He says the decision to borrow such a big lump was driven primarily by investor demand, giving the country the opportunity to access cheaper money than it otherwise would have.
As it stands, Combes says the NZDMO has about $10 billion in cash, more than enough to cover a $7.6 billion bond maturity in November, amongst other demands.
The NZDMO only needs to raise another $2 billion in net debt this fiscal year to meet its targets, which Combes says puts New Zealand at a distinct advantage compared to last year.
"Last year we had to raise $20 billion," he says. "Now our call on offshore capital markets has diminished substantially."
The real test will come this Thursday when the next bond tender goes to market but Combes is confident the NZDMO will be able to raise the money at reasonable rates.
A September 15 article in the Lex column of the Financial Times (FT), however, questioned the country's borrowing status, claiming the so-called 'bond vigilantes' have "alighted on New Zealand".
"Funding strains appear to be visible in the tally of failed government bond auctions: 12 so far this year, surpassing 2010's total," the Lex column claimed.
But Combes disputes this analysis. He says this year the NZDMO only recorded one bond auction failure, that is where it didn't raise the full amount it sought.
According to Combes, the FT claims probably relate to the occasions the NZDMO has exercised its discretion to 'reallocate' different bond maturities to bidders depending on overall demand.
It looks like the bond vigilantes aren't ready to kick New Zealand in the groin just yet.