Report-Taxpayer-Confidentiality-2010 - U.S. Treasurey Department
History starts on p15.
Google search: federal income tax returns - confidentiality vs. public disclosure
First hit should be a Yale Law School Law Review article by Boris Bittker.
Your property tax is a public record.
Thanks for the reply. I can understand that property tax has been treated differently from income tax. But I think the Founding Fathers would feel betrayed by the government’s efforts to chip away at the 4th amendment. And it’s getting worse unless we start pushing back.