Sharif, 72, officially took up office at a swearing-in ceremony at the presidential office in the nation's capital, Islamabad, a day after parliament elected him prime minister despite protests from lawmakers aligned with jailed former premier Imran Khan.
His first meeting after the ceremony was with his finance team, a statement from the prime minister's office said late on Monday, adding that he directed them to begin talks with the International Monetary Fund (IMF) on an extended funding facility. The current agreement expires in April.
"We got a mandate to improve country's economy and that's our government's top priority," the statement said.
During his oath-swearing Sharif wore a black traditional overcoat, called a sherwani, in the ceremony, broadcast live on state TV and attended by civil, military, bureaucracy and other dignities.
The Feb. 8 election was marred by a mobile internet shutdown, arrests and violence in its build-up and the unusually delayed results triggered accusations that the vote was rigged.
Candidates backed by Khan gained the most seats but the Pakistan Muslim League-Nawaz (PML-N) and the Pakistan People's Party (PPP) agreed to form a coalition government. The PML-N is spearheaded by Shehbaz Sharif's elder brother, three time premier Nawaz Sharif, but he decided not to take the prime minister's post.
The younger Sharif returns to the role he previously held until August, when parliament was dissolved to prepare for the election.
Economists, investors and foreign capitals would now be watching closely for an announcement by Sharif on the cabinet, especially the important finance portfolio. The next finance minister will have to lead tough talks with the IMF to get a new multi-billion dollar funding agreement.
Former four-time finance minister Ishaq Dar remains the top contender, PML-N sources have told Reuters, though several other candidates were being seriously considered.
