Can You Write Off a Hot Tub for Medical Reasons?

You can claim a hot tub tax deduction for medical reasons, but only if a licensed physician prescribes it in writing to treat a specific diagnosed condition, and even then the deductible amount is often smaller than the price you paid. The deduction lives under Section 213 of the Internal Revenue Code, which allows unreimbursed medical expenses that exceed 7.5% of your adjusted gross income, and only if you itemize on Schedule A.¹ If the tub is a permanent installation, you also have to subtract any increase in your home’s fair market value from what you paid before you deduct anything.

When a Hot Tub Counts as a Medical Expense

The IRS defines medical care as amounts paid for the diagnosis, cure, mitigation, treatment, or prevention of disease, or for affecting any structure or function of the body. That’s broad enough to cover hydrotherapy equipment when it treats a real medical problem. It does not cover expenses that are “merely beneficial to general health,” and the IRS specifically excludes spending tied to general wellness rather than a diagnosed condition.²

That’s where most hot tub claims live or die. A hot tub prescribed by a rheumatologist to manage degenerative arthritis is a medical expense. A hot tub you bought because soaking feels good after work is not, even if relaxation happens to lower your blood pressure. The IRS draws the line at whether the expense targets a specific condition rather than improving general well-being.

Conditions that commonly support a hydrotherapy prescription include arthritis, fibromyalgia, chronic back injuries, and certain musculoskeletal or neurological disorders. Publication 502 uses arthritis as an example in its discussion of medically necessary home modifications, which signals the IRS treats it as a legitimate basis for these expenses.² The IRS does not publish a list of qualifying conditions. What matters is the link between your specific diagnosis and the prescribed treatment.

The Documentation You Need Before You Buy

Get the written prescription first. The recommendation should come from a licensed physician or other qualified medical practitioner, name your diagnosed condition, explain why hydrotherapy is medically necessary for that condition, and specify the hot tub or spa as the prescribed treatment. A vague note saying “patient would benefit from warm water therapy” is not enough. Neither is a verbal recommendation, which is worthless in an audit.

Then keep every piece of paper: the doctor’s letter, purchase receipts, installation invoices, and any property appraisal you obtain. You do not submit these documents with your return, but you need them ready if the IRS asks.² Taxpayers who try to reconstruct records after an audit letter arrives are already at a disadvantage.

Portable Equipment Versus a Permanent Installation

How much you can deduct depends on whether your hot tub is portable equipment or a permanent home improvement, because the IRS applies different math to each.

A freestanding, plug-in hot tub that sits on a patio and could be moved to another home is treated as medical equipment. The full purchase price counts as a medical expense, subject to the 7.5% AGI floor. There is no property-value reduction because you haven’t permanently altered the home.

An in-ground spa, a built-in unit requiring custom plumbing and electrical work, or any installation that becomes a fixture is treated as a capital improvement. For capital improvements, the IRS requires you to subtract any increase in your home’s fair market value from the cost before counting the remainder as a medical expense.³ This is the single biggest factor that shrinks a hot tub deduction.

How the Capital Improvement Math Works

The regulation under Section 213 states that the cost must be reduced by any increase in the home’s value resulting from the installation.⁴ Only the excess is a medical expense. Publication 502 lays out a five-step worksheet:³

Enter what you paid for the improvement, including installation, wiring, and plumbing.
Enter your home’s value immediately after the improvement.
Enter your home’s value immediately before the improvement.
Subtract line three from line two. That’s the increase in value.
If the increase is less than the cost, subtract the increase from the cost. The result is your deductible medical expense.

Say you spend $18,000 on a built-in hot tub with installation, and an appraiser determines your home’s value rose by $5,000. Your deductible medical expense is $13,000. If the appraiser finds no value increase, the entire $18,000 counts. If the value increase equals or exceeds your cost, you get no capital medical deduction at all.

