Home Improvements That Increase Tax Basis vs. Repairs That Don't

TL;DR: Under IRS Publication 523, a home improvement adds to your tax basis if it adds value, prolongs the home's life, or adapts it to new uses — think a new roof, a room addition, or a $12,000 kitchen remodel. Routine repairs and maintenance, like patching drywall or replacing a faucet washer, don't count because they just keep the home in working order rather than improving it. Keeping receipts matters more than people think: a higher basis can shrink or eliminate capital gains tax when you sell, especially above the $250,000 single / $500,000 married exclusion.

_Last reviewed: August 2026 · 7 min read_

You've spent years fixing things around the house and you're not sure which of those receipts actually matter to the IRS. Some homeowners save every hardware store bill for 20 years only to find out half of it doesn't count toward their tax basis. The line between "improvement" and "repair" is narrower than most people assume, and getting it wrong can cost you thousands when you sell.

Okoniq Property Hub keeps a running log of every project, cost, and date so you're not digging through shoeboxes of receipts when tax season or a home sale arrives.

What actually counts as a capital improvement for tax purposes?

A capital improvement is anything that adds value to your home, extends its useful life, or adapts it for a new use, per IRS Publication 523. That's the legal test, and it's stricter than most homeowners expect. A new roof qualifies because it extends the life of the structure. A room addition qualifies because it adds value and square footage. A finished basement, a new HVAC system, or upgrading from 100 to 200 amp electrical service all pass the test because they change what the home can do or how long it will last.

The dollar threshold isn't fixed by the IRS, but practically speaking, a $200 improvement isn't worth tracking separately from a $15,000 kitchen remodel. Focus your recordkeeping on anything over roughly $500, since that's where the basis adjustment starts to matter on a future sale.

Which repairs don't increase your basis at all?

Routine repairs and maintenance never add to your basis, even if they're expensive. The IRS draws a hard line: if a project just keeps your home in ordinary, working condition rather than improving it, it doesn't count. Repainting a room, fixing a leaky faucet, patching a hole in drywall, or replacing a broken window pane are all repairs. So is patching drywall after a mistake or clearing a clogged drain.

This trips people up because repairs can be expensive and still not qualify. Spending $3,000 to fix storm damage on your siding is a repair if it just restores the siding to its prior condition. But if you use that same storm damage as an opportunity to upgrade to better materials, that portion becomes an improvement. The distinction is restoration versus enhancement, not price tag.

How do you tell the difference when a project blurs both categories?

Many real-world projects mix repair and improvement, and you're allowed to split them. If your roof needs partial repair after a storm but you also add a new layer of decking and better underlayment while you're up there, the repair portion doesn't count but the upgrade portion does. The same logic applies to siding maintenance that turns into a full upgrade — swapping damaged boards is a repair, but switching to new insulated siding across the whole house is a capital improvement.

| Repair (no basis increase) | Capital Improvement (basis increase) | |---|---| | Fixing a leaky pipe | Replacing old galvanized pipes with copper | | Patching a foundation hairline crack | Installing a French drain system | | Repainting interior walls | Adding a new room or deck | | Replacing a broken outlet cover | Rewiring old knob-and-tube wiring |

Keep separate line items on invoices when a contractor does both. A vague $8,000 invoice that says "roof work" is harder to defend than one itemized as "$2,000 storm repair, $6,000 new roof system with 30-year shingles."

Why does your tax basis even matter if you're not selling soon?

Your basis matters the moment you sell, and improvements made 10 or 20 years ago still count if you can document them. Basis is your original purchase price plus qualifying improvements, minus certain deductions like depreciation on a rental unit. When you sell, your taxable gain is the sale price minus your adjusted basis. A higher basis means a lower gain, which means less tax owed.

This matters most for owners approaching the $250,000 single or $500,000 married capital gains exclusion under Section 121. In high-appreciation markets, a home bought for $180,000 in 2005 and sold for $650,000 in 2025 could easily exceed the exclusion for a single filer. If that owner spent $60,000 over 20 years on a new roof, an addition after foundation work, and a kitchen remodel, that $60,000 directly reduces the taxable gain. Without records, none of it counts, and the IRS won't take your word for it after the fact.

How should you actually track this over the years?

Keep contractor invoices, permits, and payment records for every qualifying project, filed by year and separated from repair receipts. A simple spreadsheet with date, description, cost, and category (repair vs. improvement) is enough for most owner-operators. Photos before and after help if you ever need to justify a classification to a CPA or during an audit. Digital tools that timestamp entries are more reliable than a drawer of paper receipts that fade or go missing over 15 to 20 years of ownership.

FAQ

Does replacing a roof increase my tax basis?

Yes, a full roof replacement counts as a capital improvement because it extends the home's useful life, and you should keep the invoice showing materials, labor, and total cost.

Is a new furnace a repair or an improvement?

A full furnace replacement is a capital improvement since it's a new system, while repairing an existing furnace (like replacing a blower motor) is a repair with no basis impact.

Can I add landscaping costs to my tax basis?

Permanent landscaping like a retaining wall, new drainage system, or major grading project counts as an improvement, but routine lawn care, mulching, or seasonal planting does not.

What if I don't have receipts for improvements made decades ago?

You can use bank statements, old contracts, permits filed with your city, or even before-and-after photos as supporting evidence, though original itemized invoices are strongest if the IRS ever asks.

Does a rental property follow the same basis rules?

Rental properties follow similar capital improvement rules but also involve depreciation, which reduces your basis over time, so the math is more complex than for a primary residence.

This is educational information, not tax advice. Talk to a CPA about how specific improvements affect your basis and capital gains before you file or sell.