Other churches and charities are expected to follow the Catholic Church in joining the $3.8 billion national redress scheme for child sexual abuse survivors.
The Catholic Church's move is significant, given it will be the first non-government institution to opt in to the scheme and because it has estimated it will itself be liable for about $1 billion in compensation.
Federal Social Services Minister Dan Tehan expects more institutions to follow, saying there could be further announcements as early as Thursday.
"(The) development is incredibly welcome and I think goes a long way to making sure we will have a national redress scheme which is comprehensive and will reach as many survivors as we possibly can," he told reporters.
Catholic leaders have long backed a national redress scheme but the churches, charities and other non-government institutions needed the states and territories to sign on before they could opt in.
Western Australia is the final state yet to sign up, although state Attorney-General John Quigley believes the negotiations with the federal government could be finalised within six to eight weeks.
Mr Tehan said the negotiations have been very constructive and the remaining issues have been finalised.
Legislation to enable the opt-in scheme passed federal parliament's lower house on Tuesday night.
Mr Tehan said the scheme was on track to begin on July 1 if the legislation passed the Senate.
The Australian Catholic Bishops Conference and Catholic Religious Australia on Wednesday confirmed the church will enter the scheme when it became law.
ACBC president Archbishop Mark Coleridge said an agency will be established to allow dioceses and religious congregations to interact with the independent national redress scheme operator.
Mr Tehan said the church's move to bring all the dioceses and Catholic orders under the umbrella of one company will make it lot easier and simpler for the federal agency administering the scheme.
There are calls for other institutions to sign up as soon as possible.
The Anglican Diocese of Melbourne this week said it is committed to joining the scheme.
The scheme will cover about 60,000 institutional child sexual abuse survivors nationally, with compensation payments capped at $150,000.