Why should he, other than to satisfy busy bodies and opposition research people who want to make an issue of this line or that.
It's nobody's business as long as he filed them.
When you are in business it's not as simple a return as a one W-2 with a house filing. I am surprised the Watertown media hasn't demanded tax returns. It would be good for ratings as people are nosy.
Trump won’t release tax returns before election | TheHill