Sales Tax in Illinois: A Complete Guide for Ecommerce Sellers

Illinois is notably not an SST member state despite its size and has a complex local tax environment driven by home rule municipalities that can levy additional taxes outside the standard state system. The state rate for general merchandise is 6.25%, but Chicago’s combined rate reaches 10.25% when all layers are added. Illinois’s home rule tax structure makes it one of the more technically complex states for ecommerce sellers.

Quick reference

Economic nexus

Illinois uses an OR threshold: $100,000 in gross receipts OR 200 or more separate transactions into Illinois in the preceding 12-month period. Either condition, if met, triggers the registration requirement.

The measurement period is a rolling 12-month window, not a calendar year. Sellers should monitor both conditions continuously.

Illinois enacted its economic nexus law effective January 1, 2020.

Physical nexus

Physical presence in Illinois creates nexus immediately:

• Warehouse, office, or storage facility in Illinois
• Amazon FBA inventory in Illinois fulfillment centers (Amazon has fulfillment centers in Joliet, Edwardsville, and other Illinois locations)
• Employees or agents in Illinois
• Sales representatives in Illinois

Registration

Register through MyTax Illinois (mytax.illinois.gov). Registration is free. Illinois issues a Certificate of Registration.

Sellers registering with economic nexus should indicate “remote seller” status on the application.

Tax rates

State rate: 6.25% for general merchandise; 1% for qualifying food, drugs, and medical appliances.

Home rule municipalities: Illinois has a unique home rule system. Municipalities with home rule authority (those with populations above 25,000 or that have voted to assume home rule status) can levy additional sales taxes at rates they set independently, including taxes that don’t appear in the standard Illinois rate lookup.

Chicago composite rate: 6.25% state + 1.25% city + 1.75% Cook County + 1% Regional Transportation Authority = 10.25%.

Illinois provides a rate lookup tool through the IDOR website, but verifying rates for Chicago and Cook County addresses often requires checking multiple overlapping authorities.

What’s taxable

Generally taxable (at 6.25%): Electronics, clothing, furniture, sporting goods, most tangible personal property.

Lower rate (1%):

• Qualifying food for human consumption (groceries)
• Prescription and non-prescription drugs
• Medical appliances

Generally exempt:

• Prescription medications (the 1% rate applies, some states fully exempt; Illinois uses a reduced rate)
• Agricultural machinery and equipment

Notable Illinois rules:

• Digital products: Illinois taxes specified digital products, including downloaded software, digital books, and streamed content classified as a digital service
• SaaS: Illinois taxes SaaS as a taxable service in certain circumstances — Illinois’s approach to cloud computing and SaaS is more aggressive than many states
• Candy: Taxable at the full 6.25% rate (not eligible for the 1% food rate)

Shipping taxability

Shipping charges in Illinois are taxable when the goods being shipped are taxable. The charges must be separately stated to qualify for the same treatment as the goods, bundled shipping and handling included in the sale price is generally all taxable.

Marketplace facilitator rules

Illinois enacted marketplace facilitator legislation effective January 1, 2020. Qualifying marketplace facilitators collect and remit Illinois sales tax on marketplace-facilitated sales.

Illinois has specific rules about which sellers must separately register when they also sell through marketplace facilitators. Remote sellers whose only Illinois sales are through marketplace facilitators may not need to register, but sellers with physical nexus must register regardless.

State-specific notes

Home rule municipalities: Illinois’s home rule system creates a patchwork of local rates that aren’t fully captured in standard rate tables. Chicago, Oak Park, Evanston, and many Cook County municipalities have home rule taxes. Sellers with high Illinois volume need rooftop-level calculation that includes home rule tax layers.

Chicago is an extreme case: Chicago’s effective combined rate can vary block by block based on which overlapping special taxing districts apply. Use IDOR’s rate lookup tool or a calculation engine that includes Chicago home rule data.

Destination vs. origin sourcing: Illinois uses destination sourcing for remote sellers, tax is based on the customer’s location. Intrastate Illinois sellers historically used origin sourcing (where the seller is located), though this has been a subject of ongoing administrative guidance. Remote sellers use destination sourcing.

Reduced rate for food and drugs: Illinois’s 1% reduced rate for food and drugs applies broadly to grocery staples and over-the-counter drugs, it’s one of the few states with a reduced rate rather than a full exemption. Sellers of food, supplement, or healthcare products need to apply the 1% rate correctly rather than the full 6.25%.