Isabella Bank (ISBA) 10-Q 2023 Q1 Quarterly report

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Isabella Bank Corporation (the “Corporation”) on Form 10-Q for the quarterly period ended March 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Jae A. Evans, President and Chief Executive Officer and Neil M. McDonnell, Chief Financial Officer of the Corporation, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the consolidated financial condition and results of operations of the Corporation.

/s/ Jae A. Evans

President and Chief Executive Officer

(Principal Executive Officer)

April 28, 2023

/s/ Neil M. McDonnell

Chief Financial Officer

(Principal Financial Officer)

April 28, 2023