Castro Valley, CA Property Tax Rate (FY 2026-27)
Castro Valley's property tax rate is 1.1800% for fiscal year 2026-27 in its primary tax rate area: the 1% Proposition 13 base plus 0.1800% in voter-approved bonds.
First-year property tax by purchase price
Under Proposition 13 the purchase price becomes the assessed value, so the first-year tax at the city rate is the price times 1.1800%. Fixed assessments come on top. Your true tax rate is the two together, the tax at the city rate plus fixed assessments, divided by the purchase price on a newly purchased home.
| Purchase price | Annual tax | Monthly |
|---|---|---|
| $500,000 | $5,900.00 | $491.67 |
| $750,000 | $8,850.00 | $737.50 |
| $1,000,000 | $11,800.00 | $983.33 |
| $1,500,000 | $17,700.00 | $1,475.00 |
| $2,000,000 | $23,600.00 | $1,966.67 |
Property tax calculator
Search for a city, then change the price, rate or fixed assessments to estimate a first-year bill. It uses the same math as Mortgage Blueprint's tax breakdown.
What this rate leaves out
- This is the rate for Castro Valley's primary tax rate area. Other tax rate areas in the same city can have a different rate.
- Mello-Roos (Community Facilities District) taxes, flat parcel taxes and fixed special assessments are not included. Check the property's tax bill.
- Buyers get a supplemental tax bill after purchase for the change in assessed value.
- Under Proposition 13, the assessed value can rise by at most 2% a year while you own the home.
Look up a tax bill
Look up your Alameda County property tax bill on the Alameda County Treasurer-Tax Collector site. Alameda County property tax rates and due dates.
Loan limits
Castro Valley is in Alameda County, where the 2026 conforming loan limit for a one-unit home is $1,249,125. Alameda County loan limits.
Other cities in Alameda County
| City or community | Tax rate (FY 2026-27) |
|---|---|
| Alameda | 1.2150% |
| Albany | 1.3465% |
| Ashland | 1.2654% |
| Berkeley | 1.2313% |
| Cherryland | 1.2126% |
| Dublin | 1.2331% |
| Emeryville | 1.1627% |
| Fairview | 1.2126% |
| Fremont | 1.1746% |
| Hayward | 1.1966% |
| Livermore | 1.1384% |
| Newark | 1.1458% |
| Oakland | 1.2849% |
| Piedmont | 1.1819% |
| Pleasanton | 1.1691% |
| San Leandro | 1.2308% |
| San Lorenzo | 1.2654% |
| Sunol | 1.1346% |
| Union City | 1.2641% |
Source
Rate from Alameda County Auditor-Controller, Tax Rate Search, Tax Year 2026-27. All California city rates.
See Castro Valley's taxes in your payment in Mortgage Blueprint