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2025 Summer Internship - Tax/Audit/Accounting and Outsourced Solutions

Reach your Potential at Maner Costerisan! Whether you’re brand new or years into your career, Maner Costerisan wants to help you achieve your goals. We offer business consulting and accounting careers that give you the chance to grow. To stretch. To learn. We invest in our people so they can invest in themselves, their work and their clients.

It’s not actually “about us.” It’s about you. Our coworkers, our clients, our community. For over a century, it’s always been about (and will always be about) helping you reach your potential.

We have grown into one of the top firms in the Great Lakes region. We are proud to have been voted one of the Best Accounting Firms to Work For by Accounting Today for the past 8 years in a row as well as Best Firms for Young Accountants in both 2021 and 2023. With over 170 team members and 2 locations, we are continuously investing in our people so they can invest in themselves, their clients and the community.


*Internship will run early June through Mid to the End of August Summer 2025

*Can be based at the Lansing or Grand Rapids office


Internship Opportunity

As an intern, you will be treated the same as an entry level staff member. You will be an integral part of the team. Interns will work in supervised client situations and be responsible for the applicable audit, tax or accounting services procedures. Interns are expected to communicate effectively both orally and in written form, work with others cooperatively and with respect and accept responsibility for their work and their actions. 

Tax Specific Duties

  • Prepare individual and business tax returns for detail review
  • Review and understand prior year tax returns and work papers
  • Understand and familiarize yourself with federal tax regulations

Audit Specific Duties

  • Work with audit team to complete audit engagements for a variety of clients
  • Perform Audit procedures including planning, testing and reporting
  • Review prior year work papers and financial statements

Accounting and Outsourced Specific Duties

·      Work with the Accounting and Outsourced team on a variety of client accounting projects

·      Understand basic accounting principles


·      Currently working towards Bachelor's or Master’s degree in Accounting.

·      GPA of 3.0 or higher preferred.

·      Excellent computer skills with knowledge and experience using Excel and Word.

·      Excellent verbal and written communication skills.