IRC 280E, CA excise, CDTFA, structures that survive audit. Plain English, cited to the regulation, updated as the rules change.
Scope. IRC § 280E is the most consequential tax rule affecting California cannabis operators. It disallows most ordinary business deductions. This guide covers the structures and documentation practices that preserve maximum legal deductions. Written by compliance consultants — not tax counsel. Engage a CPA and tax attorney before filing.
For most California retailers, federal effective tax rate under 280E lands between 55% and 85% of book net income — before state tax. The structure is not optional; the documentation is.
IRC § 280E states: “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 (or the activities which comprise such trade or business) consists of trafficking in controlled substances (within the meaning of schedule I and II of the Controlled Substances Act).”
The disallowance is keyed to schedule. Effective April 22, 2026, state-licensed medicinal cannabis is Schedule III under the DOJ final rule and falls outside 280E. Adult-use cannabis remains Schedule I and remains inside 280E. The DEA’s June 29, 2026 hearing addresses whether the rescheduling will extend to adult-use commercial activity; until that record closes, every adult-use licensee files as if 280E still applies to that channel.
A retailer serving both medicinal patients (18+ with a valid physician’s recommendation under Health & Safety Code § 11362.5) and adult-use customers (21+) now operates two distinct federal tax channels at one premises. Revenue is allocated by transaction type recorded at the point of sale; COGS is allocated by inventory disposition; operating expenses are allocated by reasonable and contemporaneous methodology — square footage, transaction count, payroll hours, or a hybrid — documented in writing and applied consistently. The allocation methodology becomes the single most-scrutinized item in any post-rescheduling federal exam.
Cost of Goods Sold (COGS) remains deductible because it’s a calculation of gross profit, not a deduction per se. The practical implication: costs properly allocable to COGS reduce taxable income; costs properly allocable to operating expense do not.
This makes the inventoriable-cost allocation under IRC 471 and IRC 263A the most important tax-planning lever in the industry.
For a cultivator, inventoriable costs typically include:
For a manufacturer:
C-corp vs. pass-through entities carry different 280E exposure patterns:
Pays tax at the entity level. 280E applies to the cannabis operation itself. Non-cannabis ancillary activity can be segregated into a non-cannabis subsidiary or management company.
Tax flows through to individual owners. 280E still applies at the trade-or-business level. Owners face individual-level 280E compounding effects (SE tax, personal AMT exposure).
A common structure: licensee entity holds the license and performs direct trafficking activity. A non-licensee management company provides services (admin, IP, marketing, finance) under a written services agreement. The management company is a non-cannabis trade-or-business whose ordinary deductions are preserved.
Key requirements:
On top of 280E, California imposes a 15% cannabis excise tax on gross retail receipts (Rev. & Tax. Code § 34011), collected by retailers and remitted quarterly to CDTFA. Most local jurisdictions layer 2–10% local cannabis business tax. Both are fully deductible at the entity level but reduce operating margin significantly.
California does not conform to IRC § 280E for Personal Income Tax purposes (Rev. & Tax. Code § 17209) or for Corporation Tax purposes. Ordinary cannabis business deductions are available at the state level.
A Los Angeles storefront posts $5,000,000 in gross receipts with $3,100,000 in cost of goods sold (wholesale inventory cost, freight-in, testing, inventoriable receiving labor) and $1,400,000 in operating expenses (rent on the non-limited-access frontage, marketing, G&A, corporate salaries, professional services):
A cultivator with the same revenue and $2,800,000 in inventoriable cost (including direct grow labor, climate and lighting utilities, cultivation rent, nutrients, and an allocated share of supervisory labor per Reg. § 1.471-11) would carry roughly one-third the effective 280E burden of the retailer above — because more of its cost is properly capitalized to inventory.
Cannabis operators face higher IRS audit frequency than baseline. The defensible audit posture:
For licensees with a meaningful medicinal channel, the post-April-22-2026 federal posture is materially different. Operating expenses fairly allocated to medicinal sales return to deductibility, the management-company structure becomes less load-bearing on the medical side, and the state/federal effective-rate differential narrows on that channel. Adult-use exposure is unchanged pending the DEA’s June 29, 2026 hearing record. For tax-year 2026, the conservative posture is: file as if 280E still applies to adult-use revenue, claim ordinary deductions on medicinal revenue with full allocation documentation, and reserve a contingency for any retroactive treatment Treasury or the IRS publishes through revenue procedure or notice.
