A more accurate statement would be that only a few states (7) don't collect income taxes. Most of the states that don't have an income tax have much higher property taxes, sales taxes, and other taxes to make up the difference.
Some tax income at a flat percentage rate, a proportional tax. Some charge a percentage of a person's federal income tax. Others have a progressive tax like the federal income tax. A few states only tax interests and dividends from investments, not wages and salary. Seven states choose to impose no income tax. These states are Alaska, Florida, Nevada, South Dakota, Texas, Washington, and Wyoming.
Almost all states collect income taxes. Some major cities do as well. In New York state, for example, the cities of New York and Yonkers impose a separate municipal income tax, which is calculated on the same form and submitted to the state for distribution to the cities.
No state has federal income taxes that they collect from taxpayers. Currently in tax year 2009 seven states (Alaska, Florida, Nevada, South Dakota, Texas, Washington, and Wyoming) do not tax personal income.
The state where you work and earn the income wants to collect some state income tax on the income that you earn in that state.
collect
Many countries have people exempt from income taxes in some situations. But countries that collect no personal income taxes what so ever are Andorra, Monaco,and The United Arab Emirates.
fiscal policy
Note: this answer is not specific to New Jersey, but is how it works in most states. If this actually has a financial impact on you, you should contact the state's unemployment office for a definitive answer. For days they aren't called in during the school year, yes. Over the summer break, no, unless they have qualifying income from some other job, in which case they may be able to collect unemployment based on that income.
Social Security Disability Income is a Federal program. The rules are the same for all states. This site may be able to answer some of your questions. http://www.socialsecurity.gov/pubs/10095.html#part1
It is difficult because countries collect data in different ways and some countries collect data on expenditures instead of incomes.
I usually describe the period of history and type of militaria that I collect. Some people collect guns or bayonets, only. Some collect uniforms or medals or hats. For example one area that I collect is British Regimental Cap Badges. Each person has their own reason for collecting a specific type of militaria. Some want to collect from a certain period. Others may collect only items related to Paratroopers or Aviators. Some will collect Maps because they are colorful. And some collect things that they think will increase in value. It is a personal taste.
In some states, 20% of your income can be used. see link