IRC § 280E Cannabis Expense Disallowance Calculator

How this calculator works

IRC § 280E is a one-sentence statute that does almost all the federal tax damage to the cannabis industry. Enacted in 1982, it reads, in operative part: "No deduction or credit shall be allowed 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 (within the meaning of schedule I and II of the Controlled Substances Act) which is prohibited by Federal law or the law of any State in which such trade or business is conducted." Cannabis remains a Schedule I controlled substance under federal law as of 2026. The statute's "or" is disjunctive — federal prohibition alone is sufficient to trigger the disallowance even when the operator is fully compliant with state cannabis regulation.

The practical effect is that a state-legal cannabis cultivator, processor, distributor, or retailer pays federal income tax on revenue minus cost of goods sold (COGS) rather than on revenue minus all expenses. Because retailers in particular have very narrow COGS scope, effective federal income tax rates routinely run 50% to 90% of accounting net income, and pass-through structures regularly produce effective rates above 100%. This calculator surfaces the § 280E disallowance, the § 471 COGS carve-out, the CHAMP separate-trade-or-business allocation, and both effective-rate framings in a single planning view.

How § 280E came to be

The statute was a direct legislative response to a 1981 Tax Court decision. In Edmondson v. Commissioner, 42 T.C.M. 1533 (1981), the Tax Court ruled that a self-employed drug dealer — Mr. Edmondson sold cocaine, amphetamines, and cannabis — was entitled to deduct his ordinary and necessary business expenses under IRC § 162: telephone, rent, packaging, scales, mileage on the car he used to make deliveries, and an allocable share of the apartment he used as a home office. The Service had argued for public-policy disallowance; the court declined. Congress reacted within a year by enacting § 280E as part of the Tax Equity and Fiscal Responsibility Act of 1982, which surgically denied the § 162 deduction (and any other deduction or credit) for Schedule I and II trafficking trades or businesses.

The statute was aimed at the underground drug economy. It was not contemplating state-legal cannabis. But the statute's text reaches state-legal cannabis precisely because federal law has not removed cannabis from Schedule I — and the courts have refused to read an implicit state-legality carve-out into a statute that explicitly mentions state-illegality as one of two sufficient triggers.

The § 471 cost-of-goods-sold carve-out

§ 280E disallows deductions. Cost of goods sold is not a deduction. Under IRC § 61(a)(2), gross income from a business equals gross receipts minus cost of goods sold — COGS is subtracted to arrive at gross income, not after gross income to arrive at taxable income. COGS is structurally a return of capital, a basis reduction, not a § 162 expense. The Tax Court has consistently held that § 280E does not reach COGS because § 280E reaches "deductions" and COGS is not one.

This is the single structural relief available to a cannabis taxpayer. Every cannabis tax planning conversation runs through one question: what costs can I get into COGS under IRC § 471?

The answer depends on whether the taxpayer is a producer (cultivator) or a reseller (retailer/dispensary).

Cultivator / producer scope (broad)

Under the pre-1986 inventory rules incorporated by IRC § 471(a), a producer uses the full-absorption inventory method under Treas. Reg. § 1.471-3(c) and § 1.471-11. The producer's inventoriable costs include:

• Direct material — seeds, clones, growing media, nutrients, water.
• Direct labor — cultivation staff, trimmers, harvest crew, drying-and-curing labor.
• Allocable indirect production costs — cultivation-room electricity, the allocable share of rent for cultivation space, depreciation on cultivation equipment (lights, HVAC, irrigation), indirect production labor (cultivation managers, supervisors), quality control, security tied to the production area, and an allocable share of property tax.

A vertically-integrated operator that also processes (extraction, edibles manufacturing, packaging) and that segregates those functions on its books can capitalize processing and packaging costs into finished-goods inventory by the same logic. The breadth of the producer scope is the structural reason cultivators consistently fare better under § 280E than retailers do.

Retailer / reseller scope (narrow)

Under Treas. Reg. § 1.471-3(b), a reseller's inventoriable cost is limited to "the invoice price less trade or other discounts, … plus transportation or other necessary charges incurred in acquiring possession of the goods." A dispensary that buys finished product from a wholesaler can put into COGS:

• The wholesale invoice cost of the merchandise, net of trade discounts.
• Inbound freight and other necessary charges incurred to acquire possession.

