One of the most powerful, and most underappreciated, tax benefits in estate planning sits quietly inside a concept called the step-up in basis. Most people focus estate planning conversations on the estate tax: whether their estate is large enough to owe it, and how to reduce exposure. But for the majority of Americans whose estates fall below the federal estate tax threshold, the step-up in basis has a far more immediate impact on what their heirs actually pay in taxes. Understanding this rule changes how to think about which assets to hold, which to gift during life, and which to pass through the estate.
What Basis Means and Why It Matters
In tax law, basis is generally the original cost of an asset. When you sell an asset, you pay capital gains tax on the appreciation, meaning the difference between what you received and your basis. If you bought stock for $10,000 and sold it for $50,000, your basis is $10,000 and your taxable gain is $40,000.
Long-term capital gains rates under the current federal tax code top out at 20% for high-income taxpayers, with most middle-income filers paying 15%. On a significant appreciated asset, the capital gains tax bill can be substantial.
What the Step-Up Does
When a person inherits an asset, the Internal Revenue Code ยง 1014 generally resets the basis of that asset to its fair market value at the date of the decedent’s death. This is the step-up. If a parent bought stock for $10,000 and it was worth $100,000 when they died, the heir’s basis in that stock is $100,000, not $10,000.
If the heir then sells the stock immediately after inheriting it, they owe zero capital gains tax on the $90,000 of appreciation that occurred during the parent’s lifetime. That appreciation is permanently sheltered from income tax. It doesn’t simply defer the tax. It eliminates it entirely.
The Planning Implication: What to Hold and What to Gift
The step-up in basis creates a clear planning principle. Highly appreciated assets, meaning those that have grown significantly in value since purchase, are generally better candidates to pass through the estate at death than to give away during life. A lifetime gift carries over the donor’s original basis. The recipient takes the gifted asset with the same low basis and eventually owes capital gains tax on all the appreciation that occurred before the gift.
This means that gifting a highly appreciated asset during life to reduce estate taxes may cost more in capital gains taxes than the estate tax saving is worth, depending on the numbers. Estate planning involves balancing these considerations deliberately.
Conversely, assets that have depreciated or have minimal appreciation may be better candidates for gifting during life, where the basis question matters less.
Retirement Accounts Are Different
The step-up in basis does not apply to traditional IRAs, 401(k) plans, and other pre-tax retirement accounts. Withdrawals from these accounts are taxed as ordinary income regardless of when the account owner dies. The basis rules that govern capital assets don’t apply to income that was never previously taxed. This makes the planning strategy around inherited retirement accounts fundamentally different from the strategy around inherited investment portfolios.
An estate tax planning lawyer at Estate Planning Pros can evaluate the specific assets in your estate and help you understand whether the step-up in basis rule supports holding or gifting each one. Connect with an estate tax planning lawyer to discuss how these rules apply to your situation and what planning decisions they support.