There is nothing that you need to do in most cases to pay back your taxes. Your employer should automatically withhold the proper amounts from your paycheck to pay back the taxes that you owe. This should have already taken place, as payback of the deferrals for employees was due on January 1, 2022. You should have noticed during 2021 that the amount of your Social Security withholdings doubled during the first few months of the year. This was because your employer was withholding the deferred amounts from your check to repay the IRS.