Synopsis As Introduced Amends the Illinois Income Tax Act. Creates the College Affordability Tax Credit in an amount equal to 5% of amounts spent during the taxable year for the tuition and fees of the taxpayer and any dependent of the taxpayer engaged in full-time or part-time undergraduate studies at any public or private college, university, community college, or degree granting proprietary institution located in Illinois. Provides that the taxpayer shall provide supporting documentation to receive the credit. Provides that the credit may not reduce the taxpayer's income tax liability to less than zero. Applicable to tax years ending on or after December 31, 2005. Sunsets the credit after 10 years. Effective immediately.