TurboTax Online & TurboTax CD/Download are two different pieces of software. TurboTax Online doesn’t require any downloads, as it runs in your web browser. TurboTax CD/Download requires you to download and install the software onto a Windows based computer. Either way, you must pay per year, as each year only has the forms/info for the one year.   The 2015 TurboTax Online service has been discontinued, so only TurboTax CD/Download is available for that year. For subsequent years you can use TurboTax Online or TurboTax CD/Download.   To see what we have available for previous tax years, please see this website: https://turbotax.intuit.ca/tax-software/prior-year-taxes.jsp You can compare the different versions of TurboTax Online 2018 here: https://turbotax.intuit.ca/personal-tax-software/online-tax-software.jsp You can compare the different versions of TurboTax CD/Download 2018: https://turbotax.intuit.ca/personal-tax-software/download-tax-software.jsp If you have an iOS or Android device, you can use our new app for 2018: https://turbotax.intuit.ca/personal-tax-software/mobile-2018.jsp ... View more