Company: DLX
Filing Date: 2025-10-31
Form Type: 8-K/A
Source: 0000027996-25-000185
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Company: DELUXE CORP
Filing Date: 2025-10-31
Form: 8-K/A
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
<div align='center'>Washington, D.C. 20549</div>

#### FORM 8-K/A
<div align='center'>(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 20, 2025</div>

### DELUXE CORPORATION
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| MN                           |     | 1-7945       |     | 41-0216800          |
| (State or other jurisdiction |     | (Commission  |     | (I.R.S. Employer    |
| of incorporation)            |     | File Number) |     | Identification No.) |

| 801 S. Marquette Ave.,Minneapolis,MN     |     | 55402-2807 |
| (Address of principal executive offices) |     | -Zip Code  |

<div align='center'>( 651) 483-7111

Registrant's telephone number, including area code</div>

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                     |     | Trading symbol(s) |     | Name of each exchange on which registered |
| Common stock, par value $1.00 per share |     | DLX               |     | NYSE                                      |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 193