Traders are now pricing in a 46 per cent chance of a rate cut at its next meeting in June.
On a monthly basis grocery foods, which make up more than a third of the index, dropped 0.9 per cent in April, as discounted cakes and biscuits slid 6.3 per cent.
Milk, cheese and eggs, which makes up part of the grocery measure, fell 0.4 per cent led by a 2.2 per cent drop in cheese prices.
Fruit and vegetable prices fell the most in the month, down 1.2 per cent, as seasonally low fruit prices offset a 0.1 per cent increase in vegetables.
Meat, poultry and fish prices rose 0.4 per cent, with beef prices now at their highest level, Statistics NZ said. Restaurant meals and ready-to-eat food also increased 0.2 per cent, and non-alcoholic beverage prices rose 0.3 per cent.
The annual gain was led by a 5.3 per cent jump in fruit and vegetable prices, as New Zealanders paid more for lettuce, potatoes and tomatoes, while bananas and strawberry prices also rose.
Meat, poultry and fish rose 2 per cent, restaurant meals and ready-to-eat food price increased 1.6 per cent and non-alcoholic beverages were up 1.8 per cent.
Grocery food prices fell 1.5 per cent in April compared to the same month a year earlier, as prices for bread, butter and cheese fell.
See the latest food price index here: