A step-up in basis is a tax rule that adjusts the cost basis of inherited assets to their fair market value on the date of the original owner's death. Instead of inheriting an asset with the deceased's original purchase price as the basis, heirs receive a "stepped-up" basis equal to what the asset was worth when they inherited it. This is one of the most significant tax benefits in the U.S. tax code, potentially eliminating capital gains taxes on decades of appreciation.
How It Works
When you inherit an asset, the IRS allows your cost basis to be adjusted to the asset's fair market value on the date of death (or six months later, if the estate executor chooses). This new basis becomes your starting point for calculating future capital gains or losses. If you immediately sell the inherited asset at the same price, you owe no capital gains tax. Only gains occurring after you inherit the asset are taxable.
Example timeline: An investor purchases stock for $50,000 in 1995. By 2024, it's worth $500,000. When they pass away, their heir's basis automatically becomes $500,000, not $50,000. The $450,000 gain vanishes from a tax perspective.
Why It Matters for Investors
For high-net-worth investors and entrepreneurs, the step-up in basis is a powerful estate planning tool. It allows substantial wealth to transfer to the next generation without triggering capital gains taxes on appreciated assets. This is particularly valuable for concentrated positions in company stock, real estate, or investment portfolios that have grown significantly over time.
Understanding this benefit shapes investment strategies and estate planning decisions. Some investors hold appreciated assets longer specifically to maximize this tax benefit. However, it's important to note that this provision has been subject to political discussion and potential future changes.
Example
Sarah invested $100,000 in a startup 20 years ago through her angel investing activities. The company succeeded, and her stake is now worth $5 million. When Sarah passes away, her son inherits the shares. His cost basis is $5 million, not Sarah's original $100,000. If he sells immediately for $5 million, he owes zero capital gains tax on the $4.9 million appreciation that occurred during Sarah's lifetime.
Key Takeaways
- The step-up in basis resets inherited asset values to fair market value at death, eliminating tax on prior appreciation
- This benefit applies to most inherited assets, including stocks, real estate, and business interests
- It's particularly valuable for concentrated positions and long-held investments with substantial gains
- Work with a tax advisor and estate planner, as rules may change and special situations (like IRLTs) have different treatment