The answer provided by @VolvoGirl gives excellent information on how to find the tax data file on your computer. The tax data file is used to transfer the 2019 tax data to the 2020 tax return. The procedure is true for both the personal TurboTax editions and the Business Edition.
By default the tax data file is in the TurboTax folder in the Documents directory. If the 2019 tax data file is not in the TurboTax folder, then do a hard drive search for .tax2019
