By contrast, stronger inflation data in New Zealand means "there's a bit less pressure for the Reserve Bank to follow up with back to back cuts and makes a reasonable case for it to hold off."
Nicholson said that by waiting until June to cut the official cash rate, the Reserve Bank will give itself more time to assess how the kiwi economy is tracking.
The trade-weighted index is currently well above the 70.9 level the central bank forecast in its March monetary policy statement. But Nicholson said the drivers pushing the kiwi up "are far beyond the RBNZ's control".
"Like the Australian dollar, the kiwi is at the whim of the Fed and global markets," he said.
The latest GlobalDairyTrade auction tonight is expected to show a slight gain in prices, which may underpin optimism dairy products have found a base.
The New Zealand dollar traded at 89.97 Australian cents from 90.18 cents yesterday and was little changed at 48.91 British pence from 48.83 pence. It gained to 61.79 euro cents from 61.31 cents and rose to 76.30 yen from 74.76 yen. The kiwi rose to 4.5292 yuan from 4.4838 yuan.
The two-year swap rate rose 3 basis points to 2.27 per cent and the 10-year swaps rose 5 points to 2.96 per cent.