Traditionally, banks have been the major source of small business funding. Their principal role has been as a short-term lender offering demand loans, seasonal lines of credit, and single-purpose loans for machinery and equipment. Banks generally have been reluctant to offer long-term loans to small firms. The SBA guaranteed lending program encourages banks and non-bank lenders to make long-term loans to small firms by reducing their risk and leveraging the funds they have available. The SBA's programs have been an integral part of the success stories of thousands of firms nationally.

In addition to equity considerations, lenders commonly require the borrower's personal guarantees in case of default. This ensures that the borrower has a sufficient personal interest at stake to give paramount attention to the business. For most borrowers this is a burden, but also a necessity.