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Web register faster using mytax illinois, our online account management program, available on our website at tax.illinois.gov. Identify your business or organization 1 federal employer identification number (fein) fein: Web filing online is quick and easy! Click here to go to mytax illinois to file your application online click here to download the pdf form. Register faster using mytax illinois, our online account management. Web proprietorship — the owner (if husband/wife or civil union, enter both individuals’ information) partnership — each general.