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Illinois

Illinois payroll taxes: Your 2026 guide to staying compliant

By QuickBooks
Published on February 9, 2026

Illinois is one of the most economically diverse states in the U.S., boasting the fifth-largest economy and a Real Gross Domestic Product (GDP) exceeding $895 billion in 2024. Key industries in Illinois include finance, real estate, manufacturing, and agriculture, with the state ranking among the top three in crop exports. Illinois is also a growing hub for clean energy and tech innovation. As of 2024, there are over 1.3 million small businesses, which comprise roughly 99.6% of all companies within the state. With that thriving business climate comes a complex set of payroll tax requirements that employers must navigate to stay compliant and avoid penalties.

Let’s explore key details of Illinois payroll taxes, the legal risks of non-compliance, and how to set your business up for payroll success.

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What are payroll taxes?

Payroll taxes are taxes based on wages, salaries, or other compensation that both employers and employees must pay. While income taxes are also withheld through payroll, payroll taxes specifically fund programs like Social Security, Medicare, and unemployment insurance.

Understanding Illinois state payroll taxes

When starting a business in Illinois, you’ll need to understand both federal and state payroll taxes. 

Federal payroll taxes

Payroll taxes are mandatory and encompass both federal and state requirements. 

Federal payroll taxes include:

  • Federal income tax: This is withheld from each employee's paycheck based on their W-4 form and the current IRS tax brackets. You'll be responsible for calculating the correct amount, withholding it, and then sending it to the IRS.
  • Social Security and Medicare taxes: Both of these taxes have a portion paid by the employee and a matching portion paid by you, the employer. For Social Security, the combined rate is 12.4% on the first $176,100 of wages in 2025. For Medicare, it's 2.9% on all wages, with an extra 0.9% for higher earners. You'll withhold the employee's portion and match it.
  • Federal Unemployment Tax (FUTA): This is paid solely by you at a rate of 6% on the first $7,000 of each employee's wages. However, most employers get a 5.4% credit, reducing the rate to 0.6%. The graphic below lists some best practices for managing your FUTA obligations.
Futa best practices for small businesses

Illinois state payroll taxes

In addition to federal payroll taxes, Illinois employers must also account for state-specific payroll taxes.

  • Illinois State Income Tax (SIT): This tax is similar to federal income tax, but it goes directly to the Illinois Department of Revenue (IDOR) rather than the IRS. Also referred to as Illinois Personal Income Tax (PIT), the state income tax rate is a flat 4.95% on all employee wages. As an employer, you'll withhold this tax from employee compensation and remit it to IDOR.
  • State Unemployment Insurance (SUI): The state's unemployment insurance tax is paid solely by employers to the Illinois Department of Employment Security. New employers must pay an SUI contribution rate of 3.65% during the first few years of business (3.75% if part of a North American Industrial Classification System sector). Meanwhile, experienced employers will pay an SUI tax rate between 0.75% to 7.85% in 2025. The SUI tax applies to the first $13,916 of an employee's annual wages.

Illinois local payroll taxes

Illinois does not have local payroll wage or income taxes, but some Illinois municipalities—such as Chicago—may impose certain local employer-related taxes. These are in addition to federal and state taxes and can vary depending on where your business operates and where employees perform their work. They do not affect wage withholding and are not considered payroll taxes. Here are ways to determine whether your business is liable:

  1. Check with your local government to find out if your business is subject to any local employer-related taxes. Your city or county government directly can provide the most up-to-date information on applicable rates and regulations.
  2. Consult a tax professional if you're unsure about tax obligations. An accountant specializing in Illinois payroll taxes can help you identify any local taxes that apply to your business and ensure you remain fully compliant.

Other important tax considerations

Multiple locations

If your business has employees working in multiple cities or counties, you may be subject to different local taxes and compliance responsibilities for each location.

