Government and judicial response

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Tax avoidance reduces government revenue, so governments with a stricter anti-avoidance stance seek to prevent tax avoidance or keep it within limits. The obvious way to do this is to frame tax rules so that there is a smaller scope for avoidance. In practice this has not always been achievable and has led to an ongoing battle between governments amending legislation and tax advisors finding new scope/loopholes for tax avoidance in the amended rules.^{[citation needed]}
To allow prompter response to tax avoidance schemes, the US Tax Disclosure Regulations (2003) require prompter and fuller disclosure than previously required, a tactic which was applied in the UK in 2004.
Some countries such as Canada, Australia, United Kingdom and New Zealand have introduced a statutory General Anti-Avoidance Rule (or General Anti-Abuse Rule, GAAR). Canada also uses Foreign Accrual Property Income rules to obviate certain types of tax avoidance. In the United Kingdom many provisions of the tax legislation (known as "anti-avoidance" provisions) apply to prevent tax avoidance where the main object (or purpose), or one of the main objects (or purposes), of a transaction is to enable tax advantages to be obtained.
In the United States, the Internal Revenue Service distinguishes some schemes as "abusive" and therefore illegal. The Alternative Minimum Tax was developed to reduce the impact of certain tax avoidance schemes. Furthermore, while tax avoidance is in principle legal, if the IRS in its sole judgment determines that tax avoidance is the 'principal purpose' for an expatriation attempt, 'covered expat' status will be applied to the requester, thereby forcing an expatriation tax on worldwide assets to be paid as a condition of expatriation.^[68] The IRS presumes a principal purpose of tax avoidance if a taxpayer requesting expatriation has a net worth of $622,000 or more, or has had more than $124,000 in average annual net income tax over the 5 tax years ending before the date of expatriation.