Step-Up in Basis

When someone inherits an asset — a stock portfolio, a piece of real estate, a business interest — the tax code generally resets the asset's cost basis to whatever the asset was worth on the date of the original owner's death. If the asset had appreciated significantly over many years, that embedded gain simply disappears for income-tax purposes. The heir can sell immediately and owe little or no capital gains tax on decades of growth.

For families with substantial wealth, the step-up is often one of the most powerful planning tools available — not because of anything they actively do, but precisely because of what it undoes. Consider a hypothetical founder who purchased private land for an illustrative $500,000 decades ago; at death, the land is worth an illustrative $8 million. Heirs who inherit it receive a basis of $8 million, not $500,000.

A common confusion is conflating the step-up with the estate tax. The two operate on different tracks: the estate tax may apply to the asset's full value at death, while the step-up affects the income-tax basis for the heir going forward. Both can apply to the same asset simultaneously. Families exploring concentrated stock positions or long-held real estate often weigh this dynamic carefully with qualified tax counsel.