Wiltshire Council is planning an extra £30m in cuts next year, it has been announced.
The authority had pencilled in £40m in cuts next year, but after new information from central government that figure has now gone up to £70m.
Following Chancellor George Osborne's Comprehensive Spending Review last month Wiltshire Council said it aimed to save £122m in four years.
An extra £30m of that total will now have to be made in 2011/12.
'Worst case scenario'
Council finance member Fleur De Rhe-Philipe said extra job losses were "not the plan at the moment".
She added: "We may have to slow down our ambitious investment programme.
"Totally changing our collection and disposal of waste - things like that."
A council spokeswoman said precise figures would not be known before December, but they were working on the "worst case scenario".
The Conservative-run council has said it aims to close 240 managerial posts by next April.