BUYER GUIDE · 6 MIN READ
California Property Tax, Decoded
Prop 13's ~1% base, Mello-Roos add-ons in newer communities, and the first-year supplemental bill that surprises almost everyone.
1. Prop 13: the ~1% rule
California property tax is limited by Proposition 13: about 1% of assessed value plus local voter-approved add-ons, which puts effective rates for most homes around 1.1–1.3%. The key mechanic: assessed value resets to your purchase price when you buy, and can then rise at most 2% per year — which is why long-time owners often pay far less than new neighbors in identical houses.
2. Mello-Roos: the newer-community add-on
Some newer communities carry an extra Mello-Roos (Community Facilities District) special tax funding local infrastructure and schools. It appears on the property tax bill and can last decades. Before you offer on a newer development, check the tax bill or title report for it — the difference between two similar homes can be thousands per year.
3. The supplemental bill: year-one surprise
After you buy, the county issues a one-time supplemental tax bill covering the gap between the seller's old assessed value and your new purchase-price assessment. It arrives on top of the regular bill and is the most common first-year surprise for new owners — budget for it, and use the LA County Assessor's supplemental tax estimator to size it in advance.
FAQ
What effective tax rate should I budget?
Around 1.1–1.3% of your purchase price for most homes — more if the community carries Mello-Roos.
Will my tax jump every year?
Under Prop 13 your assessed value can rise at most 2% per year after the purchase-price reset.
How do I check a home for Mello-Roos?
Look at the property tax bill or the title report during escrow — it's listed as a special assessment.
PUT IT TO WORK
Questions about your situation? Our AI advisor answers from these same vetted sources — and scans every live listing while you talk.
SOURCES
- CA State Board of Equalization — property tax & Prop 13
- CA Treasurer (CDIAC) — Mello-Roos
- LA County Assessor — supplemental tax bill
General information only — not legal, tax, or lending advice. Rules change; verify with official sources and licensed professionals. Updated 2026-07-09.
GO DEEPER
Buying a Home in Los Angeles: the Full Process
Pre-approval, offers, escrow, inspections, title, and closing — how a California purchase actually runs, step by step.
FIRPTA: What Foreign Owners Face When Selling
Buying is not taxed under FIRPTA — selling is where the 15% withholding bites. Plan your exit on the way in.