Is a Pool Considered a Home Improvement for Taxes?

For federal tax purposes, a pool is considered a home improvement: the IRS treats a swimming pool as a capital improvement that adds to your home’s cost basis, which can reduce your taxable gain when you sell.¹ What it usually is not is a deduction you can take the year you build it. That immediate write-off exists only in narrow circumstances, mainly when a physician prescribes the pool to treat a diagnosed condition. For most homeowners, the payoff arrives years later at the closing table.

What Makes a Pool a Capital Improvement

IRS Publication 523 defines a capital improvement as something that adds value to your home, extends its useful life, or adapts it to a new use, and it specifically lists swimming pools among qualifying improvements.¹ The distinction that matters is improvement versus maintenance. Building a pool is an improvement. Replastering the interior of an existing pool or replacing the pump is maintenance, and maintenance does not adjust your basis.

Publication 523 does not separate in-ground and above-ground pools by name. In practice, the IRS looks at whether an addition is permanent and conveys with the property at sale. A poured-concrete in-ground pool clearly qualifies. A portable above-ground unit you could disassemble and take with you is harder to defend as a lasting addition to the real estate. If you install an above-ground pool and want to treat it as a capital improvement, leaving it in place through a sale and documenting that it transferred with the home strengthens your case.

How the Basis Increase Pays Off When You Sell

Your home’s adjusted basis starts at what you paid and grows with every qualifying improvement you add. When you sell, your taxable gain is the sale price, minus selling expenses, minus that adjusted basis. Add a pool and the basis goes up; the eventual gain goes down.

Say you bought for $300,000 and later spent $60,000 on a pool. Ignoring other improvements, your basis climbs to at least $360,000. Sell for $650,000 and your gain drops from $350,000 to $290,000 before other adjustments.¹

Whether that reduction saves real money depends on the home-sale exclusion under Section 121. If you owned the home and used it as your principal residence for at least two of the five years before the sale, you can exclude up to $250,000 of gain as a single filer or up to $500,000 on a joint return where both spouses meet the use test.² Comfortably under those numbers, the basis bump is a paper benefit. On a high-value property where the gain would otherwise blow past the exclusion, it becomes cash saved.

Because that benefit may sit dormant for decades, records are everything. Keep the construction contract, invoices, cancelled checks, and permit receipts for as long as you own the home and for at least three years after you file the return for the year you sell.³ Lose the paperwork and you lose the basis adjustment.

When a Pool Can Be Deducted as a Medical Expense

A pool can produce an immediate deduction, but only when its primary purpose is medical care for a diagnosed condition. Section 213 of the tax code allows a deduction for medical expenses paid to diagnose, treat, or mitigate disease, or to affect a structure or function of the body.⁴ A physician-prescribed pool for hydrotherapy to treat something like severe arthritis or a spinal injury can meet that standard. A pool recommended for general fitness or stress relief does not.⁵

Calculating What You Can Actually Deduct

Even a medically necessary pool is not fully deductible. The IRS requires you to subtract any increase in your home’s fair market value caused by the pool. Publication 502 lays out the arithmetic: what you paid, minus the value the pool added to the property, equals the potential medical expense.⁵ Spend $50,000, gain $30,000 in appraised value, and only $20,000 is a candidate for the medical deduction. If the value increase equals or exceeds the cost, nothing qualifies.

The portion that added to your home’s value is not wasted. It still increases your cost basis and reduces gain when you sell. Ongoing operating costs, such as chemicals, electricity, and maintenance, can also be deductible in later years to the extent the pool continues to serve its medical purpose.⁶

The AGI Floor and the Itemizing Requirement

Two more filters shrink the benefit further. Medical expenses are deductible only to the extent they exceed 7.5% of your adjusted gross income.⁴ At $100,000 of AGI, the first $7,500 of total medical costs produces no deduction; only the excess counts.

Medical expenses also live on Schedule A, meaning they help only if your itemized deductions beat the standard deduction. For 2026, the standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly.⁷ A homeowner already itemizing because of a mortgage and property taxes can meaningfully add a pool-related medical expense on top. A standard-deduction filer gets nothing.

