Does 280E Still Apply in 2026? Medical vs. Adult-Use Cannabis After Schedule III

Does 280E Still Apply in 2026?

Short answer: for most Illinois cannabis activity, assume it still does, and treat any different position as something that has to be established on the facts of a specific business and a specific tax period rather than assumed from a headline.

Here is what actually changed. On April 23, 2026 the Department of Justice and DEA issued a final order placing FDA-approved products containing marijuana, and products containing marijuana that are subject to a qualifying state-issued medical license, into Schedule III of the Controlled Substances Act. The broader proposal to move marijuana generally from Schedule I to Schedule III did not become final at the same time; it remained in rulemaking, with a notice of hearing issued on April 28, 2026.

Section 280E reaches trades or businesses trafficking in controlled substances within Schedule I or Schedule II. That is the hinge. Where activity is genuinely outside Schedules I and II for a period, the statutory predicate for 280E is not met for that activity. Where it is not — which includes adult-use activity while the broader rescheduling remains unfinished — the provision continues to operate exactly as it did before.

What has not happened is the part that matters most for filing. As of this writing, Treasury and the IRS have not issued guidance addressing how the order interacts with Section 280E in practice: how a mixed medical and adult-use business divides its expenses, what documentation supports that division, how a period that straddles an effective date is handled, or how state licensing categories map to the federal question. Those points are unresolved. This guide says so plainly rather than filling the gap with a formula that no authority has blessed.

The practical posture for an Illinois operator in 2026 is therefore not "280E is over." It is: know which of your activities the question could turn on, and make sure your accounting can separate them with evidence, whichever way guidance eventually lands.

• Established: 280E applies to trades or businesses trafficking in Schedule I or Schedule II controlled substances
• Changed: an April 2026 final order placed FDA-approved marijuana products and products under a qualifying state medical license in Schedule III
• Not final: the broader Schedule I to Schedule III move for marijuana generally remained in rulemaking
• Unresolved: Treasury and IRS treatment, allocation between medical and adult-use activity, transition mechanics and documentation standards
• Actionable now: accounting that can segregate activity, cost and inventory with contemporaneous records

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Medical vs. Adult-Use Cannabis: Why the Difference Matters for 280E

Before 2026, the medical / adult-use distinction was largely a state matter in Illinois: different registration, different tax treatment at the register, different patient rules. Federally it made no difference — everything sat in Schedule I and 280E applied across the board. The 2026 order is the first time that state medical licensure has been written into a federal scheduling determination in a way that could change the answer for one part of a business and not another.

Illinois is unusually exposed to that split. The Compassionate Use of Medical Cannabis Program and the Cannabis Regulation and Tax Act coexist, and a large share of Illinois dispensing organizations serve registered qualifying patients and adult-use customers from the same premises, the same inventory rooms and often the same staff. Cultivation centers, craft growers and infusers likewise supply product that ends up in both channels, sometimes from the same harvest batch.

That means the federal question is no longer a single yes or no at the entity level. It can become a question about activity, product and license category inside one business — and the only thing that can answer a question like that is the accounting record.

Two operators with the same revenue and the same margins can end up in very different positions purely because one can show which sales, which inventory and which labor hours related to which channel, and the other cannot. Nothing in the 2026 order changes the burden of substantiation. If anything it raises it, because the taxpayer is now the party asserting that some portion of its activity should be treated differently.

There is also a timing dimension that operators consistently underestimate. The scheduling posture during a tax period governs that period. A business filing for a period that began before the order and continued after it is describing a year in which the federal facts changed partway through. Cutting that record cleanly after the fact is difficult; capturing it as it happens is not.

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The Mixed-Use Cannabis Accounting Problem

Consider a hypothetical Illinois dispensing organization in the Chicago area holding both a medical dispensing license and adult-use authority at one address. It runs one POS with two transaction paths, one vault, one BioTrack account, one payroll, one lease, one security contract and one bookkeeper. Roughly a fifth of its unit volume is medical registry sales; the rest is adult-use. Nothing in that setup is unusual, and almost none of it is currently structured to answer a federal question that assumes the two channels can be told apart.

