Fonterra is expected to reveal operating earnings at the lower end of an already published forecast range for the year to July 31 when it reports its result tomorrow.
The co-operative's guidance is for earnings before interest and tax (ebit) of $500 million-$600 million, down from $937 million in 2013/14.
"Expectations are for ebit to be at the lower end of this range, due mainly to the adjustment to the value of Fonterra's year-end inventory," the co-operative said in its latest update.
The reduced forecast reflected a sharp fall in global dairy prices as reflected by the GlobalDairyTrade price index, which has dropped 45 per cent since February.
At the farmgate, farmer-shareholders are bracing for an expected decline in the milk price from Fonterra's forecast of $6 per kg for 2014/15, which with an estimated dividend of 20c-25c per share would take the payout to $6.20-$6.25 per kg.