What the IRS actually allows, when it works, and the fine print most people miss.
The Short Answer
Yes — it’s a real thing. The IRS does allow a swimming pool to be deducted as a medical expense in certain situations. But before you get too excited, there’s a long list of fine print, and the rules are stricter than most people realize. In plain English: if your doctor prescribes a pool to treat a specific medical condition, you may be able to deduct a portion of the cost. Emphasis on portion, and emphasis on may.
If you’re hoping for a simple “buy a pool, write it all off” answer — that’s not how it works. But for the right person in the right situation, the savings can be real. Let’s walk through it.
Why This Rule Even Exists
The IRS isn’t in the business of rewarding people for having a nice backyard. The whole reason this deduction exists is because sometimes a piece of your home genuinely becomes medical equipment. A wheelchair ramp. A walk-in tub. A stair lift. Those are all capital improvements to a house that the IRS recognizes as medical expenses when they’re needed to treat a real condition.
A swimming pool can fall into the same category. If someone has severe arthritis, gout, osteoporosis, multiple sclerosis, a spinal injury, certain cancers, chronic pain, or is recovering from a major surgery, aquatic therapy is often one of the few forms of exercise they can do. Water supports body weight, takes pressure off joints, and lets people move in ways they physically can’t on dry land. For some folks, a pool isn’t a luxury — it’s treatment.
That’s what the rule is for — people who actually need the water. What the IRS is trying to prevent is every homeowner with a sore back calling their pool a medical device.
The Fine Print
1. You Need a Doctor’s Prescription — a Real One
This is the single most important piece. Not a verbal recommendation. Not a note that says “swimming would be good for you.” You need a written prescription from a medical doctor (MD) that specifically states the pool is necessary to treat a named medical condition.
The language matters. “Recommended for general health” won’t cut it. “Prescribed as medically necessary treatment for [specific condition]” is what you want. The IRS has denied deductions where the only documentation was a doctor telling someone to lose weight. That’s not specific enough.
2. The Pool Must Be Primarily for Medical Use
The IRS wants to see that the pool is mainly being used for therapy — not for the grandkids’ birthday parties. That doesn’t mean the family can’t ever swim in it, but the primary purpose has to be the medical treatment. If you’re deducting the pool and then posting pool-party photos every weekend, you may have a problem if you get audited.
3. You Can Only Deduct the Amount That Doesn’t Add Value to Your Home
Here’s where most people get tripped up. The IRS says: if the pool increases the value of your home, you have to subtract that increase from what you’re allowed to deduct.
Example in plain English: let’s say you install a pool for $60,000. You get an appraisal that shows your home value went up by $20,000 because of the pool. The IRS says the $20,000 of added home value isn’t a medical expense — it’s an investment in your house. So your deductible amount starts at $40,000, not $60,000.
This is why you need an appraisal. Not optional. You want a written appraisal from a qualified appraiser showing the before-and-after value of your home.
4. You Have to Itemize — and Clear the 7.5% AGI Hurdle
This one catches a lot of people. To deduct medical expenses at all, you have to itemize your taxes (meaning you’re not taking the standard deduction). Then, you can only deduct the portion of your total medical expenses that exceeds 7.5% of your Adjusted Gross Income.
Translation: if your household income is $100,000, the first $7,500 of medical expenses doesn’t count. Only what’s above $7,500 is deductible.
For most families installing a pool for medical reasons, the pool cost alone will blow past that threshold. But it’s worth knowing. If you have very low medical expenses otherwise and a high income, the math works differently than you might expect.
5. Operating and Maintenance Costs Also Qualify
Here’s some good news. If your pool qualifies as a medical expense, the ongoing costs to run it also qualify — chemicals, electricity to run the pump, heating costs, repairs, routine maintenance. As long as the medical condition is ongoing and the pool is still being used for treatment, those expenses keep adding to your medical deduction year after year.
Even better: in some cases, even if the original installation cost didn’t end up being deductible (because of the home-value offset or the AGI threshold), the ongoing operating costs may still be deductible on their own.
6. Keep Records Like Your Life Depends on It
This is the kind of deduction that can draw IRS attention. Not because it’s illegal — because it’s unusual. If you’re going to take it, document everything:
- The original prescription from your doctor, with the specific condition named.
- The before-and-after home appraisal.
- All receipts for the pool, installation, equipment, and ongoing maintenance.
- A record of how the pool is being used (therapy schedule, usage log — some folks keep a simple notebook).
- Any follow-up notes from the doctor confirming ongoing medical need.
If the IRS ever questions it, you want a folder you can hand over that makes the case airtight.
Who This Actually Works For
Realistically, this deduction makes the most sense for someone who:
- Has a serious, documented medical condition that benefits from aquatic therapy.
- Has a doctor willing to write a specific, detailed prescription.
- Is installing a pool mainly because of that condition — not adding medical justification to a pool they already wanted.
- Has the income and tax situation where itemizing makes sense.
- Is willing to keep thorough records and, ideally, work with a CPA.
If you check those boxes, this can be a significant tax break. If you don’t, trying to force the deduction is the kind of thing that turns a pool purchase into an audit headache.
Does the Type of Pool Matter?
The IRS rules don’t specify a pool type — an above-ground, semi-inground, fiberglass inground, or vinyl inground pool can all potentially qualify. What matters is the medical purpose, not the construction style.
That said, for serious aquatic therapy, you want a pool that’s useable year-round (or as close to it as possible), has enough depth and space for the prescribed exercises, and is easy to get in and out of. Some people opt for therapy-specific features like handrails, zero-entry steps, or heaters that can hold warm therapeutic temperatures. Those accessibility upgrades can themselves qualify as medical expenses.
The Bottom Line
The swimming pool medical deduction is real, but it’s not a loophole. It’s a legitimate tax provision for people with legitimate medical needs. If that’s you or someone in your family, talk to your doctor first. If they agree the pool is medically necessary, get it in writing with specific language. Then talk to a CPA — not a general tax preparer, a CPA who has handled capital medical expenses before — before you start the project. They can walk you through the appraisal process and make sure the paperwork is right from day one.
Get the paperwork right and it’s a real tax break. Skip steps and it’s a red flag on your return. The difference is literally just documentation.
A note from MGK Pools: This article is educational only — we’re pool people, not tax people. Please consult a qualified CPA or tax professional before claiming any medical expense deduction. IRS Publication 502 is the official source on medical and dental expenses.
