Compass Management Consulting also warned that two thirds of outsourcing contracts worth more than £20 million were "unravelling" before the end of their contract terms.
The research, based on an analysis of 240 deals worth more than £20m, found that outsourcing providers were pricing contracts to produce savings of up 18% compared with in-house costs in the first year.
But costs then began to escalate, reaching 36% above comparable top quartile internal operations by year three.
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Top-tier outsourcing providers were charging an average of 30% – and sometimes as high as 45% – above in-house costs in the final years of the contract.
The providers' need to cover bidding costs, generate profits and cover risks and corporate overheads were raising contract prices, typically by 20% more than a well-performing in-house operation, Compass said.
Simon Scarrott, head of business development and marketing at Compass, said: "With those figures, it is easy to see why the claim that all outsourcing will save money is a myth. There can be sound strategic reasons for outsourcing but saving money over the long term is not one of them."
He added: "Outsourcing providers are not that different from an in-house operation. Indeed, they often use the same people as the in-house operation after the deal is signed and outsourcers cannot perform alchemy on a business process and turn an operation into gold."
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