Documentation the IRS Expects

A five-figure medical deduction on a pool will draw scrutiny. You will want a written prescription or recommendation from your physician tying the pool to a specific condition, professional appraisals of home value before and after installation, construction invoices and permits, and clinical records showing how the pool is used therapeutically. Hold those documents for at least three years after filing the return that claims the deduction.⁸

Financing the Pool With Home Equity

If you use a home equity loan or line of credit to pay for the pool, the interest generally qualifies as deductible mortgage interest, because the borrowed money is being used to substantially improve the residence securing the loan.⁹ Building a pool counts as a substantial improvement. If you draw on the same line to pay off credit cards, the interest on that portion is not deductible.

Total mortgage debt on which you can deduct interest is capped at $750,000 across your primary mortgage and any home equity borrowing combined. The cap was originally set by the Tax Cuts and Jobs Act and was made permanent under the One, Big, Beautiful Bill. A $600,000 mortgage plus a $100,000 home equity loan for the pool sits at $700,000, comfortably under the limit. Like the medical deduction, mortgage interest is itemized on Schedule A.

Expect Your Property Tax Bill to Rise

The federal benefits may take years to matter, but the local tax hit usually arrives fast. Property tax assessors set values based on your land and everything permanently built on it. A permanent in-ground pool raises that assessed value, and once your building permits move through the local office, a reassessment tends to follow.

The size of the increase depends on how much value the assessor assigns to the pool and the local tax rate. A pool assessed at $40,000 in a jurisdiction with a 1% effective rate adds about $400 a year. A 2% rate makes it $800. This is a recurring cost for as long as you own the property.

If the assessor’s number looks high, most jurisdictions let you appeal. Deadlines are typically short after the new assessment notice arrives, and you will need evidence for a lower value, such as an independent appraisal or comparable sales showing that pools in your area do not add what the assessor assumed.

One catch on the federal side: the deduction for state and local taxes is currently capped at $40,000 for most filers, or $20,000 for married individuals filing separately, with the cap phasing down for taxpayers earning above $500,000. If your combined state income and property taxes already hit the cap, the extra property tax from the pool produces no additional federal deduction.

If the Pool Is at a Rental Property

The treatment shifts if the pool is at a residential rental rather than your own home. Instead of waiting for a sale, you can depreciate the pool and deduct a portion of the cost each year against rental income. Publication 527 classifies a swimming pool as a land improvement, which is 15-year property under the Modified Accelerated Cost Recovery System.¹⁰ For property placed in service in the 2026 tax year, the permanent 100% bonus depreciation provision under the One, Big, Beautiful Bill may allow a full first-year deduction for qualified property acquired after January 19, 2025, with elections available for 40% or 60% instead.¹¹ The best strategy depends on your rental income and overall tax picture, and is worth running past a tax professional.

What Does Not Qualify

Energy-efficient pool equipment. The Residential Clean Energy Credit and the Energy Efficient Home Improvement Credit are unavailable for property placed in service after December 31, 2025, and solar water heaters used for swimming pools were already excluded when those credits were active. A variable-speed pump or solar heater may cut utility bills, but it will not cut your 2026 taxes.¹²¹³
Routine maintenance and repairs. Chemicals, filter replacements, resurfacing, and equipment repairs on a personal residence are personal expenses. They do not raise basis and are not deductible, except when the pool serves a documented medical purpose and the costs are tied to that use.⁵
Portable or temporary pools. An inflatable or freestanding above-ground pool you plan to take with you when you move does not add to your home’s basis. If it does not transfer with the property, it is not an improvement to the property.
General wellness. A doctor saying swimming is good exercise is not the same as prescribing a pool to treat a specific condition. Publication 502 specifically names swimming lessons recommended by a doctor as nondeductible.⁵

1
Internal Revenue Service. Publication 523 (2024), Selling Your Home – Section: Improvements
2
Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
3
Internal Revenue Service. How Long Should I Keep Records?
4
Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses
5
Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
6
eCFR. 26 CFR 1.213-1 – Medical, Dental, Etc., Expenses – Section: Definitions
7
Internal Revenue Service. Tax Inflation Adjustments for Tax Year 2026
8
Internal Revenue Service. Topic No. 305, Recordkeeping
9
Internal Revenue Service. Real Estate (Taxes, Mortgage Interest, Points, Other Property Expenses) 2
10
Internal Revenue Service. Publication 527 (2025), Residential Rental Property
11
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
12
Internal Revenue Service. Residential Clean Energy Credit
13
ENERGY STAR. Solar Energy Systems Tax Credit