Tetra Tech Inc. reported net income of $247.9 million for the fiscal year ended September 28, 2025, a decrease of 25.6% compared to $333.4 million in the prior year. Income before income tax expense was $377.6 million, down 18.5% from $463.5 million in 2024. Income tax expense was $129.7 million, nearly unchanged from the $130.0 million in the previous year. Diluted earnings per share declined 24.4% to $0.93 from $1.23. Revenue grew by 4.7%, primarily driven by increased activity in U.S. state and local and federal government client sectors, with $80 million in revenue attributed to recent acquisitions. Excluding the impact of acquisitions, revenue increased 3.2% year over year. The company noted that recent changes in U.S. tax law resulted in a $0.4 million deferral in tax expense for fiscal 2025.