IRS Delays Tax Payment Deadline by 90 Days for Most Individuals and Businesses By Hahn Loeser Construction Team on March 18, 2020 Email this postTweet this postLike this postShare this post on LinkedIn UPDATE: An IRS notice published on March 18, 2020, clarified several aspects of the 90-day tax deferral announced one day earlier by Treasury Secretary Steven Mnuchin. Read the full article here.