Withum Plus Portland
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!
Find The Portland Office
4380 S Macadam Avenue,
Suite 365,
Portland, OR 97239
Phone: (971) 352-6300
Partner in Charge: Joe Thiermann
Portland Accounting and Advisory Service Specializations
Tax
Learn moreAssurance and Accounting Services
Learn moreState and Local Tax
Learn moreOutsourced Accounting Systems and Services
Learn MoreOregon 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
Withum in the Portland Community
Withum’s team members thrive in the office and in the Greater Portland community. Giving back to the communities in which we live and work is a central pillar of the Withum Way. That includes supporting local organizations through community service, events and more. The team focuses on supporting organizations that strengthen the community locally and throughout the state.
Beyond the Portland Office
- 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

Joe 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.