Instructions alternative 2026

1. Click ‘Get Form’ to open it in the editor.
2. Begin by completing Line 1. Fill in all applicable rows of the table to calculate your tax due by multiplying the number of gallons by the tax rate. Refer to the Tax Rate Database for accurate rates.
3. On Line 2, enter the total amount of Illinois Motor Fuel Tax paid for diesel gallons purchased for blending. Remember to attach invoices as supporting documentation.
4. Subtract Line 2 from Line 1 on Line 3 to determine your tax amount owed.
5. If you have any credits, enter them on Line 4 and subtract this from Line 3 on Line 5 to find your final tax liability.
6. Finally, ensure that you sign the form at the bottom before submission, as it cannot be processed without a signature.

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