The Westpac McDermott Miller Consumer Confidence Index dropped sharply in the June quarter, falling to the lowest level recorded since the survey began in 1988.
The drop of 13 points to a level of 78.7 indicates that there are far more New Zealanders who are pessimistic about the economic environment than those that are optimistic.
"Household budgets are being squeezed in a way that they haven't been for decades," said Westpac's chief economist Michael Gordon.
"The combination of rising mortgage rates and increases in living costs has already taken a large bite out of disposable incomes. And with interest rates set to rise even further, many households will find the pressure on their finances becoming more intense over the coming months.
"The pressure on household finances is weighing on spending appetites, and we're expecting a downturn in economic growth more generally over the coming months," Gordon said.