Since this is a brand new form for 2021 and your basis was not required to be reported to the IRS prior to this year, there's no true historical record in any software. TurboTax Online brings up the form in the interview process so you can complete the form as you need with the additional information from your personal tracking. Any carryovers should report all that are still outstanding and yet to be claimed as a loss.
See S Corporation Stock and Debt Basis and Instructions Form 7203 for more specific information on completing the form.
@GeneMiller
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