Tax Services
Seattle, WA
Located in North Seattle, Withum is a leading Seattle CPA firm with a robust ERISA practice, enhanced forensic capabilities and the ability to offer outsourced accounting and cybersecurity services locally and nationwide.
Ranked in the top 25 firms in the nation, Withum’s team of passionate professionals offer advisory, tax, audit and assurance services to the Seattle business community…plus a whole suite of advisory solutions that will level up your success. That’s the Power in the Plus!
(206) 522 6370
Seattle Service Specializations
Assurance and Accounting
Forensic and Valuation Services
Cybersecurity
Outsourced Accounting Systems and Services (OASyS)
Washington State and Local Tax Updates
Do you or your organization operate in multiple states? Do you own property in a variety of states? Washington State and Local Tax (SALT) laws are always changing and understanding the nuances of the states that you own or operate in is challenging. In these Washington resources, you’ll find just a dash of the most up-to-date details on rules and regulations as state and local tax changes happen by state!
Industries We Focus on in Washington
Beyond the Region
- Inside Public Accounting Top 100 Firms – 23rd Largest Nationally
- Accounting Today Top 100 Firms – 22nd Largest Nationally
- Great Place to Work® – Fortune Best Workplaces for Parents and Women
- Vault Top 25 Accounting Firm
Partner In Charge
Joseph M. Thiermann, CPAJoe is a partner with over 25 years of specialized audit experience with audits of defined contribution plans, defined benefit plans, health and welfare plans, labor organizations and not-for-profits. He conducts system-wide reviews, designs and implements accounting systems and works on special projects involving system design, expense reporting and compliance, often in conjunction with other professionals to resolve regulatory and general management issues for clients.
Joe is an avid public speaker, having presented at the Annual Conference of the International Foundation of Employee Benefit Plans (IFEBP), the IFEBP Accountants’ Institute and the Oregon Labor Law Conference, and even taught business courses to contractors.
Seattle Leadership
Withum in the News
Fatema Raza Honored With the NJ Chamber of Commerce Young Professional Award
The awards program recognizes exceptional women who create opportunities, drive positive change and strengthen communities across New Jersey through their leadership and service. Fatema, partner and Practice Leader of Withum’s Real Estate Services Team, provides audit, accounting, reporting and transaction advisory services to real estate developers, owners, operators, investors, REITs and private equity funds. Her…
INSIDE Public Accounting Names Withum to 2026 Best of the Best List
This accolade reflects the Firm’s long-term growth strategy centered on world-class client service, investment in innovation and strategic expansion. Ranking as a top-20 firm, Withum was recognized in the Best of the Best category for firms with more than $10 million in net revenue, earning a place among the profession’s top-performing accounting and advisory firms….
Buffalo Business First Names Christine Stolzenburg to 40 Under 40 Class of 2026
A decade after being recognized as a Buffalo Business First 30 Under 30 honoree, Christine’s selection highlights the continued growth of her influence as a leader, advisor and advocate for the Western New York community. Professional Experience and Industry Focus As a principal with more than 15 years of public accounting experience, Christine provides audit…
Construction Executive Names Withum Among Top 50 Construction Accounting Firms
This recognition reflects Withum’s deep specialization and longstanding commitment to the industry, with the Firm ranking among the top 20 construction accounting firms since 2019. For more than five decades, Withum has advised contractors, developers, suppliers, manufacturers, landscapers, dealers, renewable energy companies and other organizations across the construction ecosystem. The Firm’s Construction Services Team helps…
NJBIZ Names James Trubenbach-Byrne to 2026 People to Watch in Finance List
As a partner and leader within the Firm’s Healthcare and Not-For-Profit Services Teams, James serves healthcare organizations, not-for-profit entities, educational institutions and recipients of governmental funding. He specializes in providing audit services to complex healthcare and nonprofit organizations, helping leadership teams strengthen internal controls, improve operational efficiency and make informed business decisions. James works closely…
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