The yield gap, or spread, on New Zealand 10-year bonds versus comparable US Treasuries has widened since the early February, when Greek leaders first signalled they would agree to austerity measures needed to win a second tranche of bailout funds. The spread has risen to around 220 basis points, the highest since November.
Hawkesby says the smaller size of recent debt auctions partly reflects that New Zealand bonds "have fallen off the radar of some international investors as pressures in Europe have eased, reducing the relative attractiveness of the New Zealand story."
Foreign investors held 56.7 percent of government bond and Treasury bills on issue in January, down from 57.8 percent in the same month last year, according to Reserve Bank figures.
The government will update its debt funding needs and bond sale plans with the budget on May 24. In the Budget Policy Statement on Feb. 16, the Treasury cut its forecast for gross domestic product in the year ending March 311.9 percent, down from a previous estimate of 2.3 percent. Growth in 2013 was cut to 2.8 percent from 3.8 percent.