Monica J. Henderson, E.A.

Monica began her tax and accounting career in 1998 in Monterey, California, earning her Enrolled Agent designation (​federally licensed tax professional authorized to represent taxpayers before the IRS and prepare both federal and state tax returns​​)​ in 2002. Monica attended Monterey Peninsula College and Golden Gate University, where she developed a strong foundation in accounting and business that continues to guide her work today.

After moving to Phoenix, she founded North Phoenix Tax and Accounting in 2005. A visit to Payson’s scenic Rim Country inspired a permanent move in 2017, and by 2020, her firm became Copper State Tax & Accounting, reflecting her broader Arizona reach. 
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Known for helping individuals and small businesses achieve financial clarity and confidence, Monica provides personalized, accurate, and long-term guidance. She is passionate about building lasting relationships with her clients, ensuring they feel supported through every stage of their financial journey. Outside of work, she enjoys spending time with her horses, caring for her French Bulldogs, and quilting.

Amy Bookout, PTIN


​Amy Bookout has been a professional tax preparer since 2005, beginning her career at a small accounting firm in the Valley. In 2022, she relocated to the beautiful mountain community of Payson, where she continues to serve clients with dedication and care.

Amy values the relationships she builds through her work and looks forward to supporting both long-time and new clients for many years to come. Outside the office, she enjoys spending time outdoors and cherishing every moment with her husband, children, and grandchildren.

​Stephanie Tangeman, CPA

With over 40 years of experience in public accounting, Stephanie J Tangeman, CPA brings a wealth of information with her tax expertise and knowledge of accounting related issues. Steph has been a licensed Certified Public Accountant in Arizona since 1991.
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She serves individuals, businesses, estates & trusts and non-profit organizations. Throughout her career, she has held leadership roles at respected firms across Arizona and Iowa, including managing her own CPA practice. Her extensive background includes tax planning and preparation, financial statement analysis as well as accounting/bookkeeping services.
Steph is passionate about helping clients navigate the complexities of tax rules and regulations while supporting their financial goals. She believes in maintaining clear communication, staying up to date on changing tax laws and fostering long-term relationships with clients that are built on trust.

After previously working in Payson, she is excited to return to this area to live near her daughter’s family. Outside of work, she values a work/life balance that enables her to contribute her professional skills & abilities by helping clients financially succeed in life as well.

Meet our Team!

Amy Bookout, Tiffany Bankhead, Monica Henderson,   
​Sharon Henderson, Tiffany Barker, Steph Tangeman