Wealth manager IOOF Holdings has reported a 39 per cent decline in half-year profit to $45.22 million, weighed down by acquisition-related costs and a goodwill impairment.

However, underlying profit for the six months to December 31 is up 19 per cent at $94.84 million, while revenue during the period has come in as steady from a year ago, at $456.17 million.

IOOF on Tuesday declared a fully-franked interim dividend of 27 cents a share, up one cent from a year ago.