RTÉ's Chief Financial Officer (CFO) Richard Collins has resigned.
In a statement, RTÉ said Mr Collins would work on a handover and that it is in the process of identifying a replacement CFO.
"Richard will assist in any ongoing processes to the extent that this may be required," RTÉ said.
"We wish to thank Richard for his hard work and contribution to RTÉ over the past three years and to wish him every success in the future."
Minister for Media Catherine Martin said that she was aware that Mr Collins was likely to be leaving but that she does not have a role in internal staffing matters in RTÉ.
At a post-budget briefing, the minister said that the fall in licence fee revenue could cost RTÉ €61 million over this year and next year.
The figure was identified by the Government advisory agency NewERA which has recommended €40m in additional funding for RTÉ to cover some of the shortfall.
The minister said that money will not be paid until she has seen a strategic plan from the broadcaster which is due to be completed in the coming weeks.
Ms Martin confirmed at the briefing that RTÉ will receive €16m in additional funding.
RTÉ has been hit with a sharp fall in TV licence fee revenue following revelations in June over the under-declaration of Ryan Tubridy's salary.
Mr Collins was among the RTÉ executives grilled by politicians at Oireachtas committee hearings following revelations over the under under-declaration of Mr Tubridy's salary.
When Kevin Bakhurst took up his role as RTÉ Director General in July, he stood down the organisation's Executive Board and appointed an interim leadership team that did not include Mr Collins.
Mr Bakhurst held a meeting with RTÉ staff today to update them on developments at the organisation.
The "town hall" meeting also gave employees an opportunity to ask questions about management's future plans.
Last month, Mr Bakhurst announced a recruitment freeze and a pause in discretionary spending at the broadcaster.
He and his management team are currently developing a strategic framework for the future of RTÉ, which is due to be completed in the coming weeks.
It is understood from sources who attended today's staff meeting that Mr Bakhurst said that RTÉ will be a "smaller organisation", but that there will be no compulsory redundancies.
He said that there may have to be a voluntary exit scheme, which would be outlined in the strategy.
On the possible sale of the Donnybrook site, Mr Bakhurst said he does not believe it makes financial sense to move "wholesale from Donnybrook", but all options will be looked at.
He said the most likely scenario is that RTÉ stays on the site, but shrink its footprint on the land.
