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 fixed deduction allowed to every taxpayer, except those who may be claimed as a dependent by another person. Extra exemption deductions are allowed for a spouse on a joint return and for each qualifying dependent. A deduction of $3,400 is allowed for each exemption claimed on 2007 returns, but the deduction is phased out for certain high income individuals.