A professional appraisal showing the home’s value before and after the installation is the strongest way to document the change. Without one, the IRS can disallow the entire capital amount because you have no way to prove how much of the cost is deductible.

Operating Costs Are Deductible Too

Once the hot tub is established as medically necessary, the ongoing costs of running and maintaining it are also deductible as medical expenses. This holds even if the original capital cost produced no deduction because the home value increase wiped it out.⁵

Deductible operating expenses include the electricity to run the unit, water costs, sanitization chemicals, and repairs like replacing a heater or pump. Track these separately from your general household utilities. That means dedicated receipts, not after-the-fact estimates of the hot tub’s share of your electric bill.

Allocating Costs When the Family Uses It Too

If your family also uses the tub recreationally, you cannot deduct 100% of operating costs. Allocate expenses between medical and personal use based on time. If your doctor prescribes 10 hours of hydrotherapy per week and your family uses the tub for another 5 hours, two-thirds of operating costs are deductible and the remaining third is personal.

To support the split, keep a simple log recording the dates and times of your prescribed treatments. Without a usage log, you have no defense if the IRS questions the allocation and may lose the operating deductions entirely.

The 7.5% AGI Floor and the Itemizing Test

Qualified medical expenses, including the deductible portion of the hot tub’s capital cost and its operating expenses, go on Schedule A. You can only deduct the portion of your total medical expenses that exceeds 7.5% of your adjusted gross income.¹

With an AGI of $100,000, the first $7,500 of medical expenses produces no deduction. If your total qualified medical expenses for the year are $15,000, only $7,500 is deductible. The hot tub stacks with your other medical costs, so a year with surgery or major dental work can push you over the threshold more easily.

Itemizing only makes sense if your total itemized deductions exceed the standard deduction. For 2026, the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for head of household.⁶ If your medical deduction plus your other itemized deductions (state and local taxes, mortgage interest, charitable contributions) doesn’t clear that bar, the hot tub produces no actual tax savings. This is the arithmetic that surprises taxpayers who assume any medical expense automatically reduces the tax bill.

Reimbursements, HSAs, and FSAs

You can only deduct medical expenses that are not compensated by insurance or any other source.⁷ Subtract any reimbursement before including the expense in your deduction calculation. Most standard health insurance policies do not cover hot tub purchases, but if yours does, or if a workers’ compensation settlement or legal judgment covers the cost, only the out-of-pocket remainder qualifies.

Hot tubs are generally not eligible expenses under health savings accounts or flexible spending accounts without extra documentation. Most plan administrators classify them as personal items by default. With a Letter of Medical Necessity from your doctor explaining that the tub treats a specific diagnosed condition, some administrators will approve reimbursement. Check with yours before assuming you can use tax-advantaged health account funds for the purchase.

Where These Deductions Fall Apart

Hot tub deductions attract scrutiny because the IRS knows most people buy hot tubs for enjoyment. A few recurring mistakes cause most denials.

The prescription is verbal or vague. Language like “recommended for stress relief” or “beneficial for overall wellness” will be treated as a general health expense and denied. The note must name a diagnosed disease or condition.
The claim includes luxury features. The IRS limits the deduction to reasonable costs to accommodate a home to a disabled condition. A built-in waterfall, custom lighting, and premium landscaping around the spa are personal expenditures, not medical ones.³
There is no appraisal for a permanent installation, so the value-increase calculation cannot be shown.
There is no usage log for a tub the family also uses recreationally.

Treat this deduction as one you will have to defend. Build the paper trail before you file: the doctor’s letter naming the condition, the purchase and installation receipts, the before-and-after appraisal, and a contemporaneous usage log.

1
Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses
2
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
3
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses – Section: Capital Expenses
4
eCFR. 26 CFR 1.213-1 – Medical, Dental, Etc., Expenses
5
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses – Section: Operation and Upkeep
6
Internal Revenue Service. Rev. Proc. 2025-32
7
Internal Revenue Service. Topic No. 502, Medical and Dental Expenses