I'm not clear why you are not using your initial investment as the purchase price and the final distribution as the sales price. It can (in my experience) feel ...
The start date is the date you invested, and end date is the date the partnership sold the investment. Purchase price, yes, your investment amount. The sale pri...
I would just add that, although yes the final K-1 will show gain/losses from disposal of the investment, you still need to figure your actual gain/loss yourself...