What is the difference between federal and state payroll taxes?

Understanding the Difference Between Federal and Illinois State Payroll Taxes

When managing payroll in Illinois, it is essential to distinguish between federal and state payroll taxes. Each type serves different purposes and requires separate compliance steps.

Federal Payroll Taxes

• Purpose: Fund national programs such as Social Security, Medicare, and federal unemployment insurance.
• Components: Includes Federal Insurance Contributions Act (FICA) taxes, which cover Social Security and Medicare, and Federal Unemployment Tax Act (FUTA) taxes.
• Withholding: Employers must withhold employee portions of Social Security and Medicare taxes from wages and contribute an employer share.
• Reporting: Employers file Form 941 quarterly to report federal payroll taxes withheld and paid.

Illinois State Payroll Taxes

• Purpose: Primarily fund state unemployment insurance and state income tax withholding.
• Components: Includes Illinois state income tax withholding and State Unemployment Insurance (SUI) tax paid by employers.
• Withholding: Employers must withhold Illinois state income tax from employee wages based on state withholding tables.
• Reporting: Employers report withheld state income taxes and pay SUI contributions to the Illinois Department of Revenue and Illinois Department of Employment Security, respectively.

Operational Considerations for Illinois Employers

• Registration: Register with both the IRS for federal payroll tax purposes and with Illinois state agencies for state tax withholding and unemployment insurance.
• Compliance: Maintain accurate payroll records to ensure correct withholding, timely deposits, and proper reporting to avoid penalties.
• Automation: Use payroll software that supports both federal and Illinois state tax calculations and filings to streamline operations.
• Updates: Stay informed on annual changes to tax rates, wage bases, and reporting requirements as of 2026 to maintain compliance.