Someone buys shares for a small amount decades ago and they are now worth a great deal. Selling realizes an enormous gain. Dying does not — the heirs generally receive the shares with a cost basis reset to the value at the date of death, and the entire lifetime of appreciation vanishes for capital gains purposes.
This single rule shapes a large amount of estate planning, and it points in the opposite direction from many people's instincts about giving things away early.
This is general information, not tax or legal advice. Rules vary by jurisdiction and change; consult a qualified professional.
What changed in 2026
- The exemption question settled for now. With the federal estate exemption set at a high permanent level, as covered in estate tax exemption, fewer estates face estate tax and basis planning became relatively more important.
- Proposals to limit step-up persisted. Measures to tax unrealized gains at death continued to appear in policy discussions without being enacted, keeping the rule subject to change.
- State-level divergence continued. State treatment of both estate tax and basis varied, making location a planning factor.
- Basis documentation requirements tightened. Establishing date-of-death value became more consistently required rather than assumed.
Gift versus inherit
|
Gift during life |
Inherit at death |
| Recipient's basis |
Your original basis, generally |
Value at date of death |
| Unrealized gain |
Transfers to the recipient |
Generally eliminated |
| Gift tax reporting |
May be required above annual limits |
Not applicable |
| Recipient sells immediately |
Pays tax on your full gain |
Little or no gain |
| Loss position asset |
Special rules limit the loss |
No step-up benefit; consider selling first |
| Control |
You give it up now |
You retain it until death |
The pattern is clear for appreciated assets. Giving shares worth a substantial amount with a small basis hands the recipient an embedded tax liability. Holding them and letting the same person inherit gives them the same asset with the gain erased.
The corollary is worth stating: if you want to give during life, give cash or assets with little embedded gain, and hold the highly appreciated ones. That inverts the common instinct to give away the thing that has done well.
For assets that have lost value, the logic reverses. There is no step-up benefit to preserve, and dying with a loss position wastes it entirely — selling to realize the loss while alive may be better.
The spousal case
Where community property rules apply, the surviving spouse may receive a step-up on the entire asset rather than only the deceased's share. In jurisdictions without those rules, typically only the deceased spouse's portion steps up.
That difference is substantial for a couple holding highly appreciated assets, and it is one of the ways where you live affects the outcome more than most people expect.
Documentation matters at death. Establishing the value on the relevant date is what supports the new basis, and reconstructing it years later for an illiquid asset is difficult. This belongs with the estate records discussed in digital estate planning.
Common mistakes
- Gifting appreciated assets to heirs during life. Transfers the gain along with the asset.
- Holding loss positions until death. Wastes the loss entirely.
- Assuming a full step-up for a surviving spouse. Depends on the property regime.
- No date-of-death valuation records. Makes the new basis hard to support later.
- Ignoring state differences. Both estate tax and basis treatment vary.
- Planning around a rule that could change. Proposals to limit it recur.
FAQ
Does step-up apply to retirement accounts?
Generally not in the same way. Tax-deferred accounts have their own inheritance rules and distribution requirements — see RMD rules explained.
What about jointly held property?
Treatment depends on the form of ownership and the jurisdiction. Joint tenancy and community property produce different outcomes.
Is a step-down possible?
Yes. If an asset has declined, the basis resets downward, which is why realizing losses during life can be better.
Could this rule be repealed?
Proposals recur. Planning that depends entirely on it carries some policy risk, which argues for flexibility.
Where to go next
For the estate tax context, read estate tax exemption. For gifting limits, gift tax annual exclusion, and for the practical documentation, digital estate planning.