@bcbkakljdasdas - and these adjustments would occur on your 2022 tax return next year. You can not amend the 2021 tax return to reflect this situation.
were you asked to pay 100% of the gross amount or 100% of the gross amount less social security and Medicare tax? The federal and state withholdings would come back to you via the 2022 tax return as discussed by @Mike9241 , but SS and Medicare should come back from the employer (i.e. netted from what you are paying them back)
