Willdan Group, Inc. New Standards Disclosure

Accounting Pronouncements Recently Adopted

In July 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2025-05, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets” (“ASU 2025-05”). ASU 2025-05 allows an entity to elect a practical expedient to assume that current conditions as of the balance sheet date do not change for the remaining life of the asset in the development of a reasonable and supportable forecast as part of estimating expected credit losses. The amendments are effective for the annual reporting periods beginning after December 15, 2025, and interim periods within those fiscal year reporting periods beginning after December 15, 2025, with early adoption permitted. The Company elected to early adopt this standard in the fourth quarter of fiscal year 2025. The adoption of this standard did not have a material impact on the Company’s Consolidated Financial Statements.

In December 2023, the FASB issued ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). ASU 2023-09 amends the rules on income tax disclosures to require entities to disclose specific categories in the rate reconciliation, the income or loss from continuing operations before income tax expense or benefit (separated between domestic and foreign) and income tax expense or benefit from continuing operations (separated by federal, state, and foreign). In addition, ASU 2023-09 requires entities to disclose their income tax payments to international, federal, state, and local jurisdictions, among other changes. The amendments can be applied on a prospective basis although retrospective application is permitted. The amendments are effective for the annual reporting periods beginning after December 15, 2024, with early adoption permitted. The Company adopted ASU 2023-09 for its fiscal year 2025 annual reporting period, and as permitted by ASU 2023-09, the Company adopted this standard on a prospective basis. The adoption of this standard did not have a material impact on the Company’s Consolidated Financial Statements or disclosures.

Accounting Pronouncements Recently Issued

In December 2025, the FASB issued ASU No. 2025-12, “Codification Improvements” (“ASU 2025-12”). ASU 2025-12 addresses suggestions received from stakeholders on the Accounting Standards Codification and to make other incremental improvements to generally accepted accounting principles (“GAAP”). ASU 2025-12 provides changes to the Codification that (1) clarify, (2) correct errors, or (3) make minor improvements. The amendments are effective for the annual reporting periods beginning after December 15, 2026, and interim periods within those fiscal year reporting periods beginning after December 15, 2026, with early adoption permitted. The Company does not believe the amendments in ASU 2025-12 will have a material impact on its Consolidated Financial Statements.

In December 2025, the FASB issued ASU No. 2025-11, “Interim Reporting" (Topic 270): Narrow-Scope Improvements” (“ASU 2025-11”). The ASU 2025-11 amendments are intended to improve the guidance in Topic 270, Interim Reporting, by improving the navigability of the required interim disclosures and clarifying when that guidance is applicable. The amendments also provide additional guidance on what disclosures should be provided in interim reporting periods. The amendments are effective for the annual reporting periods beginning after December 15, 2027, and interim periods within those fiscal year reporting periods beginning after December 15, 2027, with early adoption permitted either (1) prospectively or (2) retrospectively. The Company does not believe the amendments in ASU 2025-11 will have a material impact on its Consolidated Financial Statements.

In November 2025, the FASB issued ASU No. 2025-09, “Derivatives and Hedging (Topic 815): Hedge Accounting Improvements” (“ASU 2025-09”). The ASU 2025-09 amendments are intended to simplify the application of hedge accounting and to more closely align hedge accounting with the economics of an entity's risk management activities in the following five areas: (1) similar risk assessment for cash flow hedges, (2) hedging forecasted interest payments on choose-your-rate debt instruments, (3) cash flow hedges of nonfinancial forecasted transactions, (4) net written options as hedging instruments, and (5) foreign-currency-denominated debt instrument as hedging instrument and hedged item (dual hedge). The amendments are effective for the annual reporting periods beginning after December 15, 2026, and interim periods within those fiscal year reporting periods beginning after December 15, 2026, with early

adoption permitted. The Company is currently evaluating the impact this update will have on its consolidated financial statements.

In September 2025, the FASB issued ASU No. 2025-06, “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal Software” (“ASU 2025-06”). ASU 2025-06 removes references to prescriptive and sequential software development stages which are referred to as “project stages” throughout Subtopic 350-40. The amendment introduces a principles-based approach to capitalization of internal-use software costs and requires capitalization of software costs to begin when management has authorized and committed to funding the project and it is probable the project will be completed and used to perform the intended function. The amendments do not change what internal-use software costs can be capitalized or when such capitalization ceases. The amendments are effective for the annual reporting periods beginning after December 15, 2027, and interim periods within those fiscal year reporting periods beginning after December 15, 2027, with early adoption permitted. The Company does not believe the amendments in ASU 2025-06 will have a material impact on its Consolidated Financial Statements.

In May 2025, the FASB issued ASU No. 2025-03, “Business Combinations (Topic 805) and Consolidation (Topic 810): Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity” (“ASU 2025-03”). ASU 2025-03 requires an entity involved in an acquisition transaction effected primarily by exchanging equity interests when the legal acquiree is a Variable Interest Entity (“VIE”) that meets the definition of a business to consider the factors in paragraphs 805-10-55-12 through 55-15 to determine which entity is the accounting acquirer, rather than defaulting to the conclusion that the primary beneficiary is always the acquirer. The amendments are effective for the annual reporting periods beginning after December 15, 2026, and interim periods within those fiscal year reporting periods beginning after December 15, 2026, with early adoption permitted. The Company does not believe the amendments in ASU 2025-03 will have a material impact on its Consolidated Financial Statements.

In November 2024, the FASB issued ASU No. 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40)” (“ASU 2024-03”). ASU 2024-03 requires entities to disclose, in the Notes to Consolidated Financial Statements, specified information about certain costs and expenses at each interim and annual reporting period. Specific disclosures include 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 (or other amounts of depletion expense) included in each relevant expense caption, as well as a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. Additionally, entities will need to disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. The amendments are effective for the annual reporting periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the impact this update will have on its consolidated financial statements.

In October 2023, the FASB issued ASU No. 2023-06, “Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative” (“ASU 2023-06”). ASU 2023-06 amends U.S. GAAP to reflect updates and simplifications to certain disclosure and presentation requirements referred to FASB by the Securities and Exchange Commission (“SEC”). The targeted amendments incorporate 14 of the 27 disclosures referred by the SEC into codification. Each amendment in ASU 2023-06 is effective on either the date on which the SEC’s removal of the related disclosure requirement from Regulation S-X or Regulation S-K becomes effective, or on June 30, 2027, if the SEC has not removed the requirements by that date. The Company does not believe the amendments in ASU 2023-06 will have a material impact in any of the Company’s current disclosures.