280E Retrospective Relief: 7 Critical Steps for State Medical Cannabis Licensees

Part of The Schedule III Cannabis Hub

If you are a cannabis CFO or CPA, the most expensive sentence in the IRS code reads: “No deduction or credit shall be allowed for any amount paid or incurred… in carrying on any trade or business if such trade or business consists of trafficking in controlled substances… which are prohibited by Federal law… within the meaning of schedule I and II.” That is IRC § 280E, and for forty years it has done exactly one thing: turn cannabis dispensaries into the highest-effective-tax-rate businesses in the United States.

On April 22, 2026, DOJ moved a slice of marijuana to Schedule III. Schedule III is not in Section 280E. Two days later, Treasury and IRS issued a press release saying — in language that should make every cannabis CFO put down their coffee — that they are studying retrospective relief and apportionment guidance for state medical marijuana licensees.

We are now in the 280E retrospective relief window. This post explains what changed, why retrospective relief is plausible, and the seven things every operator and CPA should do this quarter to preserve the position.

What changed for 280E on April 22, 2026

The Final Order placed FDA-approved marijuana products and marijuana subject to a qualifying state-issued medical marijuana license into Schedule III. That matters because § 280E only disallows deductions for trafficking in controlled substances “within the meaning of schedule I and II.”

Schedule III is neither. Plain text of the statute. We did not write the statute. Congress wrote the statute and stopped at Schedule II in 1981 because they were targeting cocaine dealers, not state-licensed medical marijuana retailers that did not exist yet.

That gives every state medical marijuana licensee a textually clean argument that 280E does not apply to its covered activity going forward. DOJ said as much in the Final Order. Treasury / IRS said as much in their April 23 press release, including a direct reference to “potential retrospective relief for taxable years in which a state licensee operated under a state medical marijuana license.”

The qualifier matters. Retrospective relief is not automatic. The IRS has not yet issued formal guidance. Treasury’s process announcement signals the direction but does not set the rules. Operators who do not document their position now will find themselves litigating it in tax court in 2028.

Why retrospective relief is plausible

Three reasons:

1. DOJ explicitly invited it. The Final Order’s preamble and the April 23 DOJ press release both flag that “holders of state medical marijuana licenses will no longer be subject to the 280E deduction disallowance for covered activities” and encourage Treasury to consider retrospective relief.
2. Treasury announced a process. The April 23 Treasury press release (Treasury Sb 0471) signaled forthcoming guidance addressing tax consequences and explicitly mentioned mixed-business apportionment and transition-year treatment.
3. There is administrative precedent for retrospective relief in scheduling changes. When DEA descheduled an FDA-approved cannabidiol product in 2018, IRS treatment followed the schedule change. The pattern — schedule change → tax treatment follows — is established.

Retrospective relief is not the only possible outcome. Treasury could limit relief to taxable years after the Final Order’s effective date. Treasury could require activity-by-activity allocation that gives back much of the benefit. Treasury could decline to issue formal retrospective guidance and leave taxpayers to assert the position on amended returns at their own audit risk. The protective-claim strategy below is engineered to work in any of those scenarios.

7 critical steps for the 280E retrospective relief position

Step 1 — Document state medical marijuana license status for every taxable year you intend to claim

The federal predicate for 280E relief is that your activity was conducted “under a state medical marijuana license” during the relevant period. Pull the license records for every year you may amend. Capture issue dates, renewal dates, scope of authorization, license class, and any medical-endorsement designation. If your state added a medical endorsement to your previously adult-use-only license at some point, the date matters — relief likely runs from the endorsement effective date forward.

Step 2 — Allocate revenue by covered vs. non-covered activity

Treasury’s April 23 press release mentioned mixed-business apportionment. That signals operators will need to segment revenue between:

• Covered activity: sales under a state medical marijuana license (with the medical endorsement / patient certification / OTC therapeutic certification documented)
• Non-covered activity: any sales outside the medical channel, ancillary sales, accessories, hemp-derived products, non-cannabis revenue

If you have not already, set up your POS and seed-to-sale system to tag every transaction by category. Run the allocation back as far as your records allow. The operator with three years of clean transaction-level data is the operator who gets the cleanest refund.

Step 3 — Allocate costs by covered vs. non-covered activity

Same exercise on the expense side. COGS is already largely allowed under § 280E (the courts, including the Tax Court in Patients Mutual Assistance v. Commissioner, have permitted COGS via § 471). The question is non-COGS expenses — selling, general, administrative, marketing, rent. Build an allocation methodology that ties each expense category to covered vs. non-covered revenue. Document the methodology now so you are not improvising it under audit.

Step 4 — File protective claims for open taxable years

Statutes of limitations are short (generally three years from filing date, or two years from payment, whichever is later). If you wait for formal Treasury guidance, you may lose 2022 and earlier. File protective refund claims now (Form 1040X for individuals, Form 1120X for corporations). The protective claim does not require IRS to act immediately; it preserves your position when guidance lands. Standard practice in any retroactive tax change.

