📌 Key Takeaways
- Your base assessed value is capped at 2% annual increases under Prop 13. However, your total tax bill can increase more
- When you buy a California home, the county reassesses it at your purchase price. A supplemental tax bill covers the tax
- The IRS generally treats buyer rebates as a reduction in the purchase price of the home rather than income, so the rebat
California property taxes confuse buyers coming from other states — and even confuse long-time residents. Here is a complete, plain-English explanation of how California property taxes actually work.
The foundation: Proposition 13 (1978)
Proposition 13, passed in 1978, is the law that defines California property taxation. Its core provisions:
- Property is assessed (valued for tax purposes) at its purchase price when you buy it
- The base tax rate is capped at 1% of the assessed value
- Annual increases in assessed value are capped at 2% per year regardless of actual market appreciation
- The assessed value only resets to current market value when the property is sold or transferred
This means: if your neighbor bought their home 20 years ago for $400,000, they pay taxes on $400,000 (adjusted 2% annually = roughly $600,000 today). You buy the same home for $1.5M — you pay taxes on $1.5M. This creates huge disparities between neighbors.
Your actual tax bill: more than 1%
The 1% base rate is just the start. Your actual property tax bill will include additional voter-approved assessments:
- General obligation bonds (school districts, community colleges, city bonds)
- Special district assessments (fire, water, lighting, mosquito abatement)
- Mello-Roos CFD assessments (in newer communities)
The result is an effective tax rate typically between 1.1% and 1.5% for established communities, and up to 2%+ in newer communities with significant Mello-Roos.
How to estimate your exact property tax
Step 1: Find the parcel number for any home you are considering (it is on every listing).
Step 2: Search the county assessor website for that parcel.
Step 3: Look at the current tax bill — this shows the full effective rate.
Step 4: Apply that effective rate to your purchase price (not the current assessment).
Example: You are buying a home in Irvine for $1,250,000. The current owner's tax bill shows $14,800/year on a $950,000 assessment — effective rate of 1.56%. Apply 1.56% to $1,250,000 = $19,500/year in property taxes ($1,625/month).
Supplemental tax bills
When you buy a home in California, you will receive a supplemental tax bill within 6–12 months of closing. This covers the difference between the previous owner's assessed value and your new purchase price, prorated for the remainder of the fiscal year. This is in addition to your regular tax bill and surprises many first-time buyers.
Budget for the supplemental bill. On a $1M purchase in a home previously assessed at $500,000, the supplemental bill could be $5,000–$7,000.
Homeowner's Exemption
California offers a $7,000 reduction in assessed value for primary residences (not investment properties or vacation homes). File with your county assessor after purchase. This saves approximately $70–$100/year — small but worth filing.
Property tax and your mortgage payment
Most lenders require property taxes to be impounded — collected monthly as part of your payment and held in escrow to pay the tax bill when due. Use our mortgage calculator to see the property tax component of your estimated monthly payment.
Get 1% cash back when you buy in SoCal
Free consultation · Full-service agent · DRE #02232009
Get my free rebate estimate →Frequently Asked Questions
Your base assessed value is capped at 2% annual increases under Prop 13. However, your total tax bill can increase more than 2% if voters approve new bonds (school bonds, infrastructure bonds) that add new line items to your bill. These bond assessments are not capped by Prop 13 — they run for their specific term and then expire.
When you buy a California home, the county reassesses it at your purchase price. A supplemental tax bill covers the tax difference between the old assessment and your new purchase price, prorated from your close of escrow date to the end of the fiscal year (June 30). You will typically receive this bill 6–12 months after closing. It is separate from your regular annual tax bill and can be several thousand dollars on a high-value purchase.
The IRS generally treats buyer rebates as a reduction in the purchase price of the home rather than income, so the rebate itself is typically not taxable. However, it slightly reduces your cost basis, which could have minor capital gains implications when you eventually sell. Consult your CPA. The rebate amount you receive at closing is entirely yours to use as you choose.
Mike Basti founded Portfolio Home Realty to give Southern California buyers full-service representation and real cash back at closing. Licensed California broker serving LA County and Orange County. Call (949) 379-5320.
The bottom line
How California property taxes work, what Prop 13 means for you, how to estimate your actual tax bill, and what to watch out for when buying. Portfolio Home Realty gives Southern California buyers full-service representation and returns 1% of the purchase price at closing. Call (949) 379-5320 or get a free estimate online.