My recommendation would be to create the 2019 tax return first. Because electronic filing is not available for prior year returns, the 2019 return will need to be filed by mail. The advantage to completing the 2019 return first is to be sure that there are no carryover items (such as capital losses, unused home office expense, etc.) that could affect the 2020 tax return.
Then, you can work on your 2020 tax return and it can be electronically filed.
Using TurboTax, you will need to purchase and download one of the installed versions of the program in order to file the 2019 return. You may want to consider using a CD/downloaded version of TurboTax for your 2020 return as well. Once the 2019 return is completed and saved on your computer, the 2020 program can import the 2019 file to give you a head start and bring in any carryover items. You can still electronically file the 2020 return from the installed version of TurboTax.
Also, the only reason you would need to be concerned about when you file each return would be if there were items carried forward from 2019 to 2020. If that is the case, it may be better to mail the 2019 first and give it time to be processed before submitting the 2020 return.
@Emc1122
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