. >> i'd like to get to jack mitnik in just a moment who you lean on in this reporting in a moment. >> yes. >> first, explain to us the provision. it's early in the morning, so as plainly as possible this net operating loss that would allow donald trump to claim a loss of 916 million and then not pay federal taxes for the next 18 years. >> yeah. it's pretty crazy, but there is a provision in the tax code when you fill out your taxes if you have business deductions, you can list them and over time if you rack up losses on the net operating losses you can continue to move them forward to reduce your taxes -- essentially reducing your taxes in future years and also back three. it allows you to reduce your taxable income to zero which means you don't have taxes to pay in those years and you can move it forward. you can move it forward 15 years. in addition he could have racked up additional operating losses that he could have rolled forward. we know from 1995 15 years he potentially didn't pay taxes but it could be further depending on numbers in future years. >> let's talk about jack mit

. >> let's now talk about jack mitnik, 80 years old now. donald trump's former accountant. trump refers to him in the art of the deal. he explains trump's understanding as the critical role taxes would play in helping him, trump, build wealth. what did you learn from mr. mitnick? >> just incredibly the idea that donald trump in the early 1990s, late 80s, when these losses were probably at their largest, businesses were going under. his businesses were failing. creditors were being left with pennies on the dollars. those losses are what enabled him to not pay taxes going forward. >> these are three pages. the first page of the new york residence filing, the new jersey and connecticut nonresident filings. there are still some questions unanswered though. >> there are. we have three pages which gives us a lot of information, but we don't have the schedules that went with that to itemize the losses, we don't have a full view of his charitable contributions and we know he checked off boxes saying he didn't want to give to a number of charities but we don't know exactly what that