KS&Co is the choice that offers Big 4 expertise with a personal touch.


Our Value Proposition

Established in 1991, KS&Co is a West Coast regional accounting firm with over 75 professionals, serving clients from offices in Seattle, Portland, Irvine, and San Diego. Our partners are alumni of the Big-4 accounting firms, which provides for a foundation of education and experience unmatched by smaller, local firms. We offer our clients Big-4 expertise at a fraction of the cost.

At KS&Co, we focus on several practices areas:

  • Our Large-Corp Practice provides tax advisory, corporate income tax compliance and income tax accounting services to over 100 public companies and many more venture-backed companies.
  • Our Mid-Market Practice provides tax advisory and compliance services to closely held businesses and their stakeholders.
  • Our Audit Practice performs financial audits for private companies, not-for-profit organizations, and employee benefit plans.
  • Our Global Mobility Practice¬†provides expatriate tax services for our corporate clients and their inbound and outbound employees.
  • Our Human Resources Practice provides the key components of an HR Department for those clients that don't have their own.

Our Locations

Contact Us
  • Seattle

    Smith Tower
    506 Second Avenue
    Suite 630
    Seattle, WA 98104

    Phone: 206.496.1515
    Fax: 206.496.1516
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  • Portland

    U.S. Bancorp Tower
    111 SW Fifth Avenue
    Suite 1850
    Portland, OR 97204

    Phone: 503.963.4720
    Fax: 503.963.4730
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  • Irvine

    6201 Oak Canyon
    Suite 200
    Irvine, CA 92618

    Phone: 949.250.3900
    Fax: 949.250.2956
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  • San Diego

    12750 High Bluff Drive
    Suite 160
    San Diego, CA 92130

    Phone: 858.465.1510
    Fax: 858.465.1511
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