They had expected that the economy would be picking up by mid-2019, on the back of fiscal stimulus and lower interest rates.
"Instead, recent data suggests that New Zealand economic growth has remained slow, " Stephens said.
Low business confidence was translating into slower hiring, and the forestry downturn
could cause job losses, Stephens said.
He noted confidence at 10-year low in the June Quarterly Survey of Business Opinion.
"Firms remain caught between rising costs – often government-imposed, such as the minimum wage hike –and an inability to pass through price increases for their
products," he said "This is squeezing profits. Expected profitability in the survey dropped to its lowest since the GFC."
In addition to survey data, there was other "harder" evidence that low business confidence is affecting the labour market, he said.
"The official government series of job ads flat-lined from November last year, and has actually fallen in the past couple of monthsquarters ahead."
Westpac economists have retained a more positive outlook on the housing market than some others and they are sticking with that call, anticipating two rate cuts will see a flow on to lower retail mortgage rates.
"In May we predicted that nationwide annual house price inflation would accelerate from 2 per cent now to 7 per cent over the year ahead, partly due to the mortgage rate declines already seen," he said. "Recent data supports our view."
"If we are right about the Reserve Bank cutting the OCR to 1 per cent this year, then we can expect even lower fixed mortgage rates. That could prompt us to upgrade our house price forecast."
Longer-term Stephens remains relatively upbeat about economic the prospect of an economic rebound.
A stronger housing market is like to boost consumer confidence and fiscal stimulus, so far slow to have an impact, will eventually start to boost growth.
"That is probably just a matter of timing – it always takes a new government time to get the wheels of the bureaucracy turning in the direction it wants," he said.