A tax haven is a state, country or territory where certain taxes are levied at a low rate or not at all. Individuals and/or corporate entities can find it attractive to establish shell subsidiaries or move themselves to areas with reduced or nil taxation levels relative to typical international taxation. This creates a situation of tax competition among governments. Different jurisdictions tend to be havens for different types of taxes, and for different categories of people and/or companies. States that are sovereign or self-governing under international law have theoretically unlimited powers to enact tax laws affecting their territories, unless limited by previous international treaties. There are several definitions of tax havens. The Economist has tentatively adopted the description by Geoffrey Colin Powell (former economic adviser to Jersey): "What ... identifies an area as a tax haven is the existence of a composite tax structure established deliberately to take advantage of, and exploit, a worldwide demand for opportunities to engage in tax avoidance." The Economist points out that this definition would still exclude a number of jurisdictions traditionally thought of as tax havens. Similarly, others have suggested that any country which modifies its tax laws to attract foreign capital could be considered a tax haven.
According to other definitions, the central feature of a haven is that its laws and other measures can be used to evade or avoid the tax laws or regulations of other jurisdictions. In its December 2008 report on the use of tax havens by American corporations, the U.S. Government Accountability Office was unable to find a satisfactory definition of a tax haven but regarded the following characteristics as indicative of it: nil or nominal taxes; lack of effective exchange of tax information with foreign tax authorities; lack of transparency in the operation of legislative, legal or administrative provisions; no requirement for a substantive local presence; and self-promotion as an offshore financial center.
A 2012 report from the Tax Justice Network estimated that between USD $21 trillion and $32 trillion is sheltered from taxes in unreported tax havens worldwide. If such wealth earns 3% annually and such capital gains were taxed at 30%, it would generate between $190 billion and $280 billion in tax revenues, more than any other tax shelters. If such hidden offshore assets are considered, many countries with governments nominally in debt are shown to be net creditor nations. However, the tax policy director of the Chartered Institute of Taxation expressed skepticism over the accuracy of the figures. A study of 60 large US companies found that they deposited $166 billion in offshore accounts during 2012, sheltering over 40% of their profits from U.S. taxes.
The use of differing tax laws between two or more countries to try to mitigate tax liability is probably as old as taxation itself. In Ancient Greece, some of the Greek Islands were used as depositories by the sea traders of the era to place their foreign goods to thus avoid the two-percent tax imposed by the city-state of Athens on imported goods. It is sometimes suggested that the practice first reached prominence through the avoidance of the Cinque ports and later the staple ports in the twelfth and fourteenth centuries respectively. In 1721, American colonies traded from Latin America to avoid British taxes.
Various countries claim to be the oldest tax haven in the world. For example, the Channel Islands claim their tax independence dating as far back as Norman Conquest, while the Isle of Man claims to trace its fiscal independence to even earlier times. Nonetheless, the modern concept of a tax haven is generally accepted to have emerged at an uncertain point in the immediate aftermath of World War I. Bermuda sometimes optimistically claims to have been the first tax haven based upon the creation of the first offshore companies legislation in 1935 by the newly created law firm of Conyers Dill & Pearman. However, the Bermudian claim is debatable when compared against the enactment of a Trust Law by Liechtenstein in 1926 to attract offshore capital.
