Ohio tax deadlines in 2026: filing dates and estimated payments
Deadlines that fall in calendar 2026: the 2025 return and the 2026 estimated payments. Different year? See Ohio 2025 →
Ohio deadlines in 2026
| 2025 individual return due | April 15, 2026 |
|---|---|
| Extended filing deadline | October 15, 2026 |
| Payment due | April 15, 2026, extension or not |
| Final 2025 estimated payment | January 15, 2026 |
| 2026 estimated payments | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Conforms to the federal deadline; follows the federal extension to October 15.
Ohio estimated tax payments in 2026
You should make estimated payments if your estimated Ohio tax liability (total tax minus total credits) less Ohio withholding is more than $500; if your income is subject to Ohio withholding you generally do not need to make them.
| Q1 (2026 tax year) | April 15, 2026 |
|---|---|
| Q2 (2026 tax year) | June 15, 2026 |
| Q3 (2026 tax year) | September 15, 2026 |
| Q4 (2026 tax year) | January 15, 2027 |
| Voucher | Ohio IT 1040ES (paper payments use the Ohio Universal Payment Coupon) |
| Pay online | myportal.tax.ohio.gov |
School district estimated tax uses the same coupon and schedule. An alternative to estimates is filing a revised Ohio IT 4 to increase withholding. Underpayment interest is computed on Ohio form IT/SD 2210.
Source: tax.ohio.gov, read September 3, 2026. “2026 Payment Due Dates: 1st Quarter - April 15, 2026 2nd Quarter - June 15, 2026 3rd Quarter - Sept. 15, 2026 4th Quarter - Jan. 15, 2027”
All 51 jurisdictions in one table: state estimated tax payment dates for 2026.
Ohio extensions
Every state's rule in one table: which states accept the federal extension in 2026.
| Does Ohio accept the federal extension? | Yes. A federal extension is honored; no state form. |
|---|---|
| Original due date | April 15, 2026 |
| Extended due date | October 15, 2026 |
| Payment | Still due April 15, 2026. The extension is to file, not to pay. Even with a filing extension, all tax payments are due by April 15, 2026. |
| How to get it | File federal Form 4868; when you file the Ohio IT 1040, check the federal-extension box and include a copy; pay any tax with the Ohio Universal Payment Coupon (OUPC) or online by April 15. |
The former IT 40P extension payment voucher is now part of the Ohio Universal Payment Coupon.
Source: tax.ohio.gov, read September 3, 2026. “Ohio does not have an extension request form but honors the IRS extension. Even if you have a filing extension, all tax payments are due by April 15, 2026.”
Federal deadlines in 2026
| 2025 Form 1040 | April 15, 2026 · extension October 15, 2026 |
|---|---|
| 2025 S-corp (1120-S) & partnership (1065) | March 16, 2026 |
| 2025 C-corp (Form 1120) | April 15, 2026 |
| 2026 federal estimated payments (1040-ES) | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Source: IRS Publication 509 and Form 1040-ES instructions, irs.gov.
Frequently asked questions
When are Ohio state taxes due in 2026?
Your 2025 Ohio individual income tax return is due April 15, 2026. If that date falls on a weekend or legal holiday, the deadline moves to the next business day. An extension moves the filing deadline to October 15, 2026, but any tax owed is still due on the original date.
When are Ohio estimated tax payments due in 2026?
Ohio estimated payments for the 2026 tax year are due April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027. Use Ohio IT 1040ES (paper payments use the Ohio Universal Payment Coupon) or pay online. The final installment for 2025 was due January 15, 2026.
Does Ohio accept the federal extension?
Yes. A federal extension is honored; no state form. The extended filing deadline is October 15, 2026, and tax is still due by April 15, 2026.
Does a Ohio extension give me more time to pay?
No. An extension extends the time to file, not to pay. To avoid penalties and interest, pay what you expect to owe by April 15, 2026.
Dates are the statutory deadlines that fall in 2026 and move to the next business day when they land on a weekend or holiday. Each section links to the source it was checked against. Always confirm with the Ohio tax agency or the IRS before relying on a date. This is general information, not tax advice.