Step-Up in Basis on an Inherited California Home: Why You May Owe $0 in Tax

by Dar Mardan

Watch the full breakdown in the video above.

Do you pay capital gains tax when you sell an inherited house in California?
Usually little or none. Under the step-up in basis, your tax basis resets to the home's value on the date of death, so only growth after that date is taxed.

If your parents bought their Orange County home decades ago, the gain on paper can be enormous. A house bought for $1,000,000 that is worth $4,000,000 today carries $3,000,000 of built-in gain. Sell it the wrong way and federal and California tax can take more than $1,000,000. Inherit it the right way and the tax on that same sale can be $0.

The rule that makes the difference is the step-up in basis. It is one of the most valuable provisions in the tax code for families, and one of the easiest to lose. In this guide I'll walk you through how it works, the gifting mistake that destroys it, and the California deed issue that decides whether a surviving spouse gets half of the step-up or all of it.

I'm writing this as a CPA and a REALTOR. Most of what goes wrong with inherited homes in Newport Beach, Irvine and the rest of Orange County isn't a real estate problem. It's a tax problem that shows up at the closing table.

What Is the Step-Up in Basis?

Your basis is what the IRS treats as your cost in a property. When you sell, your taxable gain is the sale price minus your basis (and minus selling costs). Normally your basis is what you paid, plus the cost of improvements.

Inheritance changes that. Under Internal Revenue Code Section 1014, the basis of property you receive from someone who has died becomes its fair market value on the date of death. The IRS confirms this in its gifts and inheritances FAQ and in Publication 551, Basis of Assets.

What that means in plain terms:

Every dollar the house gained while your parents owned it is never taxed, not to them and not to you.
Your new starting point is the date-of-death value.
You only pay tax on growth after that date.

That is why so many heirs who sell within a few months of inheriting show almost no gain. After commissions and closing costs, many actually show a small loss.

Inherited homes are automatically long-term

There's a second benefit people miss. Inherited property is treated as held for more than 1 year, even if you sell it a month after inheriting. So any gain that does exist is taxed at long-term capital gains rates, not short-term rates.

The Most Important Step: Get a Date-of-Death Appraisal

The step-up only helps you if you can prove the value. That number becomes your basis, and it's what you'll defend if the IRS ever asks.

Use a licensed appraiser and ask for a retrospective appraisal as of the exact date of death.
Don't rely on the county's assessed value. In California, assessed value is often a fraction of market value because of Prop 13. Using it would throw away most of your step-up.
Don't rely on an online estimate. A Zillow number is not evidence of value.
Do it early. Recent comparable sales are easiest to document right after the date of death. Waiting years makes the appraisal harder to support.

If the estate is large enough to file a federal estate tax return (Form 706), the value reported there generally becomes your basis, and the executor may send you a Schedule A to Form 8971 reporting it. For most families, no estate return is filed, and the appraisal is your proof.

If you're still sorting out what happens after a parent passes, start with our guide on what to do next when you inherit a house in California.

The Mistake That Destroys the Step-Up: Gifting the House Early

Some parents try to be helpful and put the house in their kids' names while they're still alive. It feels like planning ahead. For tax purposes, it can be the most expensive decision the family makes.

A transfer during life is a gift, not an inheritance, and gifts don't get a step-up. The child takes the parents' original basis, called carryover basis. All of the built-in gain comes with the house.

Using our example: if your parents gift you a home they bought for $1,000,000, your basis is $1,000,000. Sell it at $4,050,000 and you're taxed on roughly $3,050,000. If you inherit that same home instead, your basis is $4,000,000.

A revocable living trust is different. Because your parents keep control of the property until death, the home is included in their estate and still gets the step-up. That's one reason trusts are so common in California. Our guide to selling a house in a trust walks trustees through the sale, and this post on trusts versus probate in Orange County explains why the trust route is usually faster.

Irrevocable trusts are another matter. Assets in an irrevocable trust that aren't included in the grantor's estate generally don't get a step-up. If your parents have one, have their estate attorney and CPA confirm how it's treated before anyone plans a sale.

Real Numbers: $0 Tax vs. More Than $1,000,000

Here is the example from the video, laid out step by step.

Your parents bought a home in Irvine for $1,000,000. When the last of your parents passes, it's worth $4,000,000. You sell it 6 months later for $4,050,000.

