Illinois business tax rates can have a significant impact on your company’s finances, making it an important component to understand. As a small business owner, the amount you pay will depend on factors such as your business structure, revenue, and whether you have employees. Whether you handle your finances internally or utilize outside business accounting and bookkeeping support, knowing what to expect can ensure you’re prepared for tax season. Here, we’ll go over key business tax rates in the state of Illinois.
Quick Overview: Illinois Business Tax Rates
✓ Illinois businesses may owe several different taxes, including corporate income tax, Personal Property Replacement Tax (PPRT), sales tax, payroll taxes, and unemployment insurance taxes, depending on their structure and operations.
✓ Business structure plays a major role in tax liability. C corporations pay a 7% corporate income tax plus a 2.5% PPRT, while LLCs, partnerships, and S corporations are generally subject to pass-through taxation and a 1.5% PPRT.
✓ Businesses that sell taxable goods or services must collect and remit sales tax. Illinois has a statewide sales tax rate of 6.25%, though local taxes can increase the total rate in some areas.
✓ Employers have additional tax responsibilities, including withholding Illinois income tax from employee wages and paying unemployment insurance taxes, both of which generally require quarterly filings.
✓ Illinois offers several tax credits and incentives that may help reduce a company’s tax burden, including the EDGE Tax Credit, High Impact Business Program, Apprenticeship Education Expense Credit, and Angel Investment Credit Program.
Business Taxes in Illinois at a Glance
| Tax Type | Rate | Who Pays It? |
| Business or Corporate Income Tax | 7.0% | C corporations doing business in Illinois |
| Personal Property Replacement Tax (PPRT) | 2.5% for C corporations; 1.5% for partnerships, LLCs, and S corporations | Most businesses, except sole proprietorships |
| Sales Tax | 6.25% state rate (local taxes may increase the total rate) | Businesses that sell taxable goods and certain services |
| Withholding Tax | Flat rate of 4.95% (withheld from employee wages) | Employers with Illinois employees |
| Unemployment Insurance Tax | Varies by employer (new employers generally pay a standard rate) | Employers with covered employees |
| Pass-Through Entity Tax (PTE) | 4.95% (optional election) | Eligible partnerships and S corporations that elect to pay the tax at the entity level |
What Taxes Do Businesses Pay in Illinois?
Every business has certain tax liabilities, and small business owners in Illinois need to be aware of what they’re responsible for to avoid issues down the road. Some of the most important obligations to know for the upcoming tax year include the following:
State Business Income Taxes
Illinois businesses may be subject to state income taxes, although the exact tax treatment depends on the business structure. C corporations pay Illinois corporate income tax, while income from sole proprietorships, partnerships, LLCs, and S corporations generally passes through to the owners’ individual income tax returns. Certain entities may also be subject to the state’s Personal Property Replacement Tax (PPRT). The state corporate income tax rate is 7% for C corporations and LLCs with C corp elections.
Personal Property Replacement Tax
Personal property replacement tax (PPRT) is a tax imposed by Illinois on certain businesses and pass-through entities, created to replace revenue that local governments lost when Illinois eliminated taxes on personal property. C corporations pay a 2.5% replacement tax, while partnerships, LLCs taxed as partnerships, and S corporations generally pay a 1.5% replacement tax. This tax is separate from Illinois income tax and can increase a business’s overall tax liability. For example, a C corporation pays both the 7% Illinois corporate income tax and the 2.5% PPRT, resulting in a combined effective state tax rate of 9.5%.
Sales and Use Taxes
Businesses that sell taxable goods and certain taxable services must also collect and remit Illinois sales tax. As of January 1, 2026, the statewide sales tax rate is 6.25%, but local jurisdictions can impose additional taxes, resulting in higher rates up to 11% in certain areas. Businesses that purchase taxable items without paying sales tax may also owe use tax.
