Principles and Structure of Taxation


The impact and incidence of taxation are two concepts in relation to taxation or tax system.  The impact of a tax refers to the person or business on which a tax is levied; whereas the incidence of a tax refers to  all or part of the tax burden is passed on to someone else. In the case of a sales tax, for example, the incidence will depend on the elasticity of demand and supply.
A good tax must possess the following qualities.  These are canons of taxation.  These are generally acceptable as basic principles for a system of taxation.  These canons are 1) Equity, 2) Certainty, 3) Convenience and 4) Economy
According to Canon of Equity, there must be equality of sacrifice, which means that the burden of taxation should be distributed according to people’s ability to pay. It is generally accepted that progressive taxes are the most equitable type of tax.
The canon of certainty implies that the taxpayer should know how much tax he/she has to pay, when it must be paid and how it must be paid. He/she should be able to assess his tax liability from the information provided by the government.
The canon of convenience express that, the taxes must be collected in a convenient form and at a convenient time.  (The pay as you earn system of tax collection is probably the most convenient method in general use.
According to canon of economy the costs of collection and administration should be small in relation to the total revenue.

The structure of tax is of three different types 
1) Progressive taxation
2) Proportional taxation and
3) Regressive taxation.  


 A tax is progressive when it takes a greater percentage of income from the higher income earner than it does from the lower income groups. That is, as taxable income increases the rate of tax increases.
A tax is proportional when all taxpayers pay the same percentage of their income. (UK corporation tax is an example for this)
A tax is regressive when it takes a greater percentage of income from the lower income earner  than it does from the higher income groups.
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