The Step-Up in Basis on Inherited Claremont Property

Two families inherit similar houses. One sells within the year and the tax conversation is short. The other holds the property for a decade, sells, and has a much more complicated year. The mechanism behind that difference is basis, and it is one of the few parts of inheriting property that is genuinely favorable.

This article explains the concept and the practical steps around it. It does not calculate anything, and it does not state rates, thresholds, or amounts. Those belong with a CPA who has the actual facts.

What basis is

Basis is, in ordinary language, the number a sale gets measured against. If someone buys a house and later sells it, the gain that may be taxable is measured against what they put into it, adjusted over time.

For a property bought decades ago and held through a long ownership, that original number can be very far below current value. If the owner had sold during their lifetime, that spread would have been in play. Long-tenure California homeowners often stayed put partly for this reason.

What happens at death

Federal tax law generally provides that property passing through an estate receives a basis adjusted to its value at the date of death. This is what people mean when they say the basis stepped up. Verify how it applies to your situation with a CPA or tax counsel.

The practical consequence is significant. The appreciation that accumulated over the deceased owner lifetime is generally not carried forward to the heirs as it would have been in a lifetime sale. An heir who sells shortly after the death is measuring the sale against a much more recent number.

How this works when property is held in a trust, held jointly, held as community property, or subject to other arrangements varies, and there are situations where the treatment is different from the general rule. This is exactly the kind of question that should not be answered from a general article.

Why the date-of-death valuation matters so much

Because basis is set by reference to value at the date of death, the documentation of that value becomes important, and it becomes important years before anyone needs it.

An estate that goes through probate will typically have an appraisal in the record already, since California probate uses an appointed referee to value estate assets. That is one reason the referee valuation is worth understanding rather than filing away. We cover it in the probate referee and your home value.

An estate that does not go through probate, because the property was held in a trust or passed another way, may have no such document unless someone obtains one. Families in that situation sometimes discover, years later, that they need to establish a value for a date that has long passed and nobody wrote anything down.

The practical advice is simple. Get a written valuation as of the date of death, keep it, and tell whoever is going to handle the taxes that it exists. It is inexpensive at the time and hard to reconstruct later.

How it changes the keep-or-sell decision

Basis is one of the reasons the timing of a sale after an inheritance is worth thinking about rather than defaulting.

An heir who sells relatively soon after a death is generally measuring the sale against a recent value. An heir who holds the property for many years is accumulating appreciation from that point forward, which is an ordinary consequence of owning real estate and not a problem, but it is a different position than the one they started in.

None of that says sell. Plenty of families keep an inherited house for excellent reasons, and the property tax side may push in a different direction than the income tax side. The point is that the two tax questions and the family question should be on the table together. The wider version of the decision is in whether to keep or sell an inherited house, and the California property tax half is in Proposition 19 and inherited homes.

Improvements, records, and the boring part

Whatever the starting basis is, what happens afterward matters. Capital improvements to a property generally affect basis, and the records that support them are the responsibility of whoever owns the property.

If an estate or an heir puts a new roof on the house, replaces systems, or does substantial work before a sale, keep the invoices. Keep them somewhere that will survive a move and a change of email address. Families who do renovation work on an inherited property and then cannot document it are in a worse position than families who did nothing.

The same applies to the costs of the sale itself. Your CPA will ask, and the answer is easier if somebody kept a folder.

Where the boundaries are

An agent can tell you what the property is worth today and what a sale would look like. An agent cannot tell you what your basis is, what your gain would be, or whether a sale is a good tax decision. Those questions belong with a CPA or tax counsel, and in estates with any complexity, with your probate attorney as well.

The useful thing a family can do is make the professionals job possible: obtain and keep the date-of-death valuation, keep the improvement records, and ask the tax question before the decision rather than after it.

For the surrounding steps, start at the probate hub. For anything involving basis, gain, or the tax treatment of a sale, work with a CPA on the facts of your own family.

Anthony Grynchal has been licensed in California since November 2009.