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
Income tax in the Netherlands Income tax in the Netherlands Income tax in the Netherlands (personal, rather than corporate) is regulated by the "Wet inkomstenbelasting 2001" (Income Tax Law, 2001). The fiscal year is the same as the calendar year. Before April 1 citizens have to report their income from the previous year. The system integrates the income tax with fees paid for the general old age pension system (AOW), the pension system for partners of deceased people (), and the national insurance system for special medical care (). There are three categories of income, each with their own tax rates. They are referred to