Capital Gains Tax on Inherited Property: What Real Estate Agents Must Know

Your seller just inherited a house their parents bought for $45,000 in 1978. The Zestimate says $620,000. They're convinced they owe capital gains tax on half a million dollars of profit — and they're panicking about whether it's even worth selling.

This is the conversation real estate agents handling inherited properties face constantly. The good news: the stepped-up basis rule almost always makes the tax picture far better than sellers expect. The bad news: most agents can't explain why, which means they can't calm their clients down or set realistic expectations about net proceeds.

How the Stepped-Up Basis Works

When someone inherits property, the IRS generally adjusts the cost basis to the fair market value on the date of the owner's death. This can be an increase or a decrease; the original purchase price is generally no longer the basis for capital gains calculations.

That $45,000 house from 1978? If the owner died when it was worth $600,000, the heir's basis is $600,000. If they sell it for $620,000, they owe capital gains tax on $20,000 — not $575,000.

This applies to all inherited property regardless of how long the decedent owned it. It doesn't matter whether the property was held for two years or forty. The stepped-up basis eliminates the accumulated appreciation that occurred during the decedent's lifetime.

For real estate agents, this changes the conversation from "how much tax will I owe" to "how quickly should we sell." Because the closer the sale price sits to the date-of-death value, the smaller the taxable gain.

Establishing the Date-of-Death Valuation

The date-of-death appraisal is the foundation of the entire tax calculation. Without it, heirs have no defensible basis if the IRS ever questions the sale.

Personal representatives should order a retrospective appraisal from a licensed appraiser who can provide a valuation as of the exact date of death. This isn't the same as a standard listing CMA — it needs to meet USPAP standards and use comparable sales data from around the death date, not current market conditions.

The executor can alternatively elect the "alternate valuation date," which is six months after death, but only if it reduces both the total estate value and the estate tax liability. This election is primarily relevant for estates large enough to trigger federal estate tax (the 2026 threshold is $15 million per individual).

As the listing agent, your role isn't to prepare the tax appraisal — that's the CPA's and appraiser's domain. But you should know enough to flag timing issues. If the property has appreciated significantly since the date of death, a faster sale reduces capital gains exposure. If property values have dropped, a delayed sale might actually generate a deductible loss.

Federal Estate Tax vs. Capital Gains Tax

These are two separate taxes that confuse sellers and agents alike.

Federal estate tax applies to the total value of a decedent's estate — all assets, not just real property. The 2026 basic exclusion is $15 million per person. A surviving spouse may also use a deceased spouse's unused exclusion through a timely portability election, potentially bringing a couple's combined exclusion to $30 million. Fewer than 0.1% of estates owe any federal estate tax at all. Most inherited property sales involve zero estate tax.

Capital gains tax is what heirs pay on appreciation that occurs after they inherit the property. Thanks to the stepped-up basis, this is typically modest if the property sells within a year or two of death.

State-level estate and inheritance taxes are a different matter. About a dozen states impose their own estate taxes with much lower thresholds — Maryland's kicks in at $5 million, Oregon's at $1 million. A handful of states (Kentucky, Maryland, Nebraska, New Jersey, Pennsylvania) also impose inheritance taxes based on the heir's relationship to the decedent, regardless of the estate's total size.

Practical Implications for Listing Agents

Understanding the tax landscape shapes how you advise the personal representative on timing and pricing.

Sell quickly to limit post-death appreciation. The longer heirs hold the property, the more post-death appreciation they accumulate — and that appreciation is generally taxable. A property inherited when it was worth $500,000 that sells two years later for $560,000 generates $60,000 in gain before allowable adjustments and expenses.

Document everything. Recommend that the personal representative keep the date-of-death appraisal, the closing statement, and all improvement receipts in a single file. Capital improvements made after inheritance (a new roof, HVAC replacement) add to the basis and reduce the taxable gain.

Know your scope boundaries. Real estate agents should never calculate tax liability or advise on tax strategy. Your job is to understand the framework well enough to have informed conversations and to refer clients to a CPA or tax attorney for specific calculations. Telling a seller "you probably won't owe much in capital gains because of the stepped-up basis" is appropriate. Telling them "you'll owe exactly $4,200" is practicing tax advice without a license.

Multi-Country Considerations

United Kingdom: For Capital Gains Tax, inherited property is generally treated as acquired at market value on the date of death, rather than at the decedent's original cost plus an indexation allowance. The annual CGT exemption for individuals and personal representatives is £3,000 for 2026–27. Inheritance Tax may also apply: the standard nil-rate band is £325,000, and qualifying estates may get up to an additional £175,000 residence nil-rate band. The estate rate is generally 40% on taxable value above applicable thresholds, subject to exemptions and reliefs; IHT must be paid before probate is granted.

Australia: A full CGT exemption may apply if the inherited property was the decedent's main residence and is disposed of within two years of death; generally, it must not have been used to produce income just before death, and other conditions apply. An investment property's cost base is not automatically reset to market value at death: if the deceased acquired it on or after 20 September 1985, the cost base generally carries over. A 50% CGT discount may be available after a qualifying 12-month holding period.

Canada: Canada generally treats death as a deemed disposition at fair market value, with the gain reported on the deceased's final tax return. Subject to exceptions such as qualifying transfers to a spouse, heirs generally take that fair market value as their cost base; later appreciation is taxed when the property is sold.

What This Means for Your Next Estate Listing

Most heirs overestimate their capital gains exposure by an order of magnitude. As the listing agent, you're often the first professional to explain that the stepped-up basis eliminates decades of accumulated appreciation from the tax equation.

That clarity builds trust, reduces decision paralysis, and moves the transaction forward. For a complete protocol covering fiduciary verification, disclosure requirements, and commission safeguards in deceased estate sales, the Real Estate Agent's Deceased Estate Property Guide walks through every phase of these transactions.