Most managers do not approve overtime because they want to pay more. They approve it because by the time a coverage gap is identified, there is no realistic alternative that moves fast enough. Calling a staffing agency at 4 p.m. and expecting a screened worker on the floor the next morning is not realistic with a reactive agency, so overtime gets approved and the cycle continues.
Reduce overtime with temp staffing only works when the staffing partner behind it can actually respond in time. That requires a pre-built, pre-screened candidate pipeline and not a recruiting process that starts after the request comes in. When candidates are already vetted, drug tested, and background checked, placement within one business day is achievable. That changes the math entirely.
When a manager knows a ready worker can be on the floor by the next morning, overtime becomes a choice rather than the only option. That is the difference a prepared staffing partner makes.