Family incomes have increased by less than the rate of inflation and Opposition parties are renewing calls for an increase in the minimum wage.
Statistics NZ's latest income survey shows median weekly incomes rose by just $6 in the year to June compared with the previous 12 months.
Labour's finance spokesman, David Parker, says it's the lowest annual increase since 1999.
"With weekly incomes rising more slowly than inflation, Kiwi families have less money at the end of the week than they did this time last year," he said on Thursday.
"At a time when jobs are hard to come by and losses are announced every week, many families are in real trouble because they can't earn enough."
The Greens say the figures mean that since 2008 household weekly incomes have risen 3.7 percent while the cost of living has increased 10.1 percent.
"Living costs continue to rise while incomes are falling behind," co-leader Metiria Turei said.
"These figures highlight the urgent need to raise the minimum wage and make sure vulnerable families can make ends meet."
Labour, the Greens and NZ First want the minimum wage raised from the current $13.50 an hour to $15 an hour.
A Labour Party bill that would have done that was defeated by a single vote in Parliament last month.
NZN