Sure, right now it looks like he did it legally. But give it time...
And I say this due to his reaction when questioned about it. He feels that working his way around paying taxes is "smart" and that he doesn't 'like how the government spends tax dollars', almost as if that was his reason for not doing so. That right there tells me that he intentionally found a loop hole and altered his info to make it work to his benefit. In other words, created a (false) loss on paper that would enable him to skip the bill...very Trump.
It's all in his words. You just need to listen. Maybe I'm wrong, but we will watch, wait, and see.