South Bucks council has awarded a contract worth £11m for back office services including ICT to Steria and Northgate.
According to a notice published in the Official Journal of the European Union on 31 May, the suppliers will deliver a wide range of services including accounting services, software implementation and maintenance as well as hardware and consultancy.
The district council's new outsourcing deal will only retain functions in-house where contracting out is not permitted, such as fraud prevention and detection.
Revenue and benefits also form part of the seven year deal, covering the billing, collection and recovery of council tax and benefits.