Our Firm

Unnerstall & Unnerstall, CPA, P.C.

We combine the experience of a large firm with the personal attention that only a small firm can provide. Our clients come back to us year after year because they know they are in good hands. We work to develop long-term relationships; whether your needs are simple or complex, we can help.


Our People

Tim Unnerstall, CPA

Tim Anthony Unnerstall, C.P.A. (not Timothy) is a life-long resident of Washington, Missouri. He attended St. Francis Borgia Grade School and High School and received Associates Degrees from East Central College in Accounting and Computer Science. He received his Bachelors Degree in Business Administration from the University of Missouri - Saint Louis and was granted a certificate as a Certified Public Accountant by the Missouri State Board of Accountancy in June 1990.

While working to fulfill the experience and apprenticeship requirements for certification, Tim went to work for the firm of Maurice L. (Moe) Unnerstall, C.P.A. Moe’s father and Tim’s father’s father were brothers. Moe’s mother and Tim’s mother’s mother were sisters. This made Moe and Tim double-first-cousins-once-removed.

During the time Tim work for Moe, Moe decided to phase into retirement. At around that time, Tim’s nephew Steven (Steve) was completing his own certification requirements. As Moe’s career was winding down, Steve was able to join the firm and help carry the load.

Tim continues to be a member of St. Francis Borgia Parish. He is very active as the Executive Secretary of the Rotary Club of Washington, one of Washington’s premier service organizations. He serves as Treasurer of the Exceptional Equestrians of the Missouri Valley, Inc., an organization providing therapeutic horsemanship experiences to individuals with a variety of disabilities.

He serves on the board of the Washington Missouri Redevelopment Corporation and the Washington Civic Industrial Corporation. As a past chairman of the Washington Area Chamber of Commerce, he is a Chamber Ambassador. He also serves on the Community Advisory Board of the Bank of Washington.

Contact Tim at:


Steven G. Unnerstall, CPA, graduated with honors from Northeast Missouri State University (now Truman State) in 1989. He began his career at Hochschild Bloom before the opportunity arose in 1991 to partner with Tim.

Contact Steve at:



 Nancy Feldmann; Office Manager

Nancy has been with the firm since 1992.  Her responsibilities encompass office management, customer service and accounts receivables. 

Contact Nancy at:



Kathy Heeger; Senior Tax Consultant

Kathy has been with the firm since 1976.  She specializes in personal, trust and business taxes.

Contact Kathy at:



Jennifer Gildehaus; Corporate Tax Consultant

Jennifer specializes in corporate tax returns as well as onsite bookkeeping.

Contact Jennifer at:



Jamie Getsee;  Corporate Tax Consultant

Jamie specializes in corporate tax returns as well as onsite bookkeeping for accounting software (Quickbooks, Peachtree, etc.).

Contact Jamie at:



Nadine Feltmann; Payroll, Personal, Trust and Business Tax Consultant

Nadine specializes in payroll reports and production, as well as personal and business tax returns as well as onsite bookkeeping.

Contact Nadine at:



Paul Unnerstall; Personal, Trust and Business Tax Consultant

Paul specializes in personal, trust and business tax preperation.

Contact Paul at:



Donna Katzung; Payroll

Donna specializes in payroll reports and total payroll execution.

Contact Donna at:



Back to the top

Our History

Unnerstall and Unnerstall, CPA, P.C., began in 1958 with general accounting services for business and individuals. This developed into strategic planning for individual wealth maintenance, minimization of tax liabilities for individuals and corporations, payroll and consulting services. We believe in "old school" principles, but we also believe in keeping up with the needs of individuals and businesses in this rapidly changing world.  In 1991 Tim took the business over from a retiring Moe Unnerstall and brought on Steve as a partner in order to help with the rapidly expanding workload.

Back to the top

Our Credentials

The firm of Unnerstall and Unnerstall, Certified Public Accountants, P.C., and the firm's principals, Tim A. Unnerstall, C.P.A. and Steven G. Unnerstall, C.P.A., are members of the American Institute of Certified Public Accountants (MSCPA).  Our firm participates in the AICPA's Peer Review program administered by the MSCPA.  On April 23, 2015, the Missouri East Acceptance Committee of the MSCPA accepted the report on the most recent peer review of our firm.  We received a "pass" rating on our review, which is the highest rating possible.  The review report and acceptance letter can be viewed here.

Back to the top

Our Areas of Specialization

Our entire operation is rooted in a tradition of meeting the highest standards of accounting practices. From this foundation, we offer the following specialized services: strategic tax planning for individuals and businesses, financial planning services for individuals and estates, consulting services for business development and management and  full service or supplemental payroll production.

Back to the top

  • At Unnerstall and Unnerstall, CPA, P.C., we provide tax services for... Read more
  • We provide compilation, review and audit accounting... Read more
  • As much as you would like, not everything fits neatly into your... Read more