Illinois Department of Revenue (IDOR)

Sep 24, 2026

Access the Illinois Department of Revenue (IDOR) here.

The Illinois Department of Revenue (IDOR) is the state agency responsible for collecting and administering taxes in Illinois. They ensure compliance with state tax laws and regulations to support government programs and services for residents of Illinois.

Agency Accounts

Illinois Business Income Tax Account

Access your online account via MyTax Illinois.

The Illinois Business Income Tax Account allows you to set up and manage the following information:

  • Taxpayer ID (Business Income Tax)

Illinois Sales Tax Account

Access your online account via MyTax Illinois.

The Illinois Sales Tax Account allows you to set up and manage the following information:

  • Sales Tax Account ID

Illinois Sales Tax-Exempt Account

Access your online account via MyTax Illinois.

The Illinois Sales Tax-Exempt Account allows you to set up and manage the following information:

  • Sales Tax-Exempt Number

Illinois Withholding Tax Account

Access your online account via MyTax Illinois.

The Illinois Withholding Tax Account allows you to set up and manage the following information:

  • Taxpayer ID (Withholding Tax)

Illinois Purchase Sales Tax Exemption Account

The Illinois Purchase Sales Tax Exemption Account allows you to set up and manage the following information:

  • Purchase Exemption Registration Date : Date that your purchase exemption registration was filed in Illinois.

Find out more on how to stay compliant with the Illinois Department of Revenue (IDOR):

Zero payroll penalties, zero distractions.

More from the blog

Learn how to keep your business compliant in all 50 states across payroll, HR, Secretary of State, and tax.

Case Study: MediaRadar

How MediaRadar Navigated a Multi-State PEO Transition and Centralized Compliance with Mosey MediaRadar transitioned off a PEO and onboarded 350 employees across 40 states—saving over 80 hours and thousands in labor costs while streamlining compliance with Mosey. “If you’re moving off a PEO, Mosey is the system you wish you had from day one. It saves time, reduces stress, and gives your team the confidence that you’re not missing anything.”

Paul Boynton | May 14, 2025

Certificate of Good Standing: What Is It & How It Works

Consider the following scenario: You’re the founder of a new startup, which you incorporated in Delaware, but you live in California. You need to register your company as a foreign entity to do business there. But before you can register in California, you’ll need to obtain a Certificate of Good Standing from your incorporated state of Delaware. Essentially, a Certificate of Good Standing validates the legitimacy of your business. Business owners might use a Certificate to register to do business in another state, apply for a business loan or insurance, seek financing from investors, or lease commercial space.

Alex Kehayias | Apr 3, 2023

California Paid Sick Leave: What HR Needs to Know

Managing sick leave in California is so much more than just giving employees time off when they’re under the weather. In reality, it’s a complex web of state laws, local ordinances, and compliance requirements that can trip up even the most diligent employers. With recent legislative changes expanding sick leave minimums and tightening enforcement, getting it wrong could mean hefty penalties, employee lawsuits, and serious damage to your company culture.

Paul Boynton | Jul 1, 2025

Ready to get started?