"This means people who are already struggling are susceptible to sudden bill shock and financial disadvantage.''
The report, released during Anti-Poverty Week, highlighted the inequality in the price pressures felt across different income levels in the community.
It showed more average households are also finding it tough dealing with the pace of price hikes, which are eating into savings.
But households with cash to spend on household entertainment, holidays and computers are enjoying relatively lower prices compared to five years ago.
Ms Smith said while the well-off are able to make choices about their spending and saving, the story is very different for those with no money to spare.
The report calls on government to review government benefit payments to ensure they are adequate and for state and local government to ensure concessions and rebates are properly targeted.
It also recommends government and essential services offer alternative payment options to help vulnerable households and that government review taxation and concessions.
The report uses a range of economic and population data including the consumer price index (CPI) and the household expenditure survey to calculate the cost of living across different income groups.
- AAP