Pembrokeshire council is cutting its number of cabinet posts from 10 to eight to save money.
Council leader John Davies said cabinet members Peter Morgan and Sian James had agreed to step down in the new year.
Cabinet members receive an additional £14,756 on top of their basic allowance of £12,973.
Mr Davies said with the independent-run authority facing financial cuts the cabinet was "leading by example" in reducing its numbers and costs.
Mr Morgan had responsibility for communities and partnerships and Ms James had the portfolio for the voluntary sector, health and well-being.
Their work will be taken on by the eight remaining members.
The authority is run by a group of independent councillors.
"In the future, as the financial cuts bite, we will no doubt be expecting equal amounts of work - or more - to be done by less people," said Mr Davies, who receives an allowance of £29,513 as council leader.
"It is only right that the cabinet should practice what it preaches... by leading by example and reducing its numbers and costs.
"During their time in the cabinet both have made an invaluable contribution to the wellbeing of Pembrokeshire and I thank them for that."