Company: ISBA
Filing Date: 2025-03-25
Form Type: DEF 14A
Source: 0000842517-25-000071
Chunk: 21

Company: ISABELLA BANK CORP
Filing Date: 2025-03-25
Form: DEF 14A
Chunk 21
---
 discretion, as set forth in the Retirement Bonus Plan.

<div align='center'>10</div>

Under the provisions of the Retirement Bonus Plan, participants are eligible for early retirement upon attaining 55 years of age. There is no difference between the calculation of benefits payable upon early retirement and normal retirement; however, the participant would not receive their full benefit under early retirement.

#### Nonqualified Deferred Compensation
Directors Plan. Under the Isabella Bank Corporation and Related Companies Deferred Compensation Plan for Directors (“Directors Plan”), directors, including named executive officers who serve as directors, are required to invest at least 25% of their board fees in our common stock and may invest up to 100% of their earned fees based on their annual election. These amounts are reflected in footnote 1 to the Summary Compensation Table. These stock investments can be made either through deferred fees or through the purchase of shares through the Isabella Bank Corporation Stockholder Dividend Reinvestment and Employee Stock Purchase Plan (“DRIP Plan”). Deferred fees, under the Directors Plan, are converted on a quarterly basis into stock units of our common stock based on the fair value of a share of our common stock as of the relevant valuation date. Stock units credited to a participant’s account are eligible for stock and cash dividends as paid. DRIP Plan shares are purchased pursuant to the DRIP Plan.

Distribution of deferred fees from the Directors Plan occurs when the participant retires from the Board or upon the occurrence of certain other events. The participant is eligible to receive distributions in the form of shares of our common stock of all of the stock units that are then in his or her account, and any unconverted cash will be converted to and rounded up to a whole share of stock and distributed, as well. Any common stock issued from deferred fees under the Directors Plan will be considered restricted stock under the Securities Act of 1933, as amended. Common stock purchased through the DRIP Plan are not considered restricted stock under the Securities Act of 1933, as amended.

SERP. Under the supplemental executive retirement plan (“SERP”), we may promise deferred compensation benefits to employees who are members of a select group of management or highly compensated employees, which may include the named executive officers. The SERP authorizes us to make annual and discretionary credits to a participant’s SERP account pursuant to a participation agreement with the participant that sets forth the amount and timing of any annual credits and the vesting, payment, and other terms to which the credits are subject.

The SERP provides default terms that