White Paper · Cannabis Tax · Schedule III

Schedule III and §280E: What Actually Changes for Cannabis Operators

DEA’s April 28, 2026 final rule did not move every marijuana business into Schedule III. The tax consequence turns on whether the operator’s activity is within the rule’s state-medical-marijuana category, while adult-use and other unlicensed marijuana remain Schedule I.

By Lincoln Square Law · 8-minute read

Start with the scope of the April 28 final rule

The April 28, 2026 final rule places two categories in Schedule III: FDA-approved drug products containing marijuana and marijuana subject to a state medical marijuana license. The rule expressly states that marijuana in other forms remains Schedule I. That distinction is the first tax question because Internal Revenue Code section 280E applies to a trade or business that consists of trafficking in controlled substances prohibited by federal or state law when those substances are in Schedule I or II (91 Fed. Reg. 22714, 26 U.S.C. § 280E).

For operators, “marijuana was rescheduled” is therefore too broad. A vertically integrated company can have medical activity that fits the final rule and adult-use activity that does not. A multi-state group can operate under different license structures. A company may also handle products or inventory that are not within the state-medical category described by the rule. The federal scheduling analysis has to follow the specific licensed activity and product.

The rule took effect April 28, 2026. It also establishes federal registration requirements for the Schedule III activity. State authorization and federal registration are separate layers. A state medical license does not erase the Controlled Substances Act. It is part of the category the rule moved, and covered handlers still face federal registration, recordkeeping, security and related requirements described in the rule.

For diligence and financing, preserve the federal registration path alongside the state license. A lender, buyer or auditor assessing the post-rule tax position should be able to see the state medical authority, the federal rule relied on, the DEA registration status, and the business activity tied to the revenue. That evidence helps prevent a tax assumption from outrunning the regulatory facts, particularly where an operator has multiple license types or where a transaction closes during the transition.

Why §280E changes for qualifying state-medical activity

Section 280E denies deductions and credits for a trade or business consisting of trafficking in Schedule I or II controlled substances, subject to the statutory wording. Because the final rule places marijuana subject to a state medical marijuana license in Schedule III, the Acting Attorney General states that state licensees covered by the rule will no longer be subject to the section 280E deduction disallowance as a consequence of the rule (91 Fed. Reg. 22714, 22719-20).

The same Federal Register discussion immediately adds an important qualification: nothing in the rule is a determination of federal tax liability, and qualifying state licensees should consult tax counsel about their circumstances. That is not boilerplate. Tax treatment depends on the taxpayer, the activity, the period, entity structure, accounting method and whether the activity actually falls within the Schedule III category.

Operators should therefore replace the shorthand “280E is gone” with a documented scope conclusion. Identify the licensed medical operations that are within the federal rule, the effective date, the entities earning the revenue, and any adult-use or other Schedule I activity that remains outside the rule. The tax return should follow that analysis rather than a marketing statement about rescheduling.

Adult-use operations require a separate answer

The final rule says marijuana other than an FDA-approved drug product or marijuana subject to a state medical marijuana license remains Schedule I. Adult-use activity therefore does not become Schedule III simply because the same state also licenses medical cannabis or because the same facility serves both markets. Where the business traffics in marijuana that remains Schedule I, section 280E remains relevant under its terms.

This makes shared operations a fact-intensive area. A single entity may have medical and adult-use sales, shared employees, shared premises, shared inventory systems and shared overhead. The statute does not supply a simple allocation formula for a mixed post-rule cannabis business. The business should identify which revenue streams and legal activities fall within which scheduling category and coordinate the tax method with qualified tax counsel.

Avoid creating artificial allocations solely to manufacture a tax result. The records should reflect the business as it actually operates. License records, point-of-sale classifications, inventory movement, purchase records, payroll, facility use and general-ledger coding should tell a consistent story. If the company cannot explain its own separation of medical and adult-use activity, the return position will be difficult to support.

The rule does not grant retroactive §280E relief

The Federal Register rule encourages Treasury to consider retrospective relief for taxable years in which a state licensee operated under a state medical marijuana license, but it does not itself provide that relief. The rule also says it does not determine federal tax liability. Operators should not amend prior returns simply because the DEA discussion expresses a policy preference (91 Fed. Reg. 22714, 22720).

Prior periods need their own legal and tax analysis. The question includes what schedule applied during the taxable year, what law governed the taxpayer’s activity, what positions were taken on filed returns, and whether later Treasury or IRS authority changes the available treatment. A regulatory preamble from DEA is not a substitute for tax authority administered by Treasury and the IRS.

Preserve historical workpapers. If future authority permits relief, the company will need clean records to evaluate it. If no relief arrives, the same records support the filed position. The correct posture is readiness, not assuming a refund before Treasury acts.

Inventory accounting still needs disciplined records

Removing a deduction disallowance from qualifying activity does not eliminate ordinary tax accounting rules.

Section 471 requires inventories when necessary to clearly determine income and authorizes inventory methods conforming as nearly as possible to best accounting practice and clearly reflecting income (26 U.S.C. § 471).

Cannabis companies should not treat Schedule III as permission to move every cost into cost of goods sold or, conversely, to continue a historical 280E-era chart of accounts without review.

Reconcile tax accounting to operational records. Cultivation, manufacturing, distribution and retail activities can have different cost flows. The company should preserve purchasing, labor, production, yield, waste, transfer, testing and inventory records that allow its tax advisers to apply the appropriate tax accounting rules.

Recommendations about chart-of-account design should be coordinated with the actual business process rather than imposed after year end.

This is also the moment to review financial models. If a medical business previously modeled cash taxes using a 280E assumption, the change can affect estimated tax payments, covenant calculations, transaction models and distributions. Those business consequences should be updated only after the company confirms that the relevant operation is within the Schedule III rule.

Use a tax transition file for 2026

A defensible 2026 file should identify each legal entity, state license, medical or adult-use activity, effective date, federal registration status, revenue classification, inventory flow and tax-accounting treatment. Attach the primary authorities used for the conclusion and record any judgment about mixed activity. Then connect the legal map to the general ledger and return workpapers.

For transactions, the buyer and seller should address the same issues during diligence. Purchase agreements and tax covenants should not assume that all cannabis revenue is post-280E revenue. Historical exposures, amended-return rights, tax refunds, audits, indemnities and purchase-price calculations may turn on how the business classified its activities before and after April 28.

The April rule creates a meaningful tax change for qualifying state-medical activity, but it is narrower than the slogan “Schedule III ends 280E.” The useful question is which taxpayer activity moved out of Schedule I, when, and what records demonstrate that conclusion. That is the analysis that should drive the return, the forecast and the transaction model.