S.2552: A bill to amend the Internal Revenue Code of 1986 to provide a stimulus to small business by increasing expensing for small businesses in 2008, extending the length of the carryback period for net operating losses during 2007 and 2008, and extending the research and development credit.

Small Business Stimulus Act of 2008 - Amends the Internal Revenue Code to: (1) increase to $200,000 the expensing allowance for depreciable business assets in 2008; (2) extend through 2008 the five-year carryback allowed for certain unused net operating losses; and (3) extend through 2008 the tax credit for increasing research activities.