An arrangement in which a party provides a firm with funds to cover any shortfalls arising from capital or cash flow restraints, allowing the company to service its debt. A deficiency agreement will usually have a cumulative limit specified by the lending party. While a deficiency agreement will cover an entire company, it may be specified to protect a smaller aspect of the business. To prevent the project from failing, a deficiency agreement could provide it with enough cash until a revenue stream is established.