CalcStack — free, instant, no signup. The interactive calculator loads automatically.

Step-Up Basis Calculator

Sell it and pay 23.8%. Hold it and pay 0%. The step-up is the biggest tax break nobody plans around.

Internal Revenue Code §1014 is the quiet giant of family tax planning: when an asset passes at death, its basis resets to fair market value, and every dollar of unrealized capital gain — plus every dollar of depreciation recapture on rental property — is simply erased. A $100,000 rental now worth $600,000 generates $119,000 of tax if sold during life and $0 if held to death. In the nine community-property states, BOTH halves of a married couple's community property step up at the first death; in common-law states only the decedent's half does. The one asset class left out: traditional IRAs and 401(k)s get no step-up — heirs pay ordinary rates on the 10-year clock. With the 2026 estate exemption at $15 million per person, the basis step-up — not the estate tax — is the break that matters for almost everyone. This calculator prices it for your exact numbers.

Why people use this

Families holding appreciated stock or rentals use it before selling in retirement: §1014 erases decades of gain AND recapture at death, community-property states double it at first death, and the gifting-carryover trap runs the wrong way.

How it works

  1. Enter the asset's original cost basis and its value today.
  2. Enter your combined capital-gains rate — 15% or 20% federal, plus 3.8% NIIT and state if applicable.
  3. Pick the ownership form: sole owner, joint in a common-law state, or community property.
  4. Read the tax if sold today versus the tax erased at death — and what survivors still owe.

Common questions

Why is gifting appreciated stock to my kids a mistake?

Because §1015 gives gifts a carryover basis — your kids inherit your $20 basis along with the stock, and owe capital-gains tax on decades of appreciation when they sell. The same stock passed at death gets a stepped-up basis: they could sell the next day and owe nothing. If you want to help kids now, gift cash or high-basis assets, and let the low-basis ones pass through the estate. The reverse move — gifting appreciated assets UP to an elderly parent and inheriting them back — is the legal maneuver planners call upstream gifting, and it works precisely because of the step-up.

We live in a community-property state — is it really double?

Yes, and it's routinely missed. In Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin, community property receives a full step-up on BOTH halves when the first spouse dies — the surviving spouse can sell immediately with zero gain. In a common-law state, jointly-held property gets only the decedent's half stepped up; the survivor's half keeps its old basis. On $500,000 of joint gain at 23.8%, that difference is $59,500. Some couples in common-law states use community-property trusts or agreements to capture it — worth asking an estate attorney.

Does the step-up erase depreciation recapture on my rental?

Yes — this is the real estate sleeper. All that §1250 depreciation you deducted at 25% recapture exposure, plus the appreciation, disappears into the stepped-up basis. The heirs inherit at market value, start depreciating fresh from the new basis, and the recapture bill never arrives. Combined with the 1031 exchange (defer during life) and the step-up (erase at death), the "swap 'til you drop" strategy is why rental empires pass largely income-tax-free. What does NOT get erased: traditional IRA and 401(k) balances — income in respect of a decedent — which is why Roth conversions late in life are partly a basis play.

Browse all 500+ free calculators →