	Gifted before death (no step-up)	Inherited (step-up)
Sale price	$4,050,000	$4,050,000
Your basis	$1,000,000	$4,000,000
Gain before selling costs	$3,050,000	$50,000
Estimated federal + California tax	More than $1,000,000	$0 (selling costs likely create a loss)

The estimate on the left assumes a single heir in the top brackets: 20% federal long-term capital gains tax, the 3.8% net investment income tax, and California, which taxes capital gains as ordinary income at rates up to 13.3%. With 2 or 3 siblings splitting the sale, each person's rate may be lower, but the total is still enormous.

On the right, commissions, escrow, title and transfer tax on a $4,050,000 sale typically exceed $50,000 on their own. Our breakdown of what it costs to sell a home in Newport Beach shows the line items, and this Orange County cost-to-sell guide covers the county-wide picture.

Same house. Same family. The only difference is how the house passed to you.

Why How Your Deed Is Titled Can Change Your Tax Bill

This is the part most people have never heard of, and it's specific to California and the other community property states. It applies when a married couple owns the home and the first spouse passes away.

The question is simple: how much of the house gets the step-up? The answer depends on a few words on the deed.

Joint tenancy: only half steps up

With joint tenancy, each spouse is treated as owning their own separate half. When 1 spouse dies, only the half that belonged to the spouse who passed gets the step-up. The surviving spouse's half keeps its original purchase price as its basis.

Community property: the whole house steps up

With community property, both halves get the step-up, not just the deceased spouse's half. This is often called a double step-up. The IRS explains the rule in Publication 555, Community Property: when a spouse dies, the total fair market value of the community property, including the survivor's share, generally becomes the basis of the entire property.

Tenancy in common

Tenancy in common is usually used by non-spouses, like siblings or business partners. Only the deceased owner's share steps up, and there's no automatic right of survivorship, so that share passes by will or trust.

A simple example

Take that same Irvine home. A married couple bought it for $1,000,000, and it's worth $4,000,000 when the first spouse passes.

	Joint tenancy	Community property
Deceased spouse's half	$2,000,000 (stepped up)	$2,000,000 (stepped up)
Surviving spouse's half	$500,000 (original cost)	$2,000,000 (stepped up)
Survivor's total basis	$2,500,000	$4,000,000
Gain if sold for $4,000,000	$1,500,000	About $0

Between federal and California tax, a $1,500,000 gain could cost the surviving spouse around $500,000. If it was the couple's home and the survivor sells within 2 years of the spouse's death, she can generally still claim the $500,000 married home-sale exclusion, which brings the tax down but nowhere near $0. With community property, the gain is close to nothing no matter when she sells.

For rental property, the gap is even wider. The double step-up also wipes out the depreciation taken on the survivor's half, which joint tenancy leaves exposed to recapture.

The best of both: community property with right of survivorship

California offers a title that combines both benefits: community property with right of survivorship (Civil Code Section 682.1). It gets the full double step-up of community property and still passes to the surviving spouse without probate, the same way joint tenancy does. For most married couples holding appreciated property, it's the title to ask about.

What to do now

Pull your deed, or your trust's schedule of assets, and read the exact wording.
If it says joint tenancy and you'd like to change it, talk to an estate planning attorney. Converting joint tenancy to community property requires a specific written declaration, so this isn't a do-it-yourself deed.
Do it while both spouses are living. Trying to prove after the fact that joint tenancy property was really community property is much harder, and it can turn into a dispute with the IRS.

One caveat: the rule cuts both ways. If community property has dropped in value, both halves step down to the lower value. That's rare in coastal Orange County, but it can happen.

Step-Up in Basis vs. Prop 19: Two Different Taxes

Families often mix these up. They are separate rules for separate taxes.

The step-up in basis is a federal (and California) income tax rule. It decides how much capital gains tax you owe when you sell.
Prop 19 is a California property tax rule. It decides whether you keep your parents' low assessed value or get reassessed to market value.

The step-up does nothing for your property tax bill. If you keep the house, Prop 19 generally requires you to move in as your primary residence within 1 year, and there's a cap on how much of the value can carry over. See the California Board of Equalization's Prop 19 page, our guide to the Prop 19 1-year rule for inherited homes, and our deeper look at Prop 19 parent-to-child transfers.

Very often the two rules point in the same direction. If you won't move in, the house will be reassessed under Prop 19, and the step-up means a sale may cost you little or nothing in capital gains tax. That combination is why many heirs decide to sell.

Keep, Rent or Sell the Inherited Home?

The step-up gives you a clean starting point, but it doesn't make the decision for you. Here's how the tax picture shapes each option.