That is it. The budtender's wages, the storefront rent, the point-of-sale system, retail security, marketing, professional fees, software, insurance, and management salaries are ALL § 162 operating expenses fully disallowed under § 280E with no COGS path.

The Harborside holding — § 263A does not expand the carve-out

For several years after CHAMP, aggressive cannabis tax advisors argued that IRC § 263A (the uniform capitalization rules — "UNICAP") could be used to capitalize indirect costs into inventory beyond what § 471 alone would allow. The theory: § 263A capitalizes amounts that would otherwise be § 162 deductions; § 280E only disallows deductions; therefore § 263A should expand the COGS carve-out by recharacterizing § 162 amounts as inventory cost.

The Tax Court rejected this argument decisively in Patients Mutual Assistance Collective Corp. v. Commissioner (Harborside), 151 T.C. 176 (2018), affirmed by the Ninth Circuit at 995 F.3d 740 (2021). The court held that § 280E disallows deductions beyond those allowed by § 471, period. § 263A merely capitalizes deductions; it does not retroactively recharacterize them as inventory cost under § 471. After Harborside, a cannabis reseller is stuck with the narrow § 471(b) reseller scope, and § 263A's broader capitalization rules are unavailable as a workaround.

The Harborside holding is the reason this calculator's COGS-scope warning fires when a retailer reports COGS above roughly 70% of revenue — that ratio implies the operator is putting more than invoice cost and inbound freight into COGS, which Harborside forecloses.

The CHAMP allocation — separate non-trafficking trade or business

The other structural carve-out comes from Californians Helping to Alleviate Medical Problems (CHAMP) v. Commissioner, 128 T.C. 173 (2007). CHAMP operated a medical-cannabis dispensary in California and, separately, provided caregiving services to its patient-members: counseling, support groups, hygiene supplies, daily lunches, and other welfare services. The Service argued that CHAMP's entire operation was one § 280E trafficking trade or business and that all expenses were disallowed.

The Tax Court disagreed. It found that CHAMP operated two distinct trades or businesses: a cannabis dispensary (trafficking, § 280E-disallowed) and a caregiving service (non-trafficking, § 162-deductible). The caregiving service had its own staff, its own services, and a substantial share of patient-members participating in caregiving without buying cannabis on that visit. Expenses fairly allocable to the caregiving side — staff wages, supplies, the allocable share of rent based on relative space and time — became deductible § 162 expenses. The dispensary side remained fully § 280E-disallowed.

CHAMP is the standard cannabis-industry vehicle for getting any operating expenses below the § 280E line. Operators with a vertically-integrated cultivation-plus-retail structure, with a separate consulting or education business, or with a real-estate holding entity that leases to the dispensary, all rely on CHAMP-style allocations.

The Olive limitation

Olive v. Commissioner, 139 T.C. 19 (2012), affirmed by the Ninth Circuit at 792 F.3d 1146 (2015), narrowed CHAMP sharply. The Vapor Room in San Francisco operated a medical-cannabis dispensary AND offered free yoga, free massage, free movies, on-site vaporizer use, and a community gathering space. The taxpayer argued these amenities were a separate non-trafficking caregiving trade or business under CHAMP and that the allocable expenses should be deductible.

The Tax Court rejected the argument. The amenities were free; they generated no revenue; they were not a stand-alone business; they were marketing for the cannabis dispensary. The entire operation was one trafficking trade or business, and ALL operating expenses were § 280E-disallowed.

The CHAMP-vs-Olive line is now well-defined. To support a CHAMP allocation that will survive examination, the second activity must have:

• Its own revenue — the activity must generate income separate from cannabis sales.
• Its own books — separate income statements, separate expense ledgers, separate accounting.
• Its own staff — staff dedicated to the non-cannabis activity, not budtenders moonlighting.
• Its own customers — patrons who participate in the non-cannabis activity without necessarily buying cannabis on that visit.

Bare complimentary amenities (free yoga, free movies, complimentary coffee, free vaporizer use) do NOT qualify. Marketing dressed up as a caregiving service does NOT qualify. The IRS has been aggressive on this and the Tax Court has consistently sided with the Service in post-Olive cases.

Why retailers fare worse than cultivators

The COGS-scope asymmetry between § 1.471-11 (full absorption for producers) and § 1.471-3(b) (invoice cost plus inbound freight for resellers) means cultivators capture a much larger share of their operating costs as COGS. A cultivator can put cultivation electricity, cultivation rent, cultivation labor, cultivation equipment depreciation, and indirect production overhead into inventory and flow it through COGS when the crop is sold. A retailer can put only the wholesale invoice and inbound freight into COGS — everything else is § 280E-disallowed.

