Bonus Depreciation and Enhanced Expensing for Small Businesses Extension Act of 2009

Bonus Depreciation and Enhanced Expensing for Small Businesses Extension Act of 2009 - Amends the Internal Revenue Code to extend through 2010: (1) the increased expensing allowance for depreciable small business assets (i.e., $250,000); (2) bonus depreciation for depreciable business property; and (3) the taxpayer election to accelerate alternative minimum tax and research tax credits in lieu of bonus depreciation. Sets forth special rules for taxpayers who previously elected acceleration of such credits and for those who did not.