Once you have mailed your returns or e-filed your returns it's too late to stop them.
However, if you know that corrections are needed, you can amend your return.
Wait for your return to be
processed by the IRS before amending.
See FAQ below
to Amend 2016 Online:
https://ttlc.intuit.com/replies/5567856
See FAQ below
to Amend 2016 in Desktop:
https://ttlc.intuit.com/replies/5114143
