When Are Oklahoma State Income Taxes Due?
Understand the key timing considerations for Oklahoma state income tax. This guide clarifies the distinct deadlines for filing, paying, and estimated tax payments.
Oklahoma mirrors the federal government’s system of tax deadlines, requiring residents to file returns and pay any taxes owed by specific dates. Understanding these key dates is the first step in complying with state tax obligations and avoiding unnecessary financial penalties.
Annual Income Tax Filing Deadline
The primary deadline for filing an Oklahoma individual income tax return, such as Form 511, is April 15. This date aligns with the federal income tax deadline. If the 15th of April happens to fall on a Saturday, Sunday, or a legal holiday, the due date automatically shifts to the next business day. This rule ensures that taxpayers always have a full filing period that is not cut short by weekend or holiday closures.
For the tax year 2024, the filing deadline is April 15, 2025. This is the date by which your tax return must be electronically filed or postmarked if sending by mail. It is also the deadline for paying any tax liability you have calculated for the year.
Oklahoma Tax Filing Extension Deadline
Filing for an extension provides taxpayers with an additional six months to submit their Oklahoma income tax return, moving the deadline to October 15. Oklahoma automatically grants this extension if you have successfully filed for a federal extension with the IRS. If you do not need a federal extension but require one for the state, you must file Form 504-I, Application for Extension of Time to File, by the original April 15 due date.
An extension only provides more time to file, not more time to pay your taxes. To avoid penalties and interest, you must estimate your tax liability and pay that amount by the original April 15 deadline.
Quarterly Estimated Tax Due Dates
Certain taxpayers are required to pay their income taxes throughout the year in quarterly installments. This requirement generally applies to individuals who receive significant income not subject to withholding, such as earnings from self-employment, investments, or rental properties. These payments, known as estimated taxes, ensure that you are paying taxes as you earn income, similar to how taxes are withheld from an employee’s paycheck.
The due dates for these quarterly payments are spread throughout the year. The four payment periods and their corresponding deadlines are:
- April 15
- June 15
- September 15
- January 15 of the following year
Consequences of Missing a Deadline
Failing to meet Oklahoma’s tax deadlines can lead to financial repercussions in the form of penalties and interest. The state imposes a failure-to-file penalty for submitting your return after the due date, including any approved extensions. A separate failure-to-pay penalty is assessed for not paying the taxes you owe by the original April 15 deadline.
These penalties are calculated based on the amount of unpaid tax and how long the balance remains outstanding. On top of these penalties, interest accrues on the underpaid amount from the original due date until the tax is paid in full.