Capital Gains Tax on Your Los Angeles Home Sale: What the Section 121 Exclusion Covers

How much capital gains tax do you pay when selling a home in Los Angeles?

When you sell your primary residence in Los Angeles, you can exclude up to $250,000 in capital gains ($500,000 if married filing jointly) under IRS Section 121, provided you've owned and lived in the home for at least two of the past five years. Gains above that exclusion are taxed federally at 0%, 15%, or 20% (plus a 3.8% surcharge for high earners), and California treats all capital gains as ordinary income at up to 13.3%. For LA sellers near or above the Measure ULA thresholds, the ULA transfer tax counts as a selling expense that reduces your taxable gain.

By Paul Blair | August 13, 2026

The moment a lot of LA sellers realize they have a problem is when they meet with their CPA and find out that the house they bought in 2005 for $700,000 is now worth $2.8 million. The math on that gain is not simple, and the number that comes out the other side can be jarring.

This post walks through exactly how capital gains tax works on a home sale in Los Angeles. It won't replace a conversation with your tax advisor for your specific situation. But it will give you the framework so that conversation is a lot more productive.

How capital gains are calculated on a home sale

The tax isn't on the sale price. It's on your gain, which is the difference between what you sell for and your adjusted cost basis.

Your cost basis starts with what you paid for the home. To that you can add the cost of any capital improvements you've made over the years: a new roof, an addition, a kitchen remodel, new windows, a pool, a seismic retrofit. These additions reduce your taxable gain, so keeping records of major projects matters. If you ever rented the property, any depreciation you claimed will reduce your basis, increasing your gain.

If you bought a Hollywood Hills home for $850,000 in 2010 and spent $200,000 on a renovation, your adjusted basis is $1,050,000. If you sell for $3.2 million, your gain is $2.15 million. That's the number you're working with before any exclusion.

Here's how that plays out across a few LA scenarios:

In every one of these cases, the $250,000 or $500,000 exclusion covers only a fraction of the gain.

The Section 121 exclusion and what California does with the rest

IRS Section 121 gives homeowners a meaningful tax break when they sell a primary residence. You can exclude from federal income tax up to $250,000 in gains if you're a single filer, or up to $500,000 if you're married and file jointly.

To qualify, you need to pass two tests:

• Ownership test: You owned the home for at least two of the five years before the sale.
• Use test: You lived in the home as your primary residence for at least two of the five years before the sale.

The two years don't need to be consecutive. They just need to total 24 months within that five-year window. You can generally claim this exclusion only once every two years.

California conforms to Section 121. The exclusion applies to both your federal return and your California state return. The state doesn't offer a separate exclusion beyond this.

Federal rates on gains above the exclusion

Once you subtract the exclusion, the remaining gain is subject to federal long-term capital gains tax. The rates depend on your taxable income:

• 0% for lower-income filers
• 15% for most middle- and upper-income filers
• 20% for the highest earners

High-earning sellers also owe the 3.8% Net Investment Income Tax (NIIT), bringing the federal maximum to 23.8% on gains above the exclusion.

If you held the property for less than 12 months, the gain is treated as ordinary income at your federal marginal rate, which can be considerably higher.

California's approach: ordinary income, no preferential rate

California does not offer a lower rate for long-term capital gains. The state taxes all capital gains as ordinary income, subject to your marginal state rate. That rate runs from 1% to 13.3% (12.3% top bracket, plus a 1% Mental Health Services surcharge on income over $1 million).

The practical result: for a top-bracket California seller, the combined federal and state tax on gains above the Section 121 exclusion can reach approximately 37%. On $1.65 million in taxable gain (above the $500K exclusion), that's a potential tax bill approaching $610,000.

This is why the tax conversation is worth having before you decide to list, not after you've already signed a listing agreement. What you net from a home sale in Los Angeles isn't the sale price minus the mortgage balance. There are several layers between the gross sale and what lands in your account.

How Measure ULA fits in

If you're selling in the City of Los Angeles and your sale price crosses the ULA thresholds (approximately $5.4 million at 4%, or $10.9 million at 5.5%, indexed annually), you as the seller typically pay that transfer tax at closing.

Here's the interaction that matters: Measure ULA is generally treated as a selling expense, which reduces the amount you "realized" from the sale. That reduces your taxable gain by the amount you paid in ULA.

On a $7 million sale, you'd owe $280,000 in ULA (4% of $7M). That $280,000 is subtracted from your gain before you calculate the capital gains tax. You're still paying both taxes, but you're not paying full capital gains rates on the same dollars you already paid in transfer tax.

It doesn't make ULA feel small. But the two obligations aren't completely stacked the way some sellers assume.

Los Angeles neighborhoods with the most dramatic appreciation since 2005 are also the ones where the taxable gain is most likely to exceed the Section 121 exclusion by a wide margin.

