For the next 3 weeks, or as long as the SIP remains in place, the Tax Collector’s office will be open to the public 9-5, M-F, by appointment ONLY. Appointments can be made online at The office will be closed 12/28, 12/31 and 1/1. We will be open 9-noon 12/24, 12/29 and 12/30, by appointment only.
ATTENTION: Click here for more information on COVID19 penalties and general FAQ.

Tax Collector Drop Box Location


San Mateo County Treasurer/Tax Collector, Sandie Arnott, an elected official, is charged with managing and protecting the County’s financial assets. She acts as the banker for the County and directs the investment of the County’s funds. The funds are invested in a portfolio of credit instruments called a pool. County Pool depositors include the County of San Mateo, elementary schools, high schools, community colleges and various other special districts and agencies within the County. It is the Treasurer’s mission to provide all pool participants with safety, liquidity and yield on their investments.

Recent Reports

Investment:                  December 2020

Compliance:                 December 2020

Absent Heirs:               January 2021

Closed RFP : RFP for Investment Advisory Services

Closed RFP: RFP for Investment Compliance Services

Closed: RFI - Broker/Dealer