Exhibit

EXHIBIT 5

Opinion of Counsel



Lansing 313 S. Washington Square Lansing MI 48933 Detroit 333 W. Fort Street - Suite 1400 Detroit MI 48226	Southfield 28411 Northwestern Highway, Suite 500 Southfield MI 48034 Holland 151 Central Avenue - Suite 260 Holland MI 49423	Grand Rapids 1700 E. Beltline NE - Suite 200 Grand Rapids MI 49525 St. Joseph 728 Pleasant Street - Suite 204 St. Joseph MI 49085



Walter S. Foster 1878-1961 Richard B. Foster 1908-1996 Theodore W. Swift 1928-2000 John L. Collins 1926-2001 Webb A. Smith Allan J. Claypool Gary J. McRay Stephen I. Jurmu Scott A. Storey Charles A. Janssen Charles E. Barbieri James B. Jensen, Jr. Scott L. Mandel Michael D. Sanders Brent A. Titus	Stephen J. Lowney Jean G. Schtokal Brian G. Goodenough Matt G. Hrebec Nancy L. Kahn Deanna Swisher Thomas R. Meagher Douglas A. Mielock Scott A. Chernich Paul J. Millenbach Dirk H. Beckwith Brian J. Renaud Bruce A. Vande Vusse Lynwood P. VandenBosch Lawrence Korolewicz James B. Doezema Anne M. Seurynck Richard L. Hillman Steven L. Owen John P. Nicolucci	Michael D. Homier David M. Lick Scott H. Hogan Richard C. Kraus Benjamin J. Price Frank T. Mamat Michael R. Blum Jonathan J. David Frank H. Reynolds Pamela C. Dausman Andrew C. Vredenburg John M. Kamins Jack A. Siebers Julie I. Fershtman Todd W. Hoppe Jennifer B. Van Regenmorter Thomas R. TerMaat Frederick D. Dilley David R. Russell Zachary W. Behler	Joshua K. Richardson Joel C. Farrar Laura J. Genovich Liza C. Moore Karl W. Butterer, Jr. Lisa J. Hamameh Mindi M. Johnson Ray H. Littleton, II Frank J. DeFrancesco Jack L. VanCoevering Barbra E. Homier Anna K. Gibson Patricia J. Scott Nicholas M. Oertel Alicia W. Birach Adam A. Fadly Michael J. Liddane Glen A. Schmiege Gilbert M. Frimet Mark J. Colon	Paul D. Yared Ryan E. Lamb Stephen W. Smith Clifford L. Hammond Brett R. Schlender Drew L. Block Mathew S. Fedor Nicolas Camargo Trevor J. Weston Liam K. Healy Andrea Badalucco John W. Mashni Allison M. Collins Leslie A. Dickinson Julie L. Hamlet Michael C. Zahrt Taylor A. Gast Rachel G. Olney Tyler J. Olney Mark J. DeLuca	Stefania Gismondi Thomas K. Dillon Robert A. Easterly Katila L. Howard David S. Nows Robert A. Hamor Michael A. Cassar Hilary J. McDaniel Toufic R. Saati Emily R. Wisniewski



Phone:	(517) 371-8100	Fax:	(517) 371-8200	Reply To:	Lansing	E-Mail:	mhrebec@fosterswift.com

August 6, 2018

Isabella Bank Corporation

401 N. Main St.

Mt. Pleasant, MI 48858

Ladies and Gentlemen:



RE:	Isabella Bank Corporation
	Registration Statement on Form S-3

You have requested our opinion as counsel to Isabella Bank Corporation, a Michigan corporation, in connection with a Registration Statement filed with the Securities and Exchange Commission under the Securities Act of 1933, as amended, on Form S-3. The Registration Statement relates to the offering of 500,000 shares of Isabella Bank Corporation common stock to be issued to stockholders in connection with the Isabella Bank Corporation Stockholder Dividend Reinvestment and Employee Stock Purchase Plan, as amended.

Based upon such examination and upon examination of such other instruments and records as we deem necessary, we are of the opinion that:

1. The Corporation has been duly incorporated under the laws of the state of Michigan, and is validly existing and in good standing under the laws of that state.

2. The 500,000 shares of common stock covered by the Registration Statement have been legally authorized; and when such shares have been duly delivered to stockholders against payment therefore as contemplated by the Isabella Bank Corporation Stockholder Dividend Reinvestment and Employee Stock Purchase Plan, such shares will be legally issued, fully paid and nonassessable.

This opinion is furnished for use as an Exhibit to the Registration Statement. We hereby consent to the filing of this opinion as an Exhibit to the Registration Statement and to the reference to us in the Prospectus under the heading “Legal Opinion”.

FOSTER, SWIFT, COLLINS & SMITH, P.C.

/s/ Foster, Swift, Collins & Smith, P.C.