TurboTax online will ask for the pre payment code just before you go to file. Here is how you will enter it.
https://turbotax.community.intuit.ca/replies/2648021
With TurboTax Online- you need to save your returns in your Online account- therefore they will not be saved on your hard drive until after you have completed your return and choose to save a PDF then the PDF will be stored on your computer.
