term:

Deficiency

deficiency n

pl: -cies
: an amount that is lacking or inadequate: as
a : the difference between the amount of tax owed and the amount of tax paid
b : the difference between the amount owed under a security agreement and the amount the creditor is able to recover upon default of the debtor by selling the collateral

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.