It's not too late to file your 2018 tax return. You cannot file a previous years return with the Online version, the Online version is only to file the current years tax return.
Prior year returns cannot be e-filed with TurboTax. You file your 2018 return with TurboTax you will need to use the 2018 Download software (or go to the IRS website for prior year forms). To purchase the software from TurboTax go to the following website.
https://turbotax.intuit.com/personal-taxes/past-years-products/
You can still file a 2018 tax return.
To complete and file a 2018 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2018 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2018 tax return can only be printed and mailed, it cannot be e-filed.
It's not too late to file your 2018 tax return. You cannot file a previous years return with the Online version, the Online version is only to file the current years tax return.
Prior year returns cannot be e-filed with TurboTax. You file your 2018 return with TurboTax you will need to use the 2018 Download software (or go to the IRS website for prior year forms). To purchase the software from TurboTax go to the following website.
https://turbotax.intuit.com/personal-taxes/past-years-products/