Simi Valley is in Ventura County, and its property tax starts from California’s 1% Proposition 13 base rate. With voter-approved bonds and direct assessments, the effective rate commonly runs about 1.05%–1.10% — roughly $8,778 a year on the $836,000 June 2026 median sale price.
How the bill is actually built
California property tax starts with Proposition 13: a 1% base rate on assessed value, where assessed value resets to the purchase price when a property changes hands and then rises no more than 2% per year. Everything above that 1% is local — voter-approved bonds and fixed direct assessments that vary by tax rate area rather than by city.
| Component | Typical rate or amount | Notes |
|---|---|---|
| Proposition 13 base rate | 1.00% of assessed value | Statewide. Assessed value resets to purchase price on a change of ownership, then rises no more than 2% a year. |
| Voter-approved bonds & overrides | Roughly 0.05%–0.10% | School and local bond measures. Varies by tax rate area, not by city as a whole. |
| Direct assessments | Fixed dollar amounts | Lighting, landscaping, vector control, flood control. Appear as line items, not percentages. |
| Mello-Roos (CFD), where applicable | Varies widely; often $1,500–$4,000+/yr | Only in districts that have one. Most established Simi Valley tracts do not; newer construction elsewhere in the county often does. |
| Effective all-in rate | Commonly ~1.05%–1.10% | Base plus bonds and assessments, before any CFD. |
What that looks like on a real number
The median single-family sale price in Simi Valley was $836,000 in June 2026 across 85 closed sales (Chicago Title Market Trend Report, June 2026 full-value sales, pulled 2026-08-15). Applying the rates above:
| Line | Amount |
|---|---|
| Purchase price (June 2026 median single-family sale) | $836,000 |
| Annual tax at 1.00% (Prop 13 base only) | $8,360 |
| Annual tax at 1.05% effective | $8,778 ($732/month) |
| Annual tax at 1.10% effective | $9,196 ($766/month) |
These are illustrations, not a quote. Your actual bill depends on your tax rate area and any assessments on the specific parcel. Verify with the Ventura County Assessor and the Ventura County Tax Collector for the APN before relying on a figure.
Mello-Roos in Simi Valley
Most established Simi Valley neighborhoods carry no Mello-Roos community facilities district. Newer master-planned construction — more common in the Santa Clarita Valley and parts of Ventura County than in Simi — frequently does, and a CFD can add thousands per year on top of the ad valorem rate. Because it is parcel-specific, the only reliable check is the tax bill and the CFD disclosure for the exact address.
What resets the assessment — and what does not
A sale resets the assessed value; most remodels do not, though new square footage is assessed as new construction. Transfers between parents and children, and base-year transfers for homeowners over 55, are governed by Proposition 19 — see the Prop 19 guide for how those work and what the filing deadlines are.
Frequently Asked Questions
What county is Simi Valley in for property tax purposes?
Ventura County. The Ventura County Assessor sets assessed values and the Ventura County Treasurer-Tax Collector bills and collects. Simi Valley is not in Los Angeles County, despite sitting on the county line.
What is the property tax rate in Simi Valley?
The Proposition 13 base rate is 1% of assessed value statewide. With voter-approved bonds and direct assessments, the effective rate in Simi Valley commonly lands around 1.05%–1.10%, before any Mello-Roos district that may apply to a specific parcel.
How much is property tax on a median-priced Simi Valley home?
On the $836,000 June 2026 median, 1.05% is about $8,778 a year, or roughly $732 a month. At 1.10% it is about $9,196 a year.
When are California property taxes due?
The first installment is due 1 November and delinquent after 10 December; the second is due 1 February and delinquent after 10 April. Most owners with a mortgage pay through an impound account rather than directly.
Does buying reset my property taxes?
Yes. A change of ownership re-assesses the property at its purchase price, which is why a long-held neighbouring home can carry a much lower bill than a recent purchase on the same street.
Do most Simi Valley homes have Mello-Roos?
Most established tracts do not. Mello-Roos is district-specific, so it has to be checked parcel by parcel — the tax bill and the CFD disclosure are the two documents that settle it.
