The Step-Up in Basis, Explained

By FiduciaryCalculator Editorial · 7 min read · Updated 2026-06-03

Inheriting an appreciated asset can erase a lifetime of capital gains. Here's why holding until death sometimes beats gifting or selling.

What 'basis' means

Your basis in an asset is generally what you paid for it. When you sell, you owe capital-gains tax on the difference between the sale price and your basis. Buy stock at $200,000, sell it at $1,000,000, and you have an $800,000 gain to be taxed.

The step-up in basis is one of the most valuable provisions in the tax code for families passing down appreciated assets. The Step-Up in Basis Calculator shows how much capital-gains tax it can eliminate.

How the step-up works

When you die, most assets your heirs inherit get their basis 'stepped up' to fair market value as of your date of death. The built-in gain that accumulated during your lifetime simply vanishes for income-tax purposes. If your heir sells the asset right away at that value, there is little or no capital-gains tax.

In our example, the $800,000 of built-in gain disappears entirely if the asset is inherited rather than sold during life — potentially saving roughly $190,000 in tax at a combined 23.8% capital-gains rate.

Why gifting can backfire

Lifetime gifts do not get a step-up. When you gift an appreciated asset, the recipient takes your original basis (a 'carryover' basis) and inherits the built-in gain along with it. So gifting appreciated assets to save estate tax can hand your heirs a large income-tax bill instead.

This is the central tension: removing assets from your estate via gifts can reduce estate tax but forfeits the step-up. For families below the estate-tax exemption, holding appreciated assets until death is often the better answer.

Sell now or inherit?

If you are weighing whether to sell an appreciated asset during life or let heirs inherit it, the calculator compares the after-tax outcomes. Selling now triggers capital-gains tax immediately; inheriting captures the step-up and the gain escapes income tax.

The decision also depends on whether you need the proceeds, whether the asset is still a good investment, and whether your estate is large enough to face estate tax — which can flip the analysis.

Caveats and coordination

Not everything gets a step-up: retirement accounts like traditional IRAs do not, and assets in certain irrevocable trusts may not. Community-property states offer a 'double' step-up on the full value for surviving spouses, an extra advantage worth knowing.

Because the step-up interacts with estate tax, gifting strategy, and state law, coordinate with a CPA and estate attorney before making large moves. The right answer for a $3 million estate can be the opposite of the right answer for a $30 million one.