The crunch in international credit markets and unexpected natural disasters are the main caveats ahead of Suncorp boosting profits by 10% this year, CEO John Mulcahy says.

Speaking in New York at the Merrill Lynch Investment Conference, Mr Mulcahy largely repeated the group's profit announcement from August while warning investors against over-reaching on synergy savings from the integration of Promina.

Suncorp has already banked $55 million in integration savings through merging the company's reinsurance programs and removing duplication and other inefficiencies.

Mr Mulcahy said he still expected $225 million in annual synergy benefits after a one-off integration loss.

"While the quantum of synergy realisation during this phase is ahead of our pre-merger forecasts, I continue to caution against using this data to draw conclusions about the overall quantum of synergies available as a result of the merger," he said.

"But (we) will rely on the detailed work being undertaken during phase 2 of the integration to provide the level of confidence necessary to accurately update the market when it is appropriate to do so.

"At the group level, we anticipate providing sustainable growth in dividends, although not necessarily at the same rate as in previous years," he said.