Work through the layers. Revenue is the easy one — the POS already distinguishes registry sales, because Illinois taxes them differently and requires card verification. That data exists, but it usually lands in the general ledger as a single deposit or a single daily sales journal entry. Splitting revenue is a mapping exercise, not a reconstruction, and it is the first thing to fix.

Inventory is harder. Product moves from the same room to both channels. Unless purchase receipts, transfers and sales are tracked at a level that lets cost follow the unit into the channel where it was sold, cost of goods sold cannot be attributed with any confidence. This is a track-and-trace and subledger problem before it is a tax problem, and it is why reconciliation between BioTrack, the POS and the accounting records is the foundation for everything above it.

Direct expenses split reasonably well: product purchases, excise borne on specific channels, packaging tied to a channel, staff whose entire role is patient services. Indirect and shared costs are where the difficulty concentrates — rent on shared floor space, the general manager's salary, utilities, security guarding one building, POS and seed-to-sale subscriptions, insurance, accounting and legal fees, delivery vehicles, cleaning, banking costs.

Payroll deserves separate attention because it is usually the largest shared cost and the one with the best available evidence. A budtender who serves both patients and adult-use customers is a shared cost by default, but scheduling systems, POS operator IDs on each transaction, and time tracking coded by function can convert a guess into a record. Operators who wait for guidance to tell them how to allocate payroll will not have the underlying data to apply it.

The documentation point runs through all of it. Records created in the ordinary course of business at the time of the transaction carry weight. Spreadsheets built at filing time to reach a preferred percentage do not, and a methodology that changes each year in the direction of a lower liability is a pattern rather than a method.

One thing this guide will not do is hand you an allocation formula. No IRS or Treasury guidance currently prescribes a method for dividing shared expenses between medical and adult-use cannabis activity for 280E purposes, and any percentage presented as approved would be invented. What can be built now is the evidence layer that any future method will need: segmented revenue, channel-aware inventory, function-coded labor, and a written, dated policy explaining how shared costs are tracked and why.

• Revenue segmented at the POS and carried into the general ledger, not merged at deposit
• Departments, classes or locations in the accounting system that mirror actual operating channels
• Chart of accounts that separates production, retail, occupancy and administrative activity
• Inventory subledger where cost can follow product into the channel of sale
• Payroll coded by function and location, supported by schedules and POS operator data
• Shared costs identified as shared, with a written policy describing how they are captured
• BioTrack, POS and ledger reconciliations retained for each period
• Contemporaneous documentation rather than filing-season reconstruction

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Cannabis 280E Expense Allocation and Apportionment

Allocation is the technical heart of the 2026 question. If some activity of a business could fall outside 280E while other activity does not, then every dollar of shared cost sits on a line that someone has to draw — and the taxpayer draws it first, with the records available.

The categories that matter are predictable. Rent and occupancy on space used by both channels. Payroll for staff who serve both. Management and executive compensation. Security services covering a whole facility. Utilities on a single meter. Software licences for POS, seed-to-sale, accounting and payroll. Insurance. Professional services. Shared production or storage areas in a vertically integrated operation. Marketing, which in Illinois is heavily restricted but still incurred.

There is a difference worth keeping straight between allocation of a shared cost between activities and the separate question of what is inventoriable under the inventory and cost-accounting rules. The second question does not disappear when scheduling changes, and for producers it remains the larger driver of the number on the return. A cultivation center's indirect production costs are analyzed under the inventory rules whether or not 280E applies to a given channel.

The defensible approach available today is method plus evidence. Choose a basis for each shared cost that reflects how the cost is actually consumed — square footage for occupancy, hours or transaction counts for labor, units or revenue for costs that genuinely scale that way — write it down, apply it consistently, and keep the underlying data that produced each number. A basis you can reproduce from source records two years later is worth considerably more than a more favorable basis you cannot.

