If you do business in Illinois, sales tax compliance is not something you can afford to treat casually. Between state-level taxes, local add-ons, and special rules for certain products, Illinois sales tax can get complicated quickly, especially if you sell across multiple cities or counties.
Illinois operates as an origin-based state for sales tax purposes. This means the tax rate applied depends largely on where the sale is fulfilled. When local jurisdictions add their own rates into the mix, many businesses find compliance more complex than expected.
Whether you are opening your first storefront, selling online, or expanding into Illinois for the first time, understanding how Illinois sales tax works is essential to staying compliant and avoiding costly penalties. Let’s start with the basics.
What is Illinois sales tax
When people refer to “sales tax” in Illinois, they are referring to a combined rate that includes state, local, mass transit, home rule, and non-home rule occupation and use, park district, county public safety and facilities, county school facility, and business district taxes.
What is the Illinois sales tax rate?
Illinois has a statewide base sales tax rate of 6.25%, which applies to most retail sales of tangible personal property. However, this rate is only the foundation.
In Illinois, the total sales tax rate is made up of multiple layers. Counties may impose their own taxes, certain regions are subject to Regional Transportation Authority (RTA) taxes, and cities can add local municipal taxes. When combined, these layers determine the final rate charged to customers at checkout.
As a result, sales tax rates can vary significantly across the state and can exceed 10% in some areas
Illinois Sales Tax Components at a Glance
- State sales tax: 6.25%
- County sales taxes: Vary by county
- RTA tax: Applies in certain counties
- City and special district taxes: Vary by location
Example County Sales Tax Rates
Counties in Illinois may impose their own local sales tax, which is added on top of the state rate. Some counties are also subject to the RTA tax, which further increases the total rate.
| County | County Sales Tax Rate | Notes |
|---|---|---|
| Cook County | 1.75% | Includes RTA and other county-level taxes |
| DuPage County | 0.25% | Subject to RTA tax |
| Lake County | 1.50% | Subject to RTA tax |
Example City Sales Tax Rates
Cities and municipalities may impose additional local sales taxes. These city-level taxes are added on top of the state, county, and any applicable RTA taxes, which is why total rates can differ even within the same county.
- Chicago: ~10.25%
- Naperville: ~7.75%
- Oak Brook: ~7.50%
- Schaumburg: ~10.00%
Actual rates may vary by exact address or special taxing district. This means two customers purchasing the same item in different parts of the same city could pay different amounts of sales tax, even on the same day. Use the MyTax Illinois Rate Finder to search for the sales tax rate by location.
How to calculate sales tax in Illinois?
Calculating Illinois sales tax starts with identifying the correct combined tax rate for the location where the sale occurs. Because Illinois sales tax is made up of multiple state and local components, the total rate can vary by city, county, and special taxing district.
To calculate Illinois sales tax, follow these steps:
- Determine the location of the sale
Illinois is an origin-based sales tax state for most transactions. This means the applicable tax rate is generally based on the seller’s business location, not the buyer’s location. - Identify the combined sales tax rate
Start with the statewide base rate of 6.25%, then add any applicable local, county, and special district taxes for that location. - Apply the rate to the taxable sales amount
Multiply the total taxable sales price by the combined sales tax rate to calculate the tax due.
If a business located in an area with a 10.25% combined sales tax rate sells a taxable item for $100, the sales tax would be:
$100 × 0.1025 = $10.25 in sales tax
Total amount charged to the customer: $110.25
Use our reverse sales tax calculator
A reverse sales tax calculator is especially useful for businesses that want to display clean, whole-number prices on menus while still including sales tax in the final amount charged to customers. This is common for restaurants, cafés, and food service businesses that prefer simple, all-in pricing.
Instead of adding tax at checkout, a reverse sales tax calculator helps business owners work backward from the final, tax-inclusive price to determine the pre-tax amount that should be entered into their POS system.
Simply enter the desired final price, apply the correct Illinois sales tax rate, and the calculator will calculate the pre-tax amount to enter into your POS system.
What is subject to sales tax in Illinois?
In Illinois, sales tax generally applies to the retail sale of tangible personal property. Tangible personal property refers to physical items that can be seen, weighed, measured, felt, or touched.
