What to do if I didn't file my 2017 taxes and now my 2018 taxes are being rejected?

[mesquitebean]

What is the reason for the 2018 rejection?    If the 2018 efile was rejected because of 2017 AGI, then you should enter an AGI of 0 (zero).    If you didn't file a 2017 return, there is no 2017 AGI for you in the IRS database.

[taliahermesh]

I didn't file a 2017 return. So what do I do??

[mesquitebean]

What do you do in regard to "what???"    Your original question was about your 2018 return, and I told you how to correct the 2018 efile rejection by using a 2017 AGI of 0 (zero.)   Are you now asking how to file a 2017 return?   If so, we can tell you how to do that using the 2017 desktop software.   A 2017 return cannot be prepared in Online TurboTax.

We can tell you what to do when you state specifically what you need to know.

[mesquitebean]

A 2017 return cannot be prepared in Online TurboTax, which is now only for 2018.

To prepare a 2017 return would require desktop software (CD/download).   However, I see you are using a Mac computer to ask this question, and that your OS X version is 10.10.5.   You cannot install the 2017 desktop software on that software version.    You would need to have  OS X 10.11 or  higher.

Mac system requirements:
<a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1899173-minimum-system-requirements-for-turbotax-mac-software">htt...>

Or did you already start a 2017 Online return last year?  If so, was it finished and ready to file?  If so, you may be able to download the PDF, print it out, sign, date, and mail.    If it needs any changes, however, you would have to do it with 2017 desktop software, and your computer OS X version won't allow it.    Or do you have another computer, such as a PC or a Mac with a higher OS X version?