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Tax Worksheet based on your changes. Write the refigured amount from Line 10 on your Amended Estimated Tax Worksheet, Line 1. follow the Amended Estimated Tax Worksheet instructions for Lines 2 through 8. Fiscal-year taxpayers Please adjust the due dates to correspond to your tax year. Electronic Payment Options If you determine that you must make estimated tax payments, we encourage you to use one of the following electronic payment options: Online Visit our website at tax.illinois.

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