Generally, there is nothing you need to mail in with a
Schedule C, if you intend to e-file. If you intend to print your return and
mail it, in the Print Center, select that you want to print the forms filed with the government.
Those are the forms that you’ll need to mail.
You'll need to retain any documentation you have to establish your income and expenses in case you are ever questioned by the IRS, but you don't have to send anything in with your return.