An estimated 2,000 jobs will need to be cut to balance the books at Derbyshire County Council after government grant cuts of 28% were put in place.
The council said it was looking at the cuts to make savings of £84m in the next four years.
The savings are in addition to the £10m that the council already needed to save this year.
Conservative council leader Andrew Lewer said the exact impact on jobs would not be known until December.
"We're still waiting for final information on government grant and assessing inflation. Council tax levels also still have to be determined," Mr Lewer said.
Some estimated job losses would be achieved through job turnover, retirement and other measures, but some compulsory redundancies would also be necessary, the council said.
Council Labour leader Ann Western said the cuts could rise causing even more job losses.
"This is not an even amount of cuts across the four years but is going to be considerably more in the first year which makes it much more difficult to manage," she said.