Company: ADP
Filing Date: 2025-05-07
Form Type: 424B2
Source: 0001193125-25-114878
Chunk: 26

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-05-07
Form: 424B2
Chunk 26
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 Global Notes among participants of DTC, Clearstream and Euroclear, they are under no obligation to perform or continue to perform such procedures and such procedures may be discontinued at any time. Applicable Law The Notes and the indenture will be governed by and construed in accordance with the laws of the State of New York. Additional Terms For additional important information about the Notes, see “Description of Debt Securities” in the accompanying prospectus. That information includes:

| • |     | additional information on the terms of the Notes; |

| • |     | general information on the indenture and the trustee; and |

| • |     | a description of events of default under the indenture. |

To the extent any information about the Notes varies between this prospectus supplement and the accompanying prospectus, you should rely on the information contained in this prospectus supplement. S-20

MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES The following are the material U.S. federal income tax consequences of owning and disposing of Notes that are purchased in this offering at the “issue price,” which is the first price at which a substantial amount of the Notes is sold to the public, and are held as capital assets for U.S. federal income tax purposes. This discussion does not describe all of the tax consequences that may be relevant to you in light of your particular circumstances, including alternative minimum tax and Medicare contribution tax consequences, the application of Section 451 of the Code (as defined below) with respect to conforming the timing of income accruals to financial statements, as well as differing tax consequences that may apply if you are, for instance:

| • |     | a financial institution; |

| • |     | an insurance company; |

| • |     | a real estate investment trust; |

| • |     | a regulated investment company; |

| • |     | a dealer or trader in securities that uses a 
 mark-to-market method of accounting;         |

| • |     | holding Notes as part of a “straddle” or integrated transaction; |

| • |     | a U.S. Holder (as defined below) whose functional currency is not the U.S. dollar; |

| • |     | a tax-exempt entity; or |

| • |     | a partnership for U.S. federal income tax purposes. |

If you are a partnership for U.S. federal income tax purposes, the U.S. federal income tax treatment of your partners will generally depend on the status of the partners