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Income Taxes
3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
A reconciliation of the U.S. federal statutory income tax rate to our effective income tax rate is as follows:
 For the Three Months Ended 
March 31,
 20222021
U.S. federal statutory income tax rate21.0 %21.0 %
State income taxes3.1 %2.8 %
Excess tax benefits from stock-based compensation-0.2 %-0.4 %
Other0.8 %0.1 %
Effective income tax rate24.7 %23.5 %

State income taxes

State income taxes include non-deductible expenses related to uncertain tax positions. The impact of these non-deductible expenses on our effective income tax rate for the three months ended March 31, 2022 increased from the same period in 2021 primarily due to an increase in the proportion of pre-tax income reserved for uncertain tax positions.

Excess tax benefits from stock-based compensation

We recognize an excess tax benefit or tax deficiency when the deduction for the stock-based compensation expense of a stock award for tax purposes differs from the cumulative stock-based compensation expense recognized in the financial statements. The excess tax benefit or tax deficiency is recognized in provision for income taxes in the period in which the amount of the deduction is determined, which is when restricted stock vests, restricted stock units are converted to common stock or stock options are exercised. Excess tax benefits reduce our effective income tax rate, while tax deficiencies increase our effective income tax rate. The impact of excess tax benefits on our effective income tax rate for the three months ended March 31, 2022 decreased from the same period in 2021 primarily due to a decrease in the number of restricted stock units that were converted to common stock during the first quarter of 2022 due to the timing of long-term stock award grants.

Other

Other items impacting our effective income tax rate primarily consist of non-deductible executive compensation expenses. The impact of other items on our effective income tax rate for the three months ended March 31, 2022 increased from the same period in 2021 primarily due to an increase in non-deductible executive compensation, which was primarily the result of stock options granted under our Amended and Restated Incentive Compensation Plan (the “Incentive Plan”). For additional information, see Note 14.