Can You Buy a Hot Tub With an HSA? Medical Necessity and IRS Rules

Yes, you can buy a hot tub with an HSA, but only when a licensed physician prescribes it to treat a diagnosed medical condition and you keep documentation to prove it. The rules get stricter if the tub is a permanent installation: only the portion of the cost that exceeds any increase in your home’s value counts as a qualified medical expense. Skip the paperwork or use the tub mainly for relaxation, and the IRS can treat the whole withdrawal as a non-qualified distribution.

When a Hot Tub Actually Qualifies

The IRS defines qualified medical expenses as costs for diagnosing, treating, or preventing disease, or for affecting a structure or function of the body.¹ Publication 502 draws the key line: the expense must primarily address a physical or mental condition, not just be “beneficial to general health.”² A hot tub used to unwind after work fails that test the same way a vacation does.

To clear the bar, the tub’s primary purpose has to be treating a diagnosed condition where hydrotherapy is part of the treatment, such as severe arthritis, chronic pain, or a musculoskeletal disorder. Publication 502 allows amounts paid for “special equipment installed in a home” when the main purpose is medical care for you, your spouse, or a dependent.² The word “main” carries weight. An eight-person spa with a built-in sound system and waterfall makes the medical-purpose argument harder to defend if anyone asks.

Get a Letter of Medical Necessity First

Before you spend HSA dollars, get a written prescription or letter of medical necessity from a licensed physician. The IRS doesn’t publish a template, but it does require you to keep records sufficient to prove your distributions paid for qualified medical expenses.³ Specificity is your protection.

A strong letter names your diagnosis, explains why hydrotherapy is the recommended treatment, states the prescribed frequency and duration, and addresses why alternatives like physical therapy sessions or a community pool won’t work for your condition. The tighter the link between your treatment needs and the tub’s features, the better your footing if your HSA administrator or the IRS asks questions.

Most HSA administrators treat a letter of medical necessity as valid for up to 12 months. If your hydrotherapy continues beyond that, ask your doctor for a fresh letter covering the next period. Hold onto the expired ones too, so your file shows continuous medical necessity rather than a gap.

Portable Tubs Are Simpler Than Permanent Ones

How the tub is installed changes the math. A permanent, built-in hot tub with custom decking, plumbing, and electrical work is a home improvement in the IRS’s eyes. A freestanding unit that sits on your patio and plugs into a dedicated outlet is not.

Publication 502 says that when a permanent improvement increases your home’s value, you can count only the cost that exceeds the value increase as a medical expense.² A built-in tub almost certainly moves the appraised value, so you’ll need appraisals and you’ll lose part of the deduction.

A portable medical-grade tub sidesteps that. Because it isn’t a permanent fixture, it generally doesn’t increase your property value, and Publication 502 says that when an improvement doesn’t increase home value, “the entire cost is included as a medical expense.”² You still need the letter of medical necessity, but you skip the appraisal and the value-offset calculation.

The Math for a Permanent Installation

Publication 502 lays out a simple worksheet: take the total cost of the improvement, subtract any increase in your home’s value, and the remainder is your qualified medical expense.²

Say you spend $15,000 on a built-in tub with installation, and an appraiser finds your home’s value rose $5,000 as a result. Only $10,000 qualifies. If the appraiser puts the value increase at $15,000 or more, nothing qualifies. Total cost includes delivery, electrical, plumbing, and any structural work needed to support the unit.

To document the change, you’ll need appraisals before and after installation. Residential appraisals typically run $400 to $1,500 depending on location and property. The appraisal fee itself is not a medical expense, so plan for it as an out-of-pocket cost. Getting the pre-installation appraisal before you commit gives you a realistic sense of how much of the project the IRS will actually let you reimburse.

Chemicals, Repairs, and Utility Costs

The purchase price isn’t the end of it. Publication 502 says amounts paid for the “operation and upkeep” of a capital asset qualify as medical expenses as long as the main reason is medical care, and this rule applies even if the original purchase only partially qualified.² Chemicals, filters, repairs, replacement parts, and the incremental increase in your electricity and water bills from prescribed hydrotherapy sessions all qualify.

Keep the same documentation standard for these ongoing costs. Save receipts for supplies and repairs, and hold onto utility statements that show the usage change. Comparing bills from before and after installation helps isolate the tub’s share. Vague estimates won’t hold up, so specific records matter.

Paying With the HSA or Reimbursing Yourself Later

You can pay directly with your HSA debit card or pay out of pocket and reimburse yourself afterward. For a hot tub, reimbursement is usually the smarter route. The qualified amount for a permanent install depends on an appraisal you may not have at the time of purchase, so paying upfront with your own money lets you pin down the eligible number before touching the HSA.³

There’s no deadline for HSA reimbursement. As long as you opened the HSA before the expense occurred, you can reimburse yourself months or years later. That also lets you leave money invested longer if that’s your strategy. Just make sure the letter of medical necessity, receipts, and any appraisal are filed away before you pull the funds.

For 2026, HSA contribution limits are $4,400 for self-only coverage and $8,750 for family coverage, with an additional $1,000 catch-up contribution if you’re 55 or older.⁴ A tub costing $5,000 to $15,000 can eat more than a full year of contributions, so many buyers spread the cost over time by paying out of pocket and reimbursing as their balance allows. You must be enrolled in a high-deductible health plan to contribute at all.

What Happens If the IRS Disagrees

If the IRS finds your hot tub doesn’t meet the medical expense standard, the withdrawal becomes taxable income for that year. On top of income tax, you’ll owe an additional 20% penalty on the distribution.⁵ On a $10,000 distribution, the penalty alone is $2,000, before your marginal income tax rate is applied.

The 20% penalty is waived if the distribution was made after you turned 65, after you became disabled, or after your death.⁶ At 65 or older, you’d still owe income tax on a non-qualified distribution, but the penalty disappears. For anyone younger, weak documentation gets expensive fast.

How Long to Keep Everything

The IRS requires records proving your HSA distributions went toward qualified medical expenses.³ The standard audit window is three years from your return’s filing date, but the IRS recommends keeping property-related records until the limitations period expires for the year you dispose of the property.⁷ For a permanent hot tub, that means holding the appraisals, receipts, and letter of medical necessity for as long as you own the home, plus at least three more years after you sell.

Even for a portable tub, keep everything at least three years after the return that reported the distribution. If you reimburse yourself years after buying the tub, the clock starts from the return reporting the reimbursement, not the year of purchase. Store digital copies of the physician’s letter, purchase receipts, installation invoices, and maintenance receipts in a single folder. If questions come five years from now, you want a file, not a search.

1
Office of the Law Revision Counsel. 26 U.S. Code 213 – Medical, Dental, Etc., Expenses
2
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
3
Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
4
Internal Revenue Service. Revenue Procedure 2025-19
5
Office of the Law Revision Counsel. 26 U.S. Code 223 – Health Savings Accounts
6
Internal Revenue Service. Instructions for Form 8889 (2025)
7
Internal Revenue Service. How Long Should I Keep Records?