Elim Garak
Veteran
You can begin filing taxes on January 27th. 
IRS opens 2020 filing season for individual filers on Jan. 27 | Internal Revenue Service

The Internal Revenue Service confirmed that the nation's tax season will start for individual tax return filers on Monday, January 27, 2020, when the tax agency will begin accepting and processing 2019 tax year returns.
IRS opens 2020 filing season for individual filers on Jan. 27 | Internal Revenue Service