Chicago · Cook County, Illinois · Updated September 2026
Your building went up in value. Your refinance just got smaller. In Cook County, both of those can be true at once, and the reason is a tax bill that arrives a year after the reassessment that caused it.
By Michael McGovern, Founder | 25+ Years in Commercial LendingCommercial Mortgage Connection · Lending in all 50 states The short answer
Every commercial refinance Chicago lenders approve is sized on net operating income, and property tax is one of the largest expenses a lender subtracts. When Cook County reassesses your building at a higher value, the tax rises, the income falls, and the loan a lender will offer at the same debt service coverage ratio falls by roughly ten dollars for every dollar of new annual tax. On the example in this guide, a building whose market value rose by $2,000,000 qualifies for about $960,000 less debt.
- Commercial pays 2.5 times harder. Cook County assesses commercial property at 25 percent of market value and residential at 10 percent, the widest gap the Illinois Constitution allows.
- The bill arrives late. Taxes are paid in arrears, so your trailing twelve months can still show the old tax while a lender underwrites the new one.
- Chicago's clock is known. The city was reassessed in 2024 and is next reassessed in 2027. A refinance today should be underwritten with that date in mind.
- An appeal is part of the plan, not an afterthought. A successful appeal before you apply can be worth more than a better rate.
Every tax rate, loan figure and ratio below is a labeled example checked 29 September 2026. None of it is a quote, an offer, or tax advice. Call 888-656-9812 to run your own building.
What this page covers
- How a Cook County reassessment reaches your loan
- Why commercial property feels it 2.5 times harder
- What a $91,065 tax increase does to a refinance
- The arrears trap in your trailing twelve months
- Refinancing before or after the 2027 reassessment
- Appeal before you apply
- What a Chicago lender will actually underwrite
- Loan options when the tax bill jumps
- When refinancing now is the wrong move
- Commercial refinance Chicago FAQ
How a Cook County reassessment reaches your loan
Most owners think of a reassessment as a tax problem. For anyone planning a commercial refinance in Chicago, it is a loan-sizing problem first, and the chain from one to the other has five links.
Market value. The Cook County Assessor estimates what your property would sell for. Cook County reassesses on a three-year rotation: the City of Chicago, then the north suburbs, then the south and west suburbs. Chicago was last reassessed in 2024.
Assessment level. The county does not tax the full market value. It applies a percentage set by county ordinance, which depends on the property's class. That percentage is where commercial and residential owners part ways, covered in the next section.
Equalization. The Illinois Department of Revenue then applies a statewide equalization factor, often called the multiplier, to bring Cook County's assessments in line with the rest of the state. The final factor for tax year 2024 was 3.0355.
Tax rate. The Cook County Clerk calculates a composite rate from the levies of every taxing district that covers your parcel: the city, schools, parks, the county and others.
Your lender. The resulting bill is an operating expense. It comes straight out of net operating income, and net operating income is what a commercial lender sizes your loan on. That last link is the one owners miss.
Why commercial property feels it 2.5 times harder
Cook County's classification ordinance assesses most residential property, including apartment buildings, at 10 percent of market value. It assesses commercial property at 25 percent. Same building value, same tax rate, same multiplier, and the commercial owner's taxable base is two and a half times larger.
That ratio is not arbitrary. The Illinois Constitution lets large counties classify property, but it caps the gap: the assessment level of the highest class may not exceed two and one-half times the level of the lowest class. Commercial property in Cook County sits at that ceiling.
The consequence for a reassessment is direct. The same increase in market value produces two and a half times the tax increase on a commercial building as on an apartment building. The table uses one hypothetical value change to show it.
| Step | Commercial, 25% level | Apartments, 10% level |
|---|---|---|
| Assessed value, before and after | $1,500,000 to $2,000,000 | $600,000 to $800,000 |
| Equalized value, before and after | $4,553,250 to $6,071,000 | $1,821,300 to $2,428,400 |
| Annual tax, before | $273,195 | $109,278 |
| Annual tax, after | $364,260 | $145,704 |
| Annual tax increase | $91,065 | $36,426 |
| Effective tax as a share of market value | About 4.55% | About 1.82% |
One caution on mixed-use buildings, which are common in Chicago's neighborhoods. A storefront with apartments above can be classed as residential, as commercial, or split between the two depending on its size and use. Look up the class on your parcel before you model anything, because the difference between the two columns above is the difference between a tax you can absorb and one you cannot.
