Van makes an investment in a partnership in 2018. Van’s capital contributions to the partnership consisted of $30,000 cash and a building with an adjusted basis of $70,000, subject to a nonrecourse liability (seller financing) of $20,000. 

a. Calculate the amount that Van has at risk in the activity immediately after making the capital contributions. 

b. If Van’s share of the loss from the partnership is $100,000 in 2018, and assuming that Van has sufficient amounts of passive income, how much of the loss may he deduct in 2018? 

c. What may be done with the nondeductible part of the loss in Part b?