Control capital costs. Cost-cutting may not be the only reason to outsource, but it's certainly a major factor. Outsourcing converts fixed costs into variable costs, releases capital
Increase efficiency. Companies that do everything themselves have much higher research, development, marketing, and distribution expenses, all of which must be passed on to customers. An outside provider's cost structure and economy of scale can give your firm an important competitive advantage.
Reduce labor costs. Hiring and training staff for short-term or peripheral projects can be very expensive, and temporary employees don't always live up to your expectations. Outsourcing lets you focus your human resources where you need them most.