Jaitley also hoped the main opposition Congress will come on board to help in the passage of the India's biggest indirect tax reform bill since independence in the ensuing monsoon session of Parliament and said failing which the government will have no option but to seek for a Parliamentary vote.
"The whole world is looking at India as to when India rationalises its indirect tax regime," he said at a conference organised by Institute for International Economic Studies here.
"The idea behind the GST is to make India into a one common market to have a seamless transfer of goods and services, to prevent tax-on-tax, make goods and services cheaper and therefore provide to any person a very large markets that is one-sixth of world population," he said.
Jaitley, who is on a six-day investor wooing tour of Japan, said, "GST will reduce the level of taxation because there will be no tax-on-tax. It will bring prices down, it will enable businesses far more."
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"This was proposed by the previous government. We have accepted it. It has been passed by the Lower House (and now) it requires to be cleared by a two-third majority in Upper House. Almost every political party in principle says it supports the GST," he said.
Jaitley said he was "quite confident" that GST had support of two-third members of the Rajya Sabha "because almost every regional party supports it because regional parties also come from areas which are consuming states and all consuming states benefit from the GST."
The main opposition party wants the rate of the goods and services tax capped at 18 per cent, the proposed 1 per cent additional levy on inter-state trade be removed and an independent dispute resolution mechanism for states set up.
"One particular change I am willing to accept. (In) others there is some difficulty," he said referring to the demand for removal of 1 per cent additional levy.
A Committee headed by Chief Economic Adviser Arvind Subramanian had in December last year had recommended doing away with the additional one per cent tax on inter-state sales over and above the GST rate as well as keeping the GST rate at 17-18 per cent.