Members of Chartered Accountants Ireland and CPA Ireland have voted in favour of a proposal to amalgamate the two institutes.
Between them, the institutes - which are the only two Irish-based accountancy bodies - have 37,000 members.
The two Irish-based accountancy bodies will now work to implement the decision of their members, which will see the creation of a single institute operating under the Chartered Accountants Ireland brand.
The proposal to merge had been endorsed by the councils of both institutes, who said they believe it will better position the profession for the future, while it will drive new growth opportunities and will mean they are stronger to meet challenges.
Sinead Donovan, President of Chartered Accountants Ireland, and Mark Gargan, President of CPA Ireland, said they were pleased that members had seen the benefits of the proposal.
Sinead Donovan said the result was a vote of confidence in the future.
"Thanks to every member who engaged with us along the way and who turned out to vote in such numbers. Our work continues now to secure the legal and regulatory consents needed to deliver on this mandate for a stronger profession," she said.
Mark Gargan, President of CPA Ireland, said that as one single institute, they will be more strongly positioned to represent members, to promote the profession and to be a positive voice representing the public interest.
"The move towards consolidation of professional membership organisations is gaining momentum globally, and Ireland will be a model for other professional bodies in this regard," he added.
The two organsiations had attempted to merge earlier, with previous attempts in the late 1990s and again in the early 2000s.
