Your tax return is the form you send to the IRS that shows your income and calculates your tax. The money that the IRS sends back to you is your refund.
Are you asking about your tax return being mailed to the IRS, or your refund being mailed to you? If you are asking about your tax return being mailed to the IRS, it only gets mailed if you mail it yourself. TurboTax does not mail your tax return to the IRS for you.
