@moha0514 Upon re-reading your original question, it's not completely clear what you mean. You never said what tax year software you are wanting to purchase. And by "upload previous years taxes" were you asking about transferring multiple years, or just the immediate prior year?
You cannot transfer multiple previous years data. You can only transfer-in the data file from the immediate prior year. For example, if you purchase 2018 TurboTax software, you can only transfer-in a *.tax2017 data file. If you purchase 2017 TurboTax, it will only transfer-in a *.tax2016 data file. 2016 TurboTax can only transfer-in a *.tax2015 data file, and so on.
