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TAX DEADLINES

Federal & Illinois Tax Deadlines 

Stay on top of key federal and Illinois tax deadlines with a clearer, more organized filing calendar for businesses, investors, and individuals.

Secure portal workflow. Clear next steps. Direct CPA support

Calendar and tax documents highlighting federal and Illinois tax deadlines reviewed by Hym

Federal Tax Deadlines

IRS Form
Deadline
Form 1040
April 15
Form 4868
April 15
Form 1065
March 15
Form 1120-S
March 15
Form 1120
April 15
Forms W-2 and 1099
January 31
Form 941
Quarterly
Form 940
January 31
Form 944
January 31

Need help meeting federal deadlines? Talk to a CPA

Illinois Tax Deadlines

Illinois Form
Deadline
IL-1040
April 15
IL-505-I
April 15
IL-1065
March 15
IL-1120-ST
March 15
IL-1120
April 15
W-2 and 1099
January 31
IL-941
Quarterly
IL-W-3
January 31

Illinois generally follows federal deadlines, but penalties and interest rules differ. CPA guidance is recommended for business owners and multi-state filers.

Get Illinois CPA Guidance

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