Deer Park, CA Property Tax Rate (FY 2026-27)
Deer Park's property tax rate is 1.0501% for fiscal year 2026-27 in its primary tax rate area: the 1% Proposition 13 base plus 0.0501% 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 1.0501%. 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 | $5,250.50 | $437.54 |
| $750,000 | $7,875.75 | $656.31 |
| $1,000,000 | $10,501.00 | $875.08 |
| $1,500,000 | $15,751.50 | $1,312.63 |
| $2,000,000 | $21,002.00 | $1,750.17 |
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 Deer Park'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
Deer Park 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
| City or community | Tax rate (FY 2026-27) |
|---|---|
| American Canyon | 1.1073% |
| Angwin | 1.0189% |
| Calistoga | 1.0809% |
| Moskowite Corner | 1.1122% |
| Napa | 1.1272% |
| Oakville | 1.0501% |
| Rutherford | 1.0501% |
| St. Helena | 1.0592% |
| 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.