Taxes on medical marijuana purchases usually include state sales tax (unless your state exempts medical cannabis), one or more state excise taxes, and sometimes a local surcharge on top. Roughly a dozen states exempt medical cannabis from sales tax entirely. On the federal side, you can’t deduct what you spend as a medical expense or pay for it with an HSA or FSA, and a federal tax rule aimed at dispensaries quietly pushes retail prices higher than they’d otherwise be.
Sales Tax at the Register
Sales tax on medical cannabis works like sales tax on anything else. The dispensary collects a percentage of the retail price at checkout and remits it to the state. What varies is whether your state treats medical cannabis as medicine or as an ordinary taxable product.
A growing number of states exempt medical cannabis from state sales tax entirely. These exemptions mirror how most states treat prescription drugs, but because cannabis can’t be prescribed through the federal system, the exemption has to be written into state law specifically for cannabis. To claim it, you’ll usually need to show a valid medical cannabis ID card and a government-issued ID at the point of sale. Without the card, you pay the same rate as any other customer.
States that don’t offer an exemption apply their standard sales tax rate. A handful split the difference with a reduced rate for medical purchases. Before you buy, check where your state falls, because that single factor can save you several percentage points on every visit.
Excise Taxes Built Into the Price
Excise taxes are separate from sales tax and usually less visible, because they’re collected earlier in the supply chain. Instead of showing up as a line item on your receipt, they’re paid by the grower or distributor and then passed along in the shelf price. States use three main structures.
- Percentage-of-price taxes function like a sales tax calculated on either the wholesale or retail price. The retailer or cultivator remits it, but the cost flows through to what you pay.
- Weight-based taxes charge a set amount per ounce or gram at the first sale from the cultivator. Different parts of the plant are taxed at different rates, with flower taxed highest because it’s the most potent portion.
- Potency-based taxes calculate the tax on milligrams of THC in the product, similar to how many states tax alcohol by proof. Rates differ across flower, edibles, and concentrates.
Some states layer more than one of these on top of each other, and the combined effect can be substantial before sales tax even enters the picture.1Tax Policy Center. How Do State and Local Cannabis Taxes Work Medical patients are often exempt from some or all of the excise taxes that hit recreational sales, but this varies by state. Ask your dispensary which taxes are already included in the price you’re seeing.
Local Taxes That Add to the Bill
State taxes aren’t the whole picture. Many states let counties and cities impose their own cannabis taxes, and these take several forms. Some add a percentage-based sales tax on top of the state rate. Others levy gross receipts taxes on dispensaries or tax cultivation facilities based on the square footage of their growing space. All of it eventually lands in the shelf price.
Two patients in the same state can pay noticeably different effective tax rates depending on which city or county their dispensary sits in. The total tax burden at the register can end up well above the listed state rate once local levies are included.1Tax Policy Center. How Do State and Local Cannabis Taxes Work If you live near a jurisdictional boundary, comparing prices across dispensaries in different municipalities can meaningfully cut what you spend.
Why a Medical Card Costs Less Than Buying Recreational
In states with both medical and recreational programs, a medical card almost always means paying less at checkout. Recreational cannabis often carries combined state and local tax rates of 20% to 30% or higher, while medical patients in the same state might pay only standard sales tax, a modest excise tax, or nothing at all.
The savings show up in several ways. Some states fully exempt medical purchases from the excise taxes recreational buyers pay. Others waive the retail excise tax for registered patients while still applying a lower wholesale-level tax. A few states exempt medical cannabis from sales tax while keeping recreational purchases fully taxable. For patients who consume regularly, the cumulative annual difference can easily run into the hundreds of dollars, which usually makes maintaining a medical card worthwhile even where recreational access exists.
The Hidden Federal Tax That Raises Every Price
The most expensive tax on medical cannabis is one you’ll never see on your receipt. Section 280E of the Internal Revenue Code says no deduction or credit is allowed for any amount paid in carrying on a trade or business that consists of trafficking in a Schedule I or Schedule II controlled substance.2Office of the Law Revision Counsel. 26 USC 280E – Expenditures in Connection With the Illegal Sale of Drugs Because cannabis remains Schedule I under federal law, every state-legal dispensary in the country is subject to this rule.
In practice, a dispensary can’t deduct rent, employee wages, marketing, utilities, or any of the ordinary expenses other legal businesses write off. The only subtraction allowed is the cost of goods sold, meaning the direct cost of acquiring or producing the cannabis itself. Everything else is taxed as if it were pure profit. That pushes the effective federal tax rate on cannabis businesses to 60% to 70% or higher, and those costs land in the price patients pay.
What You Can’t Claim on Your Federal Return
Your state may treat cannabis as medicine, but the federal government does not, and that blocks several tax benefits patients might reasonably expect.
The IRS explicitly states that you cannot include controlled substances like marijuana in your medical expense deduction, even if the substance is legal under state law.3Internal Revenue Service. Publication 502 – Medical and Dental Expenses The medical expense deduction under IRC Section 213 covers costs for the diagnosis, cure, and treatment of disease, but the IRS draws a hard line at substances that remain federally illegal. Even if your out-of-pocket medical costs clear the adjusted gross income threshold, cannabis spending doesn’t count toward the total.
The same classification blocks Health Savings Accounts, Flexible Spending Accounts, and Health Reimbursement Arrangements. These accounts are governed by the federal definition of “medical care,” and cannabis isn’t recognized as medical care at the federal level. This holds regardless of your state, your doctor’s recommendation, or your medical card.
A debit card linked to an HSA may process at the register, but the purchase isn’t a qualified expense. If the IRS reviews your HSA withdrawals, cannabis purchases would be treated as non-qualified distributions subject to income tax and a 20% penalty.
What Rescheduling Could Change
The federal government has been moving toward reclassifying cannabis from Schedule I to Schedule III of the Controlled Substances Act. The Department of Justice proposed the change in May 2024, and in December 2025, President Trump signed an executive order directing the attorney general to expedite the process.4The White House. Increasing Medical Marijuana and Cannabidiol Research The executive order doesn’t change the law by itself. The DEA must complete a formal rulemaking process, and as of early 2026, administrative hearings have been postponed while a related appeal is resolved. Until a final rule is issued, cannabis remains Schedule I and every tax consequence above stays in place.
If rescheduling is finalized, the biggest financial impact for patients would be indirect. Section 280E applies only to Schedule I and Schedule II substances, so moving cannabis to Schedule III would let dispensaries deduct normal business expenses for the first time.2Office of the Law Revision Counsel. 26 USC 280E – Expenditures in Connection With the Illegal Sale of Drugs That alone could cut the effective federal tax rate on cannabis businesses by 30 to 40 percentage points, and competitive pressure would eventually push those savings into shelf prices.
Rescheduling could also open the door to treating medical cannabis as a deductible medical expense and to HSA or FSA reimbursement, but neither outcome is guaranteed. The IRS would need to update its guidance, and eligibility might depend on whether cannabis products receive FDA approval or whether a doctor’s recommendation qualifies the same way a prescription does for other Schedule III drugs. Don’t make financial decisions based on anticipated rescheduling until the DEA issues a final rule and the IRS clarifies how it will treat cannabis expenses.