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Setting up access to your MyTax Illinois account is easy. To set up your access, you must complete specific information about yourself and your company. After IDOR verifies your submitted information—usually within a minute or two—we will send a message to the email address you provided giving you the authorization code needed for your initial login. Note: The authorization code is only required for your first login. For step-by-step instructions and troubleshooting, see the Authentication Guide.