According to the IRS, there are several important dates taxpayers should keep in mind for this year's filing season:

April 18: Due date to file 2021 tax return or request extension and pay tax owed due to Emancipation Day holiday in Washington, D.C., even for those who live outside the area.

April 19: Due date to file 2021 tax return or request extension and pay tax owed for those who live in Massachusetts or Maine due to Patriots' Day holiday.

October 17: Due date to file for those requesting an extension on their 2021 tax returns.