What a $91,065 tax increase does to a refinance
Here is the part that surprises owners. Take the commercial building from the table, earning $500,000 of net operating income before the reassessment. A lender sizing a refinance at a 1.25 debt service coverage ratio, with an example rate of 6.50 percent on a 30-year amortization, looks at it twice.
| Item | Before reassessment | After reassessment |
|---|---|---|
| Market value | $6,000,000 | $8,000,000 |
| Net operating income | $500,000 | $408,935 |
| Maximum annual debt service at 1.25x | $400,000 | $327,148 |
| Maximum loan | $5,273,694 | $4,313,196 |
| Loan to value on $8,000,000 | 65.9% | 53.9% |
| Loan proceeds lost | $960,498, about 10.5 dollars of loan for every dollar of new annual tax | |
Read the loan-to-value line carefully. The building is worth $2,000,000 more, and the loan is smaller anyway, because the lender never reached its value limit. The coverage ratio bound first. That is the typical pattern on a Chicago commercial property after a reassessment: the higher value helps the appraisal, and the higher tax that comes with it takes the proceeds back.
Run your own numbers in our free loan calculator, and see our guide to commercial mortgage rates for how the rate side of the same calculation moves.
The arrears trap in your trailing twelve months
Illinois property taxes are paid a year behind. The tax year 2024 bill, the first to reflect Chicago's 2024 reassessment, was paid in 2025, and it arrived in two parts.
The first installment is, by rule, 55 percent of the previous year's total tax. It knows nothing about the reassessment.
The second installment carries everything new: the reassessed value, the final tax rates and any exemptions. It is where the increase actually lands, and it lands all at once.
Now picture the refinance file. Your trailing twelve months of operating statements may include a first installment at the old level and no second installment yet, or a second installment from the year before. Your books show last year's tax. A careful lender does not use your books for this line. It pulls the current assessment, applies the multiplier and the latest rate, and underwrites the tax you are about to pay.
The gap between those two numbers is where Chicago refinances go wrong. The owner expects a loan sized on historical income. The lender sizes it on forward income. The difference shows up late, usually at the term sheet or the appraisal, when there is the least room to adjust.
Refinancing before or after the 2027 reassessment
Because the cycle is fixed, the timing is partly in your control. Chicago was reassessed in 2024 and is next reassessed in 2027. A 2027 reassessment reaches owners on the tax year 2027 second installment, paid in 2028.
Refinancing in 2026 or early 2027. The 2024 reassessment is already in the second installment, so your tax is known. That is an advantage: no surprise from the county during underwriting. The cost is that a lender may still stress the next reassessment, especially on a longer term loan.
Refinancing after the 2027 reassessment. You will know the new value and can appeal it first. If values in your area have softened, waiting could help. If they have risen, you will be refinancing into the higher tax with nothing left to negotiate.
There is no universal answer. What does not work is ignoring the date. If your current loan matures in 2027 or 2028, plan the refinance around the reassessment calendar, not around the maturity date alone.
Appeal before you apply
Cook County gives owners several chances to challenge a value, and each successful step lowers the tax that a lender will subtract.
The Assessor. After a reassessment notice, owners can appeal to the Assessor's Office within the posted window for their township.
The Board of Review. The Cook County Board of Review hears appeals independently of the Assessor, with its own filing period for each township. In Chicago's 2024 reassessment year the Board issued hundreds of thousands of decisions.
Beyond the county. Owners who are still dissatisfied can take the case to the state Property Tax Appeal Board or to the Circuit Court.
For a refinance, sequence matters. An appeal that is still pending gives a lender nothing to underwrite except the higher number. A decided appeal gives it a lower, documented tax. When the timing allows, file the appeal, get the decision, then apply. Using the ratio in the example above, every $10,000 of annual tax removed on appeal is worth roughly $105,000 of loan capacity at a 1.25x coverage ratio.
A plain word on expertise: property tax appeals in Cook County are a specialty. Commercial Mortgage Connection places loans; it does not file appeals. Use a Cook County property tax attorney or consultant for that part.
What a Chicago lender will actually underwrite
Expect four things on the tax side of a Chicago refinance file, whatever the loan type.
A forward tax line. The lender computes the tax from the current assessment, the current multiplier and the latest composite rate, and uses the higher of that figure and the actual bill.
