I forgot to file a w2 with my return

You will have to wait. 

It will not affect the processing of your initial return.  

However, you will need to amend your 2016 return.  

Do not add the form to your return until the amendment forms are ready.  

Since you have already filed your return, you'll need to wait for your tax return to either be rejected or accepted.  

If it is accepted, you will need to amend your return to include your additional form. The amendment form will not be available until mid-February so don't change anything in your return until then. Once it is available, you will be able to prepare and print your amended return so that you can mail it to the IRS.   

Please see the following TurboTax FAQ for instructions on how to amend your 2016 tax return in TurboTax or sign up for updates when it is released.  

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