Results of Operations

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 6, 2025 DELUXE CORPORATION (Exact name of registrant as specified in its charter) 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) ( 651 ) 483-7111 Registrant's telephone number, including area code 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 1934 (§240.12b-2 of this chapter). ☐ Emerging growth company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Section 2 - Financial Information Item 2.02 Results of Operations and Financial Condition. Furnished as Exhibit 99.1 is the earnings release of Deluxe Corporation reporting results from second quarter 2025. The information in this Item 2.02 and Exhibit 99.1 shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed incorporated by reference into any filings under the Securities Act of 1933, as amended. Section 9 - Financial Statements and Exhibits Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit Number Description 99.1 Earnings Release, dated August 6, 2025, of Deluxe Corporation reporting results from second quarter 2025 (furnished) 101.INS XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document 101.SCH XBRL Taxonomy Extension Schema Document 101.LAB XBRL Taxonomy Extension Label Linkbase Document 101.PRE XBRL Taxonomy Extension Presentation Linkbase Document 104 Cover page interactive data file (formatted as Inline XBRL and contained in Exhibit 101) 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: August 6, 2025 DELUXE CORPORATION /s/ Jeffrey L. Cotter Jeffrey L. Cotter Senior Vice President, Chief Administrative Officer and General Counsel 3