Company: PAYX
Filing Date: 2025-04-08
Form Type: 424B2
Source: 0001193125-25-075170
Chunk: 2

Company: PAYCHEX INC
Filing Date: 2025-04-08
Form: 424B2
Chunk 2
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| Capitalization                                  |     |      | S-12  |
| Description of Notes                            |     |      | S-13  |
| U.S. Federal Income Tax Considerations          |     |      | S-27  |
| Underwriting                                    |     |      | S-31  |
| Legal Matters                                   |     |      | S-37  |
| Experts                                         |     |      | S-37  |

Prospectus

|                                                      |     | Page |    |
| About this Prospectus                                |     |      |  1 |
| Cautionary Note Regarding Forward-Looking Statements |     |      |  2 |
| About the Company                                    |     |      |  4 |
| Risk Factors                                         |     |      |  5 |
| Use of Proceeds                                      |     |      |  6 |
| Description of Debt Securities                       |     |      |  7 |
| Plan of Distribution                                 |     |      | 16 |
| Legal Matters                                        |     |      | 18 |
| Experts                                              |     |      | 18 |
| Where You Can Find More Information                  |     |      | 19 |
| Incorporation of Certain Documents by Reference      |     |      | 19 |

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ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement and the accompanying prospectus are each part of an automatic shelf registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the “SEC”) as a “well-known seasoned issuer” as defined in Rule 405 of the Securities Act of 1933, as amended (the “Securities
Act”). Under the shelf registration process, we may from time to time offer and sell to the public any or all of the debt securities described in the registration statement in one or more offerings. This document is in two parts. The first
part, which is this prospectus supplement, describes the specific terms of the notes we are offering and other matters relating to us. The second part, which is the accompanying prospectus, gives more general information about the various securities
we may offer from time to time, some of which may not apply to the notes offered by this prospectus supplement. Generally when we refer to the “prospectus supplement,” we are referring to both parts combined. This prospectus supplement may
add to, update or change the information in the accompanying prospectus. To the extent there is a conflict between the