Yellis & Foley is an accounting and tax firm serving southern Maine and the surrounding Seacoast area from offices in Wells and South Portland. We provide our services to clients from a diverse array of industries, both at an individual and organizational level.

Our partners, Mark Yellis and Jim Foley, have worked in the accounting industry for more than fifty years combined. Their hallmarks are individualized advice, practically executable plans, and consistent, reliable performance for each and every client.

For more about their backgrounds, click here to read about Mark Yellis and click here to read about Jim Foley.

Yellis & Foley provides services including but not limited to the following. Contact us to learn more about how you can match our expertise with your needs.

Tax Strategy & Structuring

With the complexity of the tax code it can be easy to miss new tax incentives and other changes. At Yellis & Foley we remain consistently up-to-date with these alterations and tailor our approach for each client to maximize their tax savings and minimize their tax costs.

Financial Planning

During all of a client’s life stages, we call upon our decades of experience to advise best practices for their financial goals, whether in education savings, retirement planning, trust and estate structuring, or myriad other needs.

Reporting & Compliance

Through the preparation of your annual tax returns and other official documents, Yellis & Foley assures your adherence to applicable state and federal tax law.


In the case of an audit or other action from the IRS or other government agency, we provide the needed advocacy and support to ensure optimal resolution.

Accounting Technology Support

As the need for accounting technology arises for newly established organizations and those looking to change systems, we provide assistance with selection and initial setup and extend this with ongoing support that can be easily synthesized with your tax strategy.

Financial Statements & Monthly Reporting

For all reporting needs from compliance requirements to monthly bank statement reconciliation, Yellis & Foley has provided statement compilation, correction, and completion for hundreds of clients.

Management Consulting

Based on our partners’ combined decades of experience working in the industry, we also provide business-level consulting services for those particular needs that do not fit neatly into another category. Whether your goal is to improve organizational performance or explore relocation options, our expertise means you have a reliable outside perspective to be called upon when needed.