The Christian Brothers have completed payments towards the cost of a redress scheme set up to help survivors of institutional child sex abuse, ten years after they agreed to pay the financial contributions.

The Department of Education said a final €6.8 million was paid over in the last four months through a series of monthly cash transfers.

The completion of the payments follows a warning last July from the agency tasked with providing financial support to abuse survivors, Caranua, that it did not have enough money to cover the cost of outstanding supports for survivors unless it "urgently" received the last of the funds pledged to it by the Christian Brothers.

The warning was reported in the Irish Examiner newspaper.

The payments made over the past months bring the total contributed by the congregation to €30m.

The money was pledged in 2009 after the publication of the Ryan report into institutional abuse. The religious congregations offered property and cash valued at €353m - that offer was later reduced to €226m.

The Department of Education also said that the amount likely to be achieved under the 2009 voluntary scheme made by religious congregations will be lower than what was offered because some elements were rejected and some property was worth less than it was originally valued for.

It says that the the revised effective total for 2009 voluntary contributions by the religious congregations is €310m.

But it it understood that that a figure of less than €310m will actually be realised.

In a statement the Department said that it will not be possible to give a precise final figure for the total contributions received until such time as all elements of the 2009 offers are completed including property transfers.

Years earlier, in 2002, the State gave the religious congregations an indemnity which limited their contribution towards compensation for victims to €128m.

That indemnity was the subject of widespread criticism in subsequent years after the cost of compensation was revealed to be far greater than originally anticipated.

The Department of Education said the payments made by the Christian Brothers since September will ensure that Caranua will be able to complete its work.

Minister for Education Joe McHugh said the payments meant that Caranua now had access to the full €110m in cash contributions which were committed to by the congregations.

A further portion of the contribution made by the Christian Brothers, €428,000, is to be paid to the new National Children's Hospital.

Under the provisions of the Residential Institutions Statutory Fund Act 2012, no more than €110m in contributions may go to the Caranua fund.

Any amounts in excess of that figure go to the funding of the development of the National Children's Hospital.

Speaking to RTÉ's Morning Ireland, the executive director of abuse survivors group One In Four, Maeve Lewis, said there were a lot delays to get to this point and that it is her understanding that there is still money outstanding from other religious congregations so the full amount remains to be paid.

Ms Lewis said the redress support needed for survivors will be well in excess of the religious contributions and added that it was estimated that €1.5bn would be needed.

She said Caranua had run out of money and that it had stopped taking applications in August.

Ms Lewis said it now falls to the Government as to how they are going to support the survivors as they move into old age.

In a statement Caranua said they welcome the final contribution of €1.571 million from the congregation of the Christian Brothers. 

Caranua said: "This final contribution means that Caranua has now received the full committed €110 million in cash contributions as set out in the Residential Institutions Statutory Fund Act 2012.

"Caranua has always operated in the expectation that the full contribution of €110 million would be received, and the receipt of this final contribution ensures that we can continue to distribute the remainder of the Fund to meet the funding support needs of Survivors with open applications in line with Caranua's wind-down plan.

"Caranua is reviewing how to equitably allocate any potential surplus of the Fund to eligible Survivors of Institutional abuse who have not yet availed of funding supports."