Usually legal residence and tax residence are defined differently in law in that one can be an illegal alien and resident for tax purposes in the same country. Also, it is possible to be resident, for tax purposes, in more than one country at a time.
Domicile is, in many countries, a different legal concept to residence.
In the face of growth in the scope of governmental regulation, and an increasing burden of taxation, corporations and individuals not surprisingly have sought to avoid, or at least to minimise, the effects of state intervention. This was particularly important with respect to taxation, both from the perspective of governments – which would lose revenue – and that of corporations or individuals who sought to avoid payment of taxes.
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One option that became available in this respect was the tax haven – a country that attracted overseas companies and individuals to register or otherwise obtain legal residence, in return for paying minimal tax. As states alone levied taxation, so states alone could offer taxation incentives to investors. There was a significant rise in the number of tax havens in the course of the 20th century. This has continued into the 21st century, even though tax burdens have in many cases eased. Possibly half of all money in circulation throughout the world either resides in or passes through tax havens. In very few of these cases do the investors actually physically reside in the tax havens. It is generally sufficient if their legal residence is within the haven. If companies or individuals were required to relocate completely from one jurisdiction to another to take advantage of a tax haven, interest in tax havens would perhaps have remained relatively insignificant. Use of a tax haven usually requires only a legal move, the management of most companies – and private investors – remaining physically located elsewhere.