Sell soon: little or no capital gains tax thanks to the step-up. The simplest path when siblings are splitting the proceeds.
Keep and live in it: Prop 19 may let you keep some of your parents' low property tax base if you qualify. Your basis stays at the stepped-up value for a future sale.
Keep and rent it: you start depreciating from the stepped-up value, which can shelter rental income. But the home will likely be reassessed for property tax, and future appreciation will be taxable when you sell.

When heirs disagree about what to do, things can stall quickly. Our post on the inherited home mistake that gets families stuck in court covers how to avoid that, and managing an inherited property in Newport Beach covers the practical side of holding it.

If you're a longtime owner planning ahead instead, our guide to the cost basis problem behind a $4M+ Newport Beach home sale explains how to document your own basis, and the tax side of selling in Newport Beach covers the home-sale exclusion and withholding.

Quick Checklist

Don't gift the house while your parents are alive without running the numbers first.
Get a retrospective appraisal as of the date of death.
If you're married, check whether your deed says joint tenancy or community property.
Remember that Prop 19 is a separate property tax rule. The step-up doesn't fix your property tax bill.
Keep the appraisal, the death certificate, the trust or probate documents and your closing statement together for your tax return.

Frequently Asked Questions

What is a step-up in basis on inherited property?

When you inherit a home, your tax basis resets to its fair market value on the date of death. The appreciation during your parents' lifetime is never taxed.

Do I pay capital gains tax when I sell an inherited house in California?

Only on the gain above the date-of-death value. If you sell soon after inheriting, the gain is usually small, and selling costs often turn it into a loss.

How do I prove the value of an inherited home?

Hire a licensed appraiser for a retrospective appraisal as of the date of death. Don't rely on the county's assessed value or an online estimate.

Does a house gifted before death get a step-up in basis?

No. A gift keeps the parents' original cost basis, so all of the built-in gain passes to the child and is taxed when the house is sold.

Does a house in a revocable living trust get a step-up in basis?

Yes. Property in a revocable living trust is included in the owner's estate, so it receives the step-up at death.

Does a house in an irrevocable trust get a step-up in basis?

Generally not, if the trust's assets aren't included in the grantor's estate. Have an estate attorney and CPA review the trust before planning a sale.

Is an inherited home a short-term or long-term capital gain?

Long-term, automatically. Inherited property is treated as held for more than 1 year even if you sell it a month after inheriting.

What is a double step-up in basis in California?

When a married couple holds a home as community property and the first spouse dies, both halves step up to fair market value, not just the deceased spouse's half.

Does joint tenancy get a full step-up in basis?

No. With joint tenancy, only the deceased spouse's half steps up. The surviving spouse's half keeps its original purchase price as its basis.

What is community property with right of survivorship?

A California form of title under Civil Code Section 682.1. It gets the community property double step-up and still passes to the surviving spouse without probate.

Can we change our deed from joint tenancy to community property?

Usually yes, while both spouses are living, but it requires a specific written declaration. Work with an estate planning attorney rather than recording a new deed yourself.

How much can the wrong deed title cost a surviving spouse?

In our example, a home bought for $1,000,000 and worth $4,000,000 leaves a $1,500,000 gain under joint tenancy, roughly $500,000 in tax, versus about $0 as community property.

Can a surviving spouse still use the $500,000 home-sale exclusion?

Generally yes, if the home was their main residence and they sell within 2 years of the spouse's death without remarrying. After that, the single $250,000 limit applies.

Does the step-up in basis affect my property tax under Prop 19?

No. The step-up is an income tax rule. Prop 19 is a separate California property tax rule that decides whether an inherited home is reassessed.

Is there an inheritance tax in California?

No. California has no state inheritance or estate tax. Only very large estates owe federal estate tax, and the step-up applies whether or not an estate tax return is filed.

Can the basis of an inherited home go down instead of up?

Yes. The rule resets basis to date-of-death value either way. If the home is worth less than the original cost, the basis steps down, which is rare in coastal Orange County.

Should I sell, rent or keep an inherited house?

It depends on whether you'll live in it, your Prop 19 situation, and how siblings want to split it. The step-up often makes a sale soon after death nearly tax-free.

Talk Through Your Numbers Before You Make a Move

Every inherited home is different: the deed, the trust, the siblings, the Prop 19 deadline and the market all matter. I'm Dar Mardan, a CPA and REALTOR® with Vidar Group Real Estate at Real Broker, and together with my wife Vida we help families across Newport Beach, Corona del Mar, Irvine and all of Orange County decide whether to keep, rent or sell an inherited home.

Book a complimentary strategy call or call me directly at 714-612-3870. We'll run your actual numbers before you make a decision.

This article is general education, not tax or legal advice for your situation. Talk to your CPA and estate planning attorney before changing title or selling.