Educational overview for homeowners and families
Example used throughout: a $1,000,000 home originally purchased for $250,000
Many California homeowners, especially baby boomers, widows, and widowers, are thinking about selling, downsizing, or passing a home to the next generation. A common concern is capital gains tax on decades of appreciation. One of the most powerful (and often misunderstood) tax rules that can change the math is the step-up in basis.
This article explains the concept in plain language using the numbers from a typical California home. It is for educational purposes only and is not tax, legal, or financial advice. Always consult a qualified CPA or estate attorney for your specific situation.
What Is Cost Basis?
Your cost basis is the starting point for calculating capital gains when you sell real estate. In simple terms:
- Purchase price (original amount paid to acquire the property)
- Plus documented capital improvements (remodels, additions, new roof, etc. that add value)
- Equals your basis
That number is used to compute taxable gain (or loss) on a sale. Routine repairs and maintenance generally do not increase basis; capital improvements do. Keep good records.
Selling During Your Lifetime: The Lifetime Appreciation Problem
If the original owner sells while still alive, the lifetime gain is generally subject to capital gains tax. The Section 121 primary residence exclusion can exclude up to $250,000 of gain for a single filer or $500,000 for a married couple filing jointly, provided the ownership and use tests are met.
Example
- Original basis: $250,000
- Current fair market value: $1,000,000
- Lifetime gain: $750,000
After the Section 121 exclusion:
- Single: roughly $500,000 taxable
- Married filing jointly: roughly $250,000 taxable
In a high-income year caused by the sale, combined federal and California tax on the taxable portion can be substantial (often in the 30%+ range depending on the exact facts). Many homeowners feel trapped by this math when they want to cash out for retirement or downsize.
A Powerful Reset at Death: Step-Up in Basis
Under Internal Revenue Code Section 1014, when property is inherited, the tax basis is generally stepped up (or down) to the fair market value on the date of the owner’s death. Key results:
- Lifetime appreciation is erased for income-tax purposes.
- Heirs start with a new basis equal to current value.
- Selling shortly after inheritance often produces little or no capital gain.
- The rule applies to real estate, stocks, and most capital assets.
A professional appraisal of the home as of the date of death is strongly recommended. In California, the difference can easily be hundreds of thousands of dollars. A $500–$600 appraisal is inexpensive insurance if the IRS ever questions the numbers. Zillow screenshots are not reliable evidence.
Side-by-Side Comparison ($1M Home / $250k Purchase)
Scenario | New Basis | Sale Price | Gain Before Exclusion | After §121 (approx.) |
|---|---|---|---|---|
Sell while alive | $250,000 | $1,000,000 | $750,000 | ~$500k taxable (single) / ~$250k (married) |
Inherit & sell | $1,000,000 | $1,000,000 | $0 | Little or no taxable gain |
If the heirs later live in the home and sell it after further appreciation, the Section 121 exclusion can still apply to post-inheritance gain if they meet the tests.
California’s Community Property Advantage
California is a community property state, and how title is held matters a great deal when one spouse dies.
Community property (or community property with right of survivorship)
When one spouse dies and the home is held as community property, both halves generally receive a full step-up in basis to fair market value (IRC §1014(b)(6)). The surviving spouse’s basis in the entire home becomes the current value. A future sale at that value produces little or no gain. This is often called a “double step-up.”
Joint tenancy (common trap)
Only the deceased spouse’s half steps up. The survivor’s half keeps the old basis. Result: roughly half the lifetime gain remains taxable.
Practical takeaway
If you currently hold title as joint tenants, consider moving the property into a properly funded revocable living trust that preserves community property character. A trust also helps avoid probate. Title is public record; a title company or your real estate professional can usually confirm how you currently hold the home at no cost.
Heirs Receive the Step-Up
When the owner dies and the home passes to children (by will, trust, or intestacy), the children generally receive a stepped-up basis equal to fair market value at the date of death.
On the $1,000,000 home example:
- Children’s new basis: $1,000,000
- If they sell immediately for $1,000,000 → taxable gain = $0
- If the home appreciates further after inheritance, only the post-death gain is taxable
- The primary residence exclusion (Section 121) may also apply later if they live in and sell the home
What California Homeowners Should Know
- Title matters. Community property (or community property with right of survivorship) is usually far better for basis than joint tenancy.
- Trusts & probate. A properly funded revocable living trust can provide the step-up while avoiding probate. The character of the property still controls the basis result.
- Document improvements. Keep records of capital improvements. They raise basis during life and can still matter if there is post-death appreciation.
- Separate from Prop 13 / Prop 19. Step-up is an income-tax rule. Property-tax reassessment under Proposition 19 is a different issue that can still apply to inherited homes.
Important Notes
Tax rules are complex and depend on specific facts: how title is held, character of the property, estate size, residency, and more. This overview is for educational purposes only and does not constitute tax, legal, or financial advice. Consult a qualified CPA or estate attorney for your situation.
Questions about protecting your equity or planning for the next generation?
Darel Ison | CA DRE #02110347
858.229.1625 • [email protected]
abundantpathhomes.com
Abundant Path Homes is a veteran-owned real estate company serving San Diego County. We regularly help homeowners and families understand title, trusts, and the practical side of step-up in basis, and we can connect you with trusted title companies and estate-planning attorneys.
