What the IRS rules say
IRS Publication 502 lists qualified medical expenses. Prescription drugs count. So does a weight-loss program for a specific disease diagnosed by a doctor, and the IRS has long treated obesity as a disease for this purpose.
In practice, a GLP-1 bought with a valid prescription is generally an eligible expense. Your plan administrator makes the final call on each claim.
HSA versus FSA
| HSA | FSA | |
|---|---|---|
| Who can have one | People with a qualifying high-deductible health plan | Employees whose employer offers it |
| Rollover | Money stays yours year to year | Mostly use-it-or-lose-it, with limited carryover or grace period if your plan allows |
| Changing contributions | Any time | Usually only at open enrollment or a life event |
| Can pay for prescription GLP-1 | Generally yes | Generally yes |
Annual contribution limits change each year; check the IRS or your plan for current figures.
Paperwork to keep
- The pharmacy receipt showing drug name, date and amount paid
- Your prescription or a pharmacy printout that confirms it
- A letter of medical necessity from your prescriber, if your administrator asks for one
- Receipts for any cash-pay or direct-from-manufacturer purchases
Keep records for as long as the IRS could ask about that tax year. Many people keep them for at least 3 years after filing.
What pre-tax money is worth
Paying with pre-tax dollars means you skip income tax on that money, and usually payroll tax too for FSA and payroll HSA contributions. Someone in a 22% federal bracket saves roughly 22 cents of every dollar, plus any state tax.
See current cash prices in the cost index and run your own numbers in the cost calculator.
A simple worked example
Suppose you spend $100 a month on an eligible prescription. Paying from your paycheck after tax, a person in the 22% federal bracket who also pays 7.65% payroll tax and 5% state tax needs to earn about $153 to have $100 left to spend.
Paying from an FSA or a payroll HSA, that $100 comes out before those taxes. The saving is roughly a third of the cost in this example. Your own saving depends on your bracket, your state and whether you contribute through payroll.
- Plan your FSA election at open enrollment around expected yearly costs
- Check whether your FSA offers a carryover or grace period
- With an HSA, you can pay now or reimburse yourself later, as long as you keep receipts
Things that usually don't qualify
- Compounded products bought without a valid prescription
- General health foods or diet foods
- Gym memberships, unless tied to a specific diagnosed condition and your administrator approves
- Protein powders and supplements bought for general health
This is general information, not tax advice. Ask a tax professional about your situation.
Run the numbers
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Common questions
Can I use my HSA for Zepbound or Wegovy?
Generally yes, when you have a valid prescription. Prescription drugs are qualified medical expenses under IRS Publication 502, but your plan administrator decides each claim.
Do I need a letter of medical necessity?
Not always. Some administrators ask for one for weight-related expenses, so it helps to have your prescriber ready to write it.
Can I use FSA money for a cash-pay GLP-1?
Generally yes, if the drug is prescribed. Keep the receipt and prescription in case your administrator asks.
Sources
Clinician review pending. Drafted from primary sources and waiting for sign-off by a licensed clinician (MD, DO or PharmD) before launch. Every number is checked against its source. Drug facts are re-checked quarterly, prices monthly and whenever a label changes. How we review · Report an error