If your business sells physical goods to customers in Illinois, those sales are likely subject to sales tax unless a specific exemption applies. Examples of items that are typically subject to sales tax in Illinois include:
- Clothing and footwear
- Furniture and home goods
- Electronics and appliances
- Prepared food and beverages
- Alcoholic beverages
- Office supplies and business equipment
Illinois also taxes certain leases and rentals of tangible personal property, as well as some service transactions when they involve the transfer of taxable property. Because Illinois sales tax rules can vary by product type and transaction structure, businesses should review taxability carefully and confirm requirements with the Illinois Department of Revenue.
What items are exempt from Illinois sales tax?
While many retail sales are subject to sales tax in Illinois, certain items and transactions are exempt or taxed at a reduced rate under Illinois law. These exemptions are designed to reduce the tax burden on essential goods and specific types of purchases. Sales tax exemptions in Illinois commonly include:
- Prescription medications
- Medical devices and durable medical equipment
- Newspapers and magazines
- Manufacturing and production machinery used primarily in the manufacturing process
- Sales to exempt organizations, such as qualifying nonprofit or government entities
- Sales for resale, when the buyer provides a valid resale certificate
Some items are not fully exempt but are taxed at a reduced rate rather than the standard retail rate. For example, many grocery items and medical appliances are subject to a lower state tax rate than other retail goods.
Illinois sales tax on food
Food and beverage sales in Illinois follow a different set of rules than most retail goods, and this is an area where businesses can get tripped up.
As of 2026, Illinois has eliminated the state-level 1% sales tax on groceries. However, the state has allowed local municipalities to impose their own 1% tax on food if they choose to do so. As a result, in many parts of Illinois, grocery food is still taxed at a reduced 1% rate due to local municipal taxes. In areas where a municipality chooses not to impose the 1% local tax, grocery food may be fully exempt from sales tax. Keep in mind that candy and soft drinks are not considered grocery food in Illinois and are therefore subject to the full 6.25% state sales tax rate, rather than the reduced 1% rate.
This means the taxability of grocery food can vary depending on where the sale occurs, even though the state portion of the tax has been removed. For many businesses, this change affects how sales tax is reported. Retailers impacted by this update may be required to use revised filing forms.
Illinois sales tax on restaurant food
When it comes to prepared foods, they do not qualify for the grocery food exemption or reduced rate. Sales of prepared food and beverages from places such as restaurants, cafés, coffee shops, pizzerias, food trucks, and even grocery stores are generally taxed at the full statewide sales tax rate, plus any applicable local taxes.
With layered tax rules, varying food tax treatment, and location-based rates, managing Illinois sales tax can quickly become complex, especially for restaurants and food service businesses.
DAVO by Avalara helps simplify sales tax compliance by automatically setting aside the sales tax you collect each day, then filing and paying it on your behalf when it is due. This helps ensure taxes are paid accurately and on time, without the stress of manual calculations, missed deadlines, or surprise penalties.
What is Illinois sales tax on services?
Illinois generally does not tax the sale of services. This means that when a business provides a service without transferring taxable tangible personal property, the transaction is typically not subject to Illinois sales tax.
However, Illinois does impose a Service Occupation Tax when tangible personal property is transferred to the customer as an incident to providing a service. This is where many businesses get confused.
Examples of Services That Are Generally Exempt
The following services are commonly not subject to Illinois sales tax, as long as no taxable tangible personal property is transferred:
- Professional services, such as legal, accounting, and consulting services
- Personal services, such as haircuts, barber services, and nail services
- Repair services where only labor is provided
- Landscaping or lawn care services that do not include the transfer of taxable goods
- Marketing, design, and advertising services
In these cases, the customer is paying for labor or expertise rather than for physical goods.
When the Service Occupation Tax Applies
If a service includes the transfer of tangible personal property to the customer, Illinois may impose Service Occupation Tax on the value of that property.
Example:
A repair technician charges a customer for labor and installs a replacement part as part of the service. While the labor itself is not taxable, the replacement part transferred to the customer may be subject to Service Occupation Tax.
Another common example is a printing service that provides design work and delivers printed materials to the customer. Even though design services are not taxable, the printed materials are tangible personal property and may trigger the Service Occupation Tax.
