You cannot use the current online product to file a 2018 tax return. You must buy, download, and install on your computer the 2018 program to prepare and file a 2018 tax return. See this: https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2018 return cannot be efiled. You must print and mail it yourself. TurboTax does not print and mail it for you. Use the filing instructions that are printed with your return to know what to include and where to mail it.
