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Kerra Diener

CPA Partner

Get to Know Me

Kerra Diener is a tax partner with over 15 years of experience advising businesses and individuals on complex tax matters. She works closely with clients to optimize their tax positions while ensuring compliance with evolving federal and state tax laws.

Kerra has experience across entity types, including C corporations and consolidated groups, as well as S corporations and partnerships. She serves clients across a range of industries, with a particular emphasis on industrial and consumer products, franchising, and the food and beverage sector. She works closely with manufacturers, distributors, retailers, and wholesalers, providing tailored tax planning, compliance and advisory services designed to support growth and operational efficiency. In addition, she advises high-net-worth individuals and trusts on tax planning and compliance.

Her technical expertise includes multi-state tax planning and structuring, consolidated return matters, including intercompany transactions, federal and state tax credits and ASC 740 income tax provisions. Kerra has experience with accounting methods and revenue recognition issues, Section 263A capitalization and inventory-related considerations and, along with her team, advises clients on transaction-related planning such as mergers, acquisitions and restructuring.

Kerra has significant experience in insolvency tax and planning related to debt restructuring, reorganizations, and liquidations, including cancellation-of-debt income and attribute reduction. In addition, she represents clients in state tax examinations with an emphasis on California residency audits and assists with controversy matters involving federal and state taxing authorities.

Industry Expertise

Service Expertise

Learn More About My Story

Learn more about my professional experience and how I spend my time outside the firm.

Education:

  • BS, Accounting, California State University, Northridge

Professional Affiliations:

  • Member, American Institute of Certified Public Accountants (AICPA)
  • Member, California Society of Certified Public Accountants (CalCPA)
  • Member, ProVisors

Kerra is deeply committed to giving back to her community and supporting causes that matter to her. She is an active supporter of Blood Cancer United (formerly the Leukemia & Lymphoma Society) and participates in numerous events throughout the year. She helps raise awareness annually through the Light the Night campaign, where her team has successfully raised significant funds in support of blood cancer research and patient services.

Kerra is also involved in local education initiatives. She participates in the “Get Real: Adulting 101” program for high school juniors and seniors, an interactive simulation that gives students hands-on experience managing real-world financial decisions, including budgeting for housing, transportation and everyday living expenses. In addition, Kerra volunteers at her local elementary school’s annual career day, where she introduces students to the accounting profession and helps build early awareness of financial literacy and career opportunities. She is passionate about helping shape and inspire the next generation of thoughtful, capable leaders.

When she’s not at the office, Kerra enjoys time with her family and three children, staying active through hiking, mountain biking, camping, snowboarding, wakeboarding, and family games of softball and pickleball.

An avid gardener, she also spends much of her free time tending her aeroponic grow towers, cultivating a variety of vegetables, fruits, herbs, and flowers. She enjoys starting new plants, experimenting with combinations, and watching them thrive.

Kerra brings the same care and attentiveness to her work, creating environments where people and ideas can grow.

Authored Insights

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Kerra Diener Named as 2026 Los Angeles Business Journal Top 100 Accountant

Kerra Diener is a partner in Withum’s Los Angeles, CA office, advising multinational and multistate businesses on complex federal and state tax matters. Known for her specialized technical depth, she helps corporate and private clients across industries, including industrial and consumer products, real estate, theatre and entertainment and cannabis, with expertise spanning tax planning, compliance, M&A and consulting. The accolade…

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Kerra-Diener-Aza-Ghazaryan (1)
Los Angeles Business Journal Names Two Withum Leaders As Influential Women

Withum is proud to share that the Los Angeles Business Journal (LABJ) has named Aza Ghazaryan, Partner, and Kerra Diener, Partner, on their Leaders of Influence: Women in Accounting list for 2025. Aza Ghazaryan CPA, MBA, is a tax partner with over 15 years of experience in helping business minimize their tax liability. She provides…

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Los Angeles Business Journal Names Two Withum Leaders As Influential Women: (LABJ) has named Kerra Diener, Partner, and Lilit Nersisyan.
Los Angeles Business Journal Honors Two Withum Leaders As Influential Women

Withum is proud to share that the Los Angeles Business Journal (LABJ) has named Kerra Diener, Partner, and Lilit Nersisyan, Principal, on their Leaders of Influence: Women in Accounting list for 2024. Kerra Diener, CPA, is a Partner assisting multi-national and multi-state business entities with a wide range of federal and state tax topics. Her…