How do i pay back my defered social security taxes from 2020?

[rjs]

The IRS has not yet provided any information about how to pay the deferred tax. The first payment is not due until December. I'm sure the IRS will provide instructions before then.

[Critter-3]

Since you know the tax was only deferred you should be adjusting your withholdings or estimates now so you don't owe too much on the return next year and owe an underpayment penalty.