How the Step-Up in Basis Works
Step-up in basis impact — inherited vs gifted assets
| Scenario | Original Owner’s Basis | FMV at Death | Heir’s Basis | Taxable Gain if Heir Sells Immediately |
|---|---|---|---|---|
| Stock bought for $10K, worth $80K at death | $10,000 | $80,000 | $80,000 (stepped up) | $0 |
| Real estate bought for $200K, worth $800K at death | $200,000 | $800,000 | $800,000 (stepped up) | $0 |
| Business interest: $50K basis, $1.2M at death | $50,000 | $1,200,000 | $1,200,000 (stepped up) | $0 |
| Without step-up (gift instead) | $10,000 (carryover) | — | $10,000 | $70,000 gain taxable on eventual sale |
What Receives the Step-Up (and What Does Not)
- Does receive step-up: Stocks, bonds, real estate, business interests, artwork, and other investment assets held outside retirement accounts
- Does receive step-up: Joint tenancy property — the decedent’s half gets stepped up
- Does NOT receive step-up: Traditional IRAs, 401(k)s, 403(b)s — distributions are still ordinary income regardless of basis
- Does NOT receive step-up: Roth IRAs — but they were already tax-free, so no step-up needed
- Does NOT receive step-up: Assets already transferred by gift during lifetime (gift basis carries over)
- Special case: Community property states — BOTH halves of community property receive a step-up, even the surviving spouse’s half
A family that inherited a $3 million stock portfolio with a $300,000 original cost basis in 2024 paid zero capital gains tax on the $2.7 million in appreciation — permanently forgiven. At a 15% federal capital gains rate plus 5% state, this represents $540,000 in tax that would have been owed without the step-up. The step-up is worth this amount to the heirs.
Estate Planning Implications of the Step-Up
The step-up incentivizes holding highly appreciated assets until death rather than selling them during life. For investors in the 15-20% capital gains bracket with large appreciated positions, the lifetime tax saving from never selling until death can be enormous — particularly for real estate investors using 1031 exchanges throughout their investing career, terminating in a final step-up at death.
Calculate the Capital Gains Impact of Inherited Assets
Enter the original basis and inherited fair market value to see the step-up and any capital gains if sold at different prices.