After you file

Well if you haven't saved a PDF of your return yet now is a good time to do so ... then you will have that number 

 

TurboTax's instructions for printing and accessing current and prior returns are

·       For on-line returns, presented here https://ttlc.intuit.com/questions/1900748

·       For download/cd prepared returns here https://ttlc.intuit.com/questions/1900639