On a $1,000,000 purchase in Orange County, new buyers typically pay $11,000 to $13,000 per year in base property taxes, before Mello-Roos. If the property is in a Mello-Roos district, add $1,000 to $5,000 or more annually. And in the first year after purchase, expect a supplemental tax bill of $5,000 to $8,000 that arrives separately and is not collected through your impound account.
By Austin Criss, REALTOR® | RE/MAX TIFFANY | June 17, 2026
Property taxes are one of the most consistently underestimated costs I see with first-time buyers. The 1% Prop 13 rate everyone hears about is real, but it’s not the whole picture. Here’s what I walk my buyers through before we even look at payment estimates.
The Base Rate: Prop 13 and Bond Assessments
California’s Proposition 13 (1978) caps the base property tax rate at 1% of your assessed value. When you buy a home, your assessed value is reset to your purchase price. After that, it can increase by no more than 2% per year regardless of what the market does, which is one of the long-term financial advantages of owning in California.
In practice, most Orange County properties carry voter-approved bond assessments on top of the 1% base. These fund schools, water districts, community colleges, and other local infrastructure. The effective rate, base plus bonds, typically runs 1.1% to 1.3% of the purchase price depending on the property’s location.
On a $1,000,000 purchase:
- At 1.1% effective rate: $11,000 per year / $917 per month
- At 1.25% effective rate: $12,500 per year / $1,042 per month
Your lender will collect taxes through your impound (escrow) account as part of your monthly payment. Make sure the estimate they use reflects your actual purchase price, not the prior owner’s lower assessed value shown in public records.
Mello-Roos: The Extra Line Many Buyers Don’t See Coming
Mello-Roos is a special assessment charged to homes in Community Facilities Districts (CFDs). These districts were created to finance the roads, utilities, parks, and schools that serve newer developments, and the cost is passed to homeowners in those areas as an annual fee.
Unlike your base property tax, Mello-Roos is a flat annual dollar amount, not a percentage of your home value. It does not benefit from Prop 13 protection. Typical Mello-Roos charges in Orange County run $1,000 to $5,000 or more per year depending on the district. Some newer communities in Irvine and other planned areas can exceed $5,000 annually.
Sellers are required to disclose Mello-Roos in California. To verify before making an offer, check the Natural Hazard Disclosure (NHD) report, review the current property tax bill, or use the CFD lookup tool at ocassessor.gov. I always pull this for my buyers before we get deep into a property, a $4,000 annual Mello-Roos charge adds $333 per month to the true cost of ownership.
Supplemental Tax Bills: The One-Time Charge Most Buyers Miss
After you close, the Orange County Assessor reassesses the property at your purchase price and issues a supplemental tax bill for the difference between the prior owner’s assessed value and your new one, prorated for the remaining portion of the tax year.
This bill is separate from your regular property tax bill. It is not collected through your impound account. It arrives in the mail 6 to 18 months after closing, often at a moment when you’ve moved on mentally from the purchase and the money isn’t sitting there waiting for it.
On a $1,000,000 purchase where the prior owner was assessed at $400,000, the supplemental bill covers the reassessment on $600,000, approximately $6,000 to $7,500 depending on timing. I tell every buyer I work with to set aside $5,000 to $8,000 for this bill and not touch it until after they receive it.
How to Look Up the Real Tax Cost on a Specific Property
- Go to ocassessor.gov and search by address or parcel number
- The record shows current assessed value, base tax rate, and any direct assessments
- Use the CFD lookup on the same site to check for Mello-Roos
- Remember: as a new buyer, your assessed value resets to your purchase price, the record shows the prior owner’s lower number, not yours
Frequently Asked Questions
What is the property tax rate in Orange County, CA?
Orange County’s base property tax rate is 1% of assessed value under Prop 13. Most properties also carry additional bond assessments that bring the effective rate to 1.1% to 1.3% of the purchase price. Properties in Mello-Roos CFDs pay an additional flat annual fee, typically $1,000 to $5,000 or more per year.
What is Mello-Roos and how do I know if a property has it?
Mello-Roos is a special assessment in Community Facilities Districts, typically newer developments. It is a flat annual fee (not a percentage) that does not benefit from Prop 13 protection. Sellers must disclose it. You can verify at ocassessor.gov or by reviewing the NHD report and current tax bill.
What is a supplemental property tax bill in California?
A supplemental tax bill is issued after purchase to cover the reassessment from the prior owner’s value to your purchase price, prorated for the year. It arrives 6 to 18 months after closing and is not collected through your impound account. Budget $5,000 to $8,000 for this.
How does Prop 13 protect California homeowners?
Prop 13 limits annual property tax increases to 2% on your assessed value as long as you own the home. Your assessed value resets to your purchase price when you buy, after that, it grows no more than 2% per year regardless of market appreciation.
How do I look up property taxes for a specific home in Orange County?
Go to ocassessor.gov and search by address or parcel number. The record shows base tax and any direct assessments. Use the CFD lookup for Mello-Roos. Note that your assessed value as a new buyer will be reset to your purchase price, not the prior owner’s number shown in public records.
If you’re running payment estimates on a specific home and want to make sure the tax number is accurate, I’m happy to pull the real figures with you. Call or text me at 714.600.1176. Always Ask Austin.
About Austin Criss
Austin Criss is a REALTOR® with RE/MAX TIFFANY serving Cypress, Buena Park, and Orange County, California. He specializes in helping first-time buyers and move-up sellers navigate the process from first question to closing. Call or text him at 714.600.1176, or visit austincriss.com.