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. The next day, Treasury and the IRS said they plan to issue guidance, including on apportionment and a transition rule. The order separately encourages Treasury to consider retrospective relief. In a July 2026 Tax Court brief, the IRS said neither Treasury nor the IRS takes the position that retrospective relief for prior years is appropriate.

Whether any retrospective relief comes is unresolved. This post explains what changed, what’s still open, and what operators and CPAs should be reviewing.

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 a state medical marijuana licensee a textual argument that 280E does not apply going forward. The Final Order says state licensees “will no longer be subject to the deduction disallowance,” and it also says “[n]othing in this rule constitutes a determination regarding federal tax liability.”

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.

What supports retrospective relief, and what cuts against it

Three points:

1. DOJ invited it. The Final Order’s preamble says that “state licensees will no longer be subject to the deduction disallowance imposed by Section 280E” and encourages 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. The IRS has pushed back. In a July 2026 Tax Court brief, it said neither Treasury nor the IRS takes the position that retrospective relief for prior years is appropriate.

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. Whether a protective claim makes sense in your case is a question for your tax adviser.

7 critical steps to review with your tax adviser

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

The Schedule III listing covers marijuana “subject to a state medical marijuana license.” What that takes for your activity is part of the dispute, so the license records come first. 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: the argument is generally stronger from that date forward, and suppliers’ licenses alone won’t carry earlier periods. If that date fell in 2026, Treasury’s announced (not yet issued) transition rule may reach back to January 1, 2026.

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

Treasury’s April 23 press release mentioned mixed-business apportionment. That may mean segmenting revenue. Because the government and taxpayers read the listing differently, keep records that work under either reading, separating:

• Medical-channel sales: sales to patients and other certified purchasers, with the medical endorsement / patient certification / OTC therapeutic certification documented
• Sales to adults of marijuana covered by a medical license, with the transfer record and license status for each package, kept apart from ancillary sales, accessories, hemp-derived products and non-cannabis revenue, which aren’t covered under any reading

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 — Ask about 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, a refund deadline could pass. Ask your tax adviser whether a protective refund claim makes sense for you. A protective claim doesn’t create a right to a refund.

Step 5 — Update current-year tax positions

For taxable years 2026 forward — meaning, for the return you file in early 2027 — decide with your tax adviser whether to take a 280E position on the original return, on what facts, and how to disclose it. Form 8275 (Disclosure Statement) is the usual route for a position that isn’t contrary to a regulation. Adequate disclosure can help against accuracy-related penalties if the IRS later disagrees, but it isn’t a guarantee.

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: Letting a refund deadline pass without asking your tax adviser about it. Statutes of limitations don’t wait for guidance.

Mistake #2: Treating all cannabis activity as covered. The Final Order covers marijuana “subject to a state medical marijuana license.” 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, that date will matter to how strong your position is.

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

The OTC Therapeutic Cannabis Endorsement model — universal medical endorsement on every cannabis license, plus adult self-certification 21+ — is a state-law proposal aimed at strengthening license coverage across a state’s market. No court has ruled on whether it would change the federal schedule or the 280E result, and DEA’s October 2026 order to show cause, which isn’t final, attacks a similar dual-purpose license.

Operators who support the model can raise it with their state cannabis committee. 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. Whether to take a position, and how, is a decision for you and your tax adviser, and Treasury’s formal guidance is still pending.

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. Ask your tax adviser about those years before they close.

Will IRS actually pay refunds?

Don’t assume so. In a July 2026 Tax Court brief, the IRS said neither Treasury nor the IRS takes the position that retrospective relief for prior years is appropriate, and no formal guidance has issued.

What if my state is adult-use-only?

Without a medical license of your own, the argument for 280E relief is weak, and suppliers’ medical licenses don’t change that on their own. Talk to your tax adviser about what your licenses and records can support.

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 review of protective-claim questions. No result is promised.

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