What Are the Property Tax Rates in Danville CA and What Should I Budget for on a $2 Million Home?

California property taxes are governed by Proposition 13, passed in 1978. That law set the base property tax rate at 1% of a property's assessed value and limited how fast that assessed value can grow each year. Understanding Prop 13 is the single most important thing a buyer moving to Danville can do before estimating their ongoing housing costs.

The 1% Base Rate and How It Is Set

Every property in California, including every home in Danville, starts with a 1% base tax rate applied to its assessed value. That 1% goes to the state and is then distributed to local government, schools, and other public services. On top of that 1%, Contra Costa County and local districts layer additional voter-approved assessments, which is why your actual effective rate ends up slightly above 1%.

Prop 13 also caps annual increases in assessed value at 2% per year, regardless of what the market does. This is why a neighbor who bought their Danville home in 2005 pays dramatically less in property taxes than someone who buys the same model today. The tax is anchored to the purchase price, not the current market value, for as long as the owner holds the property.

How Your Assessed Value Is Determined at Purchase

When you buy a home, the purchase price becomes your new assessed value. This is called a "change of ownership reassessment." The Contra Costa County Assessor's office resets the assessed value to your actual purchase price, and your property tax bill for the first full fiscal year reflects that new number. There is no negotiating the starting assessed value down; it is the price you paid.

Contra Costa County's fiscal year for property taxes runs from July 1 through June 30. If you close on a Danville home in the middle of the year, you will typically receive a supplemental tax bill covering the period from your close of escrow through the end of that fiscal year. Buyers are sometimes surprised by this bill, so it is worth budgeting for it in advance.

2. What Are the Property Tax Rates in Danville CA?

The effective property tax rate in Danville, CA currently falls between approximately 1.1% and 1.25% of assessed value, depending on the specific parcel. The variation comes from local bond measures and special district assessments that differ by neighborhood and even by subdivision. You can look up parcel-level detail through the Contra Costa County Assessor's portal or review rate breakdowns through resources like Ownwell's Danville property tax data.

The Base Rate Plus Local Add-Ons

Danville sits within Contra Costa County, unincorporated, which means it does not have its own city government or city-level tax rate. Instead, the county collects taxes and distributes them to the relevant agencies. The add-ons above the 1% base rate in Danville typically include countywide debt service levies, San Ramon Valley Unified School District bond measures, the East Bay Regional Park District assessment, and a handful of other voter-approved obligations.

These additional levies generally add between 0.10% and 0.25% to your effective rate. On a $2 million home, the difference between a 1.10% and a 1.25% effective rate is $3,000 per year, so it is worth pulling the actual tax rate area code for any specific property you are considering. Your escrow officer or the county's tax collector website can confirm the exact rate for a given parcel before you close.

Common Mello-Roos and Bond Assessments in Danville

Mello-Roos districts are less common in Danville than in newer planned communities further east, but they do exist in some subdivisions. A Mello-Roos Community Facilities District (CFD) is a special tax that was typically levied to finance infrastructure when a neighborhood was built. Unlike the Prop 13 assessed value, Mello-Roos charges are fixed dollar amounts per parcel, not percentages, and they do not reset at sale. They run for a set term, often 25 to 40 years from the date the district was formed.

Established Danville neighborhoods, including many of the larger lots along Diablo Road or the older custom-home areas near Mount Diablo's foothills, were built before Mello-Roos was common and often carry no CFD charge at all. Newer planned communities, particularly those built in the 1990s and 2000s near Camino Tassajara, may carry annual Mello-Roos assessments ranging from a few hundred dollars to over $2,000 per year. Always ask for a Natural Hazard Disclosure report and a tax certificate during escrow so you can see every line item before you commit.

3. What Should I Budget for Property Taxes on a $2 Million Home in Danville?

On a $2 million home in Danville, your annual property tax bill will most likely fall between $22,000 and $25,000, with the exact number depending on which specific assessments apply to that parcel. That translates to roughly $1,833 to $2,083 per month, which is a meaningful line item in any housing budget and worth modeling carefully before you make an offer.

Running the Numbers on a $2 Million Purchase

Here is how the math works at different effective rates on a $2,000,000 assessed value:

• At 1.10% effective rate: $22,000 per year, or approximately $1,833 per month.
• At 1.15% effective rate: $23,000 per year, or approximately $1,917 per month.
• At 1.20% effective rate: $24,000 per year, or approximately $2,000 per month.
• At 1.25% effective rate: $25,000 per year, or approximately $2,083 per month.

Contra Costa County collects property taxes in two installments each year. The first installment covers July 1 through December 31 and is due November 1, becoming delinquent after December 10. The second installment covers January 1 through June 30 and is due February 1, becoming delinquent after April 10. If you are financing your purchase, your lender will almost certainly require an impound account, meaning your monthly mortgage payment will include a property tax reserve so the lender can pay the installments on your behalf.

