If you used a PIN to sign your return with TurboTax, you don't have to file form 8453S. You also don't need to file this form because TurboTax can file your return without it. According to the instructions on the form, an ERO can use either Form 8453-S or Form 8879-S to obtain authorization to file the corporation’s Form 1120-S.
Check to see if you signed a form 8879. TurboTax is an ERO and would not e-file a return without that authorization.
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