Step-up in basis is one of the most valuable — and least understood — tax concepts for families inheriting property. It can dramatically reduce capital gains if heirs sell. Here is how it works for a California home, and how it interacts with Prop 19.
What step-up in basis does
When someone passes away, the cost basis of their property generally 'steps up' to its fair market value at the date of death. So if heirs sell soon after, their taxable gain is measured from that current value — often eliminating most or all of the built-up appreciation for capital gains purposes.
A simple illustration
Suppose a parent bought a home decades ago for $150,000 and it is worth $850,000 at their death. With step-up, the heir's basis becomes roughly $850,000. If the heir sells for about $850,000, the taxable gain may be minimal — even though the home appreciated enormously over the parent's lifetime.
Step-up vs Prop 19 — two different things
- Step-up in basis: a federal income-tax concept affecting capital gains when you sell.
- Prop 19 reassessment: a California property-tax concept affecting your annual tax bill.
- An inherited home can get a step-up for capital gains and still be reassessed for property tax.
- They are independent — confirm both with a CPA.
Why this matters for heirs deciding to sell
Because of step-up, selling an inherited home shortly after inheriting it often triggers little capital gains tax. Combined with Prop 19's property-tax consequences for keeping a home as a rental, the math frequently points toward selling for many heirs. This is exactly where I help families evaluate their options.
Records and timing
An accurate date-of-death valuation (often an appraisal) supports the stepped-up basis. If heirs hold the home and it appreciates further, gain from that point forward can be taxable. Timing and documentation matter, so involve a CPA early.
Steps for heirs
- Get a date-of-death valuation of the home.
- Understand your stepped-up basis.
- Weigh selling soon vs holding (and Prop 19 effects).
- Consult a CPA and estate attorney.
Frequently Asked Questions
What is step-up in basis?
Step-up in basis generally resets the cost basis of an inherited home to its fair market value as of the date of death. This can sharply reduce capital gains tax if heirs sell, because the gain is measured from the stepped-up value rather than the original purchase price. Confirm how it applies with a CPA.
How does step-up in basis reduce taxes?
It resets the basis to the home's value at the date of death, so most or all of the appreciation during the deceased owner's life is not taxed as capital gain if heirs sell soon after. The taxable gain is measured from the stepped-up value. A CPA can quantify the benefit for your situation.
Is step-up in basis the same as Prop 19?
No. Step-up in basis is a federal income-tax concept affecting capital gains when you sell, while Prop 19 reassessment is a California property-tax concept affecting your annual tax bill. An inherited home can receive a step-up for capital gains and still be reassessed for property tax. They are independent; confirm both with a CPA.
Should heirs sell an inherited home soon after inheriting?
Often the tax math favors it. Step-up in basis means selling shortly after inheriting can trigger little capital gains tax, and Prop 19 may raise property taxes if the home is kept as a rental. But the right choice depends on the family's goals. I can help evaluate the real estate side; consult a CPA on taxes.
Do I need an appraisal for step-up in basis?
Generally yes, or another supportable valuation. An accurate date-of-death value supports the stepped-up basis and helps establish the gain if heirs later sell. Without good documentation, the basis can be harder to prove. A CPA or appraiser can advise on the right valuation approach for an inherited home.
What if heirs hold the home and it appreciates more?
If heirs keep the inherited home and it appreciates beyond the stepped-up value, the additional gain from that point forward can be taxable when they eventually sell. Step-up captures appreciation only up to the date of death. Timing and records matter, so consult a CPA about holding versus selling.