Employment-Related Taxes
Other tax payments that businesses are typically responsible for include those involving payroll and employment. In addition to federal income taxes, employers must withhold Illinois income tax from employee wages and remit those funds to the state. These payments need to be filed quarterly, not all at once when the tax year ends. Illinois state withholding tax is currently set at 4.95%
Taxes small businesses in Illinois may also be required to pay unemployment insurance taxes, which help fund benefits for eligible workers who lose their jobs. The current tax rate varies based on the business, but if applicable, it needs to be filed quarterly.
Illinois Pass-Through Entity Tax (PTE Tax)
The Illinois pass-through entity (PTE) Tax is an optional tax election available to partnerships and S corporations. It was introduced in response to the federal cap on state and local tax (SALT) deductions, and allows eligible businesses to pay Illinois income tax at the entity level rather than passing the entire tax obligation through to individual owners and their personal income tax returns.
The current PTE tax is imposed at a rate of 4.95% of the taxpayer’s net income for the taxable year. When a business elects to pay the PTE tax, owners may be able to claim a credit on their Illinois individual tax returns for their share of the tax paid by the entity.
Industry-Specific Taxes
Some businesses may be subject to additional taxes depending on the products or services they provide. For example, businesses involved in fuel sales, tobacco products, alcohol distribution, or certain regulated industries may have additional state tax obligations beyond standard business taxes.
Illinois Business Tax Rates by Business Structure
How your business is structured will impact the different types of taxes you need to pay and other fiscal requirements, as summarized below.
| Business Structure | How It’s Taxed in Illinois | Additional Illinois Taxes | Best For |
| Sole Proprietorship | Business income is reported on the owner’s personal tax return. | Sales tax and employer taxes may apply. | Freelancers and single-owner businesses. |
| LLC | Income typically passes through to the owners’ personal tax returns. | May owe a 1.5% Personal Property Replacement Tax (PPRT), plus sales and employer taxes. | Small businesses looking for liability protection and flexibility. |
| Partnership | Income passes through to the partners’ personal tax returns. | Subject to a 1.5% PPRT, plus other applicable business taxes. | Businesses with two or more owners. |
| S Corporation | Income passes through to shareholders instead of being taxed at the corporate level. | Subject to a 1.5% PPRT and employer taxes if the business has employees. | Businesses seeking pass-through taxation and potential tax savings. |
| C Corporation | Pays a 7% Illinois corporate income tax on profits. | Also pays a 2.5% PPRT, for a combined effective rate of 9.5%. | Larger businesses and companies seeking investors. |
Illinois Tax Credits and Incentives
There are also several different tax credits and incentives that can help business owners reduce their overall tax burden in any given year. Some of the most notable include the following:
- Economic Development for a Growing Economy (EDGE) Tax Credit: Available to businesses that create or retain jobs in Illinois and make significant capital investments.
- High Impact Business (HIB) Program: Offers tax incentives to businesses making substantial investments in Illinois facilities, equipment, or workforce expansion.
- River Edge Redevelopment Zone Credits: Incentives for businesses investing in designated redevelopment areas to encourage economic growth and revitalization.
- Apprenticeship Education Expense Credit: Available to employers who hire and train qualified apprentices through approved apprenticeship programs.
- Work Opportunity Tax Credit (WOTC): A federal tax credit that may also benefit Illinois employers who hire individuals from certain targeted groups facing barriers to employment.
- Angel Investment Credit Program: Designed to encourage investment in qualifying startup and early-stage companies by offering credits to eligible investors.
Illinois Small Business Tax Filing Requirements
In addition to understanding Illinois business tax rates, small business owners must stay on top of their filing and reporting obligations throughout the year. The specific forms and deadlines will vary based on your business structure and tax responsibilities. Still, most businesses must register with the Illinois Department of Revenue, file the appropriate state tax returns, and make any required tax payments on time.
Whether you’re launching a new business or looking for help managing an established company, working with experienced tax professionals can help you stay compliant while identifying opportunities to reduce your tax liability. Del Real Tax Group provides business accounting and bookkeeping, tax planning, tax preparation, and outsourced accounting services to help Illinois business owners navigate complex tax requirements with confidence. Contact us today to learn more about how we can support your business’s financial success.
