California’s property tax system is unique among U.S. states, thanks primarily to Proposition 13, passed in 1978. Understanding it affects your buying decisions and long-term financial planning.
The Basics: How CA Property Tax Works
The base property tax rate in California is 1% of the assessed value — set by Proposition 13. Local governments can add special assessments (Mello-Roos, school bonds, etc.) that push the effective rate to 1.1–1.6% depending on location.
Example:
- Home purchase price: $800,000
- Base property tax (1%): $8,000/year
- Additional local assessments (0.3%): $2,400/year
- Total property tax: $10,400/year ($867/month)
Prop 13: The Assessment Cap
This is the key: under Prop 13, your property’s assessed value can only increase by a maximum of 2% per year — regardless of what the market does.
Your home’s assessed value is “reset” to market value only when:
- The property changes ownership (you buy it)
- You make significant improvements or additions
This means long-time California homeowners pay dramatically lower property taxes than new buyers of the same home.
Example: Your neighbor bought the same model house in 1992 for $200,000. Their assessed value is ~$320,000 (30 years at 2%/year). They pay ~$3,200/year in property taxes. You bought in 2024 for $900,000 — you pay ~$9,000/year.
What Are Mello-Roos?
Many newer California communities were funded through Mello-Roos bonds — special assessment districts that pay for infrastructure (roads, parks, schools, utilities). These can add hundreds to thousands of dollars annually to your property tax bill.
Always ask: “Does this property have Mello-Roos?” before making an offer.
Senior Citizen Exemptions
California offers several programs for seniors 55+:
- Prop 60/90: Allows transfer of base year value when selling and buying a replacement home of equal or lesser value (now statewide via Prop 19)
- Homeowners’ Exemption: $7,000 off assessed value (saves ~$70/year)
- Senior Exemption: Income-qualified program for larger reductions
We build property tax estimates into every purchase scenario so clients know their full carrying cost before making an offer.