From the way you've described the transaction this probably should have been reported as an installment sale in 2015 or, alternatively at your election, as a 2015 sale for all the proceeds. So the "most proper" advice would be to amend your 2015 income tax return and then prepare your 2016 income tax return accordingly.
The "practical" advice that I know many would give, (in the "you probably can get away with it" mode), would be to report the $14K as proceeds against a $0 basis, assuming you reported all your basis in 2015. You use the "Stocks, Mutual Funds, Bonds, Other" interview and tell TurboTax you DID NOT get a 1099-B.
Tom Young
