As many as 100,000 Oregonians are expected to submit state income tax returns during the final two weeks before the October 15 extension deadline, completing a filing season that includes distribution of a $1.41 billion revenue surplus through Oregon’s kicker credit.
More than 2.1 million taxpayers have already filed their 2025 Oregon personal income tax returns, according to the Department of Revenue’s October 1 reminder. The anticipated additional filings represent the department’s estimate of returns arriving before the deadline, rather than a count of taxpayers who have failed to meet their obligations.
Thursday, October 15, is the standard extended deadline for 2025 individual income tax returns. Oregon accepts a timely federal extension submitted through Form 4868, allowing qualifying taxpayers to file their state returns without requesting a separate Oregon extension. Those taxpayers must identify the extension on their Oregon return.
The additional filing time did not postpone payment. For most taxpayers, state and federal taxes owed for 2025 were due April 15, 2026. Unpaid balances can accumulate interest and penalties even when a taxpayer obtained a valid filing extension.
Oregon assesses a 5 percent late-payment penalty on tax unpaid by the original deadline. A separate 20 percent late-filing penalty applies when a return arrives more than three months after its applicable deadline, including extensions. When both penalties apply, they total 25 percent of unpaid tax. The state’s annual interest rate is 8 percent for interest periods beginning January 1, 2026, with additional interest possible on assessed balances that remain unpaid.
Eligible taxpayers can claim a kicker equal to 9.863 percent of their qualifying 2024 Oregon tax liability. A taxpayer with qualifying liability of $2,000 would receive a $197.26 credit, reducing taxes owed or increasing a refund.
Eligibility requires a filed 2024 Oregon return, Oregon tax liability for that year and a filed 2025 Oregon return. Residents who otherwise have no filing requirement must still submit a 2025 return to receive an eligible kicker.
Free electronic filing remains available through Direct File Oregon for supported full-year resident returns. The program does not support part-year or nonresident returns. Federal IRS Direct File is closed for this filing season, although taxpayers can manually enter federal return information into Oregon’s system. IRS Free File options remain available through October 15.
Southern Oregon residents can access public filing computers at the Revenue Department’s Medford office. An outside drop box accepts paper Oregon returns. For mailed returns approaching the deadline, the department recommends requesting a manual postmark at a Postal Service counter by October 15. Federal paper returns should be mailed directly to the IRS.
Taxpayers unable to pay in full can seek separate state and federal payment arrangements. Oregon offers plans of up to 36 months through Revenue Online, with financial documentation required for longer arrangements.
Refund security also remains part of state tax administration. The governor’s office reported in March that Oregon blocked $1.995 billion in attempted refund fraud over five years. Consumers can report suspected scams to the Oregon Department of Justice at 877-877-9392.