What the Will County Tax Assessor does

The Will County Tax Assessor is an elected official who determines the assessed value of all real property in Will County for tax purposes. This office does not set your tax bill itself — that comes from your local tax rate — but the assessed value they assign is the foundation every property tax bill is built on. If you own land or a building in Will County, the Assessor's office has created a record of it, estimated its market value, and assigned it a classification that affects your tax rate.

The Assessor's office maintains property records, conducts inspections, hears appeals when you disagree with their valuation, and produces the assessment roll that goes to your local taxing bodies each year. They are required by Illinois law to reassess all properties in the county on a four-year cycle, meaning your property will be formally revalued roughly every four years, though the office updates records continuously as properties change hands or are improved.

Key Takeaways

  • The Will County Tax Assessor determines the assessed value of your property, which is multiplied by your local tax rate to produce your property tax bill.
  • Properties are reassessed on a four-year cycle under Illinois law, and you can file a formal objection if you believe the assessed value is too high.
  • The Assessor's office is located in Joliet and maintains public records you can search online or request in person.
  • If you disagree with your assessment, you must file an objection within a specific timeframe — usually 30 days after receiving your assessment notice.
  • Exemptions for seniors, veterans, disabled persons, and agricultural land are handled by the Assessor's office and must be requested separately.

How property assessment works in Will County

The Assessor assigns each property a market value estimate based on comparable sales, property condition, location, and other factors. That value is then multiplied by an assessment rate set by Illinois law — currently 33.33 percent for most residential properties — to produce the assessed value. Your local tax rate (set by your school district, municipality, and other taxing bodies) is then applied to that assessed value to calculate your tax bill.

The four-year reassessment cycle means your property is formally revalued once every four years. However, the office updates records year-round when properties sell, are improved, or change use. If you make a major addition to your home or convert a garage to living space, the Assessor may adjust your assessment in the year after the work is completed, even if your four-year cycle has not yet come due.

You can view your property record and current assessment online through the Will County Assessor's website. The record shows the assessed value, property classification, square footage, lot size, and other details the office uses to calculate your tax. If you believe the information is incorrect — for example, if the square footage is wrong or an improvement is listed that you never made — you can request a correction.

Filing an objection to your assessment

If you believe your assessed value is too high, you can file a formal objection with the Will County Board of Review. You must file within 30 days of receiving your assessment notice. The Board of Review is a separate body from the Assessor's office and hears objections from property owners. You do not need a lawyer, and you do not need to hire an appraiser, though some owners do.

To file an objection, contact the Will County Board of Review office in Joliet. You will need to provide your property address, parcel number (found on your assessment notice or online), and the reason you believe the assessment is incorrect. Common reasons include: the assessed value is higher than recent comparable sales in your area, the property record contains errors (wrong square footage, wrong number of bedrooms), or the property condition has declined since the last assessment.

The Board of Review will schedule a hearing, usually several months after you file. You can present evidence — recent appraisals, comparable sales data, photos of property condition — to support your case. If the Board agrees your assessment is too high, they will lower it. If they do not, you can appeal further to the Illinois Property Tax Appeal Board, though this step is less common and involves additional filing requirements and fees.

Exemptions and special assessments

The Will County Tax Assessor's office administers several exemptions that can reduce your assessed value or remove it entirely. These include the homeowner exemption (for primary residences), senior exemption (age 65 and older), disabled person exemption, veteran exemption, and agricultural exemption. Each has different income limits and documentation requirements.

To request an exemption, you must file a form with the Assessor's office, usually by a deadline in early spring (typically March or April, though dates vary by exemption type). You will need to provide proof of your status — for example, a birth certificate or ID for age verification, a disability information letter from Social Security or the VA, or a deed showing agricultural use. The Assessor's office will review your request and notify you whether the exemption was granted.

Exemptions are not automatic. Even if you may have access to, you must request them each year or every few years depending on the exemption type. If you received an exemption in the past but did not request it this year, it may have expired. Check your assessment notice to see which exemptions, if any, are currently applied to your property.

Contacting the Will County Tax Assessor

The Will County Tax Assessor's office is located in Joliet and can be reached by phone, mail, or in person. The office maintains a searchable property database online where you can look up your parcel number, view your assessment, and see the property record the Assessor maintains. You can also request copies of documents, ask questions about your assessment, or request a correction to property information.

If you have questions about your assessment, the first step is to contact the Assessor's office directly. Staff can explain how your value was calculated, clarify what information is in your record, and tell you the deadline for filing an objection. If you believe the record contains an error — such as an incorrect square footage or a building that does not exist — the office can often correct it without requiring a formal objection.

Understanding your assessment notice

Your assessment notice lists your property address, parcel number, assessed value, property classification, and exemptions (if any). It also shows the date you received it and the deadline for filing an objection — usually 30 days from the notice date. Keep this notice; you will need the parcel number to file an objection or to look up your record online.

The notice may also show the previous year's assessed value, allowing you to see whether your assessment increased, decreased, or stayed the same. A significant increase does not automatically mean the assessment is wrong — property values change, and the Assessor adjusts assessments accordingly. However, if you believe the increase is not justified by market conditions or property condition in your area, that is a valid reason to file an objection.

Frequently Asked Questions

How often does the Will County Tax Assessor reassess properties?

Properties are formally reassessed on a four-year cycle under Illinois law. However, the Assessor updates records year-round when properties sell, are improved, or change use. If you make a major renovation, the office may adjust your assessment in the following year even if your four-year cycle has not yet come due.

Can I lower my property tax bill by lowering my assessed value?

Yes. Your property tax bill is calculated by multiplying your assessed value by your local tax rate. If you successfully object to your assessed value and have it lowered, your tax bill will decrease proportionally. However, lowering your assessed value does not affect the tax rate itself — only the amount the rate is applied to.

What happens if I miss the deadline to file an objection?

If you miss the 30-day objection deadline, you generally cannot file with the Board of Review for that year. However, you may still contact the Assessor's office to request a correction if the property record contains a factual error, such as wrong square footage. Some errors can be corrected outside the objection process.

Do I need to hire an appraiser to file an objection?

No. You can file an objection on your own and present evidence yourself at the Board of Review hearing. Many owners use comparable sales data from recent property sales in their neighborhood, photos, or inspection reports. Some hire appraisers for more complex cases, but it is not required.

How do I know if I may have access to for a property tax exemption?

Common exemptions include the homeowner exemption (primary residence), senior exemption (age 65 and older), disabled person exemption, and veteran exemption. Each has different requirements. Contact the Will County Tax Assessor's office or visit their website to learn the specific income limits and documentation needed for each exemption type.