One of the most powerful tax benefits available to investors is the step-up in cost basis at death. If stocks, real estate, or other investments have appreciated significantly, selling them during life can trigger substantial capital gains tax. Assets transferred at death may instead receive a new basis equal to their fair market value.
Understanding these rules can influence when to sell investments, whether to gift assets to children, and how to coordinate investment and estate plans.
Key Takeaways
Step-up in cost basis is an important tax benefit that can influence both investment management and estate planning.
For investors with significant unrealized capital gains, preserving appreciated assets for heirs can potentially eliminate substantial future capital gains taxes.
Five considerations are worth remembering:
- Inherited assets generally receive a new cost basis based on their fair market value at death.
- Not every asset qualifies, particularly traditional retirement accounts and certain irrevocable trusts.
- Gifting appreciated assets during your lifetime can transfer the original low cost basis to your heirs.
- Married couples may benefit from a full basis adjustment on qualifying community property when the first spouse dies and another adjustment on eligible assets when the surviving spouse dies.
- Long-term tax deferral strategies can be especially valuable when combined with an eventual step-up in basis.
1. What Is Step-Up in Cost Basis?
When you purchase an investment, its original purchase price generally becomes its cost basis. Your adjusted basis determines the capital gain or loss recognized when you sell.
Imagine stock purchased for $100,000 that grows to $500,000. A sale during life generally produces a $400,000 capital gain, potentially subject to federal capital gains tax, the Net Investment Income Tax, and state income tax.
If the owner instead holds the stock until death and leaves it to children, the children's basis generally becomes the fair market value on the date of death:
- Original purchase price: $100,000
- Market value at death: $500,000
- New cost basis for children: $500,000
- Capital gain if they immediately sell for $500,000: $0
The $400,000 of appreciation during the original owner's lifetime is generally eliminated for capital gains tax purposes. The children can sell at the date-of-death value without tax on appreciation during the original owner's lifetime. Appreciation after death can still be taxable when the heirs sell. The rule is technically a basis adjustment: an asset that has declined in value may receive a step-down instead.
2. Which Assets Qualify for a Basis Adjustment?
The rules apply to many appreciated assets transferred at death, but not every asset receives this treatment.
Assets that generally qualify
- Stocks and ETFs: Individual stocks, index funds, exchange-traded funds, and mutual funds in taxable brokerage accounts.
- Real estate: Primary residences, vacation homes, rental properties, and investment real estate.
- Business interests: Certain interests in privately held businesses, partnerships, and LLCs, subject to more-complex rules for underlying assets.
- Other investments: Bonds, cryptocurrency, precious metals, and certain collectibles, subject to special rules.
- Revocable living trust assets: Assets held in a typical revocable living trust generally remain eligible because they are included in the owner's estate.
Assets that generally do not qualify
- Retirement accounts: Traditional IRAs, Roth IRAs, 401(k)s, 403(b)s, and pensions generally do not receive a basis adjustment. Traditional-account distributions are generally ordinary income; qualified Roth distributions are generally tax-free.
- Annuities: Tax-deferred annuities generally do not receive a basis adjustment for accumulated untaxed earnings.
- Lifetime gifts: Appreciated assets gifted during life generally retain the donor's original basis.
- Certain irrevocable trusts: Assets excluded from the deceased owner's estate generally may not receive a basis adjustment. Results depend on the trust structure and estate inclusion.
The distinction between a revocable and irrevocable trust is particularly important. A revocable living trust can help with estate administration while generally preserving the basis adjustment. Some irrevocable trust structures remove assets from the taxable estate and can also eliminate eligibility for a basis adjustment. Estate planning and income-tax planning should be considered together.
3. Why Gifting Appreciated Assets During Life Can Be a Tax Mistake
Gifting can be valuable for many personal and planning reasons, but it can create a future capital-gains burden when the asset has appreciated. Gifts generally have carryover basis, while inherited assets generally receive a new basis.
Option A: Gift the stock while alive
For stock bought for $100,000 and worth $500,000, the recipient generally receives the $100,000 basis. A later $500,000 sale would generally recognize a $400,000 capital gain.