Changing rates

Applicable state payroll tax rates are subject to change over time. For example, an employer's Illinois SUI tax rate can change annually. The Illinois Department of Employment Security (IDES) reassesses and assigns rates to employers annually based on years in business and state experience factors. It's vital to stay informed about any updates that may impact your business and tax liabilities.

Employer responsibilities for payroll taxes in Illinois

As an Illinois employer, you're responsible for managing a complex array of federal and state payroll taxes, which involves careful calculation, timely withholding, and accurate reporting to various government agencies. Here's an overview of what you should know.

Registering for payroll taxes

The state of Illinois requires that employers register for payroll taxes before commencing business operations and paying employees. Registration is a vital step in the process, making it easier to manage obligations like income tax withholding and Illinois SUI contributions. There are two separate agencies that you must register with to cover the two Illinois state payroll taxes.

  • Register with the Illinois Department of Revenue (IDOR): Start by registering your business with IDOR. The easiest way to do this is through MyTax Illinois, the state's central hub for managing individual and business taxes. There, you can easily register by filing the applicable forms electronically. Alternatively, employers can complete Form REG-1 (Illinois Business Registration Application) manually and submit it to IDOR.
  • Register with the Illinois Department of Employment Security (IDES): After registering the business with IDOR, employers must register with IDES to determine their Illinois SUI tax rates. The state requires employers to register with IDES within 30 days after payroll starts. You can register electronically through MyTax Illinois or submit Form REG-UI-1 (Report to Determine Liability Under the Unemployment Insurance Act).

Calculating payroll taxes

Accurately calculating payroll taxes is essential to avoid penalties. You have a few options for determining how much to withhold and pay in payroll taxes:

  • Check government websites: After registering with IDOR and IDES, you can log in to your MyTax Illinois account to see applicable rates. You'll see your current SUI tax rate and taxable wage base, allowing you to perform calculations using information unique to your business. The official MyTax Illinois site is also where you report new hires, changes to your business structure, etc.
  • Payroll software: Some small business software payroll programs have a built-in Illinois payroll tax calculator and tax tables that can automate calculations, saving you time and minimizing the chance for errors.
  • Professional services: If you prefer to outsource payroll, a professional payroll service can handle everything for you.

Whichever method you choose, make sure you stay updated on the current tax rates and wage limits, as these can change every year.

Withholding state payroll taxes

Once you've calculated the correct amounts, you'll need to withhold these taxes from your employees' wages and remit them to the appropriate authorities. Follow Illinois guidelines for withholding and remittance timelines to avoid penalties.

Illinois State Income Tax: In Illinois, there's a flat rate of 4.95% for all employee wages, regardless of how much an individual earns. However, employers must consider exemptions based on the allowances listed on Form IL-W-4. Employers should use the 2025 Booklet IL-700-T Illinois Withholding Tax Tables to determine correct withholding amounts in consideration of exemptions.

  • Example: For employers with no allowances, the standard tax rate is 4.95%. Therefore, for a single employee making $2,500 for the pay period, you'd withhold roughly $123.75.

Illinois State Unemployment Insurance Tax: As an employer, you do not withhold any Illinois SUI taxes from your employees' paychecks. This payroll tax is one that you must cover entirely and remit to the IDES. 

The Illinois SUI tax rate varies based on the age of your business and other experience factors. For established employers, the rate for 2025 is between 0.750% to 7.850%. It's important to log in to your MyTax account to understand the unique rate assigned to your business for 2025. With that information in hand, you can determine how much to remit. The SUI applies only to the first $13,916 of an employee's annual wages. 

  • Example: Let's say that you're a new employer assigned an SUI tax rate of 3.650% for 2025. During the first quarter, you pay an employee $12,000. As an employer, you'd have to pay $438 to the IDES to cover your SUI tax rate obligations. In the second quarter, if your employee makes the same $12,000, you'd only have to pay roughly $70. Why? That employee's wages surpassed the $13,916 wage base, so you'd only be liable for the first $1,916 earned during that second quarter.

By applying these calculations to each paycheck, you ensure accurate withholdings and compliance with state requirements.

