Inherited Stock Taxes: How Step-Up in Basis Reduces Capital Gains

Inheriting stock after a loved one’s death can feel overwhelming. There is grief, paperwork, and then the inevitable question: What taxes do you owe?

Here is the good news. For tax purposes, inherited stock often comes with a powerful benefit called the step-up in basis. This rule can significantly reduce or even eliminate capital gains tax when you sell.

In this guide, we break down how inherited stock taxes work, how cost basis is determined, and what happens when you sell inherited shares. No jargon. No scare tactics. Just clear answers so you can make confident decisions during a stressful time.

Early on, it also helps to understand how this fits into the broader picture of stock taxation. We recommend reviewing our Stock Taxes Guide for foundational context.

What Happens for Tax Purposes When You Inherit Stock

Inherited stock refers to shares of stock transferred to you after the original owner’s death. These assets may come through a brokerage account, an irrevocable trust, or directly from the estate.

From a tax standpoint, inherited assets follow different tax rules than assets you purchase or receive as gifts. If you received stock as a gift instead, the tax rules are very different. See our Gifted Stock Taxes guide to understand how carryover basis works.

Simply inheriting stock is not a taxable event. You do not owe income taxes just because shares were transferred to you. Taxes generally come into play only when you sell the stock.

What Is Step-Up in Basis and Why Does It Matter

How Step-Up in Basis Works

Cost basis is the value used to calculate capital gains when an asset is sold. For inherited stock, the cost basis is generally stepped up (or down) to the fair market value on the date of the decedent’s death, as provided under IRC §1014.

This means the original purchase price no longer matters. Whether the original owner bought the stock for $5 or $50 per share decades ago, your new basis is tied to its market value at death.

This adjustment is commonly called a step-up in basis, though in rare cases it can be a step-down if the stock declined in value.

Source: IRS Pub. 551

Why It Can Dramatically Reduce Capital Gains

Capital gains tax is calculated based on the difference between your selling price and your cost basis. Because inherited stock typically receives a stepped-up basis, years of unrealized gains often disappear.

Example:

• The original owner bought stock for $10,000
• Stock value at date of death is $60,000
• You sell the stock for $62,000

Your capital gains are calculated on the $2,000 increase, not the $52,000 gain that occurred during the original owner’s lifetime. That can significantly reduce your tax liability.

How the Cost Basis of Inherited Stock Is Determined

Date of Death Value vs Fair Market Value

For tax purposes, the cost basis of inherited stock is usually reset to the fair market value on the date of death, which is very different from how cost basis works for stocks you purchase yourself.

Brokerage firms often update the cost basis automatically, but it is still your responsibility to confirm accuracy for tax purposes.

Alternate Valuation Date Explained at a High Level

In limited situations, the estate may elect an alternate valuation date six months after death, but only if it reduces both the value of the gross estate and the estate tax owed. This election is made at the estate level, not by the heir. This option is generally used only if it lowers the taxable estate and overall tax burden.

As an heir, you typically receive the basis reported by the estate. You do not choose this valuation yourself. If you are unsure which value applies, a tax professional can help clarify.

Source: IRS Form 706 Instructions

Selling Inherited Stock and Capital Gains Taxes

How Capital Gains Are Calculated on Inherited Stock

When selling inherited stock, capital gains taxes are calculated using the stepped-up basis, meaning most of the appreciation that occurred during the original owner’s lifetime is not taxed. The formula is:

Selling price - stepped-up cost basis = taxable gain

If you sell immediately after inheriting, the sale price and market value are often very close. That can result in little to no capital gains tax owed.

If you hold the stock and it appreciates further, you will pay capital gains taxes on the increase after inheritance. Keep in mind that state taxes may also apply. See our State Capital Gains Tax guide to understand how your location affects what you owe.

For deeper mechanics, readers can explore our Cost Basis Guide and Capital Gains Overview.

Long-Term vs Short-Term Capital Gains Rules

Inherited stock is generally treated as long-term property under IRC §1223, regardless of how long you hold it after inheritance.

This means you do not pay ordinary income taxes on the sale. Instead, long-term capital gains tax rates apply, which are typically lower than ordinary income tax rates.

This rule applies even if you sell the stock less than a year after inheriting it.

Worked Example: Inherited Stock With Step-Up

Scenario: Your grandmother bought 1,000 shares of XYZ Corp in 1985 for 10,000 (10/share). She held them until her death on April 1, 2025, when the stock traded at 120/share (total value: 120,000).

You inherit the shares. Your stepped-up basis is $120,000 (the fair market value on the date of death) — NOT the original $10,000.

Scenario A: You sell immediately at 122/share (total: 122,000).

• Proceeds: $122,000
• Basis: $120,000
• Long-term capital gain: $2,000
• Federal tax at 15%: $300

Scenario B: You hold for three years and sell at 180/share (total: 180,000).

• Proceeds: $180,000
• Basis: $120,000
• Long-term capital gain: $60,000 (only the appreciation after inheritance)
• Federal tax at 15%: $9,000

What you avoided: Without step-up, Scenario A would have generated a 112,000 gain taxed at 16,800 (15%). Step-up saved you $16,500 in tax.

Situations Where Step-Up in Basis Works Differently

Community Property States

In community property states, jointly owned community property may receive a full step-up in basis when one spouse dies, but this depends on state law and how the asset is titled. This means both halves of the stock receive a basis adjustment, not just the deceased spouse’s portion.

These rules are complex and vary by state, so professional tax advice is strongly recommended.

