New Homeowner Resource
Start a home improvement log the week you move in
Every dollar you put into the house can lower your tax when you sell one day. The catch is you have to keep the records. Here is how, and why it matters more than most owners realize.
The day you buy is the day to start a habit that pays off years from now. Keep a simple record of the money you put into improving the home. It sounds like paperwork you will never need. In this market, it can be worth thousands when you sell.
Here is the idea in plain terms, and a system you can actually keep up with.
What cost basis means
Your cost basis is essentially what the home cost you. It starts with your purchase price plus certain buying costs. Over the years, when you make a capital improvement, you add that cost to your basis, which gives you your adjusted basis.
Why you care: when you sell, your taxable gain is roughly the sale price minus your adjusted basis. The higher your basis, the smaller the gain the government can tax. Every documented improvement raises your basis and quietly shrinks that future tax bill.
Cost basis applies to any property you own, so the log is worth keeping either way. The difference is the payoff at sale. On your primary home you also get the exclusion below, which shields a large chunk of gain. On a rental or investment property there is no personal-residence exclusion and depreciation comes into play, so a documented basis matters even more. This page is written for your primary home, but the habit carries over.
Improvement or repair? The line that decides it
The tax rules treat these two very differently, and only one of them helps your basis.
Capital improvements (they count)
Work that adds value, extends the home's life, or adapts it to a new use. A new roof, a room addition, a kitchen or bath remodel, new HVAC, a pool, new windows throughout, upgraded electrical or plumbing.
Repairs and maintenance (they do not)
Work that just keeps the home in its current condition. Fixing a leak, repainting a room, patching drywall, replacing a broken pane. Routine upkeep does not raise your basis on its own.
One useful exception: a repair can count if it is part of a larger remodel. Replacing one cracked window is a repair. Replacing every window in the house as one project is an improvement. When in doubt, keep the record and let your tax professional sort it at sale.
Quick check: does it add to basis?
Tap each one to see how it usually lands. When in doubt, keep the receipt anyway.
New roof
Usually counts. A full roof replacement adds value and extends the home's life, so it typically adds to your basis.
Repainting a bedroom
Usually does not. Paint is routine maintenance on its own. If it is part of a larger remodel of that space, it can count with the project.
Kitchen or bathroom remodel
Usually counts. A remodel that upgrades or reconfigures the space adds value and adds to basis. Keep the full invoice.
Fixing a leaky faucet
Usually does not. A standalone repair that keeps things working is maintenance. Bundled into a full plumbing upgrade, it can count.
New HVAC, solar, or a room addition
Usually counts. New systems and additions are classic capital improvements. Save contracts, permits, and photos.
The federal home sale exclusion can shield up to 250,000 dollars of gain if you file single, or 500,000 dollars if you are married filing jointly, when you meet the ownership and use tests. Across LA, the Inland Empire, and Orange County, homes have appreciated enough that long-time owners can blow past those limits. A well documented basis is what keeps more of your gain out of the taxable column.
The system: a log and a folder
You do not need software. You need two things you will actually maintain.
First, a running log. A note on your phone, a spreadsheet, whatever you will keep open. For each project, write the date, what it was, and what it cost. That is it.
Second, a folder for proof. Keep the receipts and invoices, the contractor agreement, any permits pulled, and a couple of before and after photos. Digital is fine, and a backup is smart. The photos matter more than people expect, because they show the work was real and when it happened.
Keep this folder alongside your closing documents, especially your settlement statement. That statement sets your starting basis, and your improvement log builds on top of it. Together they are what your tax professional uses to figure your gain.
Hold these records for as long as you own the home, and for a few years after you sell, in case a return is ever reviewed. The improvement you made in year two only helps if you can still prove it in year fifteen.
We can set you up when you sell
When the day comes to sell, bring us the log. We will walk through it with you and make sure your improvements are captured before we price and market the home, and we will coordinate with your tax professional on the basis.
Most owners lose this money simply because nobody told them to keep the paper. Now someone has.
This page is for general information only. It is not tax advice. The rules on basis, improvements, and the home sale exclusion have conditions and limits. Consult a licensed tax professional about your specific situation, and see IRS Publication 523 for the current details.
Common Questions
Cost basis, answered
What is cost basis on a home?
It is generally what you paid for the home plus certain purchase costs. Add the cost of capital improvements over the years and you get your adjusted basis. When you sell, your taxable gain is roughly the sale price minus that adjusted basis, so a higher basis means a lower potential gain.
What counts as a capital improvement versus a repair?
An improvement adds value, extends the home's life, or adapts it to a new use, like a new roof, an addition, or a remodel. Repairs and routine maintenance that keep the home in working condition, like fixing a leak or repainting, do not add to basis. Repairs done as part of a larger remodel can count.
Why does cost basis matter if there is a capital gains exclusion?
The exclusion can exempt up to 250,000 dollars of gain for a single filer and 500,000 dollars for a married couple filing jointly, if you qualify. In strong markets, gains can exceed those limits, especially for long-time owners. A documented basis lowers the gain that counts, keeping you under the limit or reducing what is taxed above it.
What records should I keep for home improvements?
Keep receipts and invoices, contracts, permits, and before and after photos for every capital improvement, with the date and amount. Store them somewhere you will still have them years from now. A simple running log plus a folder of receipts is enough.
New Homeowner Resources
Everything after closing, in one place
The full set of guides we keep for our buyers. Start with the checklist, then work through the rest as you settle in.
Still in your corner
Keep the log. We will use it when you sell.
When you are ready to sell one day, bring us the record of what you put into the home. We will make sure it works in your favor and loop in your tax professional.
Part of our new homeowner resources.