The deadline for 2020 state tax owed is usually the same as the deadline for federal tax owed (April 15, 2021). But some states have their own deadlines.
| State | Deadline |
| Alabama | 04/15/2021 |
| Alaska | N/A |
| Arizona | 04/15/2021 |
| Arkansas | 04/15/2021 |
| California | 04/15/2021 |
| Colorado | 04/15/2021 |
| Connecticut | 04/15/2021 |
| Delaware | 04/30/2021 |
| District of Columbia | 04/15/2021 |
| Florida | N/A |
| Georgia | 04/15/2021 |
| Hawaii | 04/20/2021 |
| Idaho | 04/15/2021 |
| Illinois | 04/15/2021 |
| Indiana | 04/15/2021 |
| Iowa | 04/30/2021 |
| Kansas | 04/15/2021 |
| Kentucky | 04/15/2021 |
| Louisiana | 05/15/2021 |
| Maine | 04/17/2021 |
| Maryland | 04/30/2021 (if you e-file by 04/15/2021) |
| Massachusetts | 04/15/2021 |
| Michigan | 04/15/2021 |
| Minnesota | 04/15/2021 |
| Mississippi | 04/15/2021 |
| Missouri | 04/15/2021 |
| Montana | 04/15/2021 |
| Nebraska | 04/15/2021 |
| Nevada | N/A |
| New Hampshire | N/A |
| New Jersey | 04/15/2021 |
| New Mexico | 04/30/2021 if you e-file and pay electronically, otherwise 04/15/2021 |
| New York | 04/15/2021 |
| North Carolina | 04/15/2021 |
| North Dakota | 04/15/2021 |
| Ohio | 04/15/2021 |
| Oklahoma | 04/20/2021 if you e-file and pay electronically, otherwise 04/15/2021 |
| Oregon | 04/15/2021 |
| Pennsylvania | 04/15/2021 |
| Rhode Island | 04/15/2021 |
| South Carolina | 05/01/2021 (if you e-file) or 04/15/2021 (if you mail) |
| South Dakota | N/A |
| Tennessee | N/A |
| Texas | N/A |
| Utah | 04/15/2021 |
| Vermont | 04/15/2021 |
| Virginia | 05/03/2021 |
| Washington | N/A |
| West Virginia | 04/15/2021 |
| Wisconsin | 04/15/2021 |
| Wyoming | N/A |
