Williams, CA Property Tax Rate (FY 2025-26)
Williams' property tax rate is 1.1183% for fiscal year 2025-26 in its primary tax rate area: the 1% Proposition 13 base plus 0.1183% 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 1.1183%. 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 | $5,591.48 | $465.96 |
| $750,000 | $8,387.21 | $698.93 |
| $1,000,000 | $11,182.95 | $931.91 |
| $1,500,000 | $16,774.43 | $1,397.87 |
| $2,000,000 | $22,365.90 | $1,863.83 |
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 Williams' 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 Colusa County property tax bill on the Colusa County Treasurer-Tax Collector site. Colusa County property tax rates and due dates.
Loan limits
Williams is in Colusa County, where the 2026 conforming loan limit for a one-unit home is $832,750. Colusa County loan limits.
Other cities in Colusa County
| City or community | Tax rate (FY 2025-26) |
|---|---|
| Colusa | 1.1008% |
Source
Rate from Market Valuations, Tax Allocations, and Tax Rates 2025-2026 (Secured Tax Rate Table by Tax Rate Area). All California city rates.