The post-Fed retreat in New Zealand swap and bond yields suggested the market had put the risks towards a higher number than economists' forecasts.
Westpac senior market strategist Imre Speizer said the US market reaction to the Fed's statement was muted, until Fed chairman Jerome Powell's comments at a news conference suggested the central bank was taking on a more hawkish than expected stance.
"The NZ CPI was within expectations, so the market put that aside," Speizer said.
"It was all about the Fed, which delivered a hawkish surprise to the markets by intimating that it might tighten faster than previously thought, which has pushed rates up everywhere," he said.
The New Zealand two-year swap rate jumped to 2.5 per cent on the Fed news from 2.44 per cent earlier, then backed off by 2 basis points after the CPI.
The New Zealand dollar was static, post CPI, at around US66.50c and the New Zealand share market was a touch softer.
By midday, the S&P/NZX/50 index was at 12,178, down 0.6 per cent from Wednesday's close.