Tax shelter

Tax shelters are any method of reducing taxable income resulting in a reduction of the payments to tax collecting entities, including state and federal governments. The methodology can vary depending on local and international tax laws.

In North America, a tax shelter is generally defined as any method that recovers more than $1 in tax for every $1 spent, within 4 years.

Some tax shelters are questionable or even illegal:

The flaws of these questionable tax shelters are usually that transactions were not reported at fair market value or the interest rate was too high or too low. In general, if the purpose of a transaction is to lower tax liabilities but otherwise have no economic value, and especially when arranged between related parties, such transactions are often viewed as unethical. The agency may re-evaluate the price, and will quickly neutralize any over tax benefits. However, such cases are difficult to prove. A soft drink from a vending machine can cost $1.75, but may also be bought in bulk for $0.25. To prove that the price is in fact unreasonable may turn out to be reasonably difficult itself.

Other tax shelters can be legal and legitimate:

These tax shelters are usually created by the government to promote a certain desirable behavior, usually a long term investment, to help the economy; in turn, this generates even more tax revenue. Alternatively, the shelters may be a means to promote social behaviors. In Canada, in order to protect the Canadian culture from American influence, tax incentives were given to companies that produced Canadian television programs.

In general, a tax shelter is any organized program in which many individuals, rich or poor, participate to reduce their taxes due. However, a few individuals stretch the limits of legal interpretation of the income tax laws. While these actions may be within the boundary of legally accepted practice in physical form, these actions could be deemed to be conducted in bad faith. Tax shelters were intended to induce good behaviors from the masses, but at the same time caused a handful to act in the opposite manner. Tax shelters have therefore often shared an unsavory association with fraud.

Aside from the attempts to stop tax shelters in the United States through provisions of the U.S. Internal Revenue Code, U.S. courts have several ways to prevent tax sheltering activities from happening. The judicial doctrines have a basic theme: to invalidate a transaction that would achieve a result contradictory to the intent or basic structure of the tax code provisions at issue. The following are the judicial doctrines:

...
Wikipedia