The leaders of the three parties in Greece's coalition government have failed to agree on a package of spending cuts worth 11.5 billion euro (£9.2 billion).
The prime minister had said the measure is crucial to restoring the country's financial credibility and sustaining its bailout funding.
Conservative Premier Antonis Samaras and the other two leaders - socialist Evangelos Venizelos and Fotis Kouvelis of the Democratic Left - disagreed on across-the-board cuts in pensions and wages.
The latter two insisted that Greece's international creditors give the country more time to implement the spending cuts.
The three agreed to meet again Wednesday evening. Before that, Mr Samaras will meet the creditors' representatives on Monday and, on Tuesday, with European Central Bank president Mario Draghi, in Frankfurt.
"The talks were not conclusive. There is no final decision on the package...We need to protect the economically weak," Mr Kouvelis, who left the meeting first, told reporters.
"We cannot exceed the (people's) limits of endurance. There are some measures we cannot agree on, such as across-the-board cuts in pensions and cuts in disability benefits," Mr Venizelos said.
The two denied, however, that the governing coalition was shaky.
In the fifth year of a deep recession, Greece has seen its economy shrink by about 20% and the unemployment rate soar to 24.4% in June.
The cuts are required for the release of a long-delayed 31 billion euro (£25 billion) loan instalment from the European Commission, the European Central Bank and the International Monetary Fund, without which Greece would default on its loans.