Voters in low-income households prefer Labor, but the Coalition enjoys more support in all other income brackets, according to an analysis of recent Newspolls.
The analysis conducted for The Australian found Labor's support base has shrunk to voters in households earning less than $50,000 a year.
In that income bracket, support for Labor outranked the Coalition 37 per cent to 35 per cent.
However voters in households bringing in $50,000 to $90,000 a year backed the Coalition 43 per cent to Labor's 35 per cent, while the margin increased in households earning between $100,000 and $150,000 - 50 per cent backed the Coalition to Labor's 28 per cent.
Voters in households earning even more supported the Coalition 50 per cent to Labor's 29 per cent.
The three surveys analysed were carried out between November 7 and December 8 and involved a total of 4562 voters.
The polls were conducted before Prime Minister Scott Morrison cut an overseas holiday short after criticism of how he handled the bushfire crisis.
The analysis shows the Coalition leads Labor on a two-party preferred basis 51 per cent to 49 per cent, though its primary vote slipped slightly since the election to 41 per cent, while Labor's rose to 34 per cent.
Men were more likely to back the government than women.
Opposition Leader Anthony Albanese's net approval rating of -3 continues to outrank Prime Minister Scott Morrison's -5.
Labor made gains in Queensland with its primary vote rising from 27 to 29 per cent since the federal election, as the LNP's dropped three percentage points to 40 per cent.
However in Victoria the Coalition still leads Labor on the primary vote 40-38 per cent, and 42-35 per cent in NSW.
Australian Associated Press