Ohio Business Tax Extension 2026: 2025 Tax-Year Filing Guide
LLC & Partnership · S Corporation · C Corporation · Fiduciary
This guide explains how to file an Ohio (OH) business tax extension for each entity type. For example, Ohio taxpayers generally receive the applicable CAT filing schedule, while partnerships generally receive the applicable CAT filing schedule. However, estimated tax remains due by the original deadline.
Need a pro? Connect with a U.S.-based CPA or EA to prepare and file your OH return.
Remember, payment is still due by the original deadline. In other words, extensions only extend filing time.
Ohio (OH) rules depend on entity type. Next, confirm the entity’s classification, file the required extension or retain federal proof when applicable, and pay required tax by the original deadline.
Ohio LLC Tax Extension: Filing Details
A calendar-year partnership or LLC taxed as a partnership generally files Forms CAT annual return, as applicable, when an Ohio filing obligation applies. Ohio does not impose a traditional corporate income tax. Businesses subject to the Commercial Activity Tax (CAT) file according to the CAT schedule shown by the Department of Taxation.
In addition, the extension applies to filing time only. Therefore, pay required Ohio tax by the original deadline to limit penalties and interest.
The extension applies to filing time only. Pay required Ohio tax by the original deadline to limit penalties and interest.
Ohio S Corporation Tax Extension: Filing Details
For an S corporation, a calendar-year business generally files Form CAT annual return when it has an Ohio filing obligation. Ohio does not impose a traditional corporate income tax. CAT filing requirements depend on the taxpayer’s CAT filing frequency.
Ohio C Corporation Tax Extension: Filing Details
For a C corporation, a calendar-year business generally files Form CAT annual return and must follow Ohio ohio tax extension rules. Ohio does not impose a traditional corporate income tax. CAT filing requirements depend on the taxpayer’s CAT filing frequency.
The extension applies to filing time only. Pay required Ohio tax by the original deadline to limit penalties and interest.
The extension applies to filing time only. Pay required Ohio tax by the original deadline to limit penalties and interest.
Fiduciary, Estate, and Trust Filing Details
Finally, a calendar-year estate or trust generally files Form CAT annual return when it has an Ohio fiduciary filing obligation. Ohio does not impose a traditional corporate income tax. CAT filing requirements depend on the taxpayer’s CAT filing frequency.
Quick Reference: Deadlines and Forms
The table below provides a quick reference to Ohio business tax extensions. See our IRS Form 7004 guide, Ohio individual tax extension, and business tax extension resource for related guidance.
| Entity Type | OH Return Form | Extension Method | Extended Deadline |
|---|---|---|---|
| LLC / Partnership | CAT annual return | Federal extension;; Ohio Taxpayer Access Point | Sept. 15, 2026 |
| S Corporation | CAT annual return | Ohio Taxpayer Access Point | See CAT schedule |
| C Corporation | CAT annual return | Ohio Taxpayer Access Point | See CAT schedule |
| Fiduciary / Estate / Trust | CAT annual return | Form Ohio Taxpayer Access Point | See CAT schedule |
Frequently Asked Questions
Quick answers about Ohio business tax extensions – but always confirm the current rules with the Ohio Division of Taxation.
Visit OH DORYes. However, the applicable entity-specific requirements listed above must be satisfied. Ohio grants extensions to LLCs, partnerships, S corporations, C corporations, and fiduciaries, but the rules – including which form to file, how long the extension lasts, and the payment threshold – vary by entity type.
Generally no. In other words, pay required tax by the original deadline and confirm the current state payment rules. An extension of time to file does not extend the time to pay – failing to pay by the original deadline can result in penalties and interest, even if the return is filed within the extended window.
No. In practice, partnerships, S corporations, C corporations, and fiduciaries can use different original dates, extension periods, or forms. For 2025 calendar-year returns filed in 2026, partnerships and LLCs taxed as partnerships get a five-month extension (Sept. 15), while the others generally get a six-month extension (Oct. 15).
Review the Ohio Division of Taxation guidance for the entity’s return. Additionally, the DOR publishes the most current forms (Ohio Taxpayer Access Point, Ohio Taxpayer Access Point, Ohio Taxpayer Access Point, etc.) and any changes to extension periods or payment thresholds.
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