Analysis of information sources in references of the Wikipedia article "Poll tax" in English language version.
The head tax approved on Monday is not the first. Denver has enacted a similar tax, and Chicago had one but repealed it. Seattle itself had a head tax in effect from 2006 to 2009
The head tax is the largest in U.S. history
A new proposal to Seattle City Council's controversial head tax legislation could bring a compromise
The council's 4–0 decision to wait until 2020 before putting the tax proposal before voters leaves Mountain View as the only Silicon Valley city proceeding with the so-called head tax this year.
The Seattle had tax proposal is an employee hours tax
The Seattle Times has reported on the so-called "head tax" proposal