The deadline for 2020 state tax owed is usually the same as the deadline for federal tax owed (May 17, 2021). But some states have their own deadlines.
| State | Deadline |
| Alabama | 04/15/2021 |
| Alaska | N/A |
| Arizona | 05/17/2021 |
| Arkansas | 05/17/2021 |
| California | 05/17/2021 |
| Colorado | 05/17/2021 |
| Connecticut | 05/17/2021 |
| Delaware | 05/17/2021 |
| District of Columbia | 05/17/2021 |
| Florida | N/A |
| Georgia | 05/17/2021 |
| Hawaii | 04/20/2021 More Info |
| Idaho | 05/17/2021 |
| Illinois | 05/17/2021 |
| Indiana | 05/17/2021 |
| Iowa | 06/01/2021 |
| Kansas | 05/17/2021 |
| Kentucky | 05/17/2021 |
| Louisiana | 06/15/2021 |
| Maine | 05/17/2021 |
| Maryland | 07/15/2021 |
| Massachusetts | 05/17/2021 |
| Michigan | 05/17/2021 (Note: this date may not apply to Michigan city returns, contact your city for the city due date) |
| Minnesota | 05/17/2021 |
| Mississippi | 05/17/2021 |
| Missouri | 05/17/2021 |
| Montana | 05/17/2021 |
| Nebraska | 05/17/2021 |
| Nevada | N/A |
| New Hampshire | N/A |
| New Jersey | 05/17/2021 |
| New Mexico | 05/17/2021 |
| New York | 05/17/2021 |
| North Carolina | 05/17/2021 |
| North Dakota | 05/17/2021 |
| Ohio | 05/17/2021 |
| Oklahoma | 06/21/2021 if you e-file and pay electronically, otherwise 06/15/2021 |
| Oregon | 05/17/2021 |
| Pennsylvania | 05/17/2021 |
| Rhode Island | 05/17/2021 |
| South Carolina | 05/17/2021 |
| South Dakota | N/A |
| Tennessee | N/A |
| Texas | N/A |
| Utah | 05/17/2021 |
| Vermont | 05/17/2021 |
| Virginia | 05/17/2021 |
| Washington | N/A |
| West Virginia | 05/17/2021 |
| Wisconsin | 05/17/2021 |
| Wyoming | N/A |