San Mateo County Tax Auctions
California tax-defaulted property auction data & enriched assessor records
San Mateo County isn’t live on Trelys yet. We’re staging its tax-defaulted listings and enriching each parcel with assessor and GIS data. Leave your email and we’ll tell you the moment it goes live.
How San Mateo County tax auctions work
When property taxes in San Mateo County go unpaid, the parcel becomes tax-defaulted. After the statutory waiting period, the county tax collector can sell it at public auction — and the minimum bid is tied to the back taxes owed, not the property’s market value. That gap is the opportunity, and the research is the work.
New to this? Start with how California tax-defaulted auctions work, then how to buy step by step and the real risks before you bid.
What you’ll get when San Mateo County is live
- Every upcoming San Mateo County tax-defaulted parcel in one searchable table
- Assessor and parcel data matched by APN — roll values, land use and mapped location
- Minimum bids and auction dates at a glance
- ROI calculator and saved deals to work your shortlist
San Mateo County tax auction FAQ
When will San Mateo County be available on Trelys?
We're staging San Mateo County's tax-defaulted listings and enriched assessor data now. Leave your email and we'll notify you the moment it goes live.
How do San Mateo County tax-defaulted property auctions work?
San Mateo County's tax collector auctions properties that have been tax-defaulted for at least five years (three for certain parcels). The minimum bid covers the unpaid taxes and costs, and the winning bidder receives a tax deed conveying the county's interest.
Where are San Mateo County tax auctions held?
San Mateo County tax-defaulted sales are held online through County-run online (My Tax Sale). Registration and a refundable deposit are typically required before you can bid.
How much do tax-defaulted properties in San Mateo County sell for?
It varies widely. Minimum bids start from the unpaid taxes and costs — often well below market value — but final prices depend on demand and the parcel's real value, which is why research matters.