Form IL-941 Information and Instructions
Form IL-941 provides essential information regarding Illinois income tax withholding requirements for employers. It outlines who needs to file, how to file, and when to file, ensuring compliance with Illinois tax laws. This form is crucial for reporting wages, pensions, lottery winnings, and other income subject to Illinois withholding tax.
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How do I fill this out?
To fill out Form IL-941, start by gathering all necessary payroll data for the reporting period. Ensure you have accurate information on the amounts withheld from employees and other payees. Follow the detailed instructions provided in the form to enter the correct figures and submit it on time.

How to fill out the Form IL-941 Information and Instructions?
1
Gather all necessary payroll data for the reporting period.
2
Complete the required fields accurately, based on the payroll information.
3
Attach any necessary schedules or additional documentation.
4
Review the completed form for accuracy and compliance.
5
Submit the form before the due date specified.
Who needs the Form IL-941 Information and Instructions?
1
Employers paying wages subject to Illinois withholding tax.
2
Businesses issuing 1099 forms to contract workers.
3
Individuals receiving pensions or annuities subject to withholding.
4
Those with lottery winnings of $1,000 or more.
5
Organizations involved in gambling that report winnings subject to tax.
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What are the instructions for submitting this form?
Submit Form IL-941 electronically through MyTax Illinois for speedy processing. Alternatively, you can fax the completed form to the Illinois Department of Revenue at (XXX) XXX-XXXX. For physical submissions, mail the form to the Illinois Department of Revenue, PO Box XXXXX, Springfield, IL XXXXX. Ensure you keep a copy for your records.
What are the important dates for this form in 2024 and 2025?
For 2024, the Form IL-941 is due on the last day of the month following each quarter: April 30th, July 31st, October 31st, and January 31st of the following year. For 2025, similar due dates apply. Always check for updates as due dates may shift depending on holidays or weekends.

What is the purpose of this form?
The purpose of Form IL-941 is to report Illinois income tax withheld from employees and other income sources. It ensures that employers comply withstate tax regulations and remain accountable for withholding requirements. Proper completion and timely submission of this form are crucial for avoiding penalties and maintaining good standing with tax authorities.

Tell me about this form and its components and fields line-by-line.

- 1. Step 4: This section details the exact amounts withheld from employee compensation on specific days.
- 2. Line 2a: Total income tax withheld for the first month of the quarter.
- 3. Line 2b: Total income tax withheld for the second month of the quarter.
- 4. Line 2c: Total income tax withheld for the third month of the quarter.
- 5. Total Amount: Cumulative withheld tax amount reported for the entire quarter.
What happens if I fail to submit this form?
Failing to submit Form IL-941 could lead to penalties from the Illinois Department of Revenue. Employers risk complications in their withholding accounts and potential audits if the form is not submitted accurately and on time.
- Penalties: Failure to file may result in monetary penalties imposed by state authorities.
- Inaccurate Reporting: Late or missing filings can lead to incorrect reporting of withheld taxes.
- Legal Issues: Continued non-compliance can result in legal repercussions and audits.
How do I know when to use this form?

- 1. Regular Payroll: Use this form for regular employee payroll withholding.
- 2. Contract Payments: Necessary for reporting taxes withheld from payments to contractors or freelancers.
- 3. Pension Withholding: Required for reporting withholding from pension or retirement income.
Frequently Asked Questions
What is Form IL-941?
Form IL-941 is used to report Illinois income tax withholding for employers.
Who needs to file Form IL-941?
Employers who pay wages or have other income subject to Illinois withholding tax must file this form.
When is Form IL-941 due?
Form IL-941 is due by the last day of the month following each quarter.
How do I fill out Form IL-941?
Gather your payroll data and follow the instructions provided in the form.
Can I file Form IL-941 electronically?
Yes, you can file Form IL-941 electronically using MyTax Illinois or approved tax software.
What attachments are required with Form IL-941?
You must attach Schedule P and potentially Schedule WC if applicable.
What happens if I don't file Form IL-941?
Failing to file may result in penalties and complications with your withholding account.
How can I pay any taxes due with Form IL-941?
Payments can be made electronically through MyTax Illinois.
Is there any option to correct errors after filing?
Yes, if you need to correct an error, you can file Form IL-941-X.
Are there specific electronic filing requirements?
Yes, certain employers are required to file electronically and submit specific forms like W-2 digitally.
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