Tax Services
Portland, OR
Located in South Portland, Withum is a leading Portland CPA firm focused on accounting, tax and advisory services.
As a top 25 national firm, Withum’s dedicated team members serve organizations across industries that range from startups to global enterprises. We are a technology-driven firm helping the Portland community grow and thrive with services ranging from cybersecurity and forensics accounting to employee benefit plan audits and outsourced accounting services…plus a whole suite of advisory solutions that will level up your success. That’s the Power in the Plus!
(818) 789 1179
Portland Service Specializations
Assurance and Accounting
Cybersecurity
Forensic and Valuation Services
State and Local Tax
Outsourced Accounting Systems and Services (OASyS)
Oregon State and Local Tax Updates
Do you or your organization operate in multiple states? Do you own property in a variety of states? Oregon 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 Oregon 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 Portland
Beyond the Region
- Inside Public Accounting Top 100 Firms – 20th Largest Nationally
- Accounting Today Top 100 Firms
- 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.
Portland Leadership
Withum in the News
Withum Recognized in New Jersey Law Journal’s 2026 “Best Of” Survey
Withum’s ranking on the “Best Of” Business Accounting Provider for law firms reflects the value Withum brings to the legal industry when helping address the unique needs of law firms. The Law Firm Services Team serves firms of all sizes, from boutique practices to Am Law 200 organizations, helping managing partners and firm leadership make…
Withum’s Red Bank Office Relocates to Holmdel, NJ
Located at Bell Works, the new Holmdel office places Withum within one of New Jersey’s most distinctive business and community destinations. The move provides a dynamic environment for team members to collaborate, connect with clients and continue building relationships throughout the region. The Firm’s Holmdel Team serves clients across many of New Jersey’s leading industries,…
NJBIZ Names Matt Walsh to Forty Under 40 Class of 2026
Industry Leadership Matt, partner and Practice Leader of Withum’s Industrial and Consumer Products Services (ICP) Team, helps drive the strategic direction, national growth and continued development of the multidisciplinary practice. He works with clients across the ICP industry, including multinational organizations, private equity-backed companies and closely held businesses. Matt played a key role in aligning…
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….
Contact Us
We will make every attempt to respond to your inquiry in a timely manner.