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Mortgage Calculator Illinois
Illinois routinely ranks among the two or three highest property tax states in the country — and unlike Texas or Florida, there's no "no income tax" trade-off softening the blow. This calculator builds in a realistic Illinois tax rate from the start.
Estimate your Illinois mortgage payment
Updates liveIllustrative estimate only. Illinois property tax varies by county and taxing district — confirm your exact local rate before finalizing a budget. Not a loan offer or financial advice.
Diagram: unlike states that trade high property tax for no income tax, Illinois carries a real burden on both fronts.
Who checks this calculator
Understanding the Illinois mortgage market
What makes an Illinois mortgage different
Illinois consistently sits among the highest property tax states in the country, and unlike Texas or New Hampshire, there's no missing income tax to explain why. This mortgage calculator Illinois buyers use puts both pieces together for a clearer budgeting picture.
Why Illinois property tax runs so high
Illinois has more than 6,000 separate local taxing bodies — school districts, municipalities, park districts, library districts, and more — many with independent authority to levy their own property tax. Combined with comparatively limited state-level funding for schools relative to many other states, this pushes local property tax to carry an unusually large share of the total funding burden, which shows up directly in an effective statewide rate that consistently ranks among the two or three highest in the country, commonly cited around 2%.
No income tax offset, unlike other high-tax states
This is the detail that separates Illinois from other high-property-tax states in a real, meaningful way. Texas and New Hampshire, for instance, both carry high property tax but have no state income tax at all — a genuine trade-off that softens the overall picture. Illinois has a flat state income tax on top of its high property tax, per the Illinois Department of Revenue, meaning homeowners here face a real, ongoing cost on both fronts at once, without the offsetting relief some other high-property-tax states provide. Any mortgage calculator Illinois residents actually trust has to reflect that double hit.
| State | Approx. property tax | State income tax |
|---|---|---|
| Illinois | ~1.95% – 2.10% | Yes, flat rate |
| Texas | ~1.60% – 1.80% | None |
| New Hampshire | ~1.85% – 2.10% | None (on wages) |
| Hawaii | ~0.27% – 0.29% | Yes, graduated |
Cook County's triennial reassessment
Cook County, home to Chicago and a large share of the state's population, reassesses property values on a triennial cycle — roughly one-third of the county is reassessed each year, rotating through city, north suburbs, and south suburbs over a three-year period, rather than the entire county being reassessed all at once. This staggered system means the timing of when your specific area was last reassessed can affect how closely your assessed value tracks current market value at any given moment.
The PTELL tax cap, explained
The Property Tax Extension Limitation Law (PTELL) — often just called the "tax cap" — limits how much a taxing district's total property tax collections can grow year over year in counties where it applies, generally to 5% or the rate of inflation, whichever is lower. It's important to understand what this actually caps: it's the district's total levy, not any individual homeowner's specific bill, which can still shift based on how the local assessment roll changes even while the district's overall collection stays within the capped growth.
Homestead and other exemptions
Illinois offers a general homestead exemption that reduces the equalized assessed value of an owner-occupied primary residence, directly lowering the tax bill. On top of that, additional exemptions stack for senior homeowners, disabled homeowners, and veterans, each further reducing taxable value. These exemptions typically need to be applied for through the county assessor's office and aren't automatically applied the moment you close on a home.
A worked example, start to finish. Say a buyer purchases a $290,000 home in an Illinois suburb with an effective property tax rate of 2.0%. With a 10% down payment, they're financing $261,000 at 6.6% over 30 years, giving a principal and interest payment of roughly $1,667.
Property tax on the $290,000 purchase price adds about $483 a month — easily the largest non-principal-and-interest line item on this bill, well above what a comparable buyer in most other states would see. Add a typical Illinois insurance premium of around $133 a month, and the full payment comes to roughly $2,225.
Once this buyer files their general homestead exemption, next year's taxable value drops with the exemption applied, offering some ongoing relief — though the overall rate stays noticeably higher than most of the country, which is worth building into a long-term Illinois homeownership budget rather than treating as a one-time surprise.
How to use this mortgage calculator Illinois tool
Enter the home price and down payment you're working with, along with your expected interest rate and loan term. The property tax rate defaults to a typical statewide figure of 2.0% — adjust it if you know your specific county and taxing district's actual combined rate, which your real estate agent or county assessor's office can confirm. Add an estimated annual insurance premium, and this mortgage calculator Illinois shows your full estimated monthly payment.
Common mistakes to avoid
- Comparing Illinois to Texas without checking the income tax difference. Illinois carries both a real property tax and a real income tax.
- Assuming PTELL caps your individual bill. It caps the district's total levy, not any single homeowner's specific number.
- Not filing for homestead and other eligible exemptions. These require an application and aren't automatic.
- Ignoring Cook County's reassessment timing. Your specific area's position in the triennial cycle affects how current your assessment is.
- Using a low out-of-state comparison as your budget baseline. Illinois' tax reality is quite different from most of the country.
Quick glossary
- Taxing district
- A local government body — school, park, library or municipal district — with independent authority to levy property tax in Illinois.
- Equalized assessed value (EAV)
- A property's assessed value after a state equalization factor is applied, used as the base for calculating Illinois property tax.
- PTELL (tax cap)
- The Property Tax Extension Limitation Law, capping annual growth in a taxing district's total property tax collections.
- Triennial reassessment
- Cook County's three-year rotating cycle for reassessing property values by geographic area.
- General homestead exemption
- A reduction in equalized assessed value for an owner-occupied Illinois primary residence.
The bottom line
Illinois property tax is truly among the highest in the country, and — unlike some other high-tax states — there's no missing income tax to soften the overall picture. Confirm your specific county and taxing district's rate, file for every exemption you're eligible for, and this mortgage calculator Illinois gives you a realistic starting point for what owning a home here actually costs each month.
Common questions