Income tax in the United States to file tax returns for federal and many state and local returns. Tax as determined by the taxpayer may be adjusted by the taxing jurisdiction. A tax is imposed on net taxable income in the United States by the federal, most state, and some local governments. Income tax is imposed on individuals, corporations, estates, and trusts. The definition of net taxable income for most sub-federal jurisdictions mostly follows the federal definition. The rate of tax at the federal level is graduated; that is, the tax rates on higher amounts of income are higher than on lower amounts. Some states and
Income tax in Singapore of assessment is based on income earned in the preceding calendar year. Taxation is based on the source principle, in which only income earned at source, in this case in Singapore, or those derived from overseas but received in Singapore, are taxable. Any income arising from sources outside Singapore and received in Singapore on or after 1 January 2004 by an individual (other than partners of a partnership) is exempt from tax. This system has the potential to allow for tax avoidance practiced by individuals who derive income from abroad, gain tax exemptions via their non-resident status there, and use