The loss of trust caused by the Catholic Church's child sex abuse scandal and the financial impact of paying millions of dollars in compensation could hurt a religious order's reforms, an inquiry has heard.

The De La Salle Brothers have paid $34.8 million to 227 people who allege they were sexually abused as children by people in the order.

Its professional standards officer Brother Ambrose Payne says the order has implemented systemic, operational and cultural reforms since the child sex abuse royal commission began in 2013.

It included developing a victim-orientated approach in place of the historically defensive approach and a significant increase in the provision of ongoing counselling and victim support, he said.

Asked to nominate impediments to the effectiveness of the reforms, Brother Payne pointed to financial issues and a loss of trust.

"Financial impediments derive principally from the erosion of financial resources as a result of reparations," he said in a statement to the royal commission.

"Loss of trust impediments diminish the possibility of a religious congregation's best efforts to restore the confidence that has provided significant and unquestioned positive contributions to the fabric of the Australian and other societies."

The De La Salle Brothers have received child sex abuse claims from 328 people that identified 145 alleged perpetrators.

Brother Payne said no current members of the order have been convicted of child sex abuse, although there are former members who are still alive and are convicted abusers.

More than 40 per cent of St John of God Brothers and 20 per cent of Marist Brothers, Christian Brothers and Salesians of Don Bosco have been the subject of child sex abuse claims to the Catholic Church in Australia.

For the De La Salle Brothers, the figure is 13.8 per cent of those who ministered between 1950 and 2010.

The royal commission's final hearing into the Catholic Church on Wednesday hears from a panel comprising Brother Payne and the provincials of the Jesuits, Christian Brothers, Marist Brothers, Salesians and St John of God order, as well as the leader of the Institute of Sisters of Mercy.

© AAP 2017