Exhibit 99.1

For Immediate Release

Isabella Bank Corporation

401 N. Main Street

Mt. Pleasant, MI 48858

FOR MORE INFORMATION, CONTACT:

Mary Olivieri, Community Relations Officer

Phone: 989-779-6309 Fax: 989-775-5501

Isabella Bank Corporation Announces Third Quarter 2019 Dividend

Mt. Pleasant, Michigan, September 4, 2019 - Isabella Bank Corporation (OTCQX:ISBA), announced today that the Board of Directors of the Corporation declared a third quarter cash dividend of $0.26 per common share at its regular meeting held on August 28, 2019. The dividend will be payable on September 30, 2019 to shareholders of record as of September 26, 2019. Based on ISBA’s closing stock price of $22.25 per share as of August 28, 2019, the annual dividend yield is 4.67%.

“I am pleased to announce our Board approved a dividend of $0.26 per share for the third quarter,” commented Jae A. Evans, President and Chief Executive Officer of Isabella Bank Corporation. “We are committed to providing an attractive investment to our shareholders through dividends and strong financial results, as evidenced by our record earnings in the second quarter of this year.”

About the Corporation

Isabella Bank Corporation (OTCQX: ISBA) is the parent holding company of Isabella Bank, a state chartered bank headquartered in Mt. Pleasant, Michigan. Isabella Bank was established in 1903 and has been committed to serving the local banking needs of its customers and communities for 116 years. The Bank offers personal and commercial lending and deposit products, as well as investment, trust and estate planning services. The Bank has 30 banking locations throughout seven Mid-Michigan counties: Clare, Gratiot, Isabella, Mecosta, Midland, Montcalm, and Saginaw. The Corporation has been recognized on the Detroit Free Press list of “Top Workplaces” for five years.

For more information about Isabella Bank Corporation, visit the Investors link at www.isabellabank.com. Isabella Bank Corporation common stock is quoted on the OTCQX tier of the OTC Markets Group, Inc.’s electronic quotation system (www.otcmarkets.com) under the symbol “ISBA.” The Corporation's market maker is Boenning & Scattergood, Inc. (www.boenninginc.com) and its investor relations firm is Renmark Financial Communications, Inc.(www.renmarkfinancial.com).

Forward-Looking Statements

This press release includes forward-looking statements. To the extent that the foregoing information refers to matters that may occur in the future, please be aware that such forward-looking statements may differ materially from actual results. Additional information concerning some of the factors that could cause materially different results is included in the sections entitled "Risk Factors" and "Forward-Looking Statements" set forth in Isabella Bank Corporation's filings with the Securities and Exchange Commission, which are available from the Securities and Exchange Commission's Public Reference facilities and from its website at www.sec.gov.