Illinois Sales Tax Made Simple: A Business Owner’s Guide

Key Takeaways

Before diving into the full guide, here are the most important updates and foundational points for sales tax in Illinois:

• Illinois Sales Tax Structure: Illinois imposes a Retailers’ Occupation Tax (ROT) and a corresponding Use Tax, with both state and local components.
• Economic Nexus Update (Effective Jan. 1, 2026): The 200-transaction threshold has been eliminated. Remote sellers and marketplace facilitators now establish nexus solely by exceeding $100,000 in Illinois gross sales in a 12-month period.
• Destination-Based Sourcing: Sales are sourced to the customer’s delivery location, not the seller’s location. This applies to remote sellers and marketplace facilitators (2025) and expands further in 2026.
• 15% Undetermined Location Rate: If a seller fails to report proper destination data, Illinois may assess a 15% tax rate on those sales.
• Marketplace Facilitators: Platforms like Amazon, eBay, Etsy, and Walmart must collect and remit Illinois sales tax if they exceed the $100,000 threshold. Payment processors alone are not marketplace facilitators.
• Grocery Tax Change: The state’s 1% grocery tax ended January 1, 2026, though local governments may impose their own grocery taxes.

Do You Need to Collect and Remit Sales Tax in Illinois? 

First we need to answer this question: what is Illinois’ sales tax structure?

Illinois sales tax consists of:

• Retailers’ Occupation Tax (ROT): tax on retailers’ receipts from selling tangible personal property at retail in Illinois; and
• Use Tax: tax on purchasers when ROT was not charged.

Businesses that sell tangible personal property, provide taxable services, or engage in certain contracting activities must collect and remit ROT. Whether a business owes ROT depends on the nature of the transaction and the involvement of tangible property. Certain labor (like installation labor when separately contracted) may be non-taxable.

Common exemptions from Illinois sales tax include:

• Sales to qualifying non-profit organizations
• Sales of certain newspapers and magazines
• Sales of machinery and equipment used in manufacturing or production agriculture
• Sales to governmental bodies
• Sales of grocery items (only at the state level, local taxes may apply)

Remote sellers or out-of-state retailers without physical presence but with nexus (economic connection) must collect and remit state and local ROT.

Unsure whether your products or services are taxable in Illinois?
SalesTaxSolutions.US can review your business activities and help you determine whether you’re required to collect and remit Illinois sales tax.

Do You Have Sales Tax Nexus in Illinois? 

Sales tax nexus is a crucial concept for businesses to understand. Basically, it determines whether a company has sufficient connection to a state, and therefore if they need to collect and remit sales tax. Let’s explore the two types of nexus in Illinois.

Physical Sales Tax Nexus

A business has physical nexus in Illinois if it has a tangible presence in the state, such as:

• A brick-and-mortar store or retail location
• Employees operating in Illinois
• Inventory stored in Illinois warehouses or distributed from within the state
• Agents, independent contractors, or sales representatives conducting business in Illinois

For out-of-state sellers, maintaining inventory, a physical office, or distribution facilities in Illinois creates physical nexus.

Economic Sales Tax Nexus 

Illinois economic nexus applies to remote sellers and marketplace facilitators with:

• $100,000 or more in gross receipts from Illinois sales during the prior 12 months

Previously, Illinois had a transaction threshold set for economic nexus, but this was eliminated effective January 1, 2026.

Remote sellers must monitor their Illinois sales on a rolling quarterly basis to determine if the $100,000 threshold has been met and whether they must register and collect tax.

Exceeded the $100,000 Illinois sales threshold?
SalesTaxSolutions.US can help you register, begin collecting tax correctly, and stay compliant under Illinois’s updated economic nexus rules.

Are Marketplace Facilitators Required to Collect and Remit Sales Tax? 

Yes. Marketplace facilitators are generally required to collect and remit Illinois sales tax if they meet the economic nexus threshold ($100,000). A marketplace facilitator is defined by statute and regulation as an entity that:

• Lists or advertises tangible personal property for sale by third-party sellers, and
• Collects payment from customers and transmits it to sellers, regardless of compensation.

Common examples of marketplace facilitators include:

• Amazon 
• eBay 
• Etsy
• Shopify Shop App
• Walmart (online)

It is important to note that Illinois also clarified that payment processors that only process payments (but do not list, advertise, or control pricing/shipping) are not considered marketplace facilitators for tax purposes.

Illinois Sales Tax Filing 

Ready to register your business with Illinois and file your taxes? Here’s an updated step-by-step process to keep Illinois sales tax compliance easy:

Important Update:
Starting in 2025/2026, destination-based sourcing rules require sellers to source sales to the location where the purchaser takes possession. Failure to provide adequate location information could subject returns to a 15% undetermined location tax rate in some cases.

When Are Sales Tax Returns Due in Illinois? 

Illinois taxpayers are assigned a monthly, quarterly or annual filing frequency depending on their annual tax liability. See the graphic below for a breakdown of these filing frequencies and their due dates. 

Ready to simplify Illinois sales tax compliance?
From nexus reviews to ongoing filings, SalesTaxSolutions.US provides full-service support tailored to your business.