The same accounting net income produces very different federal tax bills depending on which side of the supply chain the operator sits on. The vertically-integrated operator that performs both cultivation and retail under one roof can apportion costs between the two functions and capture the cultivator scope on the cultivation portion — provided it maintains separate books for each function and apportions on a defensible basis.

Worked example 1 — retailer baseline (Harborside-shape)

A state-legal C-corp dispensary reports the following:

• Gross revenue: $10,000,000
• § 471 COGS: $4,000,000 (wholesale invoice cost plus inbound freight)
• Operating expenses: $4,000,000 (storefront rent, payroll, security, marketing, software)

Under § 280E, the dispensary cannot deduct any of the $4,000,000 of operating expenses. Its computation:

• Trafficking gross profit: $10,000,000 − $4,000,000 = $6,000,000
• § 280E-disallowed expenses: $4,000,000
• Federal taxable income: $6,000,000
• Federal income tax at 21% C-corp rate: 21% × $6,000,000 = $1,260,000
• Accounting net income: $10,000,000 − $4,000,000 − $4,000,000 = $2,000,000
• Effective federal rate on accounting net income: $1,260,000 / $2,000,000 = 63%

A non-cannabis C-corporation with the same gross profit and operating expenses would owe 21% × $2,000,000 = $420,000 — a third of what the dispensary owes. The $840,000 difference is the cost of § 280E.

Worked example 2 — cultivator using full absorption

A vertically-integrated C-corp cultivator-distributor reports the same $10,000,000 of revenue. Because it grows the product itself, it can capitalize a much larger share of its costs into COGS under Treas. Reg. § 1.471-11. Its cost stack:

• Direct material (seeds, clones, growing media): $500,000
• Direct labor (cultivation staff, trimmers, harvest): $2,500,000
• Indirect production costs (cultivation electricity, rent allocable to cultivation, depreciation on cultivation equipment, indirect supervisory labor, quality control, production security): $3,500,000
• § 471 COGS (sum of the above): $6,500,000
• Operating expenses (admin, sales, distribution OPEX not allocable to production): $1,500,000

The cultivator's computation:

• Trafficking gross profit: $10,000,000 − $6,500,000 = $3,500,000
• § 280E-disallowed expenses: $1,500,000
• Federal taxable income: $3,500,000
• Federal income tax at 21% C-corp rate: 21% × $3,500,000 = $735,000
• Accounting net income: $10,000,000 − $6,500,000 − $1,500,000 = $2,000,000
• Effective federal rate on accounting net income: $735,000 / $2,000,000 = 36.75%

Same revenue and same accounting net income as the retailer in Example 1, but the federal tax bill is $525,000 lower because the cultivator captured more of its costs as COGS. This is the structural reason most cannabis investment flowing into the supply chain in the past decade has favored cultivation and vertical integration over pure-retail dispensary operations.

Worked example 3 — CHAMP allocation reduces the disallowance

A state-legal dispensary also runs a genuinely separate caregiving service that has its own revenue, books, and staff. $2,500,000 of its $10,000,000 of revenue (25%) is non-cannabis caregiving revenue. The operating expenses are still $4,000,000.

A CHAMP allocation at 25% (allocating expenses on the same basis as revenue, as a planning proxy — the actual allocation should be done line-by-line on relative use):

• Trafficking revenue: $10,000,000 × 75% = $7,500,000
• Non-trafficking revenue: $10,000,000 × 25% = $2,500,000
• § 471 COGS: $4,000,000 (still attributed to the trafficking activity)
• Trafficking gross profit: $7,500,000 − $4,000,000 = $3,500,000
• CHAMP-allocated operating expenses (§ 162 deductible): $4,000,000 × 25% = $1,000,000
• § 280E-disallowed operating expenses: $4,000,000 × 75% = $3,000,000
• Non-trafficking net income: $2,500,000 − $1,000,000 = $1,500,000
• Federal taxable income: $3,500,000 + $1,500,000 = $5,000,000
• Federal income tax at 21%: $1,050,000

CHAMP saves the operator $210,000 of federal tax ($1,260,000 baseline minus $1,050,000 with CHAMP) — and would save more if the operating expense allocation skewed more heavily toward the non-trafficking side (e.g., the caregiving service had its own dedicated staff, supplies, and space). The CHAMP-vs-Olive analysis MUST support the allocation: separate revenue, separate books, separate staff, separate customers.

