The Parliament on Monday passed the historic GST Bill with the Lok Sabha adopting the legislation, which was last week passed by Rajya Sabha.
Bill was passed by two-third majority, with 443 members voting in its favour and none against in the final vote.
AIADMK members in the Lok Sabha had earlier staged a walkout.
Speaking on the occasion, Prime Minister Narendra Modi said on Monday that the Goods and Services Tax Bill was a "very big and important step" towards getting the country rid of "tax terrorism".
He described GST as a "Great Step by Team India, Great Step towards Transformation and Great Step towards Transparency" and a big message of the uniform tax law will be that "consumer is the king".
The PM countered Congress leader M. Veerappa Moily's contention that the government had consulted only Rajya Sabha leaders on the uniform tax law and thereby reduced the Lok Sabha to a "junior partner".
"Such description was uncalled for," Modi said and maintained that when his government began consultations on the GST, he had met both Congress president Sonia Gandhi, a member of Lok Sabha, and former prime minister Manmohan Singh, a Rajya Sabha member.
"One is a Lok Sabhe MP and other is from Rajya Sabha. I treated both the houses equally. Question of treating Lok Sabha as a junior house does not arise," the Prime Minister said.
Earlier during the debate, Moily said, "It is as if this house (Lok Sabha) does not have the brains" and lamented that treasury bench floor managers only consulted members from the upper house.
The PM maintained that having seen the issues concerning GST as Gujarat Chief Minister, he said now that he is the Prime Minister he finds it easy today to address these problems.