Deductions & credits

You are correct, 150K-160K balloon payment can happen any time in the next 5 years.

I've put the numbers in as you directed, see image.  Still not sure how 50K down payment is represented.  Also, not sure how Gross Profit percentage (.7714) works?  I figured cost basis and closing cost all got eaten up by 50K down payment so that all future cap gains from installments would be undreduced?

Thanks for your help.