Chatsworth property tax is the second-largest line item for most buyers after mortgage. Understanding what you'll actually pay matters for monthly carry, escrow setup, and how the tax changes when you buy. I'm Brian Cooper at eXp Realty, and this is the 2026 breakdown of Chatsworth property tax.
The Base Rate Under Prop 13
California's Proposition 13 sets the base property tax rate at 1% of assessed value. Assessed value at acquisition is the sale price; subsequent increases are limited to 2% per year regardless of market value changes. The reset to sale price at acquisition is the most important Prop 13 mechanic for new buyers.
Long-time owners typically have base assessments well below current market value, paying lower tax than recent buyers. The buyer at $1.05M today pays roughly $10,500 in annual base property tax; the seller who bought in 1998 may be paying $4,500.
Voter-Approved Bonds
On top of the 1% base, LA County voters have approved various bond measures for schools, infrastructure, and other purposes. These typically add 0.10-0.20% to the effective rate. For a Chatsworth buyer at $1.05M, voter bonds add roughly $1,050-$2,100 annually.
Specific bonds vary by tax rate area. Pull a property tax bill or LA County Assessor record for the exact breakdown by parcel.
Mello-Roos by Tract
Mello-Roos special assessment districts fund infrastructure in some newer developments. Chatsworth has limited Mello-Roos exposure compared to neighboring Porter Ranch (where many tracts have Mello-Roos). Older Chatsworth tracts generally do not. Newer infill or specific developments may.
Verify Mello-Roos status for any specific property. The seller's disclosure should identify any active special assessment. Pull a current tax bill to see the breakdown.
The Effective Rate
Combined base, voter bonds, and any Mello-Roos: effective annual property tax rate in Chatsworth typically runs 1.10-1.25% of sale price. On a $1.05M home, that's $11,550-$13,125 annually, or roughly $960-$1,095 monthly added to mortgage payment.
Monthly carry calculation should include this. Many buyers underestimate property tax because they look only at the base 1% rate.
| Component | Typical Rate | On $1.05M |
|---|---|---|
| Prop 13 base | 1.00% | $10,500 |
| Voter bonds | 0.10-0.20% | $1,050-$2,100 |
| Mello-Roos | 0-0.05% typical Chatsworth | $0-$525 |
| Total effective | 1.10-1.25% | $11,550-$13,125 |
Supplemental Tax Bill
When you buy, the Assessor reassesses your property to the sale price. The county sends a supplemental tax bill covering the difference between the prior assessment and your new assessment, prorated from your purchase date to the end of the fiscal year. This bill arrives separately from the regular tax bill, often 4-12 months after close.
Budget for the supplemental bill. Many first-time buyers are surprised by it. The amount depends on how long after the last reassessment you bought and the size of the assessment increase.
Exemptions and Programs
Homeowner's Exemption: $7,000 off assessed value for owner-occupied homes — saves about $70 annually. File with the Assessor after close. Prop 19: over-55 sellers can transfer base year value to a replacement home of equal or lesser value statewide. Disabled veterans and certain other categories have additional exemptions.
Veterans, disabled persons, and senior buyers should evaluate which exemptions apply. The savings can be meaningful over time.
Frequently Asked Questions
What's the property tax rate in Chatsworth?
Effective annual rate typically 1.10-1.25% of sale price including the Prop 13 base of 1%, voter-approved bonds (0.10-0.20%), and any Mello-Roos. On a $1.05M home, that's roughly $11,550-$13,125 annually or $960-$1,095 monthly added to mortgage payment.
Will my Chatsworth property taxes go up after I buy?
Your assessment resets to sale price at acquisition under Prop 13. Subsequent annual increases are limited to 2% per year regardless of market value changes. Long-term, your tax is more predictable than market-driven systems but starts at your purchase-price-based rate.
Do Chatsworth homes have Mello-Roos?
Limited exposure compared to neighboring Porter Ranch. Older Chatsworth tracts generally do not have Mello-Roos. Newer infill or specific developments may. Verify Mello-Roos status for any specific property via the seller's disclosure and a current tax bill.
What's a supplemental tax bill?
When you buy, the Assessor reassesses to sale price and sends a supplemental bill covering the difference between the prior assessment and your new assessment, prorated from purchase date to end of fiscal year. This arrives separately from the regular bill, often 4-12 months after close. Budget for it — many first-time buyers are surprised.
Can I transfer my old property tax to a new Chatsworth home?
Under Prop 19, over-55 sellers (and certain other categories) can transfer their existing base year value to a replacement home of equal or lesser value statewide. This is meaningful for downsizers and Bay Area or Westside sellers trading down to Chatsworth. Specific eligibility and timing requirements apply — consult a tax professional.
