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Tax Sale Atlas
County-verified

San Mateo County, CA tax sales

How tax lien certificate and tax deed sales work in San Mateo County, seat of Redwood City: sale calendar, auction platform, over-the-counter lists, and the offices that run each sale.

Verified Jul 27, 2026 against official county and state sources.

How San Mateo County sells delinquent taxes

Tax certificate sale (lien)

Details are being verified for this county.

Tax deed sale

MyTaxSale
Run by
San Mateo County Tax Collector (Office of the Treasurer/Tax Collector, Sandie Arnott)
Frequency
annual
Typical timing
The county's Tax Sale FAQs state: "Tax sales are typically held online in August, with information posted in advance." As of July 2026 the auction site shows "The next Tax Sale has not yet been scheduled. We will send email notifications to all registered users as soon as it is posted."
Sale list
Tax sale auction listings (property list posted here once a sale is scheduled)

Registration and deposit

Register free at sanmateo.mytaxsale.com; registration stays open year round and registered users get email notice when a sale is posted. A deposit is required and is applied to the purchase if you win; unsuccessful bidders are refunded within about 10 business days. Vesting (how title will be held) must be supplied during registration and cannot be changed later. Winning bidders owe full payment within five business days to Grant Street, plus recording fees and documentary transfer tax of $0.55 per $500.

San Mateo County runs a deed sale, not a lien sale: the FAQs state "San Mateo County does not sell tax lien certificates," and "Legal title to tax-defaulted property can only be obtained by being the highest bidder at the tax sale." The sale is conducted online through the county's Grant Street Group MyTaxSale site rather than in person. The owner's right of redemption ends at the close of business on the last business day before the tax sale. By law the minimum bid must cover the total redemption amount plus sale costs, and unsold parcels may be reoffered at a lower price in a future auction. Not every listed parcel is auctioned; some are redeemed, postponed, or removed. There is no over-the-counter path: the FAQs state all sales must occur through the public auction process, and unsold parcels stay in tax sale inventory with the owner's redemption right reinstated.

Register on MyTaxSale

County offices

Tax Collector (runs the certificate sale)

San Mateo County Tax Collector (Treasurer/Tax Collector)

(866) 220-0308

555 County Center, Floor 1, Redwood City, CA 94063 (mailing: San Mateo County Tax Collector, PO Box 45878, San Francisco, CA 94145-0878)

Official website

Notes for San Mateo County

  • The auction platform is Grant Street Group's MyTaxSale, branded for the county at sanmateo.mytaxsale.com. Platform support is listed at 877-274-9320, weekdays 5am to 5pm Pacific.
  • Most liens are cleared by the tax deed, but the county FAQs warn that IRS liens, lis pendens, and certain liens under R&T Code section 3712 can survive the sale, so buyers must run their own title work.
  • Parcel research: the FAQs point bidders to the San Mateo County Assessor at 555 County Center, 1st Floor, Redwood City, CA 94063, (650) 363-4500, for parcel maps and GIS lookups. Listed street addresses are not guaranteed accurate.
  • The county recommends waiting one year after the deed is recorded before improving or reselling, since prior owners and lienholders have that window to challenge the sale.
  • Excess proceeds over $150 may be claimed by parties of interest under R&T Code section 4675. Claims are due within one year of the deed recording date and a $300 processing fee is deducted.
  • Defaulting on a winning bid forfeits the deposit and bars the bidder from county tax sales for five years.
  • Office phone hours match office hours, Monday to Friday, 9 AM to 5 PM. Treasurer division direct line is (650) 363-4580, option 2. General email is [email protected].

California statewide rules

Redemption
Tax-defaulted property may be redeemed until the right of redemption is terminated (section 4101). That right terminates at the close of business on the last business day prior to the commencement date of the tax sale, and the start of the auction counts as the sale date no matter when bidding closes. A redemption payment sent by mail must be received in the tax collector's office before that deadline. California has no post-sale redemption period: once the auction opens, a record owner who has not redeemed loses all legal and equitable interest in the property. Two situations revive the right of redemption. The right revives if the property is not sold, and it revives on the next business day if the tax collector approved a credit sale and the buyer did not pay in full by the deadline the tax collector set.
Deed deposit
The tax collector may require a deposit and must give public notice before the sale of its amount, payment method, and due date, and of whether it is a condition of bidding or applies toward the purchase price. On a sale the tax collector approves as a deferred-payment transaction, the deposit may be $5,000 or 10 percent of the minimum bid price, whichever is greater. Counties set the specific figure, so confirm it on the county page or auction platform.
Surplus proceeds
Sale proceeds first cover statutory distributions, then taxes, assessments, and county costs. Anything left is excess proceeds held in the delinquent tax sale trust fund. A party of interest may file a claim at any time before one year after the tax collector's deed to the purchaser is recorded. Distribution runs first to lienholders of record before the tax deed was recorded, in order of their priority, then to persons with title of record. Excess proceeds not claimed within that year may be transferred to the county general fund.
Governing statute
Cal. Rev. & Tax. Code, Division 1, Part 6 (sections 3351 to 3972)

A tax deed does not convey marketable title. Most buyers file a quiet title action before they can resell or insure the property. See the due diligence guide.

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Frequently asked questions

Does San Mateo County, California sell tax liens or tax deeds?

San Mateo County follows California's tax deed state system.

How often does San Mateo County hold tax deed sales?

annual. Each sale is scheduled and advertised in advance, so check the county's tax deed calendar for the next posted date.

Tax Sale Atlas publishes educational information about public tax sale processes. This is not legal, financial, or investment advice. Rules, dates, and fees change; confirm with the county office before you bid.

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