The US operates as a tax haven, along with Jersey, the Cayman Islands,
Luxembourg, and Switzerland. This article explains
how
tax havens work and how they give multinational companies an
advantage over local competition.
I disagree with the rhetorical trick that occupies the first part of
the article: buying from a company that uses tax havens is not morally
equivalent to using a tax haven yourself.
Nonetheless, I have very little dealings with the multinational
tax-haven-using companies mentioned as examples. Some I reject for
other reasons (Apple, Amazon, Skype, most Google services, Microsoft,
Facebook, big banks), while others sell things I don't need.
UK plans to block use of tax havens were
watered
down so as not to cover Luxembourg, Jersey or Switzerland.
Even worse, the plan creates a new tax-dodging scheme.
The UK government demands that EU countries
compete
to tax businesses less.