Understanding Tax Basis and Step-Up in Basis

April 5, 2026
Paramus Estate Planning

When it comes to estate planning, few concepts are as important—and as misunderstood—as tax basis. Whether you’re gifting property during your lifetime or passing it on at death, understanding how basis works can significantly impact the taxes your heirs may owe.

In this article, we’ll break down the basics of tax basis, how it applies to lifetime gifts versus inheritances, and why the “step-up in basis” can be a powerful estate planning tool.

What Is Tax Basis?

Your tax basis is generally what you paid for an asset. For example:

  • If you purchase real estate for $100,000, your tax basis is $100,000.
  • If you subsequently update the kitchen for $10,000, your tax basis becomes $110,000
  • If it’s commercial property and you reduce your taxes due to depreciation, your tax basis will slowly decrease, but those details are best discussed with a qualified tax professional.

How Capital Gains Tax Works

When you sell a property, you are taxed on the difference between:

  • The sale price, and
  • Your tax basis

Example:

  • Purchase price (basis): $100,000
  • Sale price: $150,000
  • Taxable gain: $50,000

This $50,000 is generally subject to capital gains tax.

What Happens When You Gift Property?

If you give property to someone during your lifetime, the recipient receives a carryover basis.

Example:

  • You bought a property for $100,000
  • You gift it to your child
  • Your child’s basis: $100,000

If your child later sells the property for $150,000, they will owe tax on the $50,000 gain.

Key takeaway: Gifting property does not reset the tax basis.

What Happens When Property Is Inherited?

When property is inherited, the rules are very different—and often more favorable.

Heirs receive a step-up in basis, meaning the new basis becomes the property’s fair market value at the date of death

Example:

  • Original purchase price: $100,000
  • Value at date of death: $150,000
  • New basis for heir: $150,000

If the heir sells the property immediately for $150,000, there is no taxable gain.

Holding the Property After Inheritance

If the heir keeps the property and it appreciates further:

Example:

  • Inherited basis: $150,000
  • Later sale price: $175,000
  • Taxable gain: $25,000

Importantly, the taxable gain is calculated from the stepped-up basis, not the original purchase price.

Gifting vs. Inheriting: A Critical Tax Difference

Let’s compare two scenarios:

Scenario 1: Property Is Gifted Before Death

  • Original basis: $100,000
  • Sale price: $175,000
  • Taxable gain: $75,000

Scenario 2: Property Is Inherited

  • Original basis: $100,000
  • Stepped-up basis: $150,000
  • Sale price: $175,000
  • Taxable gain: $25,000

Result: Inheriting the property results in significantly less taxable gain due to the step-up in basis.

Co-Owned Property and Partial Step-Up

For jointly owned property, basis is divided proportionally.

Example (50/50 ownership):

  • Total original basis: $100,000
  • Each owner’s basis: $50,000

When one owner passes away:

  • Their half receives a step-up to market value
  • Assume half the property is now worth $75,000

New total basis:

  • Your half: $50,000
  • Inherited half: $75,000
  • Total: $125,000

This is often referred to as a partial step-up in basis.

Why This Matters for Estate Planning

Understanding basis is critical when deciding whether to:

  • Gift property during your lifetime
  • Hold property until death
  • Structure ownership between family members

In many cases, holding appreciated assets until death can reduce the overall tax burden on your heirs due to the step-up in basis. However, every situation is unique and should be evaluated in the context of your broader estate plan.

Final Thoughts

Tax basis and step-up rules can have a profound impact on your family’s financial future. A well-structured estate plan doesn’t just transfer assets—it minimizes unnecessary tax consequences.

If you own appreciated property or are considering gifting assets, consult with an experienced estate planning attorney and tax advisor to determine the best strategy for your specific situation.

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