California Couples Who Owned Their Home for Decades May Get a Full Tax Basis Reset at the First Spouse’s Death

A California couple buys a modest home in 1984, sees it grow into a seven-figure asset, and then one spouse dies. What comes next for the tax bill often surprises surviving spouses who assume decades of appreciation will trigger a large capital gains bill.

Many California couples who bought modest houses in 1984 never moved, and four decades of appreciation turned those starter homes into seven-figure properties. The surviving spouse often expects a sale to create a large capital gains tax burden.

If the home is community property, the community property step-up in basis resets both halves of the property at the first spouse’s death, eliminating most of the gain. National prices remain at record levels, with a leading home-price index at 337.3 in July 2026, so the dollar amounts involved continue to rise.

How Both Halves Get a Fresh Starting Point

Basis is the amount the IRS subtracts from your sale price to calculate taxable gain. For a home, it begins with the purchase price plus improvements. Under 26 U.S.C. § 1014(a), property acquired from a decedent takes a basis equal to its fair market value on the date of death. That reset is commonly called a step-up.

The community property rule appears in 26 U.S.C. § 1014(b)(6), which treats the surviving spouse’s one-half share of community property as acquired from the decedent, as long as at least half of the community interest is included in the decedent’s gross estate. IRS Publication 523 says that when either spouse dies, “the total fair market value of the community property becomes the basis of the entire property, including the part belonging to the surviving spouse,” whether or not the estate must file a return.

What a Common Law State Leaves on the Table

For a jointly owned home in a common law state, only the deceased spouse’s half receives a new basis, while the survivor’s half keeps its old basis, according to IRS Publication 523. For example, assume the house cost $100,000, was worth $1.5 million at death, and sold for that amount soon afterward.

Selling costs and any price changes after death would alter those figures. That is why a community property survivor usually ends up with almost no gain, rather than exactly zero.

Who Qualifies and Who Gets Left Out

The IRS lists nine community property states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. The home must actually be community property. Property owned by one spouse before marriage or inherited property generally counts as separate property.

Title also matters. California couples who hold title as joint tenants may receive a step-up only on the deceased spouse’s half. California also recognizes community property with right of survivorship, which combines the full step-up with automatic transfer to the survivor.

Many retirees have moved out of California. Community property acquired while living there generally keeps that character after a move, and some common law states have adopted the Uniform Disposition of Community Property Rights at Death Act to recognize it at death. A few common law states also allow couples to opt in through a community property trust, and Tennessee is one example. Whether the IRS accepts the double reset for these trusts is less certain.

Steps That Secure the Full Reset

1. Pull the deed and read the vesting line to see how title is held.
2. If the home is held in joint tenancy but was bought with community funds, ask an estate attorney licensed in your state whether retitling makes sense.
3. After a death, order an appraisal as of the date of death. If no estate tax return is required, IRS guidance points to the appraised date-of-death value.
4. Check the home-sale exclusion. A surviving spouse who sells within two years of the death and has not remarried may exclude up to $500,000, compared with $250,000 for a single filer under 26 U.S.C. § 121(b). After a double reset, the exclusion often goes unused. In the joint tenancy example, it would still leave $200,000 of taxable gain.

Resets Cut Both Ways

Section 1014(a) resets basis to fair market value in whichever direction that moves it. If a community asset is worth less than its basis at death, both halves step down, and the survivor loses any built-in loss she might otherwise have deducted. The rule covers the full value of the community property, so a community brokerage account also resets entirely. Gains disappear on winners, and losses disappear on losers. Before anything else, pull the deed and confirm how title is actually held.