Community Property State List

• Arizona
• California
• Idaho
• Lousiana
• Nevada
• New Mexico
• Texas
• Washington
• Wisconsin

Source: IRS Pub. 551

When Step-Up in Basis Does Not Apply

Step-up in basis does not apply in every situation. Common exceptions include:

• Assets held in certain retirement accounts, like an inherited IRA
• Income in respect of a decedent, such as unpaid dividends
• Some trust structures that restrict ownership

If step-up does not apply, certain inherited items such as income in respect of a decedent (IRD) are taxed as ordinary income when received or sold, rather than capital gains.

Inherited Retirement Accounts and the SECURE Act

Inherited retirement accounts — traditional IRAs, 401(k)s, and similar — do not receive a step-up in basis. Distributions from these accounts are taxed as ordinary income to the beneficiary, just as they would have been to the original owner.

SECURE Act 10-year rule (for deaths after 12/31/2019):

Most non-spouse beneficiaries must empty the inherited account within 10 years of the original owner's death. Exceptions apply for:

• Surviving spouses (can roll into own IRA)
• Minor children of the decedent (until majority, then 10-year clock)
• Disabled or chronically ill beneficiaries
• Beneficiaries less than 10 years younger than the decedent

Roth IRAs: Inherited Roth IRA distributions are typically tax-free (if the account was open 5+ years), but the 10-year rule still applies for account closure.

Planning implication: Large inherited IRAs can create significant income tax burdens if the 10-year rule forces rapid distributions. Spreading distributions over 10 years in lower-income years can help — a tax professional can model your situation.

Source: IRS Pub. 559

Common Tax Mistakes to Avoid When Selling Inherited Stock

Inherited stock often comes with favorable tax treatment, but simple mistakes can still create unnecessary headaches or a higher-than-expected tax bill.

One common error is using the original purchase price instead of the stepped-up basis. For inherited stock, the cost basis is usually the fair market value on the date of death, not what the original owner paid. Using the wrong number can dramatically overstate capital gains.

Another frequent issue is assuming no paperwork is required if little or no tax is owed. Even when the step-up in basis eliminates most gains, reporting the sale of inherited stock is still required to properly document the transaction with the IRS. Skipping this step can trigger notices or delays.

Heirs also sometimes overlook how selling inherited stock affects their overall taxable income. While gains are typically taxed at long-term capital gains rates, they can still influence your tax bracket, credits, or other income-based calculations.

Finally, relying solely on brokerage account defaults can be risky. While many brokers automatically update inherited stock basis, errors can occur. Verifying the numbers before you file can help you avoid paying more taxes than necessary.

Do You Owe Estate or Inheritance Taxes on Inherited Stock

This is where confusion runs rampant.

At the federal level, heirs do not pay inheritance tax, and estate tax applies only if the estate exceeds the federal exemption amount for the year of death. Estate tax applies to the estate itself if the taxable estate exceeds federal thresholds.

Some states impose inheritance or estate taxes, but the rules vary widely. This article does not cover estate tax obligations in detail. If this is a concern, consult an estate-planning attorney or a tax professional.

The key takeaway is that selling inherited stock typically triggers capital gains taxes, not estate or inheritance taxes.

Federal Estate Tax Exemption

The federal estate tax exemption is $13.99 million per individual for 2025 decedents (27.98M for married couples with portability). The exemption is indexed annually. For 2026, it's estimated at approximately 15 million.

Practical implication: Only about 0.07% of estates owe federal estate tax. Most heirs never face this tax, regardless of how much stock they inherit.

Portability: A surviving spouse can "inherit" the unused portion of their deceased spouse's exemption by filing Form 706 within 9 months of death (or 15 months with extension). This effectively doubles the exemption for married couples.

Important caveat: The 2017 Tax Cuts and Jobs Act doubled the exemption through 2025. Starting in 2026, the exemption was scheduled to revert to approximately half — but the 2024 election results and subsequent legislation may extend or modify this. Verify the current law before doing estate planning.

State-Level Estate and Inheritance Taxes

Some states impose estate or inheritance taxes with significantly lower thresholds than the federal level.

States with an estate tax (tax paid by the estate): Connecticut, Hawaii, Illinois, Maine, Maryland, Massachusetts, Minnesota, New York, Oregon, Rhode Island, Vermont, Washington, and the District of Columbia.

States with an inheritance tax (tax paid by the heir based on relationship to decedent): Iowa, Kentucky, Maryland, Nebraska, New Jersey, Pennsylvania.

Maryland is the only state with both.

Thresholds and rates vary significantly by state. Some states exempt spouses and children entirely, while others tax them at reduced rates. If the decedent lived in or owned property in one of these states, consult a tax professional or estate-planning attorney.

Note: State laws change. Iowa's inheritance tax is scheduled to phase out completely by 2025, and other states periodically update their rules. Verify current state law.

Source: IRS Pub. 559, Estate Tax

When to Talk to a Tax Professional

If your inheritance includes significant assets, multiple brokerage accounts, or trusts, getting tax advice is wise.

A tax professional or financial advisor can help:

• Confirm the correct cost basis
• Understand your tax liability before selling
• Coordinate stock sales with other income to manage tax rates
• Ensure compliance with current tax laws

Think of it as protecting yourself from expensive surprises.

Final Thought

Inherited stock taxes do not have to be intimidating. Thanks to the step-up in basis, many heirs pay far less in capital gains taxes than they expect. With the right information and a little guidance, you can make smart decisions that honor your loved one and protect your financial future.

If you want help understanding your stock tax situation or selling inherited shares with confidence, FileTax.com is here to make taxes simpler and less stressful.