QUANTA SERVICES INC

10. INCOME TAXES:

Quanta’s effective tax rates for the three months ended March 31, 2024 and 2023 were a provision of 14.3% and a benefit of 3.7%. The tax rates for the three months ended March 31, 2024 and 2023 were favorably impacted by the recognition of $21.6 million and $32.0 million of benefits that resulted from equity incentive awards vesting at a higher fair market value than their grant date fair value.

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.

As of March 31, 2024, the total amount of unrecognized tax benefits relating to uncertain tax positions was $47.4 million, a net increase of $2.3 million from December 31, 2023, which resulted from positions expected to be taken in 2024. Quanta’s consolidated federal income tax returns for tax years 2017, 2018, and 2020 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 U.S. 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 $8.9 million as a result of settlement of these examinations or as a result of the expiration of certain statute of limitations periods.