Yes, you will owe the IRS the deferral amount. There was no forgiveness of these taxes. You were simply allowed to defer the amount due to a later date. For employees, you will be required to repay all of the deferred amounts by January 1, 2022. For employers, half of your deferred taxes will be due on January 3, 2022. The other half will be due on January 3, 2023. Failure to repay these taxes will result in penalties and interest accruing. You could get into big trouble with the IRS if the amounts are not repaid.