The Congregation of Christian Brothers, a Catholic community who do evangelism and youth work, owed €6.8m to agency Caranua because of a pledge they made to the organisation.
The Irish Department of Education and Skills said on Monday that it had been paid, completed through a series of monthly cash transfers between September and December this year.
Caranua, a state body, was set up to deal with a €110m scheme to help improve housing, health and education for people who suffered abuse as children in residential institutions.
The Irish Minister for Education, Joe McHugh, whose department oversees the survivor fund, said: "I welcome the latest contributions made by the Christian Brothers as it fulfils the congregation's pledge to complete its voluntary contributions.
"These payments ensure that Caranua has access to the full €110m in cash contributions which were committed to.
"Most importantly, the financial contributions will allow Caranua to continue its supports for survivors."
The Congregation of Christian Brothers has now voluntarily contributed a total of €30 million toward redress.
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