After you file

@HeatherPLO 

Thank you for your kind reply.

* So the 3rd party gets involved only if I select "Pay with my Return", correct?

Therefore, if I purchased the TurboTax Premier desktop version (which included a free Fed filing) and if my return didn't require any additional forms to be purchased, the 3rd party service would not be involved, correct? (because there is nothing for me to pay).

TIA