Worked example 4 — pass-through retailer at 37%

The same retailer as Example 1 but structured as a pass-through (LLC taxed as a partnership, or an S-corp), and the owner is in the top 37% federal individual bracket:

• Trafficking gross profit: $6,000,000
• Federal taxable income (passing through to the owner): $6,000,000
• Federal income tax at 37%: 37% × $6,000,000 = $2,220,000
• Accounting net income: $2,000,000
• Effective federal rate on accounting net income: $2,220,000 / $2,000,000 = 111%

The pass-through owner owes more in federal income tax than the business actually earned on its books. This is the structural reason cannabis operators at scale almost universally use C-corporation structures despite the double-tax cost on distributions — the C-corp's 21% rate is fixed and the second layer of dividend or capital-gain tax can be deferred indefinitely by retaining and reinvesting earnings, while a pass-through owner is hit with the top marginal rate on every dollar of § 280E-disallowed gross profit every year.

The IRC § 199A QBI deduction does not help

IRC § 199A allows non-corporate owners of qualified pass-through businesses to deduct up to 20% of qualified business income (QBI). The deduction does NOT help a cannabis pass-through. The reason: § 199A computes the 20% deduction on QBI, which is the net income from the qualified trade or business. A cannabis trafficking trade or business has very little (or zero, or negative) QBI after § 280E disallows all § 162 expenses — there is nothing for the 20% deduction to bite on. And § 280E itself disallows the § 199A deduction because § 280E disallows ALL deductions for the trafficking trade or business, full stop.

The QBI deduction is therefore irrelevant to a cannabis pass-through. The only path to lower effective rates is the COGS scope (maximize § 471 inclusion) and the CHAMP allocation (peel non-trafficking activities off into a separate § 162 business).

State income tax decoupling

Federal § 280E does not control state income tax. Each state decides for itself whether to conform to § 280E or to decouple from it. As of 2026, the following states have decoupled their state income tax from § 280E (either by statute or by regulation) and allow ordinary § 162 deductions for state income tax purposes even though the federal disallowance still applies: California, Colorado, Oregon, Massachusetts, New York, New Jersey, Illinois, Michigan, Nevada, and several others. Other states piggyback on federal taxable income (a common starting point for state income tax computations) and effectively replicate § 280E at the state level — a cannabis operator in such a state is doubly stung.

State excise taxes on cannabis (California's is 15% of retail price; Washington's is 37%; Oregon's is 17%) and municipal cannabis taxes (commonly 5% to 10% on top of state excise) are an entirely separate burden. The cumulative effective tax burden on a state-legal dispensary — federal income tax driven by § 280E, state income tax, state excise tax, municipal cannabis tax, payroll tax, sales tax — routinely exceeds 80% of accounting net income. This calculator surfaces only the federal income tax layer.

Form 8275 disclosure

A cannabis taxpayer taking an aggressive § 280E position should consider filing Form 8275 (Disclosure Statement) alongside the return to disclose the position and avoid the substantial-understatement portion of the IRC § 6662 accuracy-related penalty. Form 8275 disclosure establishes a "reasonable basis" for the position even if the position lacks substantial authority. Common aggressive positions warranting Form 8275 consideration:

• A vertically-integrated retailer arguing its retail floor is part of the production process and therefore eligible for § 471(a) full absorption rather than the narrower § 1.471-3(b) reseller scope.
• A broad CHAMP allocation to a non-trafficking activity that has minimal separate revenue (closer to Olive than to CHAMP on the facts).
• Any § 263A capitalization theory the operator wants to preserve for appeal despite Harborside.
• The position that certain post-acquisition costs qualify as "necessary acquisition charges" under § 1.471-3(b) even though they look like post-acquisition handling.

Form 8275 does NOT protect a position that lacks any reasonable basis. Consult tax counsel before relying on disclosure as the penalty defense.

