Illinois DOR issues tax guidance and proposed regulations
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Springfield, Illinois—This week the Illinois Department of Revenue issued guidance and proposed multiple amendments clarifying sales and service occupation tax treatment for medical services, prescription drugs, and out-of-state sellers, and proposing a 15 percent backup rate for retailers lacking adequate records; the proposed regulations were published in the May 29, 2026 Illinois Register. State officials set a July 13 comment deadline and detailed destination-based collection thresholds including a $100,000 cumulative gross receipts test and physical presence criteria; businesses must register via MyTax Illinois and file monthly on Form ST-1, increasing compliance obligations for servicepersons and remote sellers effective upon final rule adoption.
Prepared by Christopher Adams and reviewed by editorial team.
Timeline of Events
- May 29, 2026: Proposed regulations published in the Illinois Register regarding service use and retailers' occupation tax.
- Illinois DOR issues General Information Letter ST 26-0018-GIL clarifying tax treatment for medical services and prescription drugs.
- Illinois DOR publishes guidance on destination-based sales tax obligations and MyTax Illinois registration requirements.
- DOR sets comment deadline for proposed regulations: July 13, 2026.
- Final rules expected after review of public comments and administrative process.
Why This Matters to You
If you're a business owner in Illinois, these proposed tax changes could affect you. The new rules clarify tax treatment for medical services and prescription drugs, and set a backup rate for retailers. They also increase compliance obligations for servicepersons and remote sellers. Check your records and prepare to comment by July 13.
The Bottom Line
The Illinois DOR is tightening up on tax regulations. This means more clarity but also more responsibility for businesses. If you're a retailer or service provider, it's time to review your tax strategy. Worth forwarding if you know someone running a business in Illinois.
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The Illinois Department of Revenue and municipal taxing bodies benefited from clearer rules and potential for improved tax collection and remittance compliance.
Retailers, medical service providers, servicepersons, and remote sellers face increased compliance obligations, potential higher tax rates, and recordkeeping burdens under the proposed rules.
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