Yes, you will need to file an amended return to report the changes in the social security tax withheld, which could possibly change the amount of taxes you owe, or you might have overpaid. If you already filed your return you will need
to wait to see if it was rejected or accepted. If they were rejected you are
able to login to your return add the missing W-2, fix the errors that caused
the rejection and refile the return. If your returns were accepted, then you
will need to file an amended return. You should not try to amend your return until the
original return it has been fully processed and you have received your refund
or your payment has cleared.
Amended returns do not “catch up” to your original return and replace them;
they are processed as two separate returns.
Amended returns have to be printed and filed by mail. It can take the IRS
up to 12 weeks or longer to process them. If you are due a larger refund
than on your original return, your amended return should only show the
difference and you will receive a separate check for it. If you owe money
on your amended return, it will show only the new amount owed, you will have to
mail a check with the return. Click here for amending instructions: https://ttlc.intuit.com/replies/3288565
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