https://www.mercurynews.com/2021/05/17/u-s-tax-day-arrives-late-with-irs-behind-on-millions-of-returns/

Monday brings a close to what tax advisers have dubbed the “never-ending tax season,” with the IRS scrambling to cope with repeated changes in law that offered just a foretaste of the challenges to come — with President Joe Biden pressing for a raft of higher levies and stepped-up audits.

Since the start of the pandemic, Congress authorized three rounds of stimulus checks, temporary expansions to tax credits and deductions, and repeated rule changes on the treatment of loans sent to small businesses. Special unemployment benefits were also distributed, with lawmakers later revising their tax treatment.