How to File an Oregon State Tax Extension - Deadlines, Payment, and Filing Guide

If tax season snuck up on you, you’re not alone—and the good news is, you still have options.

Oregon state tax extensions are a helpful way to get extra time to file your return without rushing through the process.

Whether you're sorting through paperwork, waiting on key forms, or just need a little breathing room, we will walk you through how to file for an extension, avoid penalties, and stay on track with Oregon’s tax requirements.

Oregon State Tax Filing Deadline

Oregon residents must file their state income tax return by April 15th. This deadline applies to both filing returns and paying tax liabilities. If you're not ready to file by this date, Oregon offers an automatic extension to file—but not to pay.

Failure to file before the April due date can result in penalties, delayed refunds, and unnecessary stress. The good news? Oregon’s extension system is relatively straightforward, especially if you already filed for a federal extension. Here’s the catch—you can take extra time to file your return, but you still need to pay your state taxes by April 15th. No extensions on that part!

Oregon State Tax Extension Information

If you can’t file your Oregon state tax return by the April 15th deadline, you may qualify for an automatic six-month extension, giving you until October 15th to file your return. However, this is an extension to file, not to pay. You must pay taxes owed by April 15th to avoid penalties and interest.

How to File an Oregon Tax Extension

Filing an extension for Oregon is straightforward:

• Automatic Extension with Federal Filing: If you file IRS Form 4868 for a federal extension, Oregon automatically grants you a state extension. No separate Oregon form is required.
• Without Federal Extension: If you’re not filing a federal extension but need more time to file your Oregon return, pay your tax liability by April 15th. Oregon doesn't require an additional form to request an extension.

Be sure to:

• Include your Social Security number
• Specify the tax year you’re paying for
• Make sure your payment reaches the Oregon Department of Revenue by the deadline

Paying Oregon Income Taxes

Even if you take more time to file, Oregon expects you to pay your taxes on time. If you don’t pay by April 15th, interest starts accruing the next day. Late payments may also trigger penalties that increase the longer your balance remains unpaid.

Payment Options

Oregon offers several payment options:

• Online Payments: Use the Revenue Online system to submit your payment securely and instantly.
• Mail Payments: Complete and include Form OR-40-V when mailing your check or money order to the Oregon Department of Revenue.
• Payment Plans: If you can’t pay in full, apply for a payment plan through the Revenue Online portal. Interest will continue to accrue, but a payment plan can help you avoid more severe collection actions.

Estimating Your Tax Liability

If you're unsure how much you owe, it's better to overestimate than underpay. Overpayments will be refunded when you file your return, while underpaying can result in penalties.

If you fail to pay at least 90% of the tax owed by April 15th, the underpayment penalty is 5% with a minimum of $5.

Federal Tax Extension

Need more time for both your federal and Oregon returns? File IRS Form 4868 with the IRS by April 15th. Once approved, the deadline moves to October 15th.

Remember: A federal extension only covers your filing date—it doesn’t postpone your payment deadline. Oregon recognizes your federal extension automatically, but still expects payment by April 15th.

Oregon Tax Statistics

Want to get a quick peek at Oregon's tax landscape? Here's what you should know:

• Top Income Tax Rate: Oregon’s highest state income tax rate is 9.9%, one of the top rates in the U.S.
• No Sales Tax: Unlike most states, Oregon does not impose a sales tax, which often surprises new residents.
• Average Refund: The average Oregon refund is around $1,300.
• Filing Volume: The state receives over 2.2 million individual state income tax returns annually.
• Tax Revenue: Oregon collected over $11.7 billion in personal income taxes in 2022, making it the state’s largest revenue source.

Source: Oregon Department of Revenue, Research Section. Oregon Personal Income Tax Statistics; Characteristics of Filers: 2024 Edition: Tax Year 2022.

These stats highlight why filing accurately—and on time—is essential for both taxpayers and the state economy.

Source: U.S. Census Bureau, via Federal Reserve Bank of St. Louis, "State Tax Collections: Total Taxes for Oregon." Accessed June 5, 2025.

Benefits of Filing an Extension

Filing an extension gives you peace of mind and more time to:

• Gather missing tax documents
• Maximize deductions and credits
• Avoid mistakes or audits

But keep in mind, extensions are not a way to postpone your tax bill. They serve as a buffer to ensure your return is accurate and complete.

What Happens If You Don’t File or Pay?

Consequences of not filing or paying your Oregon taxes include:

• Late Payment Penalty: A 5% penalty on any unpaid tax if not paid by April 15th.
• Late Filing Penalty: An additional 20% penalty if the return is filed more than three months after the due date, including extensions.
• Interest: Interest accrues on unpaid taxes starting the day after the filing deadline. Oregon’s interest rate may change annually, so check the Oregon Department of Revenue for the most current rates.
• Note: Interest only on the tax amount, not on penalties.  

Oregon takes tax compliance seriously. Failing to file or pay can result in wage garnishment, asset liens, or damage to your credit.

Common Oregon Tax Extension Questions

What is the Oregon tax extension deadline?

The extended deadline to file your Oregon state return is October 15th.

Does Oregon require a separate extension form?

No. Oregon doesn't require a separate extension form. You only need to pay your Oregon tax liability to get an extension.

Do I still have to pay my taxes by April 15th?

Yes. Oregon grants an extension to file, not to pay. All taxes owed are due April 15 to avoid penalties and interest.

How do I make an Oregon extension payment?

You can pay online via Revenue Online or by mailing Form OR-40-V with your payment to the Oregon Department of Revenue.

What if I can’t pay my taxes in full?

You can set up a payment plan through the Oregon Department of Revenue's Revenue Online portal. While interest still applies, a payment plan can help avoid collections, wage garnishment, or liens.

Will I get penalized if I underpay?

Yes. Underpayment penalties may apply if you pay less than 90% of your tax liability by April 15th. It's advisable to pay more than your estimated tax amount to avoid penalties.

Need More Time to File?

To avoid last-minute stress, file for a federal tax extension or pay your Oregon tax liability on time to qualify for a state extension.

Need more time to prepare your federal tax return? File Your Federal Tax Extension Today