While all these international negotiations were continuing, on 15 January 2007, around 185 parliamentarians in the recently reinstated House of Representatives voted unanimously in favour of promulgating the Interim Constitution.

Nearly 56 years after King Tribhuvan approved the first Interim Constitution for Nepal, which included preparations for a Constituent Assembly election, this second Interim Constitution was legislated with the same mission, albeit without the involvement of the Royal Family. In fact, it was the first Constitution of Nepal that rendered the King powerless. The Interim Constitution was similar to the first one in many ways. Both subscribed to liberal democratic ideas of a representative government, adult franchise, the rule of law, and freedom and liberty for individuals and groups, and both envisaged the new state as a positive instrument for improving human welfare and social justice. However, the 1951 Interim Constitution was greatly influenced by the Indian Constitution—reflecting principles such as separation of state power, checks and balances of power, independence of judiciary, a bicameral legislature, a majoritarian election system and an executive prime minister. In contrast, the 2007 Interim Constitution was a document of compromise—influenced by the internal political dynamics of a transitional Nepal, and lacking coherent principles or cogent ideology.