Common errors

• Ignoring the § 471 COGS carve-out entirely — leaves substantial tax savings on the table for cultivators especially. Every cannabis operator should be maximizing § 471 inclusion to the extent supported by the regulations.
• A retailer pushing storefront overhead, payroll, marketing, and depreciation into COGS — Harborside forecloses this. The position will not survive examination and may trigger a substantial-understatement penalty.
• Claiming a CHAMP allocation without separate revenue, separate books, separate staff, and separate customers — Olive forecloses this. The entire allocation will be disallowed on examination.
• Treating state legality as relevant to § 280E — it is not. Federal Schedule I status alone is sufficient to trigger the disallowance.
• Treating the IRC § 199A QBI deduction as helpful for cannabis pass-throughs — it is not, both because there is no QBI to deduct against after § 280E and because § 280E independently disallows the § 199A deduction.
• Treating cannabis ancillary businesses as subject to § 280E — testing labs, packaging companies, software vendors, and real-estate landlords leasing to dispensaries are NOT subject to § 280E because they do not "consist of trafficking" in cannabis. They are ordinary § 162 businesses.
• Misclassifying a vertically-integrated operator's processing function — apportionment between cultivation and retail must be done on a defensible basis with separate books.
• Failing to file Form 8275 alongside an aggressive position — leaving the substantial-understatement penalty exposure unmitigated.

What happens if cannabis is rescheduled

§ 280E reaches trades or businesses consisting of trafficking in a controlled substance listed in Schedule I or II of the Controlled Substances Act. If cannabis is rescheduled to Schedule III (or removed from the CSA entirely), § 280E no longer applies by its own terms. A DEA notice of proposed rulemaking to reschedule cannabis to Schedule III was issued in 2024 and has been under administrative review since then; as of this calculator's last-reviewed date (2026-05-16), the proposed rule has not been finalized and cannabis remains in Schedule I.

If and when rescheduling takes effect, the federal income tax burden on cannabis operators will collapse substantially: a state-legal dispensary that today pays effective federal rates of 50% to 90% on book income will pay the ordinary 21% C-corp rate (or the pass-through marginal rate) on net income just like any other federally-legal business. The transition will not be retroactive — pre-effective-date tax years remain subject to § 280E. The IRC § 199A QBI deduction would become available to pass-through cannabis operators once the activity ceases to be § 280E-disallowed.

Statute and case citations

• IRC § 280E — disallowance of § 162 deductions and credits for trafficking in Schedule I or II controlled substances
• IRC § 61(a)(2) — gross income from business (revenue minus COGS)
• IRC § 162 — ordinary and necessary business expenses (disallowed by § 280E for trafficking)
• IRC § 263A — UNICAP (held not to expand the § 280E COGS carve-out by Harborside)
• IRC § 471 — inventory rules (the COGS carve-out from § 280E)
• IRC § 11 — 21% C-corporation rate
• Treas. Reg. § 1.471-3(b) — reseller cost (invoice price plus inbound freight)
• Treas. Reg. § 1.471-3(c) — producer cost (raw materials plus direct labor plus production overhead)
• Treas. Reg. § 1.471-11 — full-absorption inventory method for producers
• Edmondson v. Commissioner, 42 T.C.M. 1533 (1981) — pre-§ 280E case that motivated the statute
• CHAMP v. Commissioner, 128 T.C. 173 (2007) — separate non-trafficking trade or business
• Olive v. Commissioner, 139 T.C. 19 (2012), aff'd 792 F.3d 1146 (9th Cir. 2015) — bare amenities are not a separate trade or business
• Patients Mutual Assistance Collective Corp. (Harborside) v. Commissioner, 151 T.C. 176 (2018), aff'd 995 F.3d 740 (9th Cir. 2021) — § 263A does not expand the § 280E COGS carve-out
• Form 8275 — Disclosure Statement for aggressive positions under IRC § 6662
• Controlled Substances Act, 21 U.S.C. § 812 — cannabis listed in Schedule I as of 2026

Important caveats

This is a planning tool, not legal or tax advice. The calculator models federal income tax only — state income tax, state cannabis excise tax, municipal cannabis tax, payroll tax, and sales tax are all separate burdens not modeled here. The federal scheduling status of cannabis is assumed to remain Schedule I as of the last-reviewed date; rescheduling to Schedule III or removal from the CSA would eliminate § 280E by its own terms. The CHAMP allocation modeled here is a flat percentage proxy for a defensible line-by-line attribution that must be supported by separate revenue, separate books, separate staff, and separate customers under CHAMP-vs-Olive. Consult a CPA or tax attorney before taking any of these positions on a return.

Last reviewed: 2026-05-16.