Jan. 4, 2021 UPDATE: Period extended for collecting deferred 2020 Social Security taxes The Consolidated Appropriations Act, 2021 was passed and extended the period for collecting deferred 2020 Social Security taxes. The period for collection is now Jan. 1, 2021, through Dec. 31, 2021, (instead of Jan. 1, 2021 to April 30, 2021).