Situations that change how the exclusion works

Partial exclusion for qualifying events. If you haven't hit the two-year mark, you may still qualify for a reduced exclusion if you're moving for a specific reason: a job relocation to a worksite at least 50 miles farther from your home than your prior job, a health-related move, or an "unforeseen circumstance" as defined by the IRS. The exclusion is prorated — number of qualifying months divided by 24, multiplied by the full exclusion amount. A single seller who owned and lived in the home for 15 months for a qualifying reason could exclude up to $156,250. A divorce situation may also qualify, depending on who owned and lived in the home and when the sale closes.

Death of a spouse. If your spouse died and you haven't remarried, you may qualify for the full $500,000 exclusion if you sell within two years of the death, provided the standard ownership and use tests are met.

You've already used the exclusion. Section 121 is generally available once every two years. If you sold another primary residence and claimed the exclusion within the past two years, you likely can't use it again on this sale.

A converted rental. If you lived in the home as a primary residence, then rented it out for a period, and then moved back in before selling, the calculation gets more involved. Under IRS rules, gain attributable to periods of non-qualifying use after January 1, 2009 is not eligible for the exclusion. Additionally, any depreciation you claimed during the rental period is subject to "recapture" at a 25% federal rate, separate from the standard capital gains calculation. If your home has had any rental history, bring it up with your CPA before you list.

The timing question. The two-year mark matters. If you're 18 months into living in a home and considering a sale, waiting until you cross that threshold can protect the full exclusion. On a home with $1 million in gain, timing the sale by a few months could save more than $100,000 in combined taxes. The tax tail shouldn't drive every decision, but when timing is genuinely flexible, the math is worth reviewing.

Thinking through the sale of your Hollywood Hills, Westside, or Beverly Hills home and trying to understand what you'll actually net after taxes and Measure ULA? Request a confidential valuation from Paul Blair at Grey Square. The estimate is free, and it gives you a concrete starting point for the tax conversation with your CPA. Request a confidential valuation

Frequently Asked Questions

How long do I need to live in my Los Angeles home to avoid capital gains tax?

You need to have owned the home and used it as your primary residence for at least two of the five years immediately before the sale. The two years don't need to be consecutive, just need to total 24 months within the five-year lookback window. If you meet the test, you can exclude up to $250,000 in gains ($500,000 if married filing jointly) from both your federal and California tax returns.

Can I still use the Section 121 exclusion if my gain is over $500,000?

Yes. The exclusion applies to the first $500,000 of your gain (or $250,000 if single), and you pay capital gains tax on whatever is above that amount. In LA, where a home bought for $700,000 two decades ago might sell for $3 million or more, gains frequently and significantly exceed the exclusion ceiling.

Does Measure ULA reduce my capital gains in Los Angeles?

In most cases, yes. Measure ULA is a transfer tax paid by the seller, and transfer taxes are generally treated as a selling expense that reduces your amount realized from the sale. That in turn lowers your taxable gain by the amount of ULA paid. The practical effect: you pay full capital gains rates only on your net gain after subtracting the ULA. Confirm the specific treatment with your CPA, since individual circumstances vary.

What happens if I rented my home for a few years before selling?

If you rented the property and then moved back in, gain attributable to the rental period after January 1, 2009 is not eligible for the Section 121 exclusion under IRS rules. In addition, any depreciation you claimed during the rental period is recaptured and taxed at 25% federally. The calculation is substantially more complex than a straightforward primary residence sale, and you'll want a CPA involved early.

Who's the right real estate agent for a high-value home sale in Hollywood Hills or the Westside?

For long-term owners with significant appreciation, you want an agent who understands how to structure the timing and presentation of your sale in a way that works with the tax conversation, not against it. Neighborhood-level experience matters: pricing dynamics in the Bird Streets are different from the flats of Beverly Hills, which are different again from Laurel Canyon. Paul Blair has worked with sellers across the Hollywood Hills, Bel Air, Brentwood, Santa Monica, and the broader Westside for more than 22 years, with over $200 million in closed transactions. If you're weighing timing, pricing strategy, and net proceeds on a complex sale, that's a conversation worth having before you commit to a list date. Connect with Paul here

If you're selling a Hollywood Hills estate, a Westside home, or any City of Los Angeles property with substantial appreciation, the capital gains calculation is a real number that deserves real attention before you list. Request a confidential valuation at greysq.com/home-value and let's map out what your net looks like from sale price to your account.

About Paul Blair

Working with sellers across the Westside and Hollywood Hills, the capital gains question comes up in almost every listing conversation for long-term owners, and it's always one worth slowing down for before the sign goes in the yard.

Paul Blair is the founder and broker of Grey Square, a virtual real estate brokerage representing buyers and sellers across Dallas and Los Angeles. With 22 years in the business and more than $200 million in closed transactions, Paul works the full range of the market, from luxury homes in the Park Cities and Preston Hollow to estates in the Hollywood Hills and across the Westside. Connect with Paul and the Grey Square team at greysq.com. TX TREC #9011505. CA DRE #01792671.