Remitting state payroll taxes

The next step is to submit withheld Illinois payroll taxes and SUI tax payments. In Illinois, employers can remit state income taxes electronically on the MyTax Illinois platform or by submitting Form IL-501 (Illinois Department of Revenue Payment Coupon). Tax withholding is due either monthly or semi-weekly, as determined by IDOR.

In addition to state income taxes, Illinois employers must also pay unemployment insurance taxes. These payroll taxes are due quarterly, and you can also pay them through MyTax Illinois. 

Businesses are encouraged to pay electronically and in many cases it is mandatory. For example, semi-weekly remitters must pay state income tax electronically.

Filing payroll tax returns in Illinois

As an Illinois employer, you must comply with quarterly and annual payroll tax return requirements to meet state and federal obligations. For 2025, Illinois just has quarterly payroll requirements:

Quarterly requirements

Penalties for late filing or non-compliance and tips for staying organized

Failing to file and pay Illinois state payroll taxes on time can result in penalties and interest. 

State income tax (Form IL-941)

  • Filing late: If you submit your Form IL-941 late, you can be charged a penalty—usually $250 or 2% of the tax due, whichever is less. This can escalate up to $5,000 for continued noncompliance. Even if you owe no tax, you can still get this penalty for filing late.
  • Paying late: If you pay your income tax late, the state charges 2% of what you owe if you’re up to 30 days late. If you’re more than a month late, the penalty jumps to 10% of what you owe.
  • Interest: You’ll also owe daily interest on any unpaid tax until you pay it off. The state sets the interest rate a couple of times each year.

State unemployment tax

  • Filing late: If you file your unemployment tax report (UI-3/40) late, the penalty depends on your total payroll for the quarter, not the number of employees. It starts at $50 and increases with your total wages.
  • Paying late: If you pay your state unemployment tax late, you’ll be charged 2% interest for each month (or part of a month) it’s late.
  • Quarterly reports always required: Even if you didn’t owe anything or everyone on your staff has reached the wage cap, you still have to file your report every quarter.

Filing and paying payroll taxes is crucial. Try these tips to help you stay organized and cover your tax obligations on time, every time.

  1. Set reminders. Mark all payroll tax deadlines on your calendar, set reminders on your phone or computer, and use task management or payroll software tools to stay on top of due dates.
  2. Use MyTax Illinois. The state’s official tax platform is quick, easy to use, and secure. Use it to file electronically and avoid delays associated with paper filing.
  3. Consider payroll software. Invest in reliable payroll software that automatically calculates taxes and reminds you of upcoming deadlines. With an Illinois payroll tax calculator, you’ll minimize the risk of errors and avoid missed payments.
  4. Outsource payroll. If managing payroll seems too challenging, consider outsourcing to a reputable payroll service provider. They will handle all tax calculations, filings, and payments on your behalf, ensuring compliance.
  5. Seek professional help. If you have any questions or concerns about payroll taxes, don't hesitate to consult with a tax professional or accountant. They can provide expert guidance and help you tackle the complexities of payroll tax compliance.
Pre-tax vs post-tax payroll deductions

Payroll tax credits and incentives

While payroll taxes are a necessary part of doing business, Illinois offers several tax credits and incentives that can reduce your overall tax liability, especially if you’re hiring and expanding your workforce. These programs incentivize employers like you to create jobs and support specific communities. Here are some credits and incentives your business may be eligible to receive:

Economic Development for a Growing Economy (EDGE) Tax Credit

This credit rewards businesses that create new jobs in the state of Illinois. Businesses that qualify for the EDGE tax credit may receive income tax credits equal to 50% to 100% of employee income tax withholding.

River Edge Redevelopment Zone Credits

Small businesses in designated zones adjacent to rivers in Illinois may qualify for River Edge Redevelopment Zone Credits, which reward $500 per eligible employee hired from the area.

