Here is so more information:
Typically, if you don't pay any tax you owe by the tax filing deadline — July 15— the IRS will charge you a penalty and interest on your outstanding balance. ... Deferment is just postponement; barring any additional government relief, you'll have to pay your balance when the deferment period is up.
[edited 3/25/20]
https://blog.turbotax.intuit.com/tax-news/is-the-tax-deadline-delayed-what-to-know-about-coronavirus...
