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Income tax provision (Tables)
3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Effective income tax rate reconciliation
The effective tax rate on pretax income reconciles to the U.S. federal statutory tax rate as follows:

Quarter Ended March 31, 2022Year Ended December 31, 2021
Income tax at federal statutory rate21.0 %21.0 %
Change in valuation allowance100.4 %0.1 %
Tax impact of share-based compensation11.7 %0.9 %
State income tax expense, net of federal income tax benefit2.5 %2.4 %
Non-deductible executive compensation2.5 %1.7 %
Foreign tax rate differences1.7 %1.7 %
Tax on repatriation of foreign earnings1.4 %4.9 %
Non-deductible acquisition costs0.1 %1.5 %
Basis difference in Australian web hosting business(117.6 %)— 
Research and development tax credit(1.1 %)(0.9 %)
Other0.3 %(0.2 %)
Effective tax rate22.9 %33.1 %