Around 1,500 posts are to go at Kent County Council over the next four years, leader Paul Carter has announced.
Mr Carter said the move followed the cuts announced by the chancellor in the spending review - meaning the authority has to save £340m.
He said it was too early to say what exactly would be affected by the cuts and all services were being looked at.
Mr Carter told the BBC that as far as possible the council would maintain the “very best level of services to the general public” but there would be “less money after we’ve driven through the efficiencies in the organisation”.
“This is a real sledgehammer blow - we will have to look even deeper in the organisation than we have before,” Mr Carter said.
Kent CC employs 14,221 people - excluding all staff in schools - which is the full time equivalent of 10,259.