BYLINE BANCORP, INC. New Standards Disclosure

The following reflect recent accounting pronouncements that were adopted and are pending adoption by the Company.

Adopted Accounting Pronouncements

Income Taxes – Improvements to Income Tax Disclosures (Topic 740) – In December 2023, the FASB issued ASU 2023-09 to provide additional transparency into an entity’s income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The standard requires that public business entities disclose, on an annual basis, specific categories in the rate reconciliation and additional information for reconciling items meeting a certain quantitative threshold. The amendments also require that entities disclose on an annual basis: 1) income taxes paid (net of refunds received) disaggregated by federal (national), state, and foreign taxes and 2) the income taxes paid (net of refunds received) disaggregated by individual jurisdictions exceeding 5% of total income taxes paid (net of refunds received). The amendments are effective for public business entities for annual periods as of December 31, 2025. The Company has evaluated and included the supplemental disclosure requirements in Note 11 – Income Taxes and concluded that the requirements did not have a material impact to the consolidated financial statements.

Issued Accounting Pronouncements Pending Adoption

Financial Instruments – Credit Losses (Topic 326) – Purchased Loans – In November 2025, the FASB issued ASU 2025-08 to change the accounting for certain acquired purchased seasoned loans ("PSL") by applying the gross‑up method, which records an allowance for expected credit losses at acquisition as an adjustment to amortized cost basis rather than a Day 1 provision through earnings. The guidance is intended to simplify post‑acquisition accounting, reduce inconsistency between PCD and non-PCD loans, and eliminate Day 1 credit loss expense for in‑scope PSLs. The amendments are effective for public business entities for annual periods beginning after December 15, 2026, with early adoption permitted. As of January 1, 2026, the Company adopted this guidance on a prospective basis. Early adoption will eliminate Day 1 credit loss expense on eligible purchased loans and provide consistency in accounting with PCD loans.

Derivatives and Hedging (Topic 815) – Hedge Accounting Improvements – In November 2025, the FASB issued ASU 2025-09 to better align hedge accounting with entities’ risk management activities. Key amendments include expanding the ability to group forecasted transactions with similar (rather than identical) risk exposure, establishing a model for hedging interest payments on choose‑your‑rate debt, expanding hedge accounting for certain forecasted nonfinancial transactions, and updating guidance on net written options and foreign‑currency‑denominated debt. The amendments are effective for public business entities for annual periods beginning after December 15, 2026, with early adoption permitted. As of January 1, 2026, the Company adopted this guidance to provide additional flexibility in forecasting future hedge transactions.

Income Statement (Topic 220) – In November 2024, the FASB issued ASU 2024-03, Income Statement (Topic 220) – Reporting Comprehensive Income – Expense Disaggregation Disclosures; to address requests from investors for more detailed information about certain expense types. The standard requires that public business entities to disclose disaggregated information about specific relevant natural expense categories underlying certain income statement expense line items. The ASU requires entities to disaggregate any relevant expense caption presented on the face of the income statement within continuing operations into the following required natural expense categories, as applicable: (1) purchases of inventory, (2) employee compensation, (3) depreciation, (4) intangible asset amortization, and (5) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities or other depletion expenses. The amendments are effective for public business entities for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. In January 2025, the FASB issued ASU 2025-01 to amend the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Entities are required to adopt prospectively. The Company is evaluating the accounting and disclosure requirements of this update and does not expect them to have a material effect on the consolidated financial statements.