I think if Trump's 900 million dollar loss has lasted 18 years
you have misunderstood the article and situation
if he has a loss, then he can look backward for 3 years and use the losses against gains in those years and/or (i don;t recall if it can go both ways or only one way and i am not going to look it up as i did not have a $1B loss last year) he can look forward for 15 years etc
the article says he "could have" avoided paying taxes for as much as 18 years ... IOW you have to see the returns to know how the losses were applied and for how long etc
