I didn't submit my 2016 tax return back in 2017. How can I get back into my 2016 return so that I can submit it?
If you used TurboTax Online in 2016, you can login
to the 2016 servers and retrieve you return. Here is the url: https://2016.turbotaxonline.intuit.ca/
If you used TurboTax CD/Download you can download
the software for 2016 and use it to open you .tt16 return files. You can use
the same installation key as you did previously. Here is the download link: http://secure.intuit.ca/tax-software/download-skus/tt-basic-2016.jsp