MASTEC INC

Note 10 –Income Taxes

In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The effect of significant discrete items is separately recognized in the quarter(s) in which they occur. For the three month periods ended March 31, 2025 and 2024, the Company’s consolidated effective tax rates were (37.8)% and 24.3%, respectively. The Company’s effective tax rate for the three month period ended March 31, 2025 included an income tax benefit primarily due to the reversal of uncertain tax position liabilities related to a state audit, offset, in part, by an increase in income tax expense due to higher pre-tax income. For the three month period ended March 31, 2024, the Company’s effective tax rate included the effect of an increase in non-deductible expenses as compared with the same period in the prior year.