401(k) Audit Firms in Washington

Last updated · Source data: plan year 2024 Form 5500 filings

Who audits the most 401(k) plans in Washington?

Baker Tilly US, LLP audited 329 Washington plans in plan year 2024, the most of any firm. Overall, 193 firms audited 1,561 plans sponsored in Washington; the median audited plan had 363 participants.

Most active in Washington

Baker Tilly US, LLP

329Washington plans audited

Top audit firms for Washington plans

Top 25 firms shown. Counts are retirement plan filings (401(k), 403(b), profit-sharing, and pension) whose sponsor address is in Washington.

Rankings derived from U.S. Department of Labor Form 5500 filings, plan year 2024. Read the full methodology.

Washington plan audit market at a glance

Washington employee benefit plan audits, plan year 2024
MeasureValue
Audited plans sponsored in Washington1,561
Audit firms with at least one WA engagement193
Median audited plan size (participants)363
Share of all U.S. audited plans2.0%

Choosing an audit firm in Washington

Engagement volume is the most objective public signal of employee benefit plan audit experience: the Department of Labor’s audit quality study found deficiency rates of 76% among CPAs performing one or two plan audits a year, versus 12% at the largest practices. The table above shows which firms do this work in Washington at real volume.

Beyond volume, ask candidate firms about AICPA Employee Benefit Plan Audit Quality Center membership, who staffs the fieldwork, experience with your recordkeeper and payroll systems, and whether the fee assumes an ERISA Section 103(a)(3)(C) election. A Washington address is not required — plan audits are performed remotely under the same national standards — but local presence can simplify scheduling and walkthroughs.