Amend your 2019 tax return using the 44444 form to correct the original W2. Print the amended return and mail it with the original W2 and the W-2-C or 44444. The overpayment will be your refund from the amendment.
Save the 2021 form and use when you file your 2021 taxes.
Save the updated paystub with your other 2019 tax records.
Quickbooks will not refund your money. Only the IRS will do that.
