Step-Up Basis Calculator

How to Use This Tool

Follow these steps to calculate the stepped-up basis for an inherited asset:

1. Select the currency of the asset from the dropdown menu.
2. Enter the original cost basis (the price the decedent paid when purchasing the asset).
3. Enter the fair market value (FMV) of the asset on the decedent's date of death.
4. Input the valid date of death for the original asset owner.
5. Choose the valuation method: default FMV at death, or alternate valuation (6 months after death, requires estate election).
6. If using the alternate valuation method, enter the FMV on the alternate date.
7. Optionally enter the sale price if you sold the asset to calculate capital gains/losses.
8. Click Calculate Basis to view results, or Reset to clear all inputs.

Formula and Logic

The step-up basis calculation adjusts the cost basis of an inherited asset to its fair market value on the date of the decedent's death. The core logic follows IRS rules for inherited property:

• Default Basis: Fair Market Value (FMV) of the asset on the decedent's date of death.
• Alternate Valuation Basis: If the estate elects the alternate valuation date (6 months after death, or the date the asset is sold if sooner), the basis is the FMV on that alternate date.
• Capital Gains Calculation: If the heir sells the asset, Capital Gain/Loss = Sale Price - Adjusted Stepped-Up Basis.

Note: The step-up basis applies to most inherited assets, including stocks, real estate, and personal property. It replaces the original cost basis for tax purposes when the heir sells the asset.

Practical Notes

• Step-up basis only applies to assets held in the decedent's estate. Assets held in trusts or with designated beneficiaries (like 401(k)s) may not qualify.
• Capital gains tax rates for long-term holdings are lower than short-term rates. Since inherited assets are automatically long-term, heirs benefit from lower tax rates.
• State-level estate and inheritance taxes may apply in addition to federal taxes. Check your state's rules for specific thresholds.
• If the FMV at death is lower than the original cost basis, this is called a step-down basis, which can reduce capital gains tax if the asset is sold for a profit later.
• Always retain documentation of the decedent's date of death, FMV appraisals, and original purchase records for tax reporting.

Why This Tool Is Useful

This calculator simplifies complex estate tax rules for everyday users:

• Heirs can quickly estimate their adjusted cost basis without manual calculations.
• Financial planners can use it to model tax liabilities for clients inheriting assets.
• It helps users understand potential capital gains tax obligations before selling inherited property.
• The optional sale price input lets you test different sale scenarios to minimize tax impact.

Frequently Asked Questions

What assets qualify for step-up basis?

Most inherited assets held in the decedent's estate qualify, including real estate, stocks, bonds, and personal property. Assets with designated beneficiaries (like life insurance proceeds, retirement accounts) and assets held in irrevocable trusts typically do not qualify for step-up basis.

Does step-up basis apply to assets inherited from a spouse?

Yes, but with a modification: surviving spouses in community property states get a full step-up to FMV at the date of death. In non-community property states, the surviving spouse gets a step-up on the decedent's half of the asset, while their own half retains the original basis.

How does step-up basis affect my tax bill when I sell the inherited asset?

Your capital gain is calculated as the difference between your sale price and the stepped-up basis, not the original price the decedent paid. This often reduces your taxable gain significantly, especially if the asset appreciated in value over time. You will pay long-term capital gains tax on the gain, which has lower rates than ordinary income.

Additional Guidance

• For real estate, use a qualified appraisal to determine FMV at the date of death, as this is required for IRS reporting.
• If the estate elects the alternate valuation date, all assets in the estate must use the same alternate date, not just a single asset.
• Keep records of all calculations and supporting documents for at least 3 years after filing the tax return that reports the sale of the inherited asset.
• This tool provides estimates only and does not constitute tax advice. Consult a certified public accountant (CPA) or tax attorney for personalized guidance.