EXHIBIT 23.1

                        CONSENT OF INDEPENDENT REGISTERED
                             PUBLIC ACCOUNTING FIRM

Board of Directors
IBT Bancorp, Inc.

We consent to the incorporation by reference in the proxy statement-prospectus
included in this Registration Statement on Form S-4 of IBT Bancorp, Inc. of our
report dated March 2, 2007, which appears on pages 40-41 on Form 10-K for the
year ended December 31, 2006, and to the reference to our Firm under the caption
"Experts" in the proxy statement-prospectus.

                                                     /s/ REHMANN ROBSON, P.C.


Saginaw, Michigan
October 12, 2007