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Our response to COVID-19.

Defined by compassion and understanding. Backed by a commitment to outstanding service.

At Coston & McIsaac, CPAs, our response to the COVID-19 outbreak is built on compassion and the expertise of our staff to provide outstanding service.  We are focused on meeting your needs and providing support to each client who relies on our advice and services.  Before, during and after the pandemic. We are here for you.


Thank you for visiting our website.

Coston and McIsaac, CPAs is a full-service accounting firm serving clients throughout Eastern Maine. We are dedicated to providing our clients with professional, personalized services and guidance in a wide range of financial and business needs. Our mission is to help our clients succeed, while honoring our obligation to the public, all within the framework of the standards of our profession.

On this website, you will find information about Coston and McIsaac, CPAs, including our list of services. We have also provided you with online resources to assist in the tax process and financial decision-making. These tools include downloadable tax forms and publications, financial calculators, news and links to other useful sites. Whether you are an individual or business in or around Bar Harbor, Coston and McIsaac, CPAs has years of valuable experience assisting professionals with their accounting and tax needs.

We welcome any questions or comments you may have. Feel free to contact us at any time. To schedule an appointment please call the office. Please do NOT email any solicitations via our web portal or email.

Coston and McIsaac, CPAs

38 Rodick St.
Bar Harbor, ME 04609

Telephone: (207) 288-9458
Fax: (207) 288-2234

You can also send us a message directly through the Contact page of this website.