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Income Taxes | 3 Months Ended
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Mar. 31, 2024
Income Tax Disclosure [Abstract] |
Income Taxes |
7. Income Taxes
We estimate our annual effective tax rate to be 23.8% for the full year 2024, which differs from the U.S. federal statutory rate due to state and foreign income taxes and nondeductible executive compensation, partially offset by federal tax credits generated. Our negative effective tax rate of 10.5% for the three months ended March 31, 2024 was primarily due to income tax expense from normal, recurring operations, offset by tax benefits recognized for share-based compensation for employees, net of disallowed executive compensation, and the Verily milestone payment. The Organization for Economic Co-operation and Development has a framework to implement a global minimum corporate tax of 15% for companies with global revenues and profits above certain thresholds (referred to as Pillar 2), with certain aspects of Pillar 2 effective January 1, 2024 and other aspects effective January 1, 2025. While it is uncertain whether the United States will enact legislation to adopt Pillar 2, certain countries in which we operate have adopted legislation, and other countries in which we operate are in the process of introducing legislation to implement Pillar 2. We have assessed the impact of Pillar 2 and the impact is immaterial. In January 2024, the California Franchise Tax Board commenced an audit of our California income tax returns for the 2020 and 2021 years primarily related to our research and development tax credit carryforwards. We do not expect any significant adjustments as a result of the audit.

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