Illinois Estate Tax and the $4 Million Cliff: What Farm Families Need to Check Before Year End
The Illinois Estate Tax Is Not the Federal Estate Tax
Most farm families who have done any estate planning in the last several years have heard about the federal estate tax exemption and concluded that their estate is well below the threshold. For 2026, the federal exemption is $15 million per individual, or $30 million for a married couple using portability. At current farmland prices in Illinois, it takes a very large operation to approach that number, and most families in central and western Illinois are nowhere near it.
The Illinois estate tax is a different calculation entirely. The Illinois exemption is $4 million per individual, and that exemption is not portable between spouses. A married couple cannot combine their exemptions the way they can under federal law. Each person has $4 million — and no more — when their estate is valued at death. A farm worth $5 million titled entirely in the name of one spouse leaves an estate that owes Illinois estate tax on approximately $1 million, at rates that produce a tax bill in the range of $100,000 to $150,000 depending on the bracket.
What makes the Illinois estate tax a farm problem specifically is that farmland values in Illinois have risen enough over the last 15 years to push estates that were previously well below the threshold into territory where the tax is real. A landowner who acquired 300 acres in Menard or Mason County 30 years ago at $1,500 per acre is now looking at an estate value of $3.5 million or more on that ground alone, before any other assets.
How Land Values Translate Into an Estate Tax Problem
The math is not complicated. If you own 400 acres of central Illinois farmland with a current market value of $13,000 per acre, that parcel alone is worth $5.2 million. Add a residence, farm equipment, retirement accounts, and other assets, and a single landowner could easily have a taxable Illinois estate of $6 to $7 million. The Illinois estate tax on $6 million — with a $4 million exemption — applies to the entire $6 million at graduated rates starting at 0.8 percent, reaching 16 percent at the top bracket, and producing an effective tax well above the simple bracket math suggests when you account for the way Illinois computes tax on the full estate above the threshold.
The practical number that matters: an Illinois estate of $5 million owed roughly $285,000 in Illinois estate tax under the current statute. An estate of $7 million could owe $400,000 or more. Those are real numbers — and they are not hypotheticals for large farming operations. They are the actual situation for a landowner who acquired 300 to 500 acres over a career and has not reviewed the estate plan since the land was worth less.
None of this means the tax cannot be managed. Illinois has several mechanisms that can reduce or defer the estate tax on qualifying agricultural property, and a well-structured estate plan that accounts for the Illinois threshold can dramatically reduce the exposure. The problem is that most of these mechanisms require planning that happens before death — not after.
Why the First Spouse's Death Is the Critical Moment
Because the Illinois exemption is not portable, the most important planning decision for a married farm couple happens before the first spouse dies. Under federal law, a surviving spouse can elect to use the deceased spouse's unused exemption — portability — and effectively shield up to $30 million in assets from federal tax. Illinois has no equivalent mechanism. The $4 million exemption that belongs to the first spouse to die is gone if it is not used.
This means that a farm couple with $8 million in assets who does nothing before the first death loses the first spouse's exemption entirely. The surviving spouse's estate then faces a $4 million Illinois taxable estate, and everything above that threshold is taxed on the survivor's death. A plan that uses bypass trusts, family limited partnerships, gifting programs, or annual exclusion gifts while both spouses are living can preserve both exemptions and reduce the ultimate tax significantly.
The structure that works best depends on the family situation — how many children, whether any of them farm, what the liquidity looks like, and whether a sale of part of the ground is acceptable to settle the estate. An attorney who works in Illinois agricultural estate planning is the right person to build the specific structure. What I can tell a landowner is that the conversation needs to happen before the need is urgent.
What to Do Before Year End
October and November are when most Illinois farm families schedule the estate planning meeting they have been putting off. If you have not had that meeting with an Illinois estate attorney and your CPA in the last three years, and if your farmland has appreciated significantly since your last plan was reviewed, this fall is the time to get it on the calendar. The Illinois estate tax threshold has not changed recently, but the land values that determine who it applies to have.
Get a current appraisal or a broker opinion of value on your ground before the meeting. An attorney or CPA cannot design an estate plan around a number you last estimated three years ago. The planning process starts with an accurate picture of what the estate is worth, and that picture changes every time the market moves.
Call Archer Realty if you need a broker opinion of value on Illinois farmland or recreational property as part of an estate planning process. We serve Menard, Sangamon, Mason, Cass, Adams, and neighboring counties, and we work regularly with attorneys and CPAs on estate and succession planning situations.
Jared Williams is the Managing Broker and owner of Archer Realty & Auction LLC. He serves on the Menard County Board of Review and works with farm families on land valuation for estate planning purposes. Start the conversation at archerrealty.net.
