This report examines the current status, legislative history, and economic effects of the two expensing allowances (Section 179 and Bonus Depreciation Allowance) and also discusses initiatives in the 112th Congress to modify them. Expensing is the most accelerated form of depreciation for tax purposes. Section 179 of the Internal Revenue Code (IRC) allows a taxpayer to expense up to $125,000 of the total cost of new and used qualified depreciable assets it buys and places in service in 2012, within certain limits. In addition, Section 168(k) generally allows taxpayers to expense half the cost of qualified assets bought and placed in service in 2012.