For businesses with both medical (Schedule III) and recreational (Schedule I) activities, failing to accurately apportion shared expenses (e.g., rent for a facility used for both) between the two distinct business lines will lead to penalties. Expenses attributable to Schedule III medical activities are now deductible, while those for Schedule I recreational activities are not (beyond COGS). This requires detailed internal accounting and separate record-keeping.
Not Hiring a Specialized Cannabis CPA: Attempting to manage complex cannabis taxation with a generalist CPA or through DIY methods is a critical mistake. Cannabis tax law, especially the nuances of Section 280E and state-specific regulations, requires specialized expertise. An inexperienced accountant may make improper deductions or overlook critical compliance requirements, inviting audits and assessments.
Not Making Estimated Federal Tax Payments: Cannabis businesses, particularly those with high effective tax rates due to 280E, often face substantial tax liabilities. Failure to make timely and adequate estimated tax payments throughout the year can result in significant underpayment penalties.
Poor Record-Keeping and Lack of Audit-Ready Documentation: The IRS targets cannabis businesses for audits at a higher rate due to compliance risks. Inadequate or disorganized financial records-including sales data, inventory logs, payroll records, bank statements (even for cash transactions), and state seed-to-sale tracking data-can be fatal during an audit. Discrepancies between state tracking and reported income are major red flags.
Misclassifying Employees or Independent Contractors: Incorrectly classifying workers can lead to significant payroll tax liabilities, penalties, and interest. Cannabis businesses must adhere to IRS guidelines for employee versus independent contractor status.
Ignoring State and Local Tax Compliance: Focusing solely on federal taxes while neglecting California’s specific excise, sales, and local taxes can lead to state-level penalties. Each jurisdiction has its own filing requirements, due dates, and audit procedures.
Failure to Comply with Form 8300 for Cash Transactions: Businesses that receive more than $10,000 in cash in a single transaction or related transactions must file Form 8300 with the IRS. Due to federal banking restrictions, cannabis businesses are often cash-heavy, making compliance with this often-overlooked requirement crucial to avoid severe penalties.
Prematurely Amending Prior-Year Federal Returns for 280E Relief: While the April 2026 medical cannabis rescheduling is a positive development, the IRS has explicitly cautioned against amending prior-year returns seeking retrospective 280E relief before official guidance is issued. Acting prematurely carries procedural and audit risks, as the effective date and transition rules for prior periods are still being clarified by the Treasury.

What is the Latest IRS Guidance for Cannabis Businesses in 2026?

Following the monumental decision in April 2026 by the DOJ and DEA to reschedule state-licensed medical marijuana and FDA-approved cannabis products to Schedule III, the Treasury and IRS promptly announced their plans to issue comprehensive guidance. This forthcoming guidance is expected to address several critical areas:

Clarification on 280E Applicability: The guidance will detail how Section 280E applies to businesses with multiple activities, especially those operating both Schedule I (recreational) and Schedule III (medical) cannabis operations. It is anticipated to clarify the methodologies for properly apportioning expenses between these distinct activities.
Transition Rules: The IRS plans to include transition rules, indicating that for purposes of Section 280E, the rescheduling will generally be considered to apply for a business’s full taxable year that includes the effective date of April 28, 2026, for activities no longer involving Schedule I or II controlled substances. This means qualifying medical cannabis businesses may potentially deduct expenses for the entire 2026 tax year for those activities.
Retroactive Relief: While the April 2026 final rule encourages the Secretary of the Treasury to consider retrospective relief from Section 280E liability for prior taxable years of state-licensed medical cannabis operations, the IRS has not yet committed to this. Tax professionals are advised against prematurely amending prior-year returns until explicit IRS guidance on retroactive relief is published. The DEA itself acknowledged its lack of authority over tax matters, advising taxpayers to consult counsel.

As of mid-2026, cannabis tax law, especially at the federal level, remains a rapidly evolving area. Businesses are strongly advised to consult with specialized tax counsel and stay updated on official IRS publications and pronouncements to ensure ongoing compliance.

Conclusion

The tax landscape for cannabis businesses in 2026 is one of significant change and enduring complexity. While the federal rescheduling of medical cannabis offers long-awaited relief from IRS Section 280E for qualifying operators, recreational cannabis businesses continue to face a stringent federal tax burden. Concurrently, California’s robust state and local tax structure demands careful adherence. Success in this evolving industry hinges on a deep understanding of these layered regulations, meticulous record-keeping, strategic financial planning, and the indispensable guidance of specialized tax professionals. Proactive compliance and a commitment to staying informed on federal and state legislative and regulatory developments are paramount for the sustained viability and growth of cannabis enterprises across the nation.

References

Join Cal NORML’s Fight for Fair Taxation of Cannabis in California – CaNorml.org (2026) –

California Cannabis Tax Rate 2026 | Excise + Sales + Local Taxes (2026) – vertexaisearch.cloud.google.com

Section 280E and Cannabis Taxation After the 2026 Rescheduling – Madras Accountancy (2026) – vertexaisearch.cloud.google.com