None of this promises deductibility. Whether a given allocation produces a deduction depends on federal law and guidance applying to the period and the facts of the business, and that is precisely the part that has not been resolved. What allocation discipline does provide is optionality: a business with clean segmented records can implement whatever methodology guidance eventually requires, including retroactively for open periods, while a business without them may be unable to substantiate any position at all.

• Occupancy: square footage and use of space, supported by floor plans and the lease
• Labor: hours, roles and POS operator activity rather than a flat percentage
• Management and administration: documented time or activity basis, applied consistently
• Security, utilities and insurance: facility-level costs with a stated, reproducible basis
• Software and subscriptions: allocated on user, function or transaction data
• Professional services: engagement scope where it is genuinely channel-specific
• Every basis written down, dated, and supported by the data behind it

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Chart of Accounts After Schedule III

A cannabis chart of accounts built when every dollar sat under 280E was designed to answer one question: what is inventoriable and what is not. A chart of accounts for 2026 has to answer that question and a second one — which activity did this belong to — without forcing anyone to re-cut the year by hand.

In practice that means dimensions, not just accounts. Most systems Illinois operators use already support classes, departments, locations or tags. Using them properly is cheaper and far more durable than creating parallel accounts for every combination, and it keeps financial statements readable for lenders and boards.

Revenue should distinguish medical registry sales from adult-use sales at the point the transaction enters the ledger, with the Illinois tax treatment of each channel recorded alongside rather than netted into one figure. Cost of goods sold should mirror that structure, so gross profit can be read by channel without an offline schedule.

Below the gross profit line, keep the traditional 280E discipline: production versus retail versus occupancy versus administrative, with direct costs separated from shared costs at the account level. Shared cost accounts should be visibly shared — named as such — so nobody downstream mistakes an allocated figure for a direct one.

Then the supporting layer, which is where most operators are thinnest: monthly reconciliations between BioTrack, the POS and the ledger; inventory rollforwards; payroll allocation workpapers; and a written accounting policy memo describing the structure and any changes to it. That memo is the document that explains, years later, why the books look the way they do.

Restructuring a chart of accounts mid-year is disruptive, so most Illinois operators are best served doing it at a clean period boundary, mapping prior periods forward where possible, and documenting the change rather than quietly overwriting history.

• Medical and adult-use revenue distinguishable at entry, not at year end
• COGS structured to mirror the revenue split
• Direct versus shared cost accounts, with shared accounts labelled as shared
• Departments, classes and locations used as dimensions instead of duplicated accounts
• Inventory rollforwards and reconciliations retained monthly
• A written, dated accounting policy memo covering structure and changes

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Inventory and COGS Still Matter

There is a persistent hope that a scheduling change makes inventory accounting less important. The opposite is closer to the truth. Cost of goods sold is not a deduction — it is part of computing gross income from the sale of goods — which is why it survived 280E in the first place, and why it remains central regardless of how the scheduling question resolves.

For Illinois producers, the inventory rules continue to drive the outcome. A cultivation center, craft grower or infuser capitalizes direct materials, direct labor and allocable indirect production costs. A dispensing organization as a reseller works from invoice cost plus acquisition costs. Vertically integrated groups have to maintain that functional separation internally, and the 7% Cultivation Privilege Tax makes intercompany transfer pricing between an Illinois cultivation center and an affiliated dispensary a document with tax consequences on both sides.

In a mixed medical and adult-use environment, inventory also becomes the mechanism that makes channel attribution credible. If the subledger tracks product from receipt through transfer to sale, cost of goods sold by channel falls out of the system. If it does not, any channel-level gross profit figure is an estimate, and estimates are the first thing challenged in an examination.

The unglamorous work is the work: periodic physical counts, variance investigation with written explanations, reconciliation of BioTrack quantities to POS movement to ledger balances, documented waste and adjustments, and a costing method applied the same way every period. None of this changes because of a federal order.

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Documentation and Audit Defense

A changing federal tax environment makes clean accounting more important, not less. Periods of transition produce inconsistent positions across an industry, and inconsistent positions attract examination. The businesses that come through comfortably are the ones whose records were built while the transactions were happening.

