The interest rates paid on overpayments and underpayments remain the same in the fourth quarter of 2010 as they have been all year. Individuals will pay 4% on underpayments and receive interest of 4% on overpayments during this period. This rate has been in effect since April 1, 2009.
Source: Rev. Rul. 2010-21; 2010-39 IRB 1
A statutory term describing the cost used to determine your profit or loss from a sale or exchange of property. It is generally your original cost, increased by capital improvements, and decreased by depreciation, depletion, and other capital write-offs.