Tax Deadlines

Federal Tax Calendar

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Illinois Tax Calendar

Income Tax:
https://www2.illinois.gov/rev/research/taxinformation/income/Pages/default.aspx
Sales Tax:
https://www2.illinois.gov/rev/research/taxinformation/sales/Pages/rot.aspx
Payroll Tax:
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Indiana Tax Calendar 

http://www.in.gov/dor/3344.htm