In classics of the country (The wealth of Nations), Economist Adam Smith (1723-1790) formulates the rules and control15adjust the tax system. Over time, this standard still holds relevance and đƣợc have very important significance in assessing the tax system in General as well such as each particular tariffs. In volume V, Senior 2 of his book the wealth Of Nations, Adam Smith đƣa out 4 common standards:1. The taxable object should contribute to the support of the Government, as nearly as possible, the assistance levels in proportion to their respective abilities. That is the rate in the revenue which they respectively enjoy under the protection of the State. 2. each individual tax amount payable should definitely, not arbitrarily. Time of submission, how to submit, the submit value, all of which must be clear and simple for contributors and with other people. 3. Each kind of tax should be at a time and in a way that can be most convenient for the taxpayer. 4. Each kind of tax should be flexible so that processing costs to conduct the lowest tax revenues. In General, these rules also tƣơng with the standard đƣợc important contemporary economists accept, including the following main criteria:
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