Federal, Oregon & Portland-area deadlines · Calendar-year taxpayers only · Last updated May 2026
| Taxpayer / Filing type | Form | 2026 due (2025 tax yr) | 2026 extended | 2027 due (2026 tax yr) | 2027 extended |
|---|---|---|---|---|---|
| Partnerships & multi-member LLCs | Form 1065 | Mar 16, 2026 | Sep 15, 2026 | Mar 15, 2027 | Sep 15, 2027 |
| S corporations | Form 1120-S | Mar 16, 2026 | Sep 15, 2026 | Mar 15, 2027 | Sep 15, 2027 |
| C corporations | Form 1120 | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| Individual income tax | Form 1040 | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| Tax year | Individuals | C corporations |
|---|---|---|
| 2026 tax year |
Apr 15, 2026Jun 15, 2026Sep 15, 2026Jan 15, 2027
|
Apr 15, 2026Jun 15, 2026Sep 15, 2026Dec 15, 2026
|
| 2027 tax year |
Apr 15, 2027Jun 15, 2027Sep 15, 2027Jan 18, 2028
|
Apr 15, 2027Jun 15, 2027Sep 15, 2027Dec 15, 2027
|
| Taxpayer / Filing type | Form | 2026 due | 2026 extended | 2027 due | 2027 extended |
|---|---|---|---|---|---|
| Partnerships & multi-member LLCs | OR-65 | Mar 16, 2026 | Sep 15, 2026 | Mar 15, 2027 | Sep 15, 2027 |
| S corporations | OR-20-S | Mar 16, 2026 | Sep 15, 2026 | Mar 15, 2027 | Sep 15, 2027 |
| C corporations | OR-20 | May 15, 2026 | Nov 16, 2026 | May 17, 2027 | Nov 15, 2027 |
| Individual income tax | OR-40 / OR-40-N / OR-40-P | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
⚠ Oregon C corp returns are generally due one month after the federal C corp return due date.
| Tax year | Individual estimated payments | Corporation estimated payments |
|---|---|---|
| 2026 tax year | Apr 15Jun 15Sep 15Jan 15, 2027 |
Apr 15Jun 15Sep 15Dec 15, 2026 |
| 2027 tax year | Apr 15Jun 15Sep 15Jan 18, 2028 |
Apr 15Jun 15Sep 15Dec 15, 2027 |
| Filing / Payment type | 2026 due | 2026 extended | 2027 due | 2027 extended |
|---|---|---|---|---|
| OR-21 return & election | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| PTE-E tax payment | Apr 15, 2026 | ✕ No extension to pay | Apr 15, 2027 | ✕ No extension to pay |
| Tax year | PTE-E estimated payment due dates |
|---|---|
| 2026 tax year | Apr 15, 2026Jun 15, 2026Sep 15, 2026Jan 15, 2027 |
| 2027 tax year | Apr 15, 2027Jun 15, 2027Sep 15, 2027Jan 18, 2028 |
| Filing / Payment type | 2026 due | 2026 extended | 2027 due | 2027 extended |
|---|---|---|---|---|
| Oregon CAT annual return | Apr 15, 2026 | Nov 16, 2026 | Apr 15, 2027 | Nov 15, 2027 |
CAT estimated payments due on the last day of the 4th, 7th & 10th months of the tax year, and the last day of the first month following year-end.
| Tax year | CAT estimated payment due dates |
|---|---|
| 2026 tax year | Apr 30, 2026Jul 31, 2026Nov 2, 2026Feb 1, 2027 |
| 2027 tax year | Apr 30, 2027Aug 2, 2027Nov 1, 2027Jan 31, 2028 |
| Tax | 2026 due | 2026 extended | 2027 due | 2027 extended |
|---|---|---|---|---|
| City of Portland Business License Tax | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| Multnomah County Business Income Tax | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| Metro SHS Business Income Tax | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| Tax year | Business estimated payment due dates |
|---|---|
| 2026 tax year | Apr 15, 2026Jun 15, 2026Sep 15, 2026Dec 15, 2026 |
| 2027 tax year | Apr 15, 2027Jun 15, 2027Sep 15, 2027Dec 15, 2027 |
| Tax | 2026 due | 2026 extended | 2027 due | 2027 extended |
|---|---|---|---|---|
| Metro SHS Personal Income Tax | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| Multnomah County PFA Personal Income Tax | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |
| Tax year | Personal estimated payment due dates |
|---|---|
| 2026 tax year | Apr 15, 2026Jun 15, 2026Sep 15, 2026Jan 15, 2027 |
| 2027 tax year | Apr 15, 2027Jun 15, 2027Sep 15, 2027Jan 18, 2028 |
| Tax | 2026 due (2025 tax yr) | Extension? | 2027 due (2026 tax yr) | Extension? |
|---|---|---|---|---|
| Portland Arts Tax | Apr 15, 2026 | ✕ No | Apr 15, 2027 | ✕ No |
Self-employment tax only — does not cover employer payroll tax. Generally due same day as federal and Oregon individual income tax returns.
| Tax | 2026 due | 2026 extended | 2027 due | 2027 extended |
|---|---|---|---|---|
| TriMet Self-Employment Tax | Apr 15, 2026 | Oct 15, 2026 | Apr 15, 2027 | Oct 15, 2027 |