Is it too late to add to my tax return after it is submitted?

[bluedeb · Accepted solution]

Yes, if your return has been accepted you would have to amend your return to add or change information.  Amended returns must be mailed.  The IRS suggests you wait until your original return has been completely processed.

How do I amend a 2016 return in TurboTax?

 https://ttlc.intuit.com/replies/5114064        

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You can track your amended taxes with the IRS tracking tool. It takes the IRS around 16 weeks to process your amended taxes.