In Washington, IMF managing director Christine Lagarde tried to calm Greek worries, saying that talk of fresh cuts was still "premature" and that details of potential new measures would depend on the effectiveness of tax reforms and the country's privatization program.
"If new measures were needed, I can tell you one thing: It's not going to be in the form of additional fiscal measures and it will not be in form of across-the-board, undifferentiated cuts in wages or pensions," Lagarde told a news conference.
Greece's debt is due to reach 175.5 percent of GDP this year and must fall below 110 percent by 2022.
The IMF says Greece's European bailout creditors will have to forgive some of the loans the country owes them to render the debt manageable, an unpalatable outcome for major creditors such as Germany.
European governments have committed to help Greece manage repayment of its rescue loans, provided it meets its targets. But while some easing of repayment terms is likely, a cut in the actual outstanding sum would be hard to sell to Europe's taxpayers even were their governments in favor.
Meanwhile, new data illustrate the social impact from nearly four years of austerity.
The unemployment rate the highest in the 28-member European Union reached 27.6 percent in July from 27.5 percent a month earlier. Youth unemployment was 55 percent. Industrial output fell 7.2 percent on the year to August, with both imports and exports dropping sharply.
The government expects the economy to start growing again next year the first average annual growth since 2007 but only at an anemic rate of 0.6 percent.
It also forecasts modest jobs growth next year, although unemployment is set to remain at an average 26 percent. The biggest labor union, the GSEE, expects unemployment to exceed 30 percent in coming years.
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AP writers Marjorie Olster in Washington DC and Derek Gatopoulos in Athens contributed.