A staffing agency incurs its biggest cost—payroll—the moment work is performed, usually paid weekly or bi-weekly. But the client that hired those workers pays on net-30, net-45, or net-60 terms. Growth makes this worse, not better: every new contract means more payroll to front before any invoice is collected. Banks are often slow or unwilling to fund this gap for younger agencies, which is why factoring is the dominant funding tool in staffing.
With factoring, the agency sells its approved invoices to a factor and receives most of the value immediately. Payroll gets covered, the agency can say yes to bigger accounts, and the factor waits to be paid by the end client. See how invoice factoring works in general for the full mechanics.