Option B: Leave the stock as an inheritance
If the owner holds the same stock until death, the heir's basis is generally adjusted to the $500,000 date-of-death value. An immediate sale for that amount would generally produce no capital gain.
How does the estate-tax exemption affect this decision?
In 2026, the federal estate and gift tax basic exclusion amount is $15 million per individual. For a married couple, the combined exclusion can potentially reach $30 million, assuming both exclusions are fully available and applicable requirements are satisfied.
If an estate is comfortably below the applicable federal estate-tax exemption, it may not be necessary to gift appreciated investments during life to reduce federal estate tax. Retaining those assets until death can preserve the opportunity for heirs to receive a stepped-up basis.
This makes the distinction between estate taxes and capital gains taxes especially important. Estate taxes apply to certain transfers of wealth at death; capital gains taxes generally apply when investments are sold for a profit. An estate can owe no federal estate tax while still holding investments with millions of dollars in unrealized capital gains.
For families below the estate-tax threshold, preserving the step-up in basis may be more valuable than transferring appreciated investments early. Lifetime gifts can still make sense for families subject to state estate taxes, those expecting significant future appreciation or changes in tax circumstances, or those with important family and financial reasons to transfer wealth earlier. The tax consequences should be reviewed before transferring appreciated assets.
4. How Married Couples Can Benefit from Two Basis Adjustments
For married couples, particularly those living in community-property states, the basis rules can create an additional tax-planning opportunity. Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin generally follow community-property laws.
When the first spouse dies, qualifying community property generally receives a basis adjustment on both spouses' ownership interests, provided applicable estate-inclusion requirements are met. This is often called a double step-up in basis because both halves of the community property receive the adjustment.
If the surviving spouse continues to own an appreciated asset until their death, eligible assets may receive another adjustment when passed to the next generation. The same investment can therefore receive basis adjustments at two different points in time: when the first spouse dies and again when the surviving spouse dies.
Example: Two adjustments across generations
Imagine a California couple buys a community-property stock portfolio for $200,000. At the first spouse's death, it is worth $800,000. Because it qualifies as community property, the entire portfolio generally receives a new $800,000 basis, including the surviving spouse's half. The $600,000 of appreciation since purchase is effectively eliminated for capital gains purposes.
The surviving spouse continues holding the portfolio. Fifteen years later, it is worth $1.5 million. When the survivor dies and leaves the portfolio to the children, it can receive another adjustment to its then-current value.
| Event | Portfolio value | Adjusted cost basis |
|---|---|---|
| Original purchase | $200,000 | $200,000 |
| First spouse dies | $800,000 | $800,000 |
| Second spouse dies | $1,500,000 | $1,500,000 |
| Children sell portfolio | $1,500,000 | $1,500,000 |
The potential result is $1.3 million of investment appreciation avoided for capital gains purposes over two generations. The children can generally sell at $1.5 million without recognizing capital gain, assuming no value change between inheritance and sale.
Why community-property status matters
If the same portfolio were instead held as a typical 50/50 joint tenancy outside community-property rules, only the deceased spouse's half would generally receive an adjustment at the first death. In this example, the new combined basis would generally be $500,000 rather than $800,000. The surviving spouse's later death may still create a further adjustment, but the community-property advantage is particularly valuable if the survivor sells between the two deaths.
Living in a community-property state does not automatically characterize every asset as community property. Property acquired before marriage, inherited assets, and property subject to certain agreements may be treated differently.
For couples with significant appreciated investments, coordinating community-property classification, trust structure, and investment strategy can make a substantial difference in the after-tax wealth transferred to children.
Final Thoughts
Step-up in cost basis is an important tax benefit that can influence both investment management and estate planning. For investors with significant unrealized gains, holding appreciated assets until death rather than selling during life can be a valuable tax strategy. It may let investments compound without realizing gains and potentially eliminate those gains when heirs inherit the assets.
This also makes tax-loss harvesting particularly attractive. Investors can realize losses to offset taxable gains from other investments while deferring gains on appreciated holdings. If those appreciated assets are eventually inherited with a stepped-up basis, the deferred gains may never be taxed.
Tax savings should still be balanced with diversification, liquidity needs, and estate-planning goals. The objective is not simply to minimize taxes today, but to maximize after-tax wealth over a lifetime and across generations.