Basis of Presentation	3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	NOTE 1 – BASIS OF PRESENTATION Basis of Presentation The accompanying consolidated financial statements are of ICF International, Inc. (“ICFI”) and its wholly-owned principal subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, the “Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. Intercompany transactions and balances have been eliminated. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and the reported amounts of revenue and expenses. Management evaluates these estimates on an ongoing basis including those that relate to revenue recognition (including estimates of variable considerations and remaining costs to complete fixed-price contracts), expected credit losses, valuation and lives of tangible and intangible assets acquired from business combinations, and reserves for tax benefits and valuation allowances on deferred tax assets. Actual results experienced by the Company may differ from management’s estimates. During the three months ended March 31, 2026 and 2025, the Company recognized net income of $0.4 million and $5.9 million, respectively, as a result of net changes in estimates related to fixed-price contracts accounted for under the percentage-of-completion method. Interim Results The unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). These rules and regulations permit some of the information and footnote disclosures normally included in annual financial statements, prepared in accordance with U.S. GAAP, to be condensed or omitted. In management’s opinion, the unaudited consolidated financial statements contain all adjustments that are of a normal recurring nature, necessary for a fair presentation of the results of operations and financial position of the Company for the interim periods presented. The Company reports operating results and financial data in as a single operating segment and reporting unit. Operating results for the three-month periods ended March 31, 2026 and 2025 are not necessarily indicative of the results that may be expected for the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the fiscal year ended December 31, 2025 and the notes thereto included in the Company’s Annual Report on Form 10-K. Recent Accounting Pronouncements Accounting Pronouncements Not Yet Adopted Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures In November 2024, the FASB issued ASU 2024-03: Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires additional disaggregation of certain costs and expenses. ASU 2024-03 specifically requires all public entities to disclose within a tabular format the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities in each relevant expense caption as well as certain amounts that are already required to be disclosed under current U.S. GAAP. ASU 2024-03 also requires public entities to disclose a qualitative description of the composition of any amounts in relevant expense captions that are not separately disaggregated and the amount and definition of the entity’s selling expenses. ASU 2024-03 will be effective for the Company for the annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, with early adoption permitted. The amendments may be adopted on a prospective or retrospective basis. The Company is currently evaluating the impact of the adoption of ASU 2024-03. Intangibles—Goodwill and Other—Internal-Use Software In September 2025, the FASB issued ASU 2025-06: Targeted Improvements to the Accounting for Internal-Use Software (“ASU 2025-06”), which modernizes the accounting for internal-use software costs by removing all references to software development project stages so that the guidance is neutral to different software development methods. ASU 2025-06 will be effective for the Company for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods, with early adoption permitted. The amendments may be adopted on a prospective, retrospective, or modified basis. The Company is currently evaluating the impact of the adoption of ASU 2025-06.

Basis of Presentation

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

NOTE 1 – BASIS OF PRESENTATION

Basis of Presentation

The accompanying consolidated financial statements are of ICF International, Inc. (“ICFI”) and its wholly-owned principal subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, the “Company”), and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”). ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. Intercompany transactions and balances have been eliminated.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and the reported amounts of revenue and expenses. Management evaluates these estimates on an ongoing basis including those that relate to revenue recognition (including estimates of variable considerations and remaining costs to complete fixed-price contracts), expected credit losses, valuation and lives of tangible and intangible assets acquired from business combinations, and reserves for tax benefits and valuation allowances on deferred tax assets. Actual results experienced by the Company may differ from management’s estimates.

During the three months ended March 31, 2026 and 2025, the Company recognized net income of $0.4 million and $5.9 million, respectively, as a result of net changes in estimates related to fixed-price contracts accounted for under the percentage-of-completion method.

Interim Results

The unaudited consolidated financial statements included in this Quarterly Report on Form 10-Q have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). These rules and regulations permit some of the information and footnote disclosures normally included in annual financial statements, prepared in accordance with U.S. GAAP, to be condensed or omitted. In management’s opinion, the unaudited consolidated financial statements contain all adjustments that are of a normal recurring nature, necessary for a fair presentation of the results of operations and financial position of the Company for the interim periods presented. The Company reports operating results and financial data in as a single operating segment and reporting unit. Operating results for the three-month periods ended March 31, 2026 and 2025 are not necessarily indicative of the results that may be expected for the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the fiscal year ended December 31, 2025 and the notes thereto included in the Company’s Annual Report on Form 10-K.

Recent Accounting Pronouncements

Accounting Pronouncements Not Yet Adopted

Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures

In November 2024, the FASB issued ASU 2024-03: Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires additional disaggregation of certain costs and expenses. ASU 2024-03 specifically requires all public entities to disclose within a tabular format the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities in each relevant expense caption as well as certain amounts that are already required to be disclosed under current U.S. GAAP. ASU 2024-03 also requires public entities to disclose a qualitative description of the composition of any amounts in relevant expense captions that are not separately disaggregated and the amount and definition of the entity’s selling expenses. ASU 2024-03 will be effective for the Company for the annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, with early adoption permitted. The amendments may be adopted on a prospective or retrospective basis. The Company is currently evaluating the impact of the adoption of ASU 2024-03.

Intangibles—Goodwill and Other—Internal-Use Software

In September 2025, the FASB issued ASU 2025-06: Targeted Improvements to the Accounting for Internal-Use Software (“ASU 2025-06”), which modernizes the accounting for internal-use software costs by removing all references to software development project stages so that the guidance is neutral to different software development methods. ASU 2025-06 will be effective for the Company for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods, with early adoption permitted. The amendments may be adopted on a prospective, retrospective, or modified basis. The Company is currently evaluating the impact of the adoption of ASU 2025-06.