The basis reported on Schedule K-1 is the "inside basis" of the shareholder, which may not be the same for the shareholder's "outside" basis due to transactions and income/expense allocations that may be specific to that shareholder's investment in the corporation.
The fact that a shareholder receives a K-1 reflecting a loss does not mean that the shareholder is automatically entitled to claim the loss. Because it is not the corporation's responsibility to track a shareholder's stock and debt basis, it's important that the shareholder computes their "outside" basis each year, as this determines the amount of potential tax loss that can be reported.
The link below provides the rules for calculating a shareholder's basis and and examples of how to apply those rules in various situations.
Unfortunately, we are not able to make those calculations for you.
Additional info:
IRS S Corporation Stock and Debt Basis
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