For a detailed breakdown of how Contra Costa County structures its tax deadlines and what happens if a payment is late, JVM Lending's Contra Costa County property tax guide is a thorough reference that walks through the full payment calendar and penalty structure.

How Taxes Change Over Time Under Prop 13

Once you own the home, your assessed value can increase by no more than 2% per year under Prop 13, regardless of what Danville's market does. If you hold a $2 million home for 10 years, the assessed value could rise to roughly $2.44 million by year 10 (at 2% compounding annually), putting your annual tax bill at approximately $26,800 to $30,500 depending on the effective rate. That is a meaningful but predictable increase, and it is far slower than the appreciation Danville has historically seen in market values.

One important exception: if you make substantial improvements to the property, the cost of those improvements is added to your assessed value in the year they are completed. Adding a pool, an accessory dwelling unit, or a major addition to a Danville home will trigger a supplemental assessment for the added value. Routine repairs and maintenance do not trigger reassessment.

4. Other Annual Costs That Arrive With Your Property Tax Bill

Your property tax bill in Danville is not just taxes. The county bundles several other annual charges onto the same bill, and buyers who have not bought in California before are sometimes surprised to see them. Understanding what each line item is will help you budget accurately from day one.

Special District Fees and Assessments

Beyond the base 1% and bond measures, Danville properties may carry fixed-dollar annual charges from several special districts. These typically include the East Bay Regional Park District assessment (generally under $30 per year), a stormwater management fee, and in some cases a lighting and landscape district charge. Individually these are small, but together they can add $200 to $600 per year to your bill depending on which apply to your parcel.

Danville is served by the East Bay Municipal Utility District (EBMUD) for water and the Central Contra Costa Sanitary District for sewer. These utility agencies bill separately from the property tax bill, so they are not included in the figures above, but they are worth factoring into your total monthly housing cost. Water and sewer for a larger Danville home typically run $150 to $300 per month combined, depending on lot size, irrigation, and usage.

HOA Fees in Danville Neighborhoods

Many of Danville's planned communities and gated neighborhoods carry homeowner association dues that are separate from your property tax bill. Neighborhoods like Blackhawk, which is a gated community in the hills east of downtown Danville, carry HOA fees that can range from roughly $200 to over $600 per month depending on the specific sub-association. Those fees cover gate staffing, common area maintenance, and in some cases community amenities.

Homes on larger lots along Camino Tassajara, in the Sycamore Valley area, or on custom parcels near the Iron Horse Regional Trail corridor may have no HOA at all. At the $2 million price point in Danville, you will find both HOA and non-HOA properties, so it is worth clarifying this early in your search. If you are working with a buyer's agent, this is a straightforward filter to apply. For more on how to find the right buyer representation in Danville, see this guide to finding a buyer's agent in Danville.

5. How to Appeal Your Assessment and Other Ways to Reduce Your Bill

In most cases, buyers of a $2 million home in Danville cannot lower their initial assessed value because it is set to the purchase price. However, there are specific situations where an appeal or exemption can reduce what you owe, and it is worth knowing what they are.

When an Appeal Makes Sense

If the market value of your Danville home drops below your assessed value, you can file for a temporary reduction called a Proposition 8 decline-in-value review. This happened broadly during the 2008 to 2012 downturn and can happen again in a correction. You file with the Contra Costa County Assessor's office, and if the assessor agrees that the market value is below your assessed value as of January 1 of the tax year, they will temporarily reduce your assessment. Once the market recovers and market value exceeds assessed value again, the assessed value is restored.

You can also appeal if you believe the county made an error in processing your reassessment after purchase. This is rare but does happen, particularly when a sale involves complex terms like seller concessions or personal property included in the purchase price. The appeal deadline in Contra Costa County is generally September 15 for the prior fiscal year's assessment. Missing that deadline means waiting another full year.

Exemptions That Can Lower Your Taxable Value

California offers a Homeowners' Exemption of $7,000 off your assessed value if the property is your primary residence. On a $2 million home, this saves you roughly $70 per year at a 1% base rate. It is a small number, but it is free money, and you simply need to file a one-time form with the Contra Costa County Assessor's office after closing. The exemption stays in place as long as you own and occupy the home.

California's Proposition 19, which took effect in 2021, significantly changed the rules for transferring assessed value when you sell one home and buy another. If you are 55 or older, severely disabled, or a victim of a declared disaster, you may be able to carry your existing assessed value to a replacement home in California, including in Danville. This can be a substantial benefit for longtime Bay Area homeowners who have accumulated a large difference between their assessed value and the current market price. Consult a tax advisor to determine whether you qualify and how to structure the transaction.

If you are also thinking about what the current Danville market looks like at the $2 million price point, including what types of homes are available and how inventory is moving right now in September 2026, the Danville homes for sale buyer's guide covers current conditions in detail.