St. Helena, CA Property Tax Rate (FY 2026-27)

St. Helena's property tax rate is 1.0592% for fiscal year 2026-27 in its primary tax rate area: the 1% Proposition 13 base plus 0.0592% 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 1.0592%. 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.

Estimated first-year property tax in St. Helena, CA at 1.0592% (FY 2026-27)
Purchase price	Annual tax	Monthly
$500,000	$5,296.00	$441.33
$750,000	$7,944.00	$662.00
$1,000,000	$10,592.00	$882.67
$1,500,000	$15,888.00	$1,324.00
$2,000,000	$21,184.00	$1,765.33

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.

City

Home price$ City tax rate FY 2026-27% Fixed assessments estimate$/yr Primary residence ($7,000 homeowners' exemption)

Fixed assessments are the Mello-Roos, parcel taxes and special assessments on the property's tax bill. We start with an estimate of $1,500 a year. They vary by parcel, so check the actual bill.

Look up your Napa County tax bill

Annual property tax$12,017.86$1,001.49 a month

True tax rate1.202%the rate you really pay

Your true tax rate counts the whole bill, not just the city rate. On a newly purchased home: ($10,517.86 at the city rate + $1,500.00 in fixed assessments) ÷ $1,000,000 purchase price.

How that adds up
Home exemption	-$7,000
Taxable value	$993,000
Tax at the city rate	$10,517.86
Fixed assessments	$1,500.00
Annual property tax	$12,017.86

What this rate leaves out

This is the rate for St. Helena'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 Napa County property tax bill on the Napa County Treasurer-Tax Collector site. Napa County property tax rates and due dates.

Loan limits

St. Helena is in Napa County, where the 2026 conforming loan limit for a one-unit home is $1,017,750. Napa County loan limits.

Other cities in Napa County

Property tax rates, Napa County (FY 2026-27)
City or community	Tax rate (FY 2026-27)
American Canyon	1.1073%
Angwin	1.0189%
Calistoga	1.0809%
Deer Park	1.0501%
Moskowite Corner	1.1122%
Napa	1.1272%
Oakville	1.0501%
Rutherford	1.0501%
Yountville	1.0934%

Source

Rate from County of Napa - Tax Rates and Information For Fiscal Year 2026-27 (Auditor-Controller Tracy A. Schulze, dated 9/30/26). All California city rates.

See St. Helena's taxes in your payment in Mortgage Blueprint