Step 5 — Update current-year tax positions

For taxable years 2026 forward — meaning, for the return you file in early 2027 — take the 280E-relief position on the original return for covered activity. Document the position. Disclose under Form 8275 (Disclosure Statement) if your CPA wants to be conservative. The disclosure protects against accuracy-related penalties if IRS later disagrees.

Step 6 — Coordinate with your state tax position

Many states’ cannabis taxation regimes either explicitly piggyback on federal § 280E disallowance or have parallel state provisions. State adjustments do not necessarily follow federal automatically. Review your state’s cannabis tax code, identify whether retrospective relief flows through, and file conforming protective state claims where applicable.

Step 7 — Build the audit-ready allocation file

Audit defense is documentation. Build the file now: license records, revenue segmentation, expense allocation methodology, transaction samples, medical-endorsement records, patient self-certification records (if applicable). When IRS opens the file in 2028, you want every question answered before they ask.

Common 280E retrospective relief mistakes

Mistake #1: Waiting for formal Treasury guidance before filing protective claims. Statutes of limitations don’t wait. File protective now.

Mistake #2: Treating all cannabis activity as covered. The Final Order covers state medical marijuana license activity. If you have ancillary, hemp-derived, or out-of-license activity, those don’t qualify and trying to claim them taints the protective claim.

Mistake #3: Using a single allocation method for revenue and expenses. Different categories sometimes need different methods. Document each.

Mistake #4: Failing to document license status changes over time. If your state added a medical endorsement to your adult-use license mid-2024, your relief eligibility starts then, not earlier.

Mistake #5: Relying on transaction-level certification you don’t have. If your POS does not record medical-purpose certification today, retrospective claims for periods before you started recording will be harder. Start recording now and start the clock.

How the OTC Therapeutic Endorsement model improves the 280E position

If your state has not yet adopted the OTC Therapeutic Cannabis Endorsement model — universal medical endorsement on every cannabis license, plus adult self-certification 21+ — your operators are leaving 280E relief on the table on every adult-use sale. The Endorsement model converts every transaction into a state medical marijuana license sale, which captures it inside the Schedule III channel for federal purposes.

Adult-use-only states are the loudest example. Operators in those states should be lobbying their state cannabis committee right now to convert. We have drafted the model legislation — see The OTC Therapeutic Cannabis Endorsement Model Act for the architecture. Send it to your state senator’s policy director.

280E retrospective relief FAQ

Does Schedule III rescheduling automatically eliminate § 280E?

For state medical marijuana licensee covered activity, the textual argument is that § 280E never applied to Schedule III in the first place — § 280E reads “Schedule I and II” — so Schedule III treatment removes the statutory predicate for disallowance. But this is not self-executing. You take the position on your return, you build the file, you file protective claims for open years, and you wait for Treasury’s formal guidance.

How far back can I claim retrospective relief?

Statutes of limitations limit you to generally three years from filing date or two years from payment, whichever is later. For most operators that means 2022 and 2023 are the practical earliest open years today. File protective claims to preserve those years before they close.

Will IRS actually pay refunds?

Treasury / IRS signaled retrospective relief is on the table, but no formal guidance has issued. Possible outcomes range from full retrospective refunds to forward-only relief to mixed-allocation rules that give back partial relief. Protective claims preserve all scenarios.

What if my state is adult-use-only?

Adult-use sales without a state medical marijuana license probably don’t qualify for 280E relief. Either lobby your state to adopt the OTC Therapeutic Endorsement model, or work with us to map which (if any) of your activity might qualify under a narrower theory.

Do I need new POS software to track this?

Probably yes. At minimum, your POS needs to tag transactions by medical / non-medical category, capture self-certification IDs (if applicable), and produce allocation reports. The Operator Readiness Review covers this — see CTA below.

Get the 280E retrospective relief playbook

We built the CPA / Tax Counsel 280E Package specifically for this moment. It includes a covered-activity analysis, a retrospective-relief record review, an allocation memo customized to your operations, and a protective-claim strategy that works in any Treasury guidance scenario.

If you are a CPA serving cannabis clients, we will work with you. If you are an operator without specialized tax counsel, we will work directly. Book a 280E strategy call and we’ll route you to the right place.

For the bigger picture on what changed and what’s next, see our complete Schedule III cannabis hub.

• Medical Marijuana Rescheduling — DOJ Final Order Explained (Cluster 1)
• Cannabis Banking After Schedule III (Cluster 3)
• Schedule III Cannabis Investor Disclosure & Risk Factors (Cluster 9)
• Cannabis Consulting at collateralbase.com — operator readiness for the 280E position
• DOJ Final Order
• Treasury Press Release 4/23/2026
• Article (primary)
• FAQPage (the 5 Q&As above)

Schedule III Cannabis · IRC 280E · Cannabis Laws

280E · 280E retrospective relief · Schedule III · IRC 280E · cannabis tax · Treasury IRS guidance · state medical marijuana license · cannabis CPA