Small Business Expensing Expansion and Permanency Act of 2007

Small Business Expensing Expansion and Permanency Act of 2007 - Amends the Internal Revenue Code to: (1) increase the expensing allowance (i.e., a tax deduction in the current taxable year) for small business assets to $200,000 and make such allowance permanent; (2) increase the threshold for phaseout of such allowance to $800,000 (cost basis of property placed in service); (3) allow an inflation adjustment to the expensing and threshold amounts beginning after 2007; (4) make permanent the right of a taxpayer to revoke an election to expense; and (5) make permanent the inclusion of certain computer software as property eligible for expensing.