If you
have already
e-filed your return then it is too
late. Once you transmit your return you cannot change it or get it
back. You would have to wait until your return gets rejected or
accepted. If rejected, you can make your changes or add information
to your return. If accepted, you would need to amend your return to
correct or add information to your return.
The IRS only verifies the first five letters of your last name, with your social security number, so If the first five letters were correct then it may be accepted. If it is rejected then you can go back in and correct this information. If your return is Accepted then you can Amend your return so that it shows the correct first name.
TurboTax 2015 Amendment forms will not be available until February 11, 2016. Please refer to the TurboTax FAQ below for additional information regarding amending a return:
More
information regarding amending a return can be found below:
https://ttlc.intuit.com/replies/3288565
