例3：某公司使用某零件，可外购也可自制，若外购，单价4元，一次订货成本为10元；若自制，单位成本为3元

例3：某公司使用某零件，可外购也可自制，若外购，单价4元，一次订货成本为10元；若自制，单位成本为3元

由于自制总成本（12240元）低于外购的总成本（14640元），故自制成本为宜。

E-commerce has developed rapidly for 10 years already in our country, especially in recent years, more and more quickly, the impact on the national economy is becoming more and more profound. This paper introduces the definition, types of electronic commerce and the present situation in our country, the necessity of the taxation of e-commerce, and elaborates its necessity from the maintenance of the fair principle of Taxation and protect the future of stable revenue two angles. In the future in China will levy taxes to the electronic commerce of the conclusion, the thesis also analyses the E-commerce Context of a new era of the taxpayer, tax object, tax administration and international tax impact and challenge, which summed up China's e-commerce taxation may encounter problems. Finally, based on the economic data and the regulations of the latest dynamic, put forward suggestions to deal with the e-commerce taxation problems. And further from the recent initiatives and long-term strategy of two angles, from China's actual situation, in order to improve the electronic commerce tax laws and regulations, constructing scientific and effective management system under the environment of e-commerce and puts forward suggestions.
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