Company: DLX
Filing Date: 2025-03-10
Form Type: DEF 14A
Source: 0000027996-25-000107
Chunk: 0

Company: DELUXE CORP
Filing Date: 2025-03-10
Form: DEF 14A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A
<div align='center'>Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No. )</div>

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

x Definitive Proxy Statement

¨ Definitive Additional Materials

¨ Soliciting Material under §240.14a-12

| Deluxe Corporation                                                       |
| (Name of Registrant as Specified In Its Charter)                         |
| (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant) |

| Payment of Filing Fee (Check the appropriate box): |     |                                                                                                     |
| x                                                  |     | No fee required.                                                                                    |
| ¨                                                  |     | Fee paid previously with preliminary materials:                                                     |
| ¨                                                  |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

### PROXY STATEMENT
and notice of annual meeting of shareholders

Thursday, April 24, 2025, at 3:00 p.m. Central Daylight Saving Time

www.virtualshareholdermeeting.com/DLX2025

#### A Letter from Our Independent Board Chair
| “The board and I sincerely appreciate the shareholder feedback we received, and we look forward to continued engagement over the coming year.” 
 Cheryl Mayberry McKissack                                                                                                                      
 Independent Chair                                                                                                                              |

Dear fellow shareholders,

On behalf of our Board of Directors, thank you for your continued investment in Deluxe and passion for our business. As we approach our Annual Meeting of Shareholders on April 24, 2025, I’d like to provide some updates on our 2024 results and longer-term strategy and the efforts we’ve undertaken to engage shareholders and continue our rigorous oversight of the business.

#### Shareholder Engagement
In 2024, we conducted a robust shareholder outreach campaign. Our board and management team value the feedback received from shareholders through our regular dialogue. We were disappointed by the relatively low investor support received on last year’s say on pay vote. In response, we proactively sought and thoughtfully