Ohio Business State Tax Extension I C Corporations Filing Guide

Online Only  ·  C-Corporations  ·  Business Filing Guide

Ohio C Corporations are subject to state corporate income tax requirements, administered by the Ohio Department of Taxation. Ohio grants an automatic extension tied to an approved IRS extension, making the process simple for businesses that have already filed IRS Form 7004.

Ohio C Corporations (Commercial Activity Tax filers) are not eligible for an extension of time to file. The return must be filed by the original due date of May 11, 2026. Plan accordingly to avoid late filing penalties.

Use the Ohio | Online Tax Extension Payment to pay electronically. For mail-in payments, use Online Only and send to: Online Only

• File IRS Form 7004 with the IRS to secure your federal extension, which Ohio automatically honors.
• Use the state online payment portal for fast, convenient electronic payment.
• File your Ohio C-Corporations return by the original due date of May 11, 2026.

• Ohio C Corporations are not eligible for a tax extension. File your C-Corporations return by May 11, 2026 to avoid late filing penalties.
• Quick Reference Table
• State Abbreviation
• OH
• State Name
• Ohio
• Business Entity Type
• C-Corporations
• Extension Status
• None
• Extended Due Date
• Not Allowed
• Online Payment
• Ohio | Online Tax Extension Payment
• Payment Voucher Form
• Online Only
• State Payment Agency
• Ohio Department of Taxation
• Mailing Address with Payment
• Online Only

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Quick Reference Table