You cannot claim a medical marijuana tax deduction on your federal return, even if your state has a legal medical cannabis program and you hold a valid patient card. The IRS treats marijuana as a controlled substance that isn’t legal under federal law, which puts it outside the definition of a deductible medical expense.1Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses A few FDA-approved prescription drugs derived from cannabis are a different story, and those do qualify.
Why the Federal Deduction Is Off the Table
Marijuana is a Schedule I controlled substance under the Controlled Substances Act, meaning the federal government does not recognize it as having accepted medical use.2Office of the Law Revision Counsel. 21 USC 812 – Schedules of Controlled Substances State legalization does not change how the federal tax code treats it. IRS Publication 502 states directly that you can’t include in medical expenses amounts you pay for controlled substances such as marijuana that aren’t legal under federal law, even if the substance is legalized by state law.1Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
Two independent rules block the deduction. First, the tax code limits deductible medicines to “prescribed drugs” and insulin, and a prescribed drug is one that requires a physician’s prescription.3Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses Because marijuana sits on Schedule I, physicians can’t prescribe it. State programs use “recommendations” or “certifications,” which don’t meet the federal definition. Second, the Treasury regulation that governs the medical expense deduction excludes amounts spent on illegal operations or treatments.4eCFR. 26 CFR 1.213-1 – Medical, Dental, Etc., Expenses
The bar covers everything tied to the purchase: the cannabis itself, dispensary fees, cultivation supplies, and the doctor visits or evaluations used to obtain a state medical marijuana card.
HSAs and FSAs Follow the Same Rule
Health Savings Accounts, Flexible Spending Accounts, and Health Reimbursement Arrangements all use the IRS definition of a qualifying medical expense. Marijuana is excluded from that definition, so you can’t use any of these tax-advantaged accounts to pay for it.1Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
If you do it anyway, the withdrawal counts as a non-qualified distribution. For an HSA, that means income tax on the amount plus a 20% penalty if you’re under 65. An FSA distribution used this way loses its tax-free treatment and can create problems with your plan administrator.
Cannabis-Derived Prescriptions That Do Qualify
Not everything from the cannabis plant is treated the same way. The FDA has approved several cannabis-related prescription medications, and because they’re federally legal and require a physician’s prescription, they qualify for the medical expense deduction like any other prescription drug.5U.S. Food and Drug Administration. FDA and Cannabis – Research and Drug Approval Process
- Epidiolex, a cannabidiol product derived from the cannabis plant, approved for seizures associated with Lennox-Gastaut syndrome and Dravet syndrome.
- Marinol and Syndros, both containing synthetic THC (dronabinol), prescribed for chemotherapy-related nausea and AIDS-related anorexia.
- Cesamet, which contains synthetic nabilone, indicated for chemotherapy-related nausea.
All four require a physician’s prescription, so they meet the “prescribed drug” test under the tax code.3Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses If a patient’s condition can be treated with one of these instead of dispensary cannabis, the tax treatment is completely different. Worth asking your provider about.
Would Federal Rescheduling Fix This?
Not necessarily. In 2023, the Department of Health and Human Services recommended moving marijuana from Schedule I to Schedule III, and the Department of Justice issued a proposed rescheduling rule in May 2024. As of December 2025, the rule was still awaiting an administrative law hearing, and a December 2025 executive order directed the Attorney General to complete the rulemaking “in the most expeditious manner” allowed by federal law.6The White House. Increasing Medical Marijuana and Cannabidiol Research
Even if marijuana moves to Schedule III, the tax code’s “prescribed drug” requirement still applies. State programs continue to issue recommendations rather than prescriptions, so unless prescribing practices change or Congress amends the tax code, a Schedule III classification would not automatically make dispensary purchases deductible. Watch the space, but don’t plan a return around it.
The Medical Expense Threshold Most Filers Never Cross
Even for expenses that do qualify, the deduction is narrower than many people expect. You can only deduct unreimbursed medical costs that exceed 7.5% of your adjusted gross income, and only if you itemize on Schedule A.1Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses Someone with an AGI of $60,000 would need more than $4,500 in qualifying medical expenses before any deduction begins.
Itemizing also has to beat the standard deduction. For tax year 2026, that’s $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Most taxpayers take the standard deduction, so medical expenses never enter the calculation. If you do itemize, qualifying costs include doctor visits, hospital stays, prescription medications, medical equipment, and certain transportation for medical care.4eCFR. 26 CFR 1.213-1 – Medical, Dental, Etc., Expenses
What Happens If You Claim It Anyway
Claiming the deduction and hoping the IRS doesn’t notice is a bad bet. The agency can assess an accuracy-related penalty of 20% on the portion of any underpayment caused by negligence or disregard of tax rules.8Internal Revenue Service. Accuracy-Related Penalty Deducting an expense the IRS has explicitly said is not allowed fits that description. You would also owe the tax originally due plus interest running from the return’s due date, and if the IRS treats the claim as intentional rather than careless, a 75% civil fraud penalty is on the table.
State Returns May Treat It Differently
State income tax rules don’t always follow federal law. Some states that have legalized medical marijuana have decoupled from federal restrictions in various ways, and whether any specific state allows individuals to deduct medical marijuana as a personal medical expense depends on how that state defines qualifying medical expenses. The rules vary and change often.
If your state has a medical marijuana program, ask a tax professional familiar with your state’s code. Any state-level deduction only reduces your state tax bill and doesn’t affect the federal return. Keep receipts for dispensary purchases, physician evaluation fees, and card costs in case a state-level deduction is available.