Fitch Ratings' decision to cut New Zealand's credit rating was stoking speculation of a similar move by Standard & Poor's, which has the sovereign rating on negative outlook on the risks associated with the size of the nation's external debt.
Fitch said foreign debt was a "key vulnerability" as it lowered the rating one notch to AA. It raised the outlook to 'stable' from 'negative,' where it had been since July 2009. New Zealand's foreign currency rating at S&P is AA+. Moody's Investors Service has an Aaa rating.
"The real news in today's announcement is that it increases the chance that S&P also downgrade their rating to AA," said Christian Hawkesby, head of fixed income at Harbour Asset Management in Wellington. "By focusing on net external debt, S&P follows a similar methodology to Fitch."
The New Zealand dollar recently traded at 76.88 US cents, down from 77.66 cents before the Fitch statement. It earlier sank to a six-month low of 76.46 cents. Government bonds fell, pushing the yield on the 10-year benchmark bond up about 12 basis points to 4.46 per cent.
Hawkesby said he doesn't expect much more of a sell-off in New Zealand government debt.