The Congress has been stalling passage of the Bill in the Rajya Sabha where the ruling NDA is in a minority.
Speaking at an industry meet on GST, he said the proposed one per cent additional tax on inter-state sales was proposed as manufacturing states like Gujarat and Tamil Nadu are of the opinion that they would lose out on revenue as GST is more of a destination tax.
Referring to the recommendation of the panel headed by Chief Economic Advisor Arvind Subramanian, he said it is "settled" that the standard rate is going to be less than 18 per cent or much less than 18 per cent.
GST is to subsume all indirect taxes like excise duty, sales tax and service tax. In the new regime, there will be one Central GST, or C-GST, and State GST, or S-GST.
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This CST will no longer be available in the new regime and a one per cent additional tax was proposed to make up for it.
On the other condition that 18 per cent tax should be put in the Constitutional Bill, Jaitley said, "Are tariffs part of Constitution? Can tariffs ever be cast in stone?"
"GST is an idea which I have no doubt that, if not today, tomorrow it has to be approved, we are just going through the agony prior to the passage of the Bill," Jaitley said.
He said there will be no single rate for all goods and services.
"For commodities which will be used by the weaker section, aam aadmi, will be lower (and) for the rest of the commodities you will have a standard rate.
"For luxury products, sin products, the rate will be higher. And therefore it is irrational to say that we put a 18 per cent cap in the Constitution", Jaitley said.
"And if (differences) still persist, the Council will create the dispute redressal mechanism. That issue actually becomes a non-issue. So the issues are actually resolvable, provided there is an intention to resolve them," Jaitley said.
The Minister said that doing away of the one per cent additional levy would help consuming states and bring inter-state equity.
However, there was no consensus among the states and the BJP-led NDA government brought over an "absolute consensus".
Only after the consensus, the Constitution Amendment Bill was introduced in Parliament.
"My friends in Congress party said even though it was they who brought out the Bill we want to again send it to the Select Committee (of Rajya Sabha). So it again went to Select Committee," he said.
The Rajya Sabha Select Committee cleared it with suggestions but Congress in the last monsoon session told the government that it can't pass it in that sitting and it can be taken up in the next winter session.