Questions: It looks like this should be done via IRS Form 7203, but that only came out in 2021, so it wouldn't be available in TurboTax Premier 2020? For 2019,
my former tax preparer used "Form 1040 Shareholder's Basis Worksheet Page 1" and "Page 2", and "Schedule E K-1 Reconciliation Worksheet - Qualified Business Income" to show basis - where do I find these forms in TurboTax or on the IRS website?
Since I will be printing and mailing in my return, am I allowed to download these additional forms from IRS website and fill them out and include them with my return?
The basis worksheets prepared by your former accountant were most likely prepared by the software used to prepare the S-Corp return and are not available at the IRS website or TurboTax but may be available on the internet.
I would suggest you either use the form 7203
https://www.irs.gov/pub/irs-pdf/f7203.pdf
or create a spreadsheet in the format like what the preparer gave you.
