If you already filed your returns and they were accepted, you will need to file an amended return W-2 you got after you filed. The
1040X for amending 2015 returns will not be available until February 11th.
You should not try to amend your return until 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.
If you filed your returns are they were rejected you are able to login back into your account and add the additional W-2, fix the errors that caused the rejection and re-file your returns.
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