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Illinois Mortgage Calculator

Use this free Illinois mortgage calculator to estimate your monthly mortgage payments and annual amortization.

Loan details

%

Monthly payment

$2,100

at 6.80% · 30-year fixed

  • Principal & interest

    $1,565

  • Property taxes

    $375

  • Homeowners insurance

    $160

Loan amount

$240,000

Total interest paid

$323,263

Payoff date

—

YOU'RE KEEPING $20,288

$20,288

stays in your pocket

That's your total savings over 30 years at today's best rate on NerdWallet (6.80%) vs. the 7.15% national average — $56 less every month.

  • Today's best rate: 6.80%

  • Get your free rate with no credit impact

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No impact to your credit score

Calculated payments and savings are estimates. The calculator result does not constitute an offer for a loan and will not solicit a loan offer. Savings will depend on the actual amounts and rate for which you are approved, should you choose to apply.

Taking Out a Mortgage in Illinois

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Last updated November 19, 2025
In Illinois, the Land of Lincoln, housing affordability varies by region but is generally near the U.S. average.
Cook County is the most populated county in Illinois, home to Chicago. The typical monthly mortgage payment for a median-priced home reached $2,117 in Q1 2025, based on a median home value of $361,259, according to the National Association of Realtors.
By comparison, the national median was $2,120 for a single-family home valued at $402,300.
Winnnebago County, by contrast,is more affordable, with a typical monthly payment of $1,114 on a median home valued at $190,018.

Illinois's first-time home buyer programs

The Illinois Housing Development Authority, or IHDA, offers several loan programs to help qualified first-time home buyers get a mortgage.
» MORE: First-time home buyer programs by state

Average property tax by county

Taking U.S. Census data, NerdWallet has crunched the numbers to help you understand what property tax rate you can expect to pay on your future home in Illinois. Because assessed values aren't frequently updated, you may pay a higher rate at first but eventually you'll pay a similar rate.

CountyAvg. property tax rateMedian home value
Adams County1.55%$151,300
Alexander County1.16%$58,600
Bond County1.68%$130,300
Boone County2.15%$181,700
Brown County1.48%$122,100
Bureau County1.76%$120,200
Calhoun County1.26%$160,900
Carroll County1.76%$109,900
Cass County1.66%$92,000
Champaign County2.12%$199,100
Christian County1.67%$108,800
Clark County1.59%$112,400
Clay County1.14%$103,600
Clinton County1.80%$171,500
Coles County1.81%$114,000
Cook County1.77%$301,400
Crawford County1.49%$108,200
Cumberland County1.46%$116,000
De Witt County1.70%$121,100
DeKalb County2.38%$227,400
Douglas County1.68%$137,100
DuPage County1.99%$364,900
Edgar County1.49%$94,100
Edwards County1.27%$92,700
Effingham County1.40%$166,500
Fayette County1.32%$111,500
Ford County1.89%$113,400
Franklin County1.26%$87,500
Fulton County1.73%$99,800
Gallatin County0.94%$81,000
Greene County1.37%$92,400
Grundy County1.92%$245,400
Hamilton County1.21%$100,300
Hancock County1.57%$104,200
Hardin County1.01%$90,600
Henderson County1.54%$99,800
Henry County1.87%$138,900
Iroquois County1.65%$120,900
Jackson County1.87%$123,400
Jasper County1.29%$117,900
Jefferson County1.58%$115,000
Jersey County1.59%$161,800
Jo Daviess County1.64%$179,300
Johnson County1.41%$141,200
Kane County2.35%$307,600
Kankakee County2.09%$198,400
Kendall County2.49%$311,500
Knox County1.89%$96,800
Lake County2.38%$327,800
LaSalle County1.99%$157,100
Lawrence County0.97%$93,900
Lee County1.91%$147,100
Livingston County2.01%$128,100
Logan County1.80%$118,200
Macon County2.01%$108,900
Macoupin County1.43%$121,300
Madison County1.87%$170,500
Marion County1.59%$96,200
Marshall County1.75%$124,600
Mason County2.02%$97,000
Massac County1.45%$115,200
McDonough County1.88%$100,400
McHenry County2.50%$292,400
McLean County2.23%$190,900
Menard County1.71%$177,100
Mercer County1.81%$131,000
Monroe County1.54%$254,100
Montgomery County1.67%$102,000
Morgan County1.81%$122,000
Moultrie County1.73%$116,400
Ogle County1.82%$172,900
Peoria County2.26%$155,800
Perry County1.43%$102,000
Piatt County1.67%$168,300
Pike County1.52%$97,000
Pope County1.07%$137,500
Pulaski County1.05%$81,600
Putnam County1.67%$161,500
Randolph County1.24%$129,400
Richland County1.31%$106,400
Rock Island County2.15%$138,400
Saline County1.65%$87,900
Sangamon County1.95%$160,500
Schuyler County1.51%$100,500
Scott County1.39%$95,000
Shelby County1.39%$125,200
St. Clair County1.94%$170,100
Stark County1.66%$95,900
Stephenson County2.15%$122,000
Tazewell County2.04%$157,800
Union County1.28%$129,300
Vermilion County1.69%$93,700
Wabash County1.43%$94,100
Warren County1.40%$98,200
Washington County1.75%$147,100
Wayne County1.37%$107,900
White County1.10%$101,000
Whiteside County1.86%$122,200
Will County2.27%$300,900
Williamson County1.55%$155,100
Winnebago County2.46%$161,600
Woodford County1.98%$186,100
Source: American Communities Survey 2022, U.S. Census