The file that holds up is boring and complete: POS reports reconciled to deposits, BioTrack reports reconciled to the inventory subledger, purchase invoices and receiving records, payroll registers with function and location coding, time and schedule data, the lease and a floor plan supporting occupancy allocation, inventory count sheets with variance notes, allocation workpapers showing the basis and the underlying data, a written accounting policy, and book-to-tax reconciliations retained with each return.

Two habits do more damage than any single missing document. The first is reconstructing a prior year at filing time to reach a preferred number. The second is changing methodology annually without documenting why. Both convert a factual question into a credibility question.

Where a position depends on how a business is licensed or structured under Illinois law, that is a legal question, and the sensible pattern is for the accounting to record the facts and for counsel to opine on the law. Records that state what happened are useful to every adviser in the room; records that assume a conclusion are useful to none of them.

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What Illinois Cannabis Businesses Should Do Now

The correct response to an unresolved federal question is preparation, not repositioning. Nothing below requires taking a tax position, and all of it has value whether guidance narrows 280E further, clarifies it, or leaves the current posture in place for some time.

Start with segmentation, because it is the longest lead item. Confirm that medical registry sales and adult-use sales are distinguishable in the POS, that the distinction survives the export into the accounting system, and that cost of goods sold can be read the same way. For most Illinois dispensing organizations this is a configuration and mapping project measured in weeks.

Then inventory. Get BioTrack, the POS and the ledger reconciling monthly with variances explained in writing, and make sure physical counts are being performed and documented. Illinois operators with cultivation or infusing activity should confirm that production costs are being captured against batches rather than expensed to the period.

Then labor. Decide how time is going to be evidenced — scheduling exports, POS operator IDs, time coding by function and location — and start capturing it now. Retroactive labor allocation is the weakest workpaper in any file.

Then shared costs. List them, assign a basis to each, write the basis down with the reason, and keep the source data. A short policy memo dated this year is worth more than a long one written after a notice arrives.

Finally, keep the state layer straight, because it is separate from all of this and does not move with federal scheduling. Illinois excise and Retailers' Occupation Tax obligations, potency-tier classification for adult-use sales, the 1% rate applying to medical registry sales, the 7% Cultivation Privilege Tax and IDFPR and Illinois Department of Revenue filing requirements continue on their own timetable. Illinois also allows a state subtraction for expenses that Section 280E disallows federally, which means the federal and Illinois returns already diverge and that divergence has to be scheduled each year — confirm current-year mechanics with your tax adviser rather than assuming last year's treatment.

Operators who complete that list are positioned to implement future Treasury or IRS guidance quickly, including for open periods, instead of discovering that the data required to apply it was never captured.

• Segment medical and adult-use revenue and COGS end to end
• Reconcile BioTrack, POS and ledger monthly, with written variance explanations
• Capture labor by function and location starting now
• Document shared-cost bases in a dated policy memo
• Keep batch-level production costs for cultivation and infusing activity
• Preserve source documentation rather than summaries
• Keep Illinois excise, ROT, potency-tier and Cultivation Privilege Tax compliance current
• Track federal developments without filing as though they are already effective

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Questions Illinois Cannabis Operators Should Ask Their CPA

The value of these questions is diagnostic. If your adviser can answer each one from your existing records without a project, your accounting is already in reasonable shape for whatever comes next. If several answers begin with an estimate, you have your work list.

• Does Section 280E currently apply to all of our activity, and what facts is that conclusion based on?
• Can our accounting system distinguish medical registry activity from adult-use activity today, end to end?
• How are shared expenses tracked right now, and is the basis written down anywhere?
• Is payroll coded by actual function and location, or allocated by estimate after the fact?
• Can inventory and cost of goods sold be substantiated from source records for each channel?
• Do BioTrack, the POS and the accounting records reconcile every month, with variances explained?
• What documentation supports our current accounting treatment if it is examined?
• Which parts of our federal position are settled, and which depend on guidance that does not exist yet?
• What accounting changes would be required if Treasury or the IRS issues allocation guidance mid-year?
• How are the Illinois state modification and our excise and ROT filings interacting with the federal position?

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