Married persons who file separately are barred from claiming certain tax credits, such as the adoption credit or education credits. However, there is no such bar for the low-income housing credit.
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.