High Impact Business (HIB) Program

The HIB program helps large-scale employers create and retain a higher-than-average number of jobs in the state, particularly in key industries. Benefits can vary, but qualifying employers may be eligible for payroll tax credits.

Work Opportunity Tax Credit (WOTC)

The federal WOTC can help you reduce your federal tax liability as an employer by as much as $9,600 for each employee you hire who's part of a targeted group. The purpose of this tax credit is to encourage employers to hire individuals who face barriers to gainful employment.

Federal Research and Development (R&D) Payroll Tax Credit

Eligible startups and small businesses can apply up to $500,000 per year of the federal R&D tax credit toward their employer portion of Social Security payroll taxes. This offset supports continued investment in research and innovation during early growth stages.

Federal Unemployment Tax Act (FUTA) Credit

Employers who pay their state unemployment insurance (SUI) taxes on time and in full may receive a FUTA credit of up to 5.4%, reducing the effective federal FUTA rate from 6.0% to 0.6% on the first $7,000 of wages per employee.

Industries frequently benefiting from Illinois business tax credits

  • Construction and Real Estate Development: Businesses that aim to redevelop land can benefit from the River Edge and Enterprise Redevelopment Zone programs. These programs aim to stimulate economic development in areas that face environmental challenges.
  • Manufacturing: Advanced manufacturing is a key industry in Illinois, and the state continues to incentivize businesses to move into the area. The High Impact Business program, in particular, can provide payroll tax credits in large-scale development projects that create a minimum of 500 jobs.
  • Agriculture: Agriculture a key economic mainstay for Illinois, but advancements in next-generation agriculture, agricultural technology, and food processing are the way of the future. Employers can benefit from the HIB program incentives and the WOTC to expand their workforce, create jobs, and contribute to the state's economic growth.
  • Manufacturing, Warehousing, & Distribution: The EDGE tax credit is available to businesses in the agricultural and industrial sectors. To qualify, employers must create a minimum of 50 full-time jobs. Even greater rewards are available to companies that make significant capital investments, hire from underserved areas, or expand their workforce to create more jobs in Illinois.

Consult with a tax professional to understand what tax credits and incentives you could potentially apply to your business. 

Common payroll tax mistakes in Illinois (and how to avoid them)

Even well-intentioned business owners can run into trouble with payroll taxes. In Illinois, even minor oversights can result in penalties, interest, and compliance headaches. Here are the most common mistakes and how to avoid them.

Misclassifying employees

Incorrectly classifying an employee as a contractor could lead to substantial fines and legal trouble. The Employee Classification Act provides guidance on how to correctly classify employees, providing guidelines to distinguish employees from contractors. Follow state law to ensure you're meeting your tax obligations.

Failing to properly register

Before you run payroll for the first time, you must register your business. As an employer, you need to register with the Illinois Department of Revenue and the Illinois Department of Employment Security. Failing to register with both entities could result in late filing penalties and interest.

Making incorrect withholding calculations

You must use accurate and current tax rates while considering exemptions and withholding allowances. Collect all necessary paperwork and use the current withholding tables to ensure accuracy. You can also rely on payroll software and Illinois payroll tax calculators to avoid errors.

Using an incorrect Illinois SUI tax rate

The IDES reassesses unemployment tax rates for employers on an annual basis. Log in to your MyTax Illinois account at the start of the year to understand your current rate.

Missing filing and payment deadlines

Illinois has strict deadlines for income tax returns and SUI tax reporting. Set reminders and submit all paperwork and payment well in advance of the due date to avoid any issues.

Poor recordkeeping

Maintain payroll records for several years. You may need them for annual reconciliations. Utilize digital storage systems to safeguard your documents.

Ignoring reporting requirements

One common mistake is not filing Illinois SUI quarterly tax reports throughout the year. Many employers assume they don't need to file these reports once employees surpass the annual wage base, but that's not the case. Failing to file reports, even when no taxes are due, will still result in penalties.

