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Income Taxes
 9 Months Ended
Sep. 30, 2023
Income Tax Disclosure [Abstract]  
Income Taxes
10. INCOME TAXES:
Quanta’s effective tax rates for the three months ended September 30, 2023 and 2022 were 22.1% and 31.8%. Quanta’s effective tax rates for the nine months ended September 30, 2023 and 2022 were 21.1% and 26.3%. The tax rates for the nine months ended September 30, 2023 and 2022 were favorably impacted by the recognition of $34.0 million and $22.7 million of benefits that resulted from equity incentive awards vesting at a higher fair market value than their grant date fair value. The effective tax rates for the three and nine months ended September 30, 2022 were unfavorably impacted by the valuation allowance on the losses on Starry, while the tax rates for the three and nine months ended September 30, 2023 include a benefit associated with the losses on Starry, as described further below. Additionally, the tax rates for the three and nine months ended September 30, 2023 reflect higher non-deductible per diem expenses related to the expiration, as of December 31, 2022, of a temporary provision that allowed the full deduction of certain meal and entertainment costs.
Quanta regularly evaluates valuation allowances established for deferred tax assets for which future realization is uncertain, including in connection with changes in tax laws. The estimation of required valuation allowances includes estimates of future taxable income. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Quanta considers projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income differs from these estimates, Quanta may not realize deferred tax assets to the extent estimated. During the three and nine months ended September 30, 2022, Quanta recognized $26.5 million and $76.5 million of unrealized losses on its investment in Starry and recorded a valuation allowance against such unrealized losses. During the three months ended March 31, 2023, Starry filed for bankruptcy under Chapter 11 of the U.S. Bankruptcy Code, as amended. On August 31, 2023, the equity securities held by Quanta were cancelled pursuant to an approved plan of reorganization in such bankruptcy proceeding. As a result, Quanta’s cumulative $91.5 million loss on its investment in Starry was realized during the three months ended September 30, 2023. This realized loss can be utilized to offset gains from tax years 2020 through 2023, and can be carried forward to offset future capital gains realized in tax years 2024 through 2028. Quanta has identified sufficient sources of capital loss carry backs and forecasted capital gain income in these periods such that the full $22.7 million valuation allowance on the Starry capital loss was released during the three months ended September 30, 2023.
As of September 30, 2023, the total amount of unrecognized tax benefits relating to uncertain tax positions was $49.3 million, a net increase of $7.7 million from December 31, 2022, which primarily resulted from a $7.7 million increase related to positions expected to be taken in 2023. Quanta’s consolidated federal income tax returns for tax years 2017 through 2022 remain open to examination by the IRS, as the applicable statute of limitations periods have not yet expired. Additionally, various state and foreign tax returns filed by Quanta and certain subsidiaries for multiple periods remain under examination by various U.S. state and foreign tax authorities. Quanta does not consider any state in which it does business to be a major tax jurisdiction. Quanta believes it is reasonably possible that within the next 12 months unrecognized tax benefits may decrease by up to $11.9 million as a result of settlement of these examinations or as a result of the expiration of certain statute of limitations periods.