Livni, the designated successor to Ehud Olmert, the scandal-hit outgoing prime minister, is expected to inform Shimon Peres, the country's president, of her decision to call an election in a meeting on Sunday.
But Peres will not have to instantly call elections and some analysts believe Livni could be given more time to form a coalition.
"Israeli politicians are extremely creative in finding solutions for crisis and it is possible that there will be a deal or some kind of new negotiations to give Livni another chance," Menechem Hofnung, a lecturer at the Hebrew University in Jerusalem, told Al Jazeera.
"The legal limit is still a week from now so don't be surprised if something comes up, but it looks like we will go to elections."
On Thursday, Livni had to give potential coalition partners an ultimatum - three days to join a new government under her leadership or face the prospect of going to the polls - but that self-imposed deadline has now passed.
The Kadima party already had the backing of the centre-left Labour party and was expected to keep the small Pensioners party in the government, but it needed to get the ultra-Orthodox Shas party on board to secure a majority in the 120-seat parliament.
Shas said on Friday it would not join Livni as she had refused to pledge that the future status of Jerusalem would not be on the agenda in negotiations with the Palestinians.
Status of Jerusalem
Sovereignty over Arab parts of Jerusalem, where around 270,000 Palestinians live, is a key Palestinian demand without which a peace deal would be impossible.
The renewal of Israeli-Palestinian peace talks at a US-hosted conference last November was supposed to have produced a final deal by the end of 2008, but there has yet been no agreement.
Saeb Erekat, a Palestinian negotiator, said on Saturday that a scheduled Monday meeting between Olmert and Mahmoud Abbas, the Palestinian president, had been postponed until further notice, but gave no reason for the delay.
|The Shas party's rejection left Livni unable to form a coalition government [EPA]
Israeli Radio, citing unnamed Abbas aides, said the postponement was due to internal Israeli political events.
Given the lack of movement towards a peace deal, Palestinian and Israeli analysts say that an Israeli election could ultimately have less impact than the upcoming US presidential vote - even if it were to put Benjamin Netanyahu, an opposition leader, into power at the head of a right-wing government.
Khalil Shaheen, a political analyst and senior editor at Al-Ayyam newspaper in Ramallah, said that movement towards an Israeli-Palestinian deal has slowed due to changes in the Israeli, US and Palestinian political landscapes.
"By early February, there will be three new governments - one each in Israel, the US and Palestine. This means that no-one can make any progress on the political process in the coming months," he said.
Israeli politicians are however moving towards a regional framework to discuss peace with Arab governments, rather than just a focus on an accord with the Palestainians.
"This is something that the Israeli president [Peres] offered the Egyptian president Hosni Mubarak last week. Peres is trying to convince Ehud Barak, the head of the Labour party and Israel's defence minister, and Livni of the [benefits] of a regional framework.
"If we take into consideration that Benjamin Netanyahu calls for entering into an Arab element into the peace negotiations with the Palestinians, we may find a shift towards negotiations between Israel and the Arabs, instead of holding negotiations seprately on the Palestinian track and on the Syrian track."
Opinion polls have indicated that Netanyahu's Likud party would sweep to power in a general election, but critics say that Netanyahu would stifle the peace process if elected.
"Netanyahu is definitely bad news for the peace process - that does not exist anyhow - and Livni is a person who was the chief negotiator and she didn't do anything," Ghassan Khatib, a former minister in the Palestinian cabinet, said.
"The only other alternative is if the American administration will try to engage. This can make a difference, regardless of the [composition of] the Israeli government."