Illinois Marketplace Facilitator Rules: What Sellers Need to Know for 2026

Key Takeaways

• Illinois requires marketplace facilitators to collect and remit Illinois Retailers’ Occupation Tax (ROT) on marketplace sales shipped to Illinois customers.
• Illinois uses destination-based tax for remote/marketplace sales and requires location-specific (rate/ROE) reporting through MyTax Illinois.
• Marketplace sellers often owe Illinois Use Tax on taxable purchases and may still need Illinois registration depending on their non-marketplace activity.
• Accurate local rate assignment matters in Illinois because the same item can face different combined rates by destination (including Chicago and Cook County differences).

Illinois marketplace facilitator rules affect how online sellers and platforms handle sales tax, ROT reporting, and local rate sourcing in 2026. Illinois treats marketplace facilitators as the party responsible for tax on facilitated sales shipped to Illinois, while individual sellers may still have separate Illinois obligations for direct (non-marketplace) sales, business purchases, and certain registrations.

How Illinois Defines a Marketplace Facilitator (and What That Means)

Illinois agency oversight

Illinois sales and use tax administration is handled by the Illinois Department of Revenue (IDOR). Registration, filings, and account maintenance are commonly managed through MyTax Illinois (IDOR’s online taxpayer portal).

Core facilitator responsibilities in Illinois

In Illinois, a marketplace facilitator that facilitates taxable sales delivered into Illinois is generally responsible for:

• Collecting applicable Illinois tax on marketplace transactions shipped to Illinois destinations
• Filing the appropriate Illinois returns and remitting tax to IDOR
• Handling local rate application based on the Illinois destination (sourcing) approach used for remote/marketplace sales

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Illinois-Specific Quirks Sellers Should Know for 2026

Illinois is an ROT state with multiple layers that make local rates feel “different”

Illinois is often discussed in terms of “sales tax,” but Illinois’ primary transaction tax is Retailers’ Occupation Tax (ROT), with related use tax concepts. For remote and marketplace transactions shipped into Illinois, Illinois applies a destination-based approach that requires accurate local rate assignment by shipping location. This can make Illinois more rate-sensitive than many states for sellers with broad statewide reach.

Destination-based rates and location reporting matter in Illinois

For marketplace activity shipped to Illinois buyers, the correct combined rate depends on the customer’s delivery destination (state + local components). A key operational requirement is ensuring you can apply the correct Illinois local rate and report it appropriately in your filing approach (including any required location/ROE reporting conventions used by IDOR).

Illinois form references sellers see often

Depending on your role (marketplace facilitator vs. seller with direct sales), Illinois form and return names you may encounter include:

• Form ST-1 (Sales and Use Tax and E911 Surcharge Return)
• Form ST-2 (Multiple Site Form / schedule used for site-specific reporting when applicable)

Who Collects in Illinois: Facilitator vs. Marketplace Seller

When the marketplace facilitator collects Illinois tax

For marketplace orders shipped to Illinois addresses that are facilitated by a marketplace platform, the facilitator is generally the party responsible for collecting and remitting the applicable Illinois tax on those sales. Many Illinois marketplace sellers will see Illinois tax collected at checkout by the facilitator and reflected on settlement reports.

When the marketplace seller may still have Illinois responsibilities

Even if the marketplace collects Illinois tax on facilitated sales, a seller may still need to handle Illinois obligations such as:

• Tax on direct website or other non-marketplace Illinois sales (if registered/required to register)
• Illinois Use Tax on taxable business purchases where Illinois tax was not paid to a vendor
• Maintaining Illinois account information in MyTax Illinois if IDOR requires registration for your business activities

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Illinois Sales Tax Rate Snapshot (State + Local Examples)

Illinois has a statewide base rate, and many areas impose additional local taxes. The figures below reflect common combined rates in major cities; rates can change, so operationally you should use destination-based rate assignment for each shipment address.

Registration and Filing in Illinois (MyTax Illinois + What to Expect)

Where to register: MyTax Illinois

Illinois sales and use tax registration is typically completed through MyTax Illinois. Your registration type and account setup depend on whether you are registering as a retailer making sales into Illinois, whether you have Illinois locations, and how you sell (direct vs. marketplace).

What sellers and facilitators commonly file

Illinois filing frequencies and required schedules vary by account and volume, but many filers will see:

• ST-1 as the primary return
• ST-2 or other location schedules if site-specific reporting applies

Operational documentation to retain

For 2026 readiness, keep marketplace settlement reports and records that clearly show:

• Illinois delivery addresses (destination sourcing)
• Tax collected by the facilitator (by transaction and by period)
• Gross sales, returns, exemptions (if any), and taxable sales totals

Practical 2026 Checklist for Illinois Marketplace Sellers

Step-by-step readiness actions

• Confirm whether your Illinois sales occur only through marketplaces or also through direct channels.
• Verify your marketplace is collecting Illinois tax on delivered-to-Illinois orders and that reports show destination detail.
• Validate rate mapping for key Illinois destinations (Chicago/Cook vs. collar counties vs. downstate cities).
• Review your purchases for potential Illinois Use Tax accrual when vendors did not charge Illinois tax.

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Related compliance topics you may also need

If you also sell outside Illinois, you may want to review multi-state registration and account setup considerations. For example, see North Carolina sales tax number requirements to compare how another state structures registration and filing.

If your marketplace strategy expands into the Midwest, you can also compare with Kansas State Sales Tax Number registration expectations.

Frequently Asked Questions (Illinois Marketplace Facilitator Rules for 2026)

1) Does an Illinois marketplace facilitator have to collect Illinois tax on all marketplace sales shipped to Illinois?

Yes. For taxable marketplace transactions delivered to Illinois addresses, the marketplace facilitator is generally responsible for collecting and remitting the applicable Illinois tax. Illinois uses destination-based rates for these shipped sales, so the correct combined rate depends on the buyer’s Illinois delivery location.

2) If the marketplace collects Illinois tax, do I still need an Illinois sales tax account in MyTax Illinois?

Possibly. If you only make Illinois sales through a marketplace that collects and remits Illinois tax, you may not need to register solely for those marketplace sales. However, Illinois sellers with any direct (non-marketplace) Illinois sales, Illinois locations, or other Illinois tax responsibilities may still need an account through MyTax Illinois with the Illinois Department of Revenue.

3) What is the Illinois state sales tax rate in 2026?

Illinois’ statewide base rate is 6.25%. Many Illinois locations impose additional local taxes, making combined rates higher in cities like Chicago (commonly 10.25%). For marketplace shipments, the destination address determines the combined rate applied.

4) How do Illinois local rates affect my marketplace sales shipped to Chicago vs. Naperville?

They can change the total tax collected on the same item. Chicago’s combined rate is commonly 10.25%, while Naperville is commonly around 8.00%. Illinois requires destination-based tax for shipped marketplace orders, so accurate delivery-address rate assignment is critical for 2026 reporting and reconciliation.

5) Which Illinois forms are most commonly involved for sales and use tax reporting?

Many Illinois sales and use tax filers use Form ST-1 (Sales and Use Tax and E911 Surcharge Return). Businesses with multiple sites or that need site/location reporting may also use Form ST-2 (Multiple Site Form) as part of their filing package, depending on how IDOR has set up the account.

6) I’m an Illinois marketplace seller—what records should I keep for IDOR in 2026?

Keep Illinois-specific documentation that ties to destination sourcing, including: marketplace settlement statements, transaction-level