A tax escrow. Most commercial lenders collect taxes monthly with your payment. Because Cook County taxes are large relative to income, the initial escrow deposit at closing can be substantial. Budget for it in your closing cash.
A stress on the next cycle. On a five to ten year loan, a lender may ask what happens at the next reassessment. A property with thin coverage after today's tax will struggle to answer that question.
Proof of payment. Delinquent taxes become a lien ahead of a mortgage. Expect the lender and title company to confirm that every installment is paid before closing.
The wider document list is covered in our guide on strengthening a commercial mortgage application.
Loan options when the tax bill jumps
If the new tax has pushed your coverage below what your current lender will accept, the lender type becomes the lever.
| Option | Why it helps after a tax increase | The trade-off |
|---|---|---|
| Bank or credit union | Relationship lenders may look at the whole borrower, not only this property's coverage. | Often shorter terms and recourse; appetite varies by bank. |
| Agency multifamily, Fannie Mae or Freddie Mac | Long amortization and fixed rates can raise supportable debt on apartments. | Apartments only. Strict on stabilized income, including the forward tax. |
| Portfolio lender | Can hold loans that do not fit a standard box, including thinner coverage with offsetting strengths. | Usually priced above agency and bank money. |
| Bridge loan | Buys time to finish an appeal or lease up before permanent financing. | Higher rate and fees, and a take-out that still has to work. |
| Cash-in refinance | Paying the loan down to what the new income supports keeps the property on permanent terms. | Requires cash, but often costs less than any of the alternatives. |
For how portfolio lenders approach loans outside the standard box, see our guide to portfolio lending. For a refinance that pulls equity out rather than paying debt down, our cash-out refinance guide walks through the mechanics, and our guide to the San Jose commercial mortgage shows how a different state's tax rules move the same numbers.
When refinancing now is the wrong move
Three situations call for waiting, and saying so is part of giving useful advice.
Your appeal is pending. If a decision is months away and your maturity is not, a short extension from your current lender can be worth more than refinancing into the higher tax today.
Your current loan is cheaper than the market. If your existing rate is well below today's and you are not being forced out, refinancing only to pull cash can cost more in interest than the cash is worth.
The building needs to earn its way up. If rents are below market and leases turn within a year, the income that supports a larger loan may be one leasing cycle away.
A plain disclosure belongs here. Commercial Mortgage Connection is a brokerage that is paid when loans close, which is exactly why this section tells you when not to borrow. If a bank has already turned the refinance down, see our guide on getting a commercial mortgage after a bank denial.
How CMC places a Chicago refinance
Commercial Mortgage Connection is a commercial mortgage brokerage headquartered in Yonkers, NY, working a network of 750+ lenders carrying 500K+ loan programs across all 50 states, with more than $1,000,000,000 originated. Every engagement is led personally by founder Michael McGovern, and a submitted file receives a loan review response within 4 hours.
To be clear about what that means in Chicago: CMC is a nationwide brokerage, not an Illinois bank, and it has no Chicago office. What it adds is the underwriting a lender will do, done first. Before a file goes anywhere, the tax line is rebuilt from the current assessment, multiplier and rate, so the loan amount you hear first is the one that survives underwriting. For foreign buyers of Chicago apartments, our guide to foreign national apartment loans covers that path.
Do you lend in Illinois?
Yes. Commercial Mortgage Connection is headquartered in Yonkers, NY and places loans through its 750+ lender network in all 50 states, including Illinois. The City of Chicago and suburban Cook County are inside that footprint, along with DuPage, Lake, Will and Kane counties.
Commercial lending is regulated federally and at the state level. Property tax, lien priority, closing practice and foreclosure rules vary by state, and Illinois differs from the Northeast on several of them. Confirm specifics with Illinois counsel and a Cook County tax professional before you sign a term sheet. Call 888-656-9812 to talk through a building.
Commercial refinance Chicago FAQ
How does a Cook County reassessment affect my commercial refinance in Chicago?
A higher assessed value raises your property tax, the tax reduces net operating income, and a lender sizes a refinance on that income. At a 1.25 debt service coverage ratio and an example rate of 6.50 percent on a 30-year amortization, each dollar of new annual tax removes roughly ten and a half dollars of loan capacity. In the example on this page, a $91,065 tax increase reduced the maximum loan by about $960,000, even though the building's market value rose.
Why is commercial property taxed more heavily than apartments in Cook County?
