Urging the opposition parties to "display broad shoulders", he said they should not "disassociate" from the decision they were a party to.
The Goods and Services Tax, which will unify a dozen state and central levies to weave India into one market, is the biggest tax reform since the Independence, he told reporters here.
First Trinamool Congress and today Congress and Left parties decided to boycott the midnight function in protest against the way GST is being implemented, adversely impacting small and medium enterprises.
"I can say this without fear of contradiction that there has never been this (kind of) exercise, of this kind of political consultation and political consensus in bringing the GST," he said.
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Jaitley said a party to such consultation and decision making process must also accept that GST is not just a decision of the central government but an equal decision of 31 states and UTs.
The government, he said, remains committed to GST as to any other reform process because it believes that this is probably the single most important taxation reform in 70 years.
"And I am sure it will prove beneficial for both the economy and the country itself," he said. "I hope every political party will reconsider and revisit its decision and be a party to the launch of a massive reform to which they have been themselves privy to."
GST, he said, is in the national interest. "Every political party should have the courage to own up a reform for which they had voted for."
Jaitley hoped that the parties which have decided not to participate in the inaugural function will reconsider their positions.
The government, he said, is committed to economic reforms. "We will continue to do economic reforms and our approach has been that we discuss with every political party and state government (on these reforms) and then decide," he said.
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