Tax Strategies
Capital Gains Tax on Inherited Property
How the stepped-up basis rule changes capital gains tax on inherited Illinois real estate, and when heirs can use a 1031 exchange on the property they receive.
Heirs who inherit real estate in Illinois are often relieved to learn how little tax they actually owe if they sell soon after inheriting, and the reason comes down to one rule: stepped-up basis. Instead of using what the original owner paid decades ago, the tax code generally resets the property's basis to its fair market value on the date of death. A downstate farm parcel a parent bought in 1975 for $40,000 an acre-equivalent price and that is worth far more today passes to heirs with a basis at today's value, not the original purchase price. That single rule wipes out decades of paper gain that would otherwise have been fully taxable if the original owner had sold the property themselves.
01
Why Stepped-Up Basis Changes the Math So Much
Because basis resets at death, an heir who sells an inherited Decatur duplex within a year or two of the date of death often has little or no taxable gain, since the sale price is close to the value already used as basis. This is a very different position than the person who originally owned the property would have been in, since decades of appreciation that would have been taxable to the original owner simply do not carry over to the heir under current law. This is one of the few areas of the tax code where holding an asset until death actually produces a better outcome than selling it during the owner's lifetime, which is why estate planning conversations often revolve around exactly this timing question.
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When Inherited Property Still Generates a Real Tax Bill
The stepped-up basis benefit shrinks the longer an heir holds the property before selling, since any appreciation after the date of death is taxable in the normal way. An heir who inherits a Bloomington rental building and holds it for eight years while it continues appreciating owes capital gains tax on the growth that happened during that eight-year hold, even though the original decades of appreciation under the deceased owner were never taxed at all. The clock on that post-inheritance growth starts the day the estate settles, not the day the heir finally decides to list the property, so the true holding period can be longer than an heir realizes if probate or a family disagreement delays the sale.
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Using a 1031 Exchange on Inherited Investment Property
If the inherited property is held for investment or business use, such as farmland, a rental building, or a commercial property, it is generally eligible for a 1031 exchange the same as any other investment property, since the exchange rules look at how the property is used going forward rather than how it was acquired. An heir who inherits downstate farmland but has no interest in farming it directly could exchange into a different investment property, such as a Springfield industrial building or a DST interest, deferring tax on any post-inheritance appreciation while stepping away from active property management.
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What Multiple Heirs Should Sort Out First
Inherited property is frequently owned by several siblings or family members as tenants in common, and a 1031 exchange generally has to be executed by each individual owner separately if they want to go different directions, since one heir cannot exchange on behalf of another who wants to simply cash out. Getting clear on who wants to sell, who wants to exchange, and who wants to hold, before the property goes to market, avoids a scramble to restructure ownership after an offer is already in hand. A qualified intermediary and estate attorney working together early on can usually find a structure that lets each heir pursue their own preference without holding up the others.
Questions
Common questions
Does stepped-up basis apply to all inherited Illinois property?
It generally applies to property passed through an estate at death, though the specific mechanics can vary for property held in certain trusts, so an estate attorney should confirm how a particular inheritance was structured before an heir relies on the assumption.
How is fair market value at death determined for a stepped-up basis calculation?
Usually through a formal appraisal dated near the date of death, which becomes important documentation if the property is sold years later and the basis is ever questioned.
Can an heir do a 1031 exchange if siblings who co-inherited the property want to sell instead?
Generally yes for that heir's individual share, but it requires the property to be structured so each co-owner can go their own direction, which sometimes means splitting the property or its sale proceeds before the exchange is set up.
Does Illinois have a separate inheritance or estate tax on top of federal rules?
Illinois has its own estate tax that applies at the estate level above a certain exemption threshold, which is separate from the capital gains tax an heir may later owe when they sell the inherited property.
What if the inherited property has been in the family for generations with no clear original purchase price?
Stepped-up basis solves most of this problem, since the relevant basis is the fair market value at the most recent date of death, not the original purchase price from generations earlier.
Ready to see how capital gains tax on inherited property fits your Illinois 1031 exchange? Talk through the timeline, replacement options, and documentation before the identification clock starts.
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