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Income Taxes
9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]  
Income Taxes

Note 8 — Income Taxes

Forrester provides for income taxes on an interim basis according to management’s estimate of the effective tax rate expected to be applicable for the full fiscal year. Certain items such as changes in tax rates and tax benefits related to disqualifying dispositions of incentive stock options are treated as discrete items and are recorded in the period in which they arise.

Income tax expense for the nine months ended September 30, 2014 was $5.0 million resulting in an effective tax rate of 40.7% for the period. Income tax expense for the nine months ended September 30, 2013 was $7.0 million resulting in an effective tax rate of 39.1% for the period. The increase in the effective tax rate during the nine months ended September 30, 2014 as compared to the prior year was primarily due to the recognition of $0.2 million in the nine months ended September 30, 2014 for potential additional tax expense resulting from an on-going U.S. state audit.