NOTE A. PLAN DESCRIPTION

The following brief description of the Paychex, Inc. (the “Company” or “Paychex”) 401(k) Incentive Retirement Plan (the “Plan”) is provided for general information purposes only. More complete information regarding the Plan’s provisions may be found in the Plan Document and Summary Plan Description.

General: The Plan is a defined contribution plan qualified under Sections 401(a) of the Internal Revenue Code (the “Code”), which includes provisions under Section 401(k) allowing an eligible participant to direct the employer to contribute a portion of the participant’s compensation to the Plan on a pre-tax and/or after-tax basis through payroll deductions. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). The Plan was established on July 1, 1984 and has been restated or amended several times, the latest being in December 2025, to make certain changes and enhancements to the Plan.

The Plan operates in part as an employee stock ownership plan (“ESOP”), which is designed to comply with Section 4975(e) and the regulations under the Code. It is not currently intended that the Plan be a leveraged ESOP, although the Plan permits the ESOP to borrow money to purchase ESOP stock if the employer should so elect at some future date. As of December 31, 2025 and 2024, all shares of ESOP stock are allocated to participant accounts. Under this ESOP feature, participants are able to receive dividends on their shares of Paychex common stock in the form of cash or have them reinvested into the Paychex ESOP Stock Fund (“ESOP Fund”).

Plan Administration: The Plan is administered by the Paychex, Inc. 401(k) Incentive Retirement Plan Committee (the “Plan Committee”), which is appointed by the Vice President, Chief Human Resources Officer and approved by the Board of Directors of Paychex. The Plan’s trustee and record keeper is Fidelity Management Trust Company (“Fidelity”), who is also the trustee for the ESOP Fund. Fidelity was responsible for the custody and management of the Plan’s assets for the periods noted.

Plan Amendments: The Plan was amended once in 2025 to enhance its safe harbor matching contribution formula and to accommodate the transfer of certain assets and liabilities related to employee benefit plans of companies recently acquired by Paychex. The Plan was also amended three times in 2024 to accommodate the transfer of certain assets and liabilities of an immaterial business acquisition, to incorporate other administrative changes, and to restate and amend the Plan.

Plan Acquisitions: In April 2025, the Company acquired Paycor HCM, Inc. ("Paycor"). Paycor sponsored a 401(k) plan for the benefit of its employees (the "Paycor Plan"). On January 1, 2026, approximately 2,700 participants of the Paycor Plan became participants in the Plan and on April 15, 2026, Paycor Plan assets were transferred to the Plan. Service time recognized under the Paycor Plan will be recognized for employer match eligibility and vesting purposes under the Plan. The increase in net assets available for benefits resulting from participant reinvestments and loan transfers into the Plan was approximately $255,820,000. On April 27, 2026, the Plan completed the transfer of certain assets and liabilities from an immaterial business acquisition. The increase in net assets available for benefits resulting from participant reinvestments into the Plan was approximately $3,506,000.

In July 2023, the Company acquired Alterna Capital Solutions LLC (“Alterna”). On January 1, 2024, participants of the Alterna 401(k) Plan ("Alterna Plan") became participants in the Plan and in March 2024, Alterna Plan assets were transferred to the Plan. Service time recognized under the Alterna Plan is recognized for employer match eligibility and vesting purposes under the Plan. The increase in net assets available for benefits resulting from participant reinvestments and loan transfers into the Plan were approximately $2,085,000.

Eligible Employees: All new employees of the Company and its participating subsidiaries are eligible to participate in the salary deferral portion of the Plan immediately. Employees must be employed for one year in which a minimum of 1,000 hours have been worked to be eligible to receive a Company matching contribution, when such matching contribution is in effect.

Contributions: Employees may contribute, on a pre-tax basis and/or on an after-tax basis, from 1% up to 50% of their compensation through payroll deductions in increments of 1%, subject to the limitations established by the Code. For the Roth 401(k), employees may only contribute on an after-tax basis, subject to these same limitations. The maximum allowable annual employee contribution to the Plan was $23,500 and $23,000 for the calendar years ended December 31, 2025 and 2024,

NOTE B. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

NOTE C. FAIR VALUE MEASUREMENTS

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The accounting standards related to fair value measurements include a hierarchy for information and valuations used in measuring fair value that is broken down into three levels based on reliability, as follows:

The carrying value of cash approximates its fair value due to the short maturity of this financial instrument. Notes receivable from participants are valued at the principal amount plus accrued interest, which approximates fair value. Mutual funds and Paychex common stock, which is the sole investment in the ESOP Fund, are stated at their approximate fair value based on quoted market prices in active markets.

Collective investment trusts ("CITs") are valued at either fair value, if the trust's NAV is published on a public stock market, or the trust's unpublished NAV, which approximates fair value. There are no redemption restrictions or unfunded commitments in the CITs offered under the Plan. The Annuity Fund, ClearCourse, is valued by Genworth Life and Annuity Insurance Company using the quoted market price of the underlying investments less applicable ClearCourse asset charges. The underlying investments are in the GE Investment Funds, Inc. Total Return Fund Class 2.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

NOTE D. RISKS AND UNCERTAINTIES

The Plan provides certain investments that are exposed to various risks, such as interest rate risk, credit risk, and market volatility risk. The Plan attempts to limit these risks by authorizing and offering participants a broad range of investment options that are invested in high quality securities or are offered and administered by reputable and known investment and insurance companies. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in values of investment securities will occur in the near term, and such changes could materially affect the amounts reported in the Statements of Net Assets Available for Benefits and the Statements of Changes in Net Assets Available for Benefits.

The Plan’s exposure to a concentration of risk is limited by the diversification of investments across 29 participant-directed fund elections. Additionally, the investments within each participant-directed fund election are further diversified into varied financial instruments, with the exception of the ESOP Fund, which invests in a single security and cash.

NOTE E. RELATED PARTY TRANSACTIONS

The Plan’s holdings of Paychex common stock qualify as party-in-interest transactions. As of December 31, 2025, the Plan held 1,529,093 shares of Paychex common stock at a fair market value of $171,533,653. As of December 31, 2024, the Plan held 1,647,522 shares of Paychex common stock at a fair market value of $231,015,535.

NOTE F. TAX STATUS

The Plan received a determination letter from the Internal Revenue Service (“IRS”) dated December 1, 2017, stating that the Plan, and amendments through January 16, 2017, is qualified under Section 401(a) and Section 4975(e) of the Code and, therefore, the related trust is exempt from taxation. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan Committee believes the Plan is being operated in compliance with the applicable requirements of the Code and, therefore, believes that the Plan, as amended, is qualified and the related trust is tax exempt.

The preparation of financial statements in conformity with U.S. GAAP requires the Plan Committee to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS.

The Plan Committee has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2025, there are no uncertain positions taken or expected to be taken that would require recognition of a liability (or asset) or disclosure in the financial statements. Therefore, the Plan has recognized no interest or penalties related to uncertain tax positions. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress.

NOTE G. RECONCILIATION OF FINANCIAL STATEMENTS TO IRS FORM 5500