Economic turmoil emanating from Europe has prompted the Treasury to drop its forecast for growth in 2013 from 3.4 percent to 3.0 percent.
The earlier forecast was only weeks old, and was released in its pre-election fiscal and economic update in late October.
The Treasury view is still more optimistic as the forecast in the latest Quarterly Predictions from the New Zealand Institute of Economic Research, which has consistently picked lower growth since 2008, and forecast 1.5 percent growth in calendar year 2012 last week. Treasury's forecast is for the 12 months ended March.
Prime Minister John Key shrugged off the Treasury growth forecast downgrade as "not overly dramatic" and noted NZIER was always at the bottom of the forecast range in recent times.
"It is likely that the growth will also be lower in subsequent years, but it is too early to judge how material those impacts might be," the latest monthly update from the Treasury said. "We continue to expect the Canterbury rebuild to begin in earnest in the second half of 2012 and to provide an offset to global weakness."