The Serbian government has formally asked the president to dissolve parliament and schedule early elections.
The January 28 move means the vote is likely to be held on March 16.
The government says it wants to seek the "broadest possible public support" for reforms required after Serbia opened membership talks with the European Union this month.
The Serbian Progressive Party (SNS), the bigger partner in the coalition government, has been pushing for an early vote.
The party is the largest in parliament, but its leader, Aleksandar Vucic, currently holds the post of deputy prime minister.
Opinion polls suggest the SNS could win as much as 45 percent in the elections, while Prime Minister Ivica Dacic's Socialist Party is tipped to win around 10 percent.
Based on reporting by AP and dpa