From an editorial Friday in the Washington Post:
Donald Trump has spent a lot of time and effort branding himself as a great philanthropist. It seems he has put less effort into actually giving his own money away. The discrepancy provides one more reason that Trump should release his tax returns.
Unlike every other major presidential candidate in modern times, he has declined to release them. Theories abound as to why. One is that they would show that he does not make as much money as he boasts. Another is that he might pay little or nothing in taxes. Yet another is that Trump simply is not generous, despite his assurances otherwise.
Candidates are expected to release their tax returns for a good reason. The full documents give the public a sense of presidential candidates’ personal financial dealings – how they conduct themselves and the relationships they have built outside of their responsibilities in public office.
Since Trump has never held public office and campaigns on the fact that he is unusually competent in his financial life, it is all the more important that the public have hard data with which to assess his grandiloquent claims.
That should start with his tax returns and include information on the performance of his closely held private businesses, to prove that his statements about their success are more than bluster.
Voters can review Hillary Clinton’s tax information going back decades. By contrast, Trump thus far has offered nothing but flimsy excuses.