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Ohio Individual Income Tax Filing deadlines and extensions for 2025.
If you are a tax professional working with clients who are residents or have been involved in significant business operations within Ohio, then you might need to file Ohio State Taxes on their behalf. This page outlines the most important tax deadlines and tax extensions for Ohio in 2025.
If your clients are residents or have been involved in significant business operations within Ohio, then they might be required to file Ohio State Taxes. This page outlines the most important tax deadlines and tax extensions for Ohio in 2025.
Ohio C Corporation Tax Deadlines for 2025
You must file and pay The Commercial Activity Tax (CAT) in Ohio by May 11, 2026.
Ohio S Corporation & Partnership Tax Deadlines for 2025
You must file for pass-through entities by April 15, 2026.
Extension to File S Corporation & Partnership Taxes in Ohio for 2025
Ohio does not grant extensions for filing Commercial Activity Tax returns.
Estimated Tax Deadline for Ohio 2025
Estimated tax payments are due:
See Ohio IT-1040 ES for the amount to pay with each voucher.
Individual Tax Deadline for Ohio 2025
You must file and pay Individual Income Taxes in Ohio by April 15, 2026.
Extension to File Taxes in Ohio for 2025
The Extension Deadline for Ohio individual income tax returns is October 15, 2026.
Ohio will automatically grant a six-month extension on filing personal income taxes if a federal extension is filed. There is no Ohio-specific extension form, Federal Form 4868 serves as the Ohio extension request.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
Estate Tax Deadline for Ohio 2025
Ohio does not have an Estate Tax.
Farmer and Fisherman Taxes for Ohio 2025
If at least 2/3 of your client’s gross income for the taxable year is derived from farming, they may pay estimated tax at any time on or before January 15, 2026. If they wait until January 15, 2026, they must pay the entire balance of the estimated tax. However, if farmers file their tax return on or before March 1, 2026 and pay the total tax at that time, they need not file estimated tax.
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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
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