How to use the mortgage calculator

To use our mortgage calculator, add your details to the following fields:
1. Home price: What you're hoping to spend on a home.
2. ZIP code: The home's location.
3. Down payment: How much cash you're paying upfront towards the home's price. This calculator defaults to showing a 20% down payment, but you can adjust it up or down by changing the dollar amount or the percentage. This calculator assumes you're using a conventional loan, so it will automatically add private mortgage insurance if the down payment amount is less than 20%.
4. Loan term: The default is 30 years, but you can also choose a shorter term.
5. Interest rate: Use today's average APR, enter the rate you've been quoted or use the lowest APR NerdWallet partners are offering today.
That's the least you can do. To get more accurate results, fill in the following four categories. (Estimates are fine, but this goes over how to get more specific numbers.)
6. Property taxes (per year): This is autofilled with an estimate, but property taxes vary tremendously throughout the country. Get more precise by looking up the tax rate where you're planning to buy or looking at the tax history for the home you're interested in. You can change the property tax amount by editing the dollar amount or the percentage.
7. Homeowners insurance (per year): Mortgage lenders require borrowers to have homeowners insurance. Not sure what you might pay? This calculator puts in an estimate, but you can use NerdWallet's home insurance calculator to fine-tune it. All you need to know is the property location and the rough amount you'd be looking to insure — use the home's price as a proxy.
8. HOA fees: If the home is part of a homeowners association, put the monthly dues here. (The calculator default is no HOA costs.) This is also information you can likely crib from a home's listing. One other note, if there are HOA fees but you're going to pay them directly rather than with an escrow account, you can omit them here.
9. PMI (monthly): If you've entered a down payment amount under 20%, this will autofill, since the calculator assumes you're using a conventional loan. PMI is tied to your credit score, so if you want a more accurate figure, pop over to NerdWallet's PMI calculator. If you're using a VA loan, you can zero this out, since VA loans do not require mortgage insurance. On the other hand, if you're getting an FHA loan, you'll have to pay mortgage insurance premiums regardless of your down payment amount. For more accurate payment info, use our FHA mortgage calculator.
The calculator's results will update as you adjust the numbers in these fields. The results show you the monthly payment, as well as:
  • Loan amount: How much you're actually borrowing in principal.
  • Total interest paid: How much interest you will pay over the life of the mortgage if you keep it until its term ends. (Most people sell or refinance well before that point, but it's still interesting info.)
  • Payoff date: If you kept the same loan for its entire term, here's the month and year when you'd own the home free and clear.
There's also a simple annual amortization schedule. Amortization shows how your mortgage payment changes over time. Even though the principal and interest payment doesn't change with a fixed-rate mortgage, the percentage of that payment that's going toward each component does. At the beginning of the loan, more goes toward interest; the closer to the end of the loan's term, the more of the payment goes toward principal. If you want a more detailed month-by-month look, yes, NerdWallet has an amortization calculator, too.
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CONSIDERING A REFI? If you're looking to see how much you could save by refinancing your mortgage, try NerdWallet's refinance calculator.
» MORE FOR CANADIAN READERS: Canada mortgage payment calculator