Do I need to collect sales tax when selling in Illinois?

Illinois has one of the more complex sales tax systems in the country, combining a 6.25% state Retailers’ Occupation Tax (ROT) with local taxes that vary by location. If you sell taxable goods or services in Illinois, you may be required to collect and remit sales tax. This guide explains who must register, what’s taxable, current tax rates, and filing requirements.

Illinois Tax at a Glance (2026)

Topic	Key Information
State sales tax (ROT)	6.25%
Local sales taxes	Vary by location
Economic nexus	$100,000 in sales OR 200 transactions
Sales tax permit required	Yes
Filing frequency	Monthly, quarterly, or annually
Registration	MyTax Illinois

Determining Your Sales Tax Nexus in Illinois

Before you collect a single penny of tax, you need to establish whether you have nexus in Illinois. Nexus is the legal connection between your business and the state that triggers a tax obligation. Without it, Illinois can’t require you to collect or remit sales tax. But the definition of nexus has expanded significantly over the past several years, and many sellers who assume they’re exempt are actually on the hook.

When Do You Have Sales Tax Nexus in Illinois?

You generally have nexus if your business:

• Has a storefront, office, warehouse, employees, or inventory in Illinois
• Exceeds $100,000 in sales or 200 transactions with Illinois customers
• Creates affiliate or click-through nexus through qualifying Illinois-based partners

If you meet any of these conditions, you’ll generally need to register and collect Illinois sales tax.

Illinois Sales Tax vs. Use Tax Requirements

Illinois splits its sales tax system into two distinct but related obligations, and confusing them is a common mistake that trips up business owners.

Understanding Illinois Sales Tax (ROT)

Unlike many states, Illinois imposes a Retailers’ Occupation Tax (ROT) on sellers rather than a traditional sales tax on buyers. Businesses generally pass this cost on to customers by collecting it at checkout.

Since 2021, remote sellers and marketplace facilitators that meet Illinois nexus thresholds must collect the full combined state and local tax rate based on the delivery destination.

What Is Taxable in Illinois?

Most tangible personal property sold in Illinois is taxable, including:

Taxable products include:

• Clothing
• Electronics
• Furniture
• Household goods

Common exemptions include:

• Sales for resale
• Certain manufacturing equipment
• Qualifying nonprofit and government purchases

Most professional services aren’t subject to ROT, although some services may be taxed under separate rules.

Registration and Permit Procedures

Once you’ve determined that you need to collect sales tax in Illinois, registration is mandatory before you make your first taxable sale.

Applying for a Certificate of Registration

You’ll register through the Illinois Department of Revenue’s MyTax Illinois portal. Here’s the process:

1. Register through MyTax Illinois.
2. Provide your business information.
3. Receive your Certificate of Registration.
4. Begin collecting sales tax.

Processing typically takes a few business days. 

Pro tip: Open a separate bank account or sub-account specifically for sales tax funds. Commingling sales tax with operating revenue is one of the fastest ways to fall behind on payments, because you end up spending money that was never yours.

Calculating and Collecting the Correct Rates

Getting the rate right is where Illinois sales tax compliance gets genuinely difficult. The state has over 6,000 local taxing jurisdictions, and rates change regularly.

Illinois Sales Tax Rates

Illinois has a 6.25% state tax, plus local taxes that vary by city, county, and special district. Combined rates generally range from 7% to over 10% depending on where the customer receives the product.

Destination-Based Sourcing

Illinois generally uses destination-based sourcing for shipped orders, meaning the tax rate depends on the delivery location. In-store purchases use the rate where the sale occurs.

Filing Returns and Remitting Payments

Collecting the tax is only half the job. You also need to file returns and send the money to Illinois on time.

Filing Frequencies and Due Dates

Illinois assigns filing frequency based on your average monthly tax liability:

Filing Frequency	Monthly Tax Liability	Due Date
Monthly	$200 or more	20th of the following month
Quarterly	$50–$200	20th after each quarter
Annual	Under $50	January 20

All returns are filed through MyTax Illinois. Even if you had zero taxable sales in a period, you must still file a return. Skipping a filing because you had no sales is a common mistake that triggers penalties and compliance flags.

Set calendar reminders at least a week before each due date. Waiting until the last day invites problems, especially if the portal experiences technical issues near deadlines.

Penalties for Late Filing or Non-Compliance

Late filings may result in penalties, interest, and additional enforcement actions. Businesses that intentionally fail to collect or remit sales tax may face significant civil or criminal penalties.

Illinois Sales Tax Compliance Checklist

• Determine whether you have nexus.
• Register through MyTax Illinois.
• Collect the correct state and local tax rates.
• Keep exemption certificates on file.
• File returns on time.
• Maintain accurate sales records.

FAQs

Final Thoughts

Understanding Illinois sales tax starts with determining whether you have nexus, registering when required, collecting the correct tax rate, and filing returns on time. Following these steps can help you avoid penalties and keep your business compliant.

Need help with Illinois sales tax registration, filings, or compliance? Contact our tax professionals today.