Filing Season Open: January 29, 2024. Filing Season Deadline: April 15, 2024.An extension request must be submitted on or before the date the municipal income tax return is due. Download and complete a Form 32 EST-EXT. This gives you until October 15 to file without penalties. If you need more time to file your Ohio tax return, file a federal extension. When you later file your Ohio return, answer Yes to the question. Ohio offers a 6-month extension for individuals that have an approved Federal extension, which moves the filing deadline from April 15 to October 15. The Ohio Department of Taxation doesn't have an extension request form. Instead, filing federal Form 4868 with the IRS serves as the Ohio extension request.