The State of Illinois will automatically grant you a 6-month business income tax extension (seven months for corporations) without filing any paperwork. However, you need to submit the proper Illinois state tax extension voucher form if your business owes the state money.

If your business does not need to make a tax payment and has received an acceptance notification from FileLater, there’s nothing more to do.

Filing a Illinois tax extension will not provide you with additional time to pay any tax balance due, which must be paid by your original filing deadline or interest and other payment penalties may apply.

For additional information, please visit the State of Illinois Department of Revenue website.

Print and Mail:
Illinois State Tax Extension Payment Voucher Form IL-505-B (PDF)