The Ultimate Guide to Cannabis Industry Tax Pitfalls

IRC §280E disallows ordinary business deductions for any trade or business 'trafficking' in controlled substances on Schedule I or II of the Controlled Substances Act. Marijuana remains a Schedule I substance federally, so cannabis businesses cannot deduct rent, wages, marketing, utilities, professional fees, or most other operating expenses on their federal returns. The only allowable deduction is Cost of Goods Sold (COGS), and the COGS calculation is narrower for cannabis sellers than for cultivators under §471(c).

For cannabis sellers (dispensaries): COGS is limited to the invoice cost of inventory plus directly identifiable acquisition costs. Indirect costs (rent on the dispensary, security, payroll for retail staff) cannot be inventoried under §263A because §280E disallows them. For cannabis cultivators and manufacturers: more costs qualify as COGS because §263A inventory rules apply — production costs are inventoried into COGS rather than being current-year deductions. The cultivator/seller distinction is the single most important §280E planning point.

Not on the federal return. §280E disallows all §162 ordinary and necessary business expenses for cannabis operations. Same-day expenses like rent, wages, insurance, marketing, and professional fees are non-deductible federally — they reduce cash but do not reduce federal taxable income. California state tax treatment differs — California decoupled from §280E for state purposes via R&T §17209 and §24436.1, so California allows ordinary deductions for state tax. The federal vs. state divergence creates substantial book-to-tax differences.

The CDTFA administers California's cannabis excise tax (15% of average market price) and sales tax. The cannabis excise tax is collected from retailers and remitted to the CDTFA quarterly. The CDTFA also runs targeted cannabis audit programs, with particular focus on unreported cash sales, exemption-certificate misuse, and excise-tax misreporting. Cannabis audits routinely take 12-24 months and produce assessments with §6829 personal liability exposure for responsible officers.

Effective July 1, 2025, the California cannabis excise tax rate was reduced from 15% to 7% (AB 564). The tax is computed on the average market price of cannabis sold to retailers and is collected by retailers from customers at the point of sale. Retailers remit the tax to the CDTFA quarterly on Form CDTFA-501-Q. Cannabis remains subject to standard California sales tax in addition to the excise tax. The rate changes periodically — verify current rate at the time of any analysis.

MSOs face §280E at the federal level and varying state treatment. States that have decoupled from §280E (California, Colorado, Oregon, others) allow ordinary deductions for state tax; states conforming to federal disallow them. The federal-state divergence produces substantial book-to-tax differences and effective tax rates that can exceed 70% for cannabis MSOs. Tax planning for MSOs focuses on entity structure (C-corp vs. pass-through), state apportionment, and maximizing COGS through cultivation operations that qualify for §263A treatment.

Active reform efforts: HR 3884 (MORE Act) and HR 1996 (SAFE Banking Act). The MORE Act would deschedule marijuana federally, ending §280E. The SAFE Banking Act addresses banking access but does not deschedule. The DEA was considering moving marijuana from Schedule I to Schedule III in 2024-2025, which would end §280E even without congressional action — but the rescheduling has been contested in administrative proceedings. As of mid-2026, §280E remains the operative federal law for cannabis businesses.

Comprehensive cost records distinguishing COGS from §280E-disallowed expenses: invoices, receipts, time records, allocation methodologies for shared costs (a security guard who works in cultivation vs. retail), inventory counts, and clear separation of cultivation/manufacturing/retail activities for cost allocation. Cash businesses need contemporaneous cash records — sales journals, daily reconciliations, bank deposit logs. IRS cannabis audits routinely reconstruct unreported sales from inventory and supply records; gaps in documentation favor the IRS.