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9. Income Tax
3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Income Tax

Income tax expense during interim periods is based on applying an estimated annual effective income tax rate to year-to-date income, plus any significant unusual or infrequently occurring items which are recorded in the interim period. The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year and changes in tax law and tax rates.  The accounting estimates used to compute the provision for income taxes may change as new events occur, more experience is obtained, additional information becomes known, or as the tax environment changes.

 

Our effective tax rate for the quarter ended March 31, 2020 was 18.5%. The difference between the statutory federal income tax rate of 21.0% and our effective income tax rate results primarily from the federal Work Opportunity Tax Credit. This tax credit is designed to encourage employers to hire workers from certain targeted groups with higher than average unemployment rates. Other differences between the statutory federal income tax rate of 21.0% and our effective tax rate result from state income taxes, certain non-deductible expenses, and tax effects of stock-based compensation.