When a parent dies and leaves behind a house purchased decades ago or a stock portfolio built over a lifetime, the heir who sells that property can often owe zero capital-gains tax on all the appreciation that occurred before the death. The mechanism is a single provision of the tax code, current through May 2026, that resets the heir’s cost basis to fair market value on the date of death. For a home bought at $80,000 that is worth $500,000 when the owner dies, the entire $420,000 gain simply disappears from the tax calculation the moment the heir takes ownership.
How Section 1014 Erases Pre-Death Appreciation
The rule sits in Section 1014 of the Internal Revenue Code, which provides that the basis of property acquired from a decedent is generally the fair market value at the date of death. That single reset wipes out any taxable gain that accumulated while the original owner held the asset. The IRS explains in Publication 551 that inherited property usually takes a basis equal to its value on the decedent’s date of death, whether the asset is a family home, publicly traded shares, or farmland. When the heir later sells, the gain or loss is simply the sale price minus that stepped-up figure, as the capital-gain mechanics in Publication 544 make clear.
A home held for 30 years and a stock position held for the same period both qualify for the reset. But the two asset classes behave differently after the step-up takes effect. Publicly traded stock has a clear, verifiable market price on any given date, so the stepped-up basis is straightforward to establish from brokerage records. A primary residence, by contrast, requires an appraisal, and the valuation of illiquid real property can involve discounts for condition, location, or marketability that do not apply to exchange-listed securities. That gap creates room for larger effective tax savings on inherited homes when the appraisal lands conservatively relative to the eventual sale price.
Consider two siblings who inherit equal shares of their late mother’s estate: one receives a basket of blue-chip stocks worth $500,000, the other receives the house, also appraised at $500,000. If both sell a year later for $550,000, each has a $50,000 long-term gain. But the stock heir’s gain is measured against an objective market quote on the date of death, while the home heir’s gain depends on a professional judgment that might reasonably have come in at $475,000 or $525,000. A lower, well-supported appraisal at death translates directly into a larger tax-free cushion for the eventual sale.
Basis Consistency Rules and the IRS Reporting Regime
Congress added a guardrail after 2015 to prevent heirs from inflating their basis above the value reported on the estate tax return. Under Treasury Regulation 1.1014-10, heirs generally cannot claim a basis higher than the estate-tax value for covered property. Executors must file Form 8971 and Schedule A to report those estate values directly to each beneficiary, creating a paper trail that the IRS can match against later income-tax returns. Internal Revenue Bulletin 2016-12 details how these consistency requirements work alongside penalty provisions under Sections 1014(f) and 6662(k) when a taxpayer overstates basis.
The consistency mandate ties the heir’s basis to whatever figure the estate used for federal estate tax purposes, as reinforced by the general valuation rule in Treasury Regulation 1.1014-1. In practice, that means the critical tax planning decisions now occur at the estate-administration stage: the executor’s choice of appraiser, the documentation supporting any valuation discounts, and the timing of alternate valuation dates all lock in the numbers that beneficiaries must later use. For heirs, the days of quietly picking a higher “ballpark” basis years after the funeral are largely over.
These rules do not eliminate the power of the step-up, but they channel it through formal reporting. Families who expect to leave significant real estate or closely held business interests need to understand that lowball appraisals can backfire if the estate is taxable, while overly aggressive high values reduce the very capital-gains shield Section 1014 offers. Getting the valuation right the first time is now the key to ensuring that decades of pre-death appreciation truly vanish from the capital-gains calculation when property changes hands at death.
