2024 Ohio State Tax Deadlines

If you are a resident or have been involved in significant business operations within Ohio, then you might be required to file Ohio State Taxes. We look at the most important tax deadlines and tax extensions for Ohio in 2024.

Ohio Business Tax Deadlines for 2024

C Corporation, S Corporation, & Partnership

Ohio C Corporation Tax Deadlines for 2024

You must file & pay The Commercial Activity Tax (CAT) in Ohio by May 10, 2025.

  • File Online with the Ohio Business Gateway.
  • File by Mail must be postmarked by the due date.

Applicable form:

CAT - Commercial Activity Tax

Form IT 1140 – Ohio Entity Level Income Tax Return for pass-through entities with non-resident owners.

Extension to File Taxes in Ohio for 2024

There is no extension for time to file the Commercial Activity Tax return.

Ohio Individual Tax Deadlines for 2024

Estimated Tax Deadline for Ohio 2024

Estimated tax payments are due:

  • April 15, 2024
  • June 15, 2024
  • September 15, 2024
  • January 15, 2025

See Ohio IT-1040 ES for the amount to pay with each voucher.

Individual Tax Deadline for Ohio 2024

You must file & pay Individual Income Taxes in Ohio by April 15, 2025.

  • File Online with the Ohio Department of Taxation
  • File by Mail must be postmarked by the due date

Applicable forms:

Form IT 1040 – Ohio Individual Income Tax Return

Extension to File Taxes in Ohio for 2024

You must send payment for taxes in Ohio for the fiscal year 2023 by April 15, 2024.

The Extension Deadline is October 15, 2025, to file your Ohio Individual Income tax return.

Ohio will automatically grant a 6 months 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, 2025.

Estates Tax Deadline for Ohio 2024

Ohio does not have an Estate Tax.

Farmer and Fisherman Taxes for Ohio 2024

If at least 2/3 of your gross income for the taxable year is derived from farming, you may pay estimated tax at any time on or before January 15, 2025. If you wait until January 15, 2025, you must pay the entire balance of the estimated tax. However, if farmers file their tax return on or before March 1, 2025, and pay the total tax at that time, they need not file estimated tax.


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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