Cuts to the coming year's budget in South Gloucestershire have been agreed by the council.
Councillors said savings of £9m over 2011-12 would need to be made and have set the budget at almost £196m for the next financial year.
The Conservative-led authority said it had also decided to freeze council tax.
More than 300 jobs are expected to be lost over the next two years in what the council described as "back-office posts".
The council has about 3,000 non-school staff full-time equivalent posts and the 317 posts affected do not include people employed in the area's schools.
It said it hoped to reduce the number of senior managers by a third which it hoped would save about £2m.
The £196m budget includes spending £2.7m on services for older people and £30m on improving schools and facilities for young people.