The House Has Only Ever Been in His Name. When He Dies, It Will Be Hers by His Will, and 40 Years of Gain Will Reset to Zero the Same Day, All of It, Not the Half a Joint Deed Would Have Given Her

If the family home has only ever been titled in one spouse’s name, that deed provides a specific tax break. When the titled spouse dies and the will leaves the house to the survivor, the entire property receives a step-up in basis to its fair market value on the date of death. For tax purposes, decades of capital gains on the house disappear that day, but if the couple had held the house as joint owners, only half would reset.

One Name on the Deed Resets the Entire Basis

Basis is the figure the IRS uses to measure taxable gain by subtracting it from the sale price. It is generally what was paid for the home plus improvements. Inherited property takes a new basis equal to its fair market value at death, and when one spouse owns 100% of the house, the entire basis resets. When spouses hold title as joint tenants with right of survivorship or as tenants by the entirety, the IRS treats each as owning one-half, meaning only the deceased spouse’s half steps up and the survivor keeps the original basis on her half.

IRS Publication 523 shows the joint-owner math. A home with an adjusted basis of $50,000 and a fair market value of $100,000 at death leaves the survivor with a new basis of $75,000. If the same house is titled to one spouse and left to the other by will, the survivor’s basis matches the full fair market value.

That gap widens as prices rise. The S&P CoreLogic Case-Shiller U.S. National Home Price Index rose from 183.994 in October 2016 to 337.306 in July 2026, a gain of about 83.3% in under ten years. A house held for decades has had more time to build that spread.

Where This Rule Sits in Federal Tax Law

Under 26 U.S.C. § 1014(a)(1), the basis of property acquired from a decedent is its fair market value on the date of death. Section 1014(b)(1) applies that rule to property acquired by bequest, devise, or inheritance, which covers a house left by will. The half-only treatment for couples comes from Section 2040(b)(1), which includes just one-half of a “qualified joint interest” in the deceased spouse’s estate. Section 2040(b)(2) defines that interest as property spouses hold as tenants by the entirety, or as joint tenants with right of survivorship when they are the only joint tenants.

Who Benefits and Who Already Gets the Full Reset

The rule matters most for married couples in common-law states. It applies when the home is titled solely to the spouse who dies first and passes to the survivor by will or through a revocable living trust, which Section 1014(b)(2) also covers. Couples in community property states (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin) already get a full step-up on community property under Section 1014(b)(6), as long as at least half of the community interest is included in the decedent’s estate.

How a Surviving Spouse Claims the Higher Basis

1. Get an appraisal. Make it a date-of-death appraisal. If no federal estate tax return (Form 706) is required, Publication 523 sets the basis at the home’s appraised value at the date of death, for purposes of state inheritance or transmission taxes.
2. Confirm no estate tax is due. Estates of people who die in 2026 can exclude up to $15,000,000. On top of that, Section 2056(a) subtracts property passing to a surviving spouse, so including the full house in the estate generally adds no estate tax.
3. Watch the timing. Time any sale. Under Section 121(b)(4), a surviving spouse who sells within 2 years of the death can exclude up to $500,000 of gain, up from $250,000, if the ownership and use tests were met right before the death. That shelters appreciation that builds after death.
4. Report the sale correctly. Gain or loss on inherited property counts as long-term, regardless of how long you held the property.

Traps That Can Wipe Out the Full Step-Up

Waiting too long to change the title can undo the benefit. Suppose a wife deeds her share of the house to her husband; he dies within 1 year, and the house passes back to her. Under Section 1014(e), her basis is then his adjusted basis immediately before death. Retitling a home during a terminal illness gives no step-up on the gifted share.

The order of death also matters. If the spouse whose name is off the deed dies first, none of the house steps up, because she owned none of it. Joint ownership would have reset half. The full reset only helps when the titled spouse dies first.

A house titled in one spouse’s name and left by will goes through probate unless it sits in a revocable trust. Joint title with survivorship skips probate. The survivor’s claim also depends on a will that the owner can change at any time. Most estate messes trace back to a stale beneficiary, a missed form, or an untitled account, which is why we put the full checklist in a free estate planning guide.

For couples considering a title change, the relevant factors are the one-year window in Section 1014(e), state probate costs, and any annual IRS changes to the 2026 exclusion amounts.

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