How to manage tax-exempt sales in Illinois?
In Illinois, tax-exempt organizations are issued a sales tax exemption number by the state, rather than using a traditional exemption certificate. To make a qualifying tax-exempt purchase, the organization must provide this exemption number to the merchant at the time of sale.
Businesses should verify the exemption number through the MyTax Illinois portal administered by the Illinois Department of Revenue and retain proper records of the transaction. Documentation requirements for exempt sales are outlined in the Illinois administrative code, 86 Ill. Adm. Code 130.2081, which detail how sellers must substantiate tax-exempt transactions.
Failure to properly verify or document an exemption can result in the seller being held liable for the uncollected tax. For more details on sales tax exemptions, visit the Illinois Department of Revenue website on General Information about Sales Tax Exemptions.
Sales tax holiday
Illinois does not currently offer a sales tax holiday. Instead of a temporary sales tax exemption period, Illinois focuses on providing relief through an education expense credit on state income tax returns. This credit allows eligible taxpayers to claim certain education-related expenses when filing their Illinois income tax return.
The education expense credit is applied at the income tax level, not at the point of sale. This means qualifying purchases are still subject to sales tax at the time of purchase, even if the taxpayer may later receive a credit when filing their return.
Because Illinois does not offer a sales tax holiday, businesses are required to continue collecting and remitting sales tax as usual throughout the year.
Make your sales tax less taxing with DAVO.
How to register for an Illinois sales tax license?
Businesses that are required to collect sales tax in Illinois must register with the state before making taxable sales. This registration allows you to legally collect and remit sales tax.
Businesses can register for an Illinois sales tax license in one of three ways through the Illinois Department of Revenue:
- Register electronically through MyTax Illinois
This is the fastest option. Online registrations are typically processed within one to two business days. - Mail a completed Form REG-1
Businesses may submit a paper registration by mailing Form REG-1. Processing time for mailed applications is generally six to eight weeks. - Visit an Illinois Department of Revenue office
Businesses may visit a local office for assistance in completing and submitting the registration form.
Depending on the nature of your business, you may also be required to complete additional registrations, such as applying for a liquor license or a tobacco products license.
During the registration process, you will be asked to provide information such as:
- Legal business name and any trade names
- Federal Employer Identification Number (FEIN) or Social Security number
- Business address and contact information
- Type of business activity and products sold
- Estimated monthly or annual sales
Businesses should register before making taxable sales in Illinois. Registering late can result in penalties, interest, and liability for uncollected tax. For more details, visit the Business Registration page on the Illinois Department of Revenue website.
How to file a sales tax in Illinois?
Illinois strongly encourages businesses to file sales tax returns electronically through MyTax Illinois, though electronic filing is not required for all businesses. However, some businesses may be mandated to file electronically based on their filing obligations or tax activity.
Businesses making retail sales of general merchandise, qualifying drugs and medical appliances, groceries, or prepaid wireless telecommunications service are required to file Form ST-1, the Illinois Sales and Use Tax Return. When filing your return, you will report:
- Gross sales
- Taxable sales
- Exempt sales
- Sales tax collected, broken out by state and local jurisdictions
Even if no tax is due for a reporting period, businesses are generally still required to file a zero return.
How often you will need to file will be assigned by the Illinois Department of Revenue. Most businesses will need to file monthly, but could file quarterly or annually. The frequency is based on factors such as sales volumes and tax liability.
How to pay Illinois sales tax?
After filing an Illinois sales tax return, businesses must submit payment for any tax due by the applicable deadline. Sales tax payments are made to the Illinois Department of Revenue, and the state offers several payment options. Businesses can pay Illinois sales tax using the following methods:
- Electronic payment through MyTax Illinois
Payments can be made directly from a checking or savings account using an electronic funds transfer. This is the most commonly used and recommended method. - ACH credit payment
Businesses may initiate an ACH credit payment through their financial institution using the state’s banking instructions. - Credit or debit card
Illinois allows sales tax payments by credit or debit card through an approved third-party payment processor. Convenience fees may apply. - Check or money order
Some businesses may pay by mailing a check or money order with the appropriate payment voucher. Processing times are longer, and mailed payments must be postmarked by the due date to be considered timely.
