As easy as it is – you only pay for what you need - and you need people. When the company hires employees on their payroll, the company covers all the commitments related to each worker – salary, insurance, onboarding, taxes, etc. While you work with the outstaffing agency, all of these duties are handled by the vendor directly. Clients pay only for the exact number of needed employees which have a fixed price.
Moreover, vendor’s cost coverage includes providing office spaces, software licenses, hardware and utilities, employee’s training, and their benefits. Not to mention relocation costs if your team is located in another city or country.