You may have to amend your tax return to remove a dependent. The amendment may take at least 11-12 weeks to process.
If your return is e-filed but pending - please wait. If it
is rejected for some reason, you can remove your dependent then and re e-file.
If the return has been e-filed and accepted, you can only
make the change by amending your tax return. The 1040X for amending 2015
returns will not be available until mid-February. 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.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
