So you have a number of things going on:
- You need to wait until you receive your final K-1 for 2016. This may mean you will need to file an extension to file your return.
- You also should have been maintaining a basis schedule of your investment in the S corporation.
- Until you receive your final K-1 and update your basis schedule for this activity you cannot determine your overall gain or loss on this investment.
- Your basis at this point is not the $25,000 you initially contributed as you received K-1's over the years that impact your basis. As noted in bullet #3, you cannot determine your gain or loss until you have an accurate basis schedule.https://www.irs.gov/businesses/small-businesses-self-employed/s-corporation-stock-and-debt-basis
- Once you have determined your basis in the S corporation and updated it for the final K-1 you will then report your gain or loss on Schedule D and the applicable form 8949.
*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.
