Illinois is a top 20 oil producing state with a long history of energy extraction. The earliest attempt to drill for oil occurred near Champaign in 1853, yielding only swamp gas. Commercial production formally began in 1905, resulting in 181,000 barrels out of the ground that year. Since then, operators have drilled roughly 155,000 oil, gas, and injection wells across the state.

Currently, the Illinois Department of Natural Resources reports 23,402 active oil and gas production wells, alongside 6,535 injection wells and 1,078 gas storage wells. Most of this infrastructure sits in the southern part of the state. These wells extract from the broader geologic province known as the Illinois Basin, which extends into western Kentucky and western Indiana.

Families holding mineral rights in these 40 producing counties manage a different type of asset than a high volume shale interest in Texas or North Dakota. The Illinois Basin is a mature producing region. Administering these assets requires an assessment of low volume well economics, state severance tax laws, and the probate mechanics necessary to clear title across generations.

Economics of a 1.5 barrel a day well

Modern Illinois Basin wells produce low daily volumes. According to the state, most wells in Illinois qualify as :stripper wells with an average daily production of 1.5 barrels per day.

Historical data from the U.S. Energy Information Administration details this production curve. In the mid 1980s, Illinois field production of crude oil peaked at over 30 million barrels a year. By the late 1990s, annual production dropped to around 12 million barrels. Throughout the 2000s and 2010s, output hovered between 8 and 12 million barrels. By the early 2020s, statewide production fell near 6.6 million barrels annually.

When a well produces 1.5 barrels of oil a day, the operator manages a narrow financial margin. The operator must pay for maintenance, electricity for the pumpjack, saltwater disposal, and regulatory compliance out of a small gross revenue pool. For the mineral owner, a fractional royalty interest in a well producing 45 barrels a month translates to small monthly or quarterly checks.

Future royalty income relies on wells that will continue to age. While new drilling still occurs, with the state issuing an average of 435 drilling permits per year between 2015 and 2023, a new well in a mature basin typically produces at lower initial rates than the legacy wells drilled decades ago.

We explored the mechanics of aging wellbores in What Happens to Your Royalties When the Well Depletes?. An Illinois mineral owner evaluating these assets must calculate how many years of low volume production it takes to equal a lump sum offered by a buyer today.

How the Illinois Severance Tax Act affects check stubs

Mineral owners reviewing royalty statements frequently encounter deductions lowering their net pay. In Illinois, one specific statutory deduction comes from the Illinois Hydraulic Fracturing Tax Act (86 Ill. Admin. Code 475).

The Tax Act imposes a tax on the severance and production of oil and gas from wells permitted under the state’s Hydraulic Fracturing Regulatory Act. The law places the tax burden on the producers, a category that includes royalty owners. The statute requires the first purchaser of the oil or gas to collect the tax by deducting it from the payment. If the operator transports the oil off the production unit directly, the operator is responsible for registering with the Department of Revenue and withholding the tax.

The statute contains an exemption for legacy assets. The tax does not apply to oil and gas severed from wells that commenced production prior to July 1, 2013, unless those wells were subsequently permitted under the Regulatory Act.

For these older wells, first purchasers and operators do not withhold the tax. The state updated the administrative requirements recently. If a first purchaser entered into a new contract with an operator on or after January 1, 2019, to buy oil from a well that commenced production before July 1, 2013, the purchaser must obtain a specific exemption certificate.

These effective dates explain why two different wells in the same county might show different tax treatments on a single check stub.

County probate and releasing suspended funds

Operators frequently suspend royalty payments when a mineral owner dies. The operator places the money in a suspense account until the legal heirs provide documentation proving their rightful ownership.

Under 755 ILCS 5/25-1, Illinois provides a Small Estate Affidavit process to transfer personal estate property without letters of office. This process allows families to bypass a formal probate proceeding in the county where the minerals are located.

To use this affidavit to claim :suspended funds, the estate must meet specific criteria. No letters of office can be outstanding on the decedent’s estate, and no petition for letters can be pending. The gross value of the decedent’s personal estate, excluding motor vehicles registered with the Secretary of State, must not exceed $150,000.

The affiant, typically an heir, swears under oath that all funeral expenses and debts are paid, or they list the unpaid debts in a strict statutory hierarchy. The law requires the estate to pay claims in this exact order before distributing money to the heirs:

  1. Funeral and burial expenses, administration expenses, and statutory custodial claims.
  2. The surviving spouse’s or child’s award.
  3. Debts due to the United States.
  4. Money due to employees of the decedent up to $800 per claimant for services rendered within four months prior to death.
  5. Money and property received or held in trust by the decedent which cannot be identified or traced.
  6. Debts due to the State of Illinois and any county, township, city, town, village, or school district located within Illinois.
  7. All other claims.

The affiant takes on the legal responsibility to pay these claims pro rata if the estate is insufficient to cover a full class.

Heirs must record the proper documentation in the exact jurisdiction where the wells reside. The State of Illinois Office of the Illinois Courts maintains a network of Circuit Court Clerks across every county, including Adams County, Bond County, Crawford County, and Ogle County.

As mineral interests pass through generations, the fractional percentages become smaller. The administrative work of locating the correct circuit clerk, filing a Small Estate Affidavit, assuming liability for the estate’s debts, and contacting the operator to release a few hundred dollars in suspended funds sometimes outweighs the financial benefit. We detailed a similar administrative burden in Illinois’ “Missing Owner” Trap.

Evaluating the sale of Illinois mineral rights

Holding a mineral asset requires accepting production decline, fluctuating commodity prices, operator decisions, and the risk that future drilling never occurs.

Selling minerals trades future uncertainty for immediate capital. The buyer pays for upfront liquidity and assumes the commodity risk, the decline risk, and the administrative burden of dealing with operators and county clerks.

If an inherited interest generates $1,200 a year and a buyer offers $36,000 for it, the offer equals 30 years of current royalty income paid upfront. Obtaining a valuation provides a concrete number for an asset that has passed through the family for decades without a price attached to it.

An owner with 20 net mineral acres can sell 10 acres and keep 10 acres. This strategy creates immediate liquidity while preserving a portion of the future revenue. We outlined how these mechanics work in The All-or-Nothing Myth: Selling Partial Rights.

Two mineral owners in the same Illinois county can receive different offers. One tract might have steady production from a reliable operator, while another tract five miles away has aging wells on the brink of being plugged. Determining real value requires an examination of the exact legal description, the royalty rate, the production history, and the title. A generic price per acre estimate cannot account for these variables.

A buyer evaluates these metrics to calculate the acreage and arrive at a price before executing clear transfer documents and funding the transaction. The decision to hold or sell relies on a comparison between available capital today and potential income years from now.

:stripper-wells

Stripper wells are oil or gas wells producing at low volumes, generally nearing the end of their economically viable lifespan. In Illinois, state authorities classify most local wells in this category based on an average output of about 1.5 barrels per day. Operators maintain them by minimizing maintenance and operational costs until the revenue drops below the expense of bringing the fluid to the surface.

:suspended-funds

Suspended funds are royalty payments that an oil and gas operator holds in an escrow style account rather than mailing to the owner. Operators utilize these accounts when they lose contact with the owner, discover a defect in the property title, or learn the owner has passed away. The operator retains the money but will not release it until the heirs provide clear legal documentation, such as a probate order or a qualifying small estate affidavit.