The deductible losses of an S-corporation shareholder are limited to shareholder’s
basis in the stock plus any loans the shareholder made to the corporation. To illustrate this look at the
following example:
Two investors A and B each invest $ 100,000 and form an S-corporation. Now the S-corporation borrows an additional $ 200,000.
If for some reason the S-corporation fails, then the deductible loss for inventors A and B is $ 100,000 each and not 200,000 each.
In an S-corporation this situation will occur even if the investors A and B guaranteed the loan. This is an important consideration
for investors specially if the business is going to be financed by a loan.