Paying sales tax on time is critical, but it is also one more thing for business owners to manage. DAVO helps remove that burden by automatically setting aside the sales tax you collect each day and paying it to the state when it is due. This ensures your Illinois sales tax is paid accurately and on time, so you do not have to worry about missed deadlines, manual payments, or surprise penalties.
When is Illinois sales tax due?
Illinois sales tax payments are due on the same date as the sales tax return filing deadline. The exact due date depends on the filing frequency assigned to your business by the Illinois Department of Revenue, which is based on your average monthly sales tax liability.
In general:
- Businesses with an average monthly liability greater than $200 may be required to file and pay monthly, with returns and payments due by the 20th day of the following month.
- Businesses with an average monthly liability between $50 and $200 may be required to file and pay quarterly, with returns and payments due by the 20th day of the month following the end of the quarter.
- Businesses with an average monthly liability under $50 may be eligible to file and pay annually, with returns and payments due by the 20th day of January following the end of the tax year.
If a due date falls on a weekend or state holiday, the deadline is generally extended to the next business day.
Filing frequency is not permanent. The Illinois Department of Revenue may notify businesses if their filing frequency changes due to increases or decreases in tax liability. Businesses should always follow the most recent filing instructions provided by the state.
Illinois retailers’ allowance
Illinois offers a retailer’s discount for businesses that file and pay sales tax on time. Eligible retailers may deduct 1.75% of the sales tax collected, capped at $1,000 per month, as compensation for timely filing and payment. This discount is allowed only when returns and payments are submitted by the due date and in accordance with rules set by the Illinois Department of Revenue.
For businesses with locations in other states, sales tax discounts can vary widely. Be sure to check our sales tax discount guide to see where additional savings may be available. With DAVO, this collection allowance is returned to the business in full, sometimes covering the full subscription cost to DAVO.
Illinois sales tax penalties and interest
Illinois may assess penalties and interest when sales tax returns are filed late, payments are made late, or filings contain errors. The penalties outlined below are common, but they are not the only penalties the Illinois Department of Revenue is authorized to assess under Illinois law.
Late-filing or non-filing penalty
A late-filing penalty may apply if:
- You do not file a return by the due date, including any extended due date, or
- You file a return on time, but it cannot be processed, and you fail to correct it within 30 days of being notified
Illinois uses a two-tier penalty structure for late or missing returns.
First-tier penalty
- The lesser of $250 or 2% of the tax required to be shown due on the return, reduced by timely payments or credits
- If a return is timely filed but cannot be processed, you have 30 days to correct it before this penalty applies
Second-tier penalty
- Applies if you do not file a return within 30 days after receiving a notice of nonfiling
- The additional penalty is the greater of $250 or 2% of the tax shown due, without regard to timely payments
- This additional penalty may not exceed $5,000
- The penalty may be assessed even if no tax is due
Late-payment penalty
A late-payment penalty applies if sales tax is not paid by the payment due date or the original return due date, regardless of extensions.
The penalty is based on how late the payment is:
- 1 to 30 days late: 2% of the unpaid tax
- 31 or more days late: 10% of the unpaid tax
Higher penalty rates may apply in certain situations:
- 15% penalty if tax is not paid until after the start of an audit or investigation
- 20% penalty if tax is not paid within 30 days after an audit-prepared amended return or waiver is issued
- The 20% penalty also applies if tax is paid under protest or followed by a claim for credit or refund
Interest accrues on unpaid Illinois sales tax from the original due date until the balance is paid in full. It is charged separately from penalties and continues to accrue regardless of filing status.
How DAVO can help with Illinois sales tax
From Chicago neighborhoods to suburban main streets, Illinois sales tax rules can feel like a moving target. Between local rate differences, food tax nuances, filing schedules, and penalties, staying compliant takes real time and attention. DAVO helps Illinois businesses take sales tax off their plate by automatically setting aside what you collect and filing and paying it on your behalf when it is due, on time every time, guaranteed. That means fewer late nights, fewer surprises from the state, and more time to focus on serving your customers and growing your business.
Choose your POS system to get started with DAVO.
Illinois Department of Revenue Information:
1-800-544-5304
Contact details: https://tax.illinois.gov/aboutidor/contactus.html
