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Income Taxes
9 Months Ended
Sep. 27, 2020
Income Tax Disclosure [Abstract]  
Income Taxes
8. INCOME TAXES
Our effective tax rate may vary from the U.S. federal statutory tax rate due to the change in the mix of earnings in tax jurisdictions with different statutory rates, benefits related to tax credits, and the tax impact of non-deductible expenses and other permanent differences between income before income taxes and taxable income. The effective tax rates for Q3 2020 and YTD 2020 were 16.8% and 28.4%, respectively. In Q3 2020, the variance from the U.S. federal statutory tax rate of 21% was primarily attributable to the mix of earnings in jurisdictions with lower statutory tax rates than the U.S. federal statutory tax rate, such as in Singapore and the United Kingdom, and discrete tax benefits due to prior year tax adjustments and uncertain tax positions. In addition to the items noted above, the variance from the U.S. federal statutory tax rate for YTD 2020 was primarily attributable to discrete tax expense of $62 million related to the valuation allowance recorded against the deferred tax asset for California research and development credits, and discrete tax expense of $28 million related to the finalization of the Altera court case which determined stock-based compensation must be included in intercompany cost sharing payments, partially offset by discrete tax benefits related to the derivative assets recorded as a result of the terminated PacBio acquisition and tax benefits related to share-based compensation.