Where Nonprofits
Go for Help.

Your Cause is Our Cause.

Meeting your needs has been our expertise for a long time. We have a century of nonprofit experience with over 400 associations, charities and private and community foundations across the region. We know that finances, like nonprofit accounting, are central to your work, and we have seasoned experts committed to helping you help others.

Maner Costerisan values relationships just as much as continuing to master their area of expertise. Customers can rely on employees contributing to their mission by attending events, subscribing to newsletters, following social media, and asking questions to learn more about new initiatives.  It’s what sets the MC Team apart.

Tammy Hannah, University Rehabilitation Alliance, Inc.

We are a relatively complex organization and Maner understands us and gives counsel at the strategic level so we can make decisions that help us be good stewards of our members’ investment.

Rob Fowler, Michigan Celebrates Small Business

Maner responds to my concerns or questions quickly and I always feel they do their due diligence before giving me an answer.

Michele Brand, Michigan Protection & Advocacy Service Inc.

Experts with a Mission.

We have made a commitment to the nonprofit community, serving nonprofits of all shapes, sizes and missions. We understand your challenges around nonprofit funding, nonprofit budgeting, membership, technology and resources. And we have a dedicated team with the industry expertise and strong partnerships to ensure your success and that of those who depend on you.

Community Networking & Resources

Single Partner with Tremendous Resources

Industry Expertise & Connections

Maner Team Expert

Sarah Jennings, CPA, CFE, CAE, Principal, Director, Consulting

Sarah is a principal in Maner Costerisan’s Accounting and Outsourced Solutions department. She leads the firm’s Fraud and Forensics practice and its Nonprofit team. Sarah oversees outsourced solutions engagements providing guidance and advisory services to client leadership and teams on financial analysis, projections and workflow. She has a particular specialization in performing fraud risk assessments and internal control process improvements for organizations across various industries. Sarah maintains a strong desire to help her clients augment their internal controls and fraud prevention systems while minimizing their costs in the process. Sarah also performs examinations for various organizations to determine and document the extent of loss due to fraud.

Sarah is leading our firm’s initiatives in innovation and community engagement involving many internal team members as well as community leaders and stakeholders. This increased focus is an exciting representation of Maner Costerisan’s concentration on its’ corporate social responsibility.

Beyond her client responsibilities at Maner Costerisan, Sarah regularly shares her expertise with colleagues and peers by speaking on industry-related topics including fraud (risk areas and prevention), financial oversight, board governance and ethics.

Sarah volunteers her time with various charitable organizations primarily focused on leadership and entrepreneurism.

Sarah resides in Laingsburg, Michigan with her husband, Russ, and their son, Kannon. In her free time, she enjoys gardening, cooking and playing golf.


I am dedicated not only to the task my clients have engaged me with, but also to helping their organizations succeed and thrive overall.

Years of Experience



American Institute of Certified Public Accountants (AICPA)

Michigan Association of Certified Public Accountants (MICPA)

Association of Certified Fraud Examiners

Lansing Chapter of the Association of Certified Fraud Examiners

American Society of Association Executives

Michigan Society of Association Executives

McLaren Greater Lansing Healthcare Foundation, Board Chair Elect

ATHENA International

ATHENA Women’s Interest Network

Olivet College, Board of Trustees


Certified Public Accountant (CPA)

Certified Fraud Examiner (CFE)

Certified Association Executive (CAE)

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Relevant Services

Outsourced Accounting Solutions

Outsourced Accounting Solutions

Gain efficiencies and reduce stress by adding a team of experts instead of a dedicated staff.

CFO Advisory Services

CFO Advisory Services

Any size organization now has access to CFO insight, data, expertise and guidance.

Nonprofit Tax Planning

Nonprofit Tax Planning

We are well-versed in nonprofit tax compliance and legislation so we can develop a tax strategy that reduces your tax impact.

Strategic Planning

Strategic Planning

We can help your organization develop clear, practical and actionable steps to help achieve its long-term goals. Whether you’re enhancing your grant making strategy or are developing a framework to utilize federal funding as effectively as possible, our team is here to advise and support.

Grant Reporting

Grant Reporting

To support the entire process, we create a detailed report that provides the necessary financial data and strong narrative to your funder.

Association Solutions

Association Solutions

Help fortify the business side of your organization to engage the board, motivate volunteers and maximize your impact. Whether you need help with a special project or long-term financial strategy, our association team can help.



Properly incorporating technology is important to every organization. Our technical knowledge and industry expertise can help your nonprofit get the most out of your tech investments.

Reporting & KPIs

Reporting & KPIs

We put all your data in one place giving you better insight for better decisions and helping translate your number story into action. Whether you’re reporting back to the board, external stakeholders or your membership.

Succession Planning

Succession Planning

When you’ve poured your heart and soul into your life’s work, the right plan is crucial to help ensure it thrives. Our team can help your nonprofit develop a plan for board, leadership and staff transitions, ensuring no T is left uncrossed.

Wealth Management

Wealth Management

Our holistic approach ensures you’re investing your hard-earned money properly to achieve the secure retirement of your dreams.

Audit and Assurance

Audit and Assurance

Expertise with today’s complex nonprofit environment helps ensure you meet all federal and state compliance requirements.

Board Training

Board Training

Our team of experts have developed a time-tested training program to get new members up to speed successfully


Nonprofit Clients Served Across Michigan


Dedicated Nonprofit Industry Experts


Years of Experience Serving the Nonprofit Industry


Net Promoter Score

Industry Insights

Info Sheet

Your Niche Is Our Specialty.

When it comes to your unique financial needs, Maner Costerisan has the experts, tools, and services to stay focused on your next move.

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