Cook County's classification ordinance assesses commercial property at 25 percent of market value and most residential property, including apartment buildings, at 10 percent. The Illinois Constitution allows large counties to classify property but caps the highest class at two and one-half times the lowest, so commercial property sits at the maximum allowed gap. The same market value increase therefore produces two and a half times the tax increase on a commercial building.
When is Chicago next reassessed?
Cook County reassesses on a three-year rotation. The City of Chicago was reassessed in 2024 and is next scheduled for 2027. Because Illinois property taxes are paid in arrears, a 2027 reassessment shows up on the tax year 2027 second installment bill, paid in 2028.
Why does my lender use a different tax number than my operating statements?
Because Cook County taxes are paid a year behind and in two installments. The first installment is 55 percent of the previous year's total tax and does not reflect a reassessment; the second installment carries the new assessment and rates. Your trailing twelve months can therefore show the old tax while a lender underwrites the new one, computed from the current assessment, the equalization factor and the latest rate.
Should I appeal my assessment before I refinance?
Usually, if the timing allows. A decided appeal gives the lender a lower, documented tax to underwrite, while a pending appeal gives it only the higher number. Owners can appeal to the Cook County Assessor, then the Cook County Board of Review, and then to the state Property Tax Appeal Board or the Circuit Court. Use a Cook County property tax attorney or consultant for the appeal itself.
Sources
- Illinois Constitution, Article IX, Section 4, Real Property Taxation. Classification by counties over 200,000 people, with the highest class capped at two and one-half times the lowest. Checked 29 September 2026.
- Cook County Code of Ordinances, Section 74-64, Classification of real property for assessment purposes. Assessment levels by property class. Checked 29 September 2026.
- The Civic Federation, The Cook County Property Assessment Process. Background on classification, the 10 percent and 25 percent levels adopted for tax year 2009, and equalization. Checked 29 September 2026.
- Franczek P.C., Illinois Department of Revenue Releases Final 2024 Cook County Equalization Factor. Final 2024 factor of 3.0355 and the historical factors since 2009. Checked 29 September 2026.
- Cook County Clerk, Tax Extension and Rates. How composite tax rates are calculated from district levies and equalized assessed value. Checked 29 September 2026.
- Cook County Treasurer, Tax Year 2024 First Installment bills. The first installment as 55 percent of the previous year's total tax, with exemptions applied to the second installment. Checked 29 September 2026.
- Cook County Board of Review. Assessment appeals by township and filing periods. Checked 29 September 2026.
- Censum, Chicago 2027 Reassessment Prep. Chicago's 2024 reassessment, the Board of Review decision volume, and 2027 as the next city reassessment. Checked 29 September 2026.
- Federal Reserve Board, Senior Loan Officer Opinion Survey on Bank Lending Practices, July 2026. Reported bank standards and demand for commercial real estate loans. Checked 29 September 2026.
Michael McGovernFounder, Commercial Mortgage Connection. Michael wrote and reviewed this guide drawing on a career that began at Bear Stearns & Co. in 1997, ran through structuring billions of dollars in CMBS and MBS in the F.A.S.T. group at Bear, and selling mortgage product at Lehman Brothers, and now spans more than $1 billion in originated mortgages.
Refinancing in Chicago? Send the tax bill, the rent roll and the maturity date.
Senior-led review of your operating statements with the tax line rebuilt from the current assessment, multiplier and rate, the 2027 reassessment worked into the timing, the loan options priced side by side, and a loan review response within 4 hours. Call 888-656-9812, live operator 24/7.
Facts on this page were verified against the cited Illinois Constitution, Cook County ordinance, Cook County Clerk, Cook County Treasurer, Cook County Board of Review, Civic Federation, Franczek P.C., Censum and Federal Reserve sources on 29 September 2026. Every tax rate, loan amount, ratio and dollar figure above is an illustrative example, not an offer, a quote, or a commitment to lend. Assessment levels, equalization factors, tax rates and lender appetite change.
Nothing on this page is a loan offer, a rate quote, legal, tax or accounting advice, or personalized financial advice. Property tax appeals require a qualified Cook County property tax professional, and all financing is subject to lender approval, credit review and property underwriting, with no approval guaranteed. Broker licensing and closing rules vary by state. Commercial Mortgage Connection is a commercial mortgage brokerage headquartered in Yonkers, NY, is not an Illinois bank, has no Chicago office, does not file property tax appeals, is paid when loans close, and sells the service described on this page. Equal Housing Opportunity.
