The Abbott government is facing fresh troubles to pass budget savings measures, with Labor and the Greens threatening to block plans to freeze childcare benefit income thresholds.

The government wants to freeze the level of family income at which the maximum child care subsidy can be claimed at $42,000 a year for the next three years and to continue to pause the maximum rebate at $7500 per child.

Labor's early childhood spokeswoman Kate Ellis says Labor will block measures to freeze child care benefits. Credit:Andrew Meares

Both measures would save the government about $330 million.