If you have your 2019 tax return and the TurboTax 2019 program installed on your computer, you could create the amended return in the 2019 software in order to match the changes that were made by HRBlock. Or, instead of creating the amended return, just make the same changes or corrections and save the tax data file for 2019.
Then, use that corrected 2019 tax data file as the starting point for your 2020 tax return. If you use the CD/downloaded version of TurboTax for 2020, you can choose which tax file to import into the 2020 program to get started.
You should not need to do anything to account for the 2017 and 2018 amended returns. If there was anything changed that carried forward, those changes will be accounted for on the 2019 amended return.
@gsu13
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