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My DOR and other online services will be down for maintenance from 5 p.m. PST Friday, January 17, 2025, to 8 a.m. PST Tuesday, January 21, 2025.
Oil spill tax returns
Monthly
Note: Effective March 2018, the monthly Oil spill tax return was discontinued.
| 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| December | Return | Return | Return | Return | Return | |
| November | Return | Return | Return | Return | Return | |
| October | Return | Return | Return | Return | Return | |
| September | Return | Return | Return | Return | Return | |
| August | Return | Return | Return | Return | Return | |
| July | Return | Return | Return | Return | Return | |
| June | Return | Return | Return | Return | Return | |
| May | Return | Return | Return | Return | Return | |
| April | Return | Return | Return | Return | Return | |
| March | Return | Return | Return | Return | Return | |
| February | Return | Return | Return | Return | Return | Return |
| January | Return | Return | Return | Return | Return | Return |
