of specific items of foreign income from the base of taxation. Individuals The following table summarizes the taxation of local and foreign income of individuals, depending on their residence or citizenship in the country. It includes 244 entries: 194 sovereign countries, their 40 inhabited dependent territories (most of which have separate tax systems), and 10 countries with limited recognition. In the table, income includes any type of income received by individuals, such as work or investment income, and yes means that the country taxes at least one of these types. Residency Taxing regimes are generally classified as either residence-based or territorial. Most jurisdictions tax income on a residency basis. They need to define "resident" and characterize the income of nonresidents. Such definitions vary by country and type of taxpayer, but usually involve the location of the person's main home and number of days the person is physically present in the country. Examples include: The United States taxes its citizens as residents, and provides lengthy, detailed rules for individual residency of foreigners, covering: periods establishing residency (including a formulary calculation involving three years); start and end date of residency; exceptions for transitory visits, medical conditions, etc. The United Kingdom, prior to 2013, established three categories: non-resident, resident, and resident but not ordinarily resident. From 2013, the categories of resident are limited to non-resident and resident. Residency is established by application of the tests in the Statutory Residency Test. Switzerland residency may be established by having a permit to be employed in Switzerland for an individual who is so employed. Territorial systems usually tax local income regardless of the residence of the taxpayer. The key problem argued for this type of system is the ability to avoid taxation on portable income by moving it outside of the country. This has led governments to enact hybrid systems to recover lost revenue. Citizenship In the vast majority of countries, citizenship is completely irrelevant for taxation. Very few countries tax the foreign income of nonresident citizens in general: taxes the foreign income of its nonresident citizens at a reduced flat rate of 2% (income tax rates for local income are progressive from 2 to 30%). It has been reported that Eritrea enforces this tax on its citizens abroad through denial of passports, denial of entry or exit from the country, confiscation of assets in Eritrea, and even harassment of relatives living in Eritrea, until the