Case Study: King County, WA achieves accurate, timely employment tax reporting with ADP SmartCompliance

Employment Tax Filing with ADP SmartCompliance

King County, the largest county in Washington with 14,300 employees, needed reliable employment tax reporting to protect its AAA bond rating and public services. When their long‑time tax accountant retired and a new HRIS was introduced, the county lost critical tax expertise and struggled to respond to IRS notices, so an outside consultant recommended outsourcing tax deposits and filings.

King County chose ADP SmartCompliance® to handle employment tax deposits and returns, leveraging ADP’s deep bench strength, milestone-driven processes, and tax expertise. The partnership restored confidence in accurate, timely reporting, reduced regulatory and financial risk, preserved staff roles, and gave the county peace of mind that payments and filings meet taxing‑agency requirements.

King County, WA

Mary Beth Short

Payroll, Benefits, Retirement and Safety and Claims Operations Division Director