8.	Income taxes

We record our interim provision for income taxes based on our estimated annual effective tax rate, as well as certain items discrete to the current period. The effective tax rates for the three and nine month periods ended July 31, 2015 were 29.5% and 29.4%, respectively.

During the three months ended July 31, 2015, we recorded an adjustment related to our 2014 tax provision that reduced income taxes by $600.

On December 19, 2014, the Tax Increase Prevention Act of 2014 was enacted which retroactively reinstated the Federal Research and Development Tax Credit (Federal R&D Tax Credit) from January 1, 2014 to December 31, 2014 and extended certain other tax provisions. As a result, our income tax provision for the nine months ended July 31, 2015 included discrete tax benefits of $2,286 primarily related to 2014.

The effective tax rate for both the three and nine month periods ended July 31, 2014 was 29.5% and 30.1%, respectively. During the three months ended July 31, 2014, we recorded an adjustment related to our 2013 tax provision that reduced income taxes by $550. Additionally, we recorded a tax benefit of $500 related to an adjustment to deferred taxes resulting from a state income tax rate deduction.