How Much Capital Gains Tax Will I Owe If I Sell a Culver City Home I've Owned for 30 Years?

It depends on four things: what you paid, what you put into the house, what it sells for, and whether you file alone or with a spouse. For most longtime owners the answer is smaller than the number they have been afraid of, because the first $250,000 of gain on your main home (or $500,000 for a married couple filing jointly) can be left out of your income. Past that amount, the rest of the gain is taxable.

I work with a lot of homeowners who have lived in the same Culver City or Los Angeles home for 30 or more years. The capital gains tax fear is usually the thing that stops them from even finding out what their home could be worth. Before moving on, this is not tax advice. It is how the rules work in plain words, so you know what to ask your CPA.

The gain is what you sell for, minus your costs of selling, minus something called your basis. Basis is the part people do not know to look for. It starts with what you paid for the house, and a few things get added to it over the years.

Improvements you made. This is where keeping receipts matters. A new roof, an addition, a new bathroom, a kitchen remodel, new systems, landscaping, the IRS counts these as improvements that raise your basis. Painting, fixing a leak, and patching a crack are regular maintenance and do not count. If you can show what you spent on the bigger projects, those dollars are added to your tax basis. If you cannot prove it, they are difficult to count.

Closing costs from when you bought. Some of the costs on your original escrow statement get added to your basis too, like title insurance, recording fees, legal fees, and transfer taxes. Others do not, like loan points and homeowner’s insurance. If you can dig out the closing papers from the year you bought, get those out.

Closing costs from when you sell. These work the other way. Your agent’s commission, title and escrow fees, and other costs of selling come off the sale price before the gain is figured.

Put together, the IRS describes it this way: selling price, minus selling expenses, minus adjusted basis, equals gain. The IRS explains the details in Topic 701, Sale of your home and in Publication 523.

Here is what this means in plain English: every documented dollar of improvements or buying costs lowers your gain by a dollar, so after 30+ years of homeownership, those dollars can add up.

Up to $250,000 if you file as a single person, or up to $500,000 if you file jointly with your spouse. To qualify, you need to pass two tests in the five years before the sale:

• You owned the home for at least 24 months.
• You lived in it as your primary residence for at least 24 months.

Those two years do not have to be the same two years. Generally, you cannot use this exclusion if you already used it on another home sale in the two years before this one.

Someone who has lived in a Culver City home for 30 years clears both tests easily. The people who get caught are the ones who moved out years ago and kept the house, which is worth checking before you list.

California has its own rules for the state side of a home sale. I am not the right person to work those out for you, and they depend on your whole tax picture that year. Your CPA can tell you how they apply, and the Franchise Tax Board’s page on selling your home is the official place to look.

These are round numbers I made up to explain the steps. They are not from a client, and they are not a promise about your house.

Say a couple bought their house in 1980 for $250,000, and it sells in 2026 for $2 million. Over those years, they replaced the roof twice, replaced the HVAC system, put in a pool, and added on to the house. They kept the receipts. Here is how the project costs add up in this example:

• Two roofs: $40,000
• HVAC system: $18,000
• Pool: $90,000
• Addition: $120,000

That is $268,000 of improvements. Their original escrow statement from 1980 also shows $3,000 of title, recording, and legal fees. They pay $100,000 in commission and other selling costs when they sell.

Their basis: $250,000, plus $268,000 of improvements, plus $3,000 of buying costs, is $521,000.

Their sale, after selling costs: $2,000,000 minus $100,000 is $1,900,000.

Their gain: $1,900,000 minus $521,000 is $1,379,000.

Now say they had thrown out the receipts and could only prove the $250,000 purchase price, which is public record. Their gain would be $1,900,000 minus $250,000, or $1,650,000. That is $271,000 more gain, just because of paper they could not find.

Your CPA decides which projects count and how, so do not use my list as the final word.

This is why keeping receipts matters. They don't change what the house sold for, but they can change how the exclusion gets applied. Your CPA takes it from there, applies the exclusion that fits your situation, and works out any tax.

• You inherited the home. Your starting number can be different from what a purchase price would give you. Ask your CPA how that works for you. I wrote about where to start in selling an inherited home in Los Angeles.
• You moved out a while ago and kept the house. The test looks at the five years before the sale, so check where you stand.
• Part of the house was a rental or a business space. That portion can be treated differently.
• You are widowed. Ask your CPA how the exclusion applies to your situation.

None of these are reasons to panic. They are reasons to ask before you list, not after you are in contract.

Assuming the whole gain is taxed, and deciding not to sell because of it. For most longtime owners, part of it is not.

Throwing away the receipts. The big project from 2004 is the one you will want a record of.

Forgetting the closing statement from when you bought. Some of those fees raise your basis, and it is easy to lose a 30-year-old piece of paper.

Getting the tax answer from a real estate agent. I can explain how the pieces fit and what to ask. The tax math should come from a CPA or tax attorney.

Waiting to call the CPA until you are under contract. By then, most of your choices are already made.

Make a list of the big projects and improvements with receipts, if you have them. Also, if you can find your original closing statement, grab that too. Get a realistic idea of what the house would sell for today. Sit down with your CPA with all of it in hand and ask what the tax would look like. Then decide. We do not have to decide that today.

You can also look at how Proposition 19 affects your property tax if you buy again, since it often comes up in the same conversation.

This post describes how the home sale exclusion generally works, based on IRS Topic 701. Every situation is different. Please confirm the details for your own sale with a licensed CPA or tax attorney.

If you want to know what your home is worth before you talk to your CPA, you can get a sense of what your home is worth today. If you want to talk through the whole move first, reach out here. No pressure, and no obligation.

Nicole Strober is a REALTOR® with Compass in Los Angeles, CA (DRE #02001608) helping longtime homeowners, move-up buyers and families plan and make consequential moves across Culver City, Cheviot Hills, Beverlywood, West Adams, Mid-City, Ladera Heights and the San Fernando Valley.

How much of my home sale profit is tax free?

Up to $250,000 of gain for a single filer, or up to $500,000 for a married couple filing jointly, if you passed the ownership and use tests. Gain above that may be taxable.

Do I pay capital gains tax if I lived in my house for 30 years?

Maybe on part of it. Living there a long time means you pass the tests, but if your gain is larger than the exclusion, the rest can be taxed. Your purchase price, improvements, and selling costs decide how large the gain is.

Does California tax the gain on a home sale?

California has its own rules for the state side. A CPA can show you how they apply to your year.

Do improvements I made years ago count?

Some can. The IRS counts things like a new roof, an addition, a new bathroom, or a kitchen remodel as improvements that raise your basis. Painting and repairs do not count. Keep the receipts if you have them.

Do my closing costs count toward my taxes?

Some do. Certain fees from when you bought, like title insurance, recording fees, and legal fees, can be added to your basis. Costs of selling, like your agent’s commission, come off the sale price. Loan points and insurance premiums are not added.

Who should I ask about my exact tax bill?

A licensed CPA or tax attorney. I can help you understand the pieces and what to bring, but the tax math is theirs.