Income tax return for taxation also vary, making comparisons all the more difficult. Countries that tax income generally use one of two systems: territorial or residential. In the territorial system, only local income – income from a source inside the country – is taxed. In the residential system, residents of the country are taxed on their worldwide (local and foreign) income, while nonresidents are taxed only on their local income. In addition, a very small number of countries, notably the United States, also tax their nonresident citizens on worldwide income. Countries with a residential system of taxation usually allow deductions or credits
Citizens for Tax Justice Citizens for Tax Justice Citizens for Tax Justice is a Washington, D.C.-based think tank and advocacy group founded in 1979 focusing on tax policies and their impact. CTJ's work focuses primarily on federal tax policy, but also analyzes state and local tax policies. Its stated mission is to "give ordinary people a greater voice in the development of tax laws." CTJ's goals include: "fair taxes for middle and low-income families; requiring the wealthy to pay their fair share; closing corporate tax loopholes; adequately funding important government services; reducing the federal debt; [and promoting] taxation that minimizes distortion of economic markets."