I spoke to Turbotax support today and they confirmed that the posted information by turbotax is FALSE : https://ttlc.intuit.com/community/after-you-file/amend-your-return/08?product=TurboTax%20Online
You CANNOT efile an amended return.
Also when you amend and put a date to submit, it comes back with an error that the date is not in 2020. So then you need to put another date in 2020 to get around that error.
Bottom line - amending a return in turbotax 2019 is FULL of errors. Since not that many people amend returns, it means it is low in priority to fix.
The reason I am amending a return is because of a bug in turbotax 2018 that they did not fix until after April 15, 2019 filing date. Running turbotax 2018 with the updates changed the return, which of course was too late to be input into 2019 return. Which leads me to this recommendation: before you import your 2019 tax return into turbotax 2020, run turbotax 2019 and get the updates, then check to make sure that the tax hasnt changed and then import the most recent file into 2020. That way you get the most correct info into your tax return.
