Back-End Income

What does Back-End Income mean in American Law?

The definition of Back-End Income in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

A real estate term for taxable income created when previous deductions (especially for depreciation) taken with respect to a piece of real property must be “reversed” because the property is voluntarily or involuntarily disposed of before the mortgage on it is fully amortized.