OR-20-S: Form OR-20-S, Oregon S Corporation Tax Return (2025)
Oregon · Oregon DOR · Used for tax years 2025
Form OR-20-S is the 2025 Oregon S Corporation Tax Return for excise or income tax. It reports business information, Oregon sales, taxable income, and tax, including calculations for built-in gains and excess net passive income.
What you'll need
Include a complete copy of your federal Form 1120-S and its schedules, including all federal K-1s or a K-1 summary.
Depending on the entries on your return, also include:
- Schedule OR-AP if you apportion income.
- A schedule for any prior-year C corporation net loss claimed on line 5.
- Schedule OR-FCG-20 for an adjustment on line 9.
- A schedule for installment sales interest on line 13.
- Form OR-37 for interest on underpayment of estimated tax on line 24.
- Schedules for other additions or subtractions reported on Schedule SM.
Have your corporation’s FEIN, business and contact information, and payment records ready. Schedule ES asks for payment amounts, dates, payer names, and payer FEINs.
How to file
Complete the return using UPPERCASE letters and blue or black ink. Print it at actual size (100%). The return includes an officer signature and date field.
Refund returns and no tax due returns: Mail to:
Refund
PO Box 14777
Salem OR 97309-0960
Tax-to-pay returns: Mail the return with payment to:
Oregon Department of Revenue
PO Box 14790
Salem OR 97309-0470
Do not include a payment voucher with your return. Include the complete federal Form 1120-S and schedules, including all federal K-1s or a K-1 summary. Do not submit photocopies or use staples.
Common mistakes
- Incorrect formatting: Use UPPERCASE letters, blue or black ink, and actual-size printing (100%). Do not submit photocopies or use staples.
- Completing questions A through C unnecessarily: Complete these only for your first return or if an answer changed during the tax year.
- Missing Schedule OR-AP: You must attach it if you apportion income.
- Using the wrong codes on Schedule SM: Identify the federal Schedule K-1 line item for each modification. Do not use Schedule OR-ASC-CORP codes in this section.
- Leaving out extension payments: Include payments made with an extension in Schedule ES and the total carried to line 19.
- Including a payment voucher: The form says not to include one with the return.
- Missing federal attachments: Include a complete federal Form 1120-S and schedules, including all federal K-1s or a K-1 summary.
Questions people ask
What if the S corporation has no built-in gains or excess net passive income?
Enter the apportionment percentage on line 6, enter zero on lines 7, 8, and 10, and go to line 11.
What should I enter on line 6 if I do not apportion income?
Enter 100.0000. If you do apportion income, use the percentage from Schedule OR-AP, part 1, line 23, and attach that schedule.
Can I apply a refund to estimated taxes?
Line 28 lets you enter the amount of your available refund to credit to your open estimated tax account. Line 29 is the net refund after subtracting that amount.
Where do I report payments made with an extension?
Report extension payments or other prepayments for this tax year on Schedule ES, line 6. Carry total prepayments from Schedule ES, line 8, to the return’s line 19.