How do I access MyTax Illinois?
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Questions and Answers
https://www2.illinois.gov/rev/questionsandanswers/Pages/862.aspx
e-Services for Businesses –
e-Services for Businesses
https://www2.illinois.gov/rev/programs/electronicservices/businesses/Pages/default.aspx
Individuals –
Individuals
https://www2.illinois.gov/rev/individuals/Pages/default.aspx
Illinois Employer Tax Information | Square Support Center – US
https://squareup.com/help/us/en/article/5784-illinois-employer-tax-information