NOTE - this is the filing day, not just the payment day - which is a notably positive shift.
Mr. Mnuchin told reporters following testimony on Capitol Hill:
"That will have the impact of putting over $200 billion back into the economy, and that will create a very big stimulus."
On March 17, US Treasury Secretary Steven Mnuchin announced in a press conference that the payment due date has been delayed by 90 days (to July 15) for individual taxpayers. This applies to federal tax up to $1 million owed with tax returns. No interest or penalties apply until after July 15.
This announcement was followed by IRS Notice 2020-17, issued on March 18.
Now the tax-return filing deadline has also been delayed to July 15.