Originally Posted by Ron Bennett

Probably for similar reasons to why the IRS doesn't offer free filing directly even though they could, and would love to, implement it right now... But legally the IRS can't due to intense lobbying by tax preparation firms - instead one, assuming the person qualifies for free filing (most do), must go through one of numerous "approved" private tax filing companies, such as H&R Block, etc.

The U.S. Postal Service is, regardless of the rhetoric / spin, is most certainly a government agency, but is supposed to be financially self-sufficient.

For those with the notion that the U.S. Postal Service is private, consider the pay-scale they use - looks very governmental, because it is. And here's another one ... UPS and FedEx vehicles get ticketed all the time for parking violations and yet U.S. Postal Service vehicles, which typically aren't even registered / have no license plates, are exempt.