Tip: QuickBooks Payroll can help you avoid these common mistakes by automating calculations, tracking deadlines, and keeping accurate records.

How to manage your small business payroll obligations 

Understanding the nuances of Illinois' payroll taxes and regulations can take some time. Follow our small business tax preparation checklist and these steps to help you manage your payroll taxes.

Step 1. Partner with a tax professional

Consult a tax professional familiar with Illinois’ payroll taxes and regulations. They can guide you through compliance requirements, local tax nuances, and potential tax benefits for your business.

Step 2. Explore payroll software

Consider using payroll software to streamline your payroll processes. Tools like QuickBooks automate tax calculations, minimize errors, and ensure compliance with Illinois laws.

Step 3. Proactively plan for compliance

Stay informed about Illinois’ payroll tax deadlines and updates. Payroll software combined with expert guidance can help ensure you meet state and local requirements.

Step 4. Optimize your tax strategy

Work with your tax professional to uncover deductions, credits, or other incentives that could benefit your business. Leverage software reports to better understand your payroll data and identify opportunities for savings.

Step 5. Build a financially strong foundation

By combining expert guidance with the right tools, you can efficiently manage payroll taxes and focus on growing your business in the Prairie State.

What are the payroll taxes in Illinois?

Illinois payroll taxes consist of two key components: State Personal Income Tax (SIT) and State Unemployment Insurance (SUI). 

Calculating payroll taxes in Illinois

Payroll tax calculations in Illinois depend on several factors, including:

  • Employee’s wages and taxable income
  • Employer’s annual Illinois SUI tax rate
  • Federal taxes

For employees, the main payroll taxes are: 

  • State income tax
  • Federal income tax
  • FICA (Social Security and Medicare taxes)

For employers, the main payroll taxes are:

  • Illinois State Unemployment Insurance Tax
  • Federal Unemployment Tax (FUTA)

To better understand Illinois employer payroll taxes and your obligations, visit the official websites for the Illinois Department of Revenue and the Illinois Department of Employment Security. On those sites, you can easily register your business, file all required forms, view applicable tax rates, submit payments, and more. To make things easier and reduce errors, you can also consider using payroll software configured with Illinois-specific data or consulting a tax professional.

It’s essential to stay updated on the current rates and regulations, as they can change annually.

Leverage payroll software for compliance in Illinois

Managing payroll in Illinois requires accuracy due to complex regulations. Errors can lead to penalties and legal risks, but QuickBooks streamlines payroll management to ensure compliance. It automatically calculates, files, and pays federal and state payroll taxes—with a 100% accuracy guarantee.** You'll stay current with Illinois tax law changes, easily generate reports for filings, and get up to $25,000 in penalty coverage if issues arise.**



Disclaimer: 

**Accuracy Guaranteed: Available with QuickBooks Online Payroll Core, Premium, and Elite. We assume responsibility for federal and state payroll filings and payments directly from your account(s) based on the data you supply. As long as the information you provide us is correct and on time, and you have sufficient funds in your account, we’ll file your tax forms and payments accurately and on time or we’ll pay the resulting payroll tax penalties. Guarantee terms and conditions are subject to change at any time without notice.

Tax penalty protection: If you receive a tax notice and send it to us within 15 days of the tax notice we will cover the payroll tax penalty, up to $25,000. Additional conditions and restrictions apply. Only QuickBooks Online Payroll Elite users are eligible to receive tax penalty protection.

This content is for information purposes only and information provided should not be considered legal, accounting or tax advice or a substitute for obtaining such advice specific to your business. Additional information and exceptions may apply. Applicable laws may vary by state or locality. No assurance is given that the information is comprehensive in its coverage or that it is suitable in dealing with a customer’s particular situation. Intuit Inc. does not have any responsibility for updating or revising any information presented herein. Accordingly, the information provided should not be relied upon as a substitute for independent research. Intuit Inc. cannot warrant that the material contained herein will continue to be accurate, nor that it is completely free of errors when published. Readers should verify statements before relying on them.


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