As a shareholder in an S corporation, you should be maintaining a schedule of your basis in this investment. If you have not been maintaining this, then you do not have the necessary information to determine your final gain or loss.
See the attached IRS link to provide some guidance here:
https://www.irs.gov/businesses/small-businesses-self-employed/s-corporation-stock-and-debt-basis
Once you determine your basis you will input your ending basis figure where you currently have the $1,000. Because all items of income and loss pass through to the shareholder, it is doubtful that your original contribution amount is your ending basis.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
