The local tax guide · California
Los Angeles County
property tax, explained.
The seller’s tax bill is not a reliable budget for a new Los Angeles County owner. Start with the taxable assessed value, then account for local bonds, direct assessments and any separate supplemental bill.
Sources reviewed
Follow the dollars
Separate the base levy from the full annual bill
At $800,000 of taxable assessed value, the 1% general levy is $8,000. If a hypothetical parcel also had a 0.20% debt rate and $500 of direct assessments, its annual illustration would be $800,000 × 1.20% + $500 = $10,100. The 0.20% and $500 are teaching inputs, not rates or charges verified for your address.
Annual percentage-based tax plus the direct assessments you enter. Excludes supplemental bills, penalties, interest and any charges you have not entered. Default result is the 1% general levy only.
Use the inputs from your record
Los Angeles County tax calculator
Annual illustration
$8,000.00
Using the starting example inputs.
- Taxable base
- $800,000.00
- Value-based tax
- $8,000.00
Annual percentage-based tax plus the direct assessments you enter. Excludes supplemental bills, penalties, interest and any charges you have not entered. Default result is the 1% general levy only.
Match the value and rate year. Calculations happen in your browser; this form does not submit your inputs.
Find the parcel and read the annual bill in parts
Start with the county Property Tax Portal and its Property Address Search to identify the Assessor’s Identification Number (AIN). Match that number and the fiscal year to the annual secured bill.
The portal explains three ingredients: the general 1% levy, voter-approved debt rates and direct assessments. A direct assessment is a separate dollar charge; it does not belong in the percentage-rate input. Enter exemptions only through the taxable assessed value, so the same reduction is not counted twice.
Use the Assessor’s Homeowners’ Exemption instructions to check eligibility and filing. The calculator does not assume that occupying the property alone means every exemption has already been approved.
Why a buyer can receive another tax bill after closing
The Tax Collector’s new-owner guide explains that a reassessment can generate supplemental taxes in addition to the annual secured bill. A supplemental bill does not replace the annual bill, and it can arrive separately from the amount your lender is already collecting.
The county says supplemental bills go to the property owner even when there is an impound account. Confirm with your servicer whether it will pay that specific bill; do not assume it is included in escrow. Keep the purchase date, annual bill and any supplemental notice together.
For a purchase estimate, use the official portal’s Supplemental Tax Estimator link. The annual calculator here does not prorate a purchase event or predict when the county will issue a notice.
A simple supplemental-assessment illustration
Suppose a reassessment changes a property’s value from $500,000 to $800,000. The difference is $300,000. At a hypothetical 1.20% annual rate, that difference represents $3,600 for a full year; the supplemental period still has to be determined.
The California Board of Equalization explains how supplemental events and notices work. Purchase or construction timing matters, so neither $3,600 nor the annual calculator result is a promised supplemental bill. A lower reassessed value can instead produce a refund.
Send the question to the office that can fix it
For assessed value or exemptions, contact the Assessor. For payments and balances, contact the Treasurer and Tax Collector. For an assessment dispute, use the portal’s Assessment Appeals Board links.
Before asking for help, note whether the document is an annual bill, supplemental bill or assessment notice. Record its fiscal year and AIN, then explain the field you believe is wrong. Check the applicable appeal instructions and deadline for that notice type; a billing inquiry is not an assessment appeal.
Sources and review scope
Property Tax Almanac checked these official sources on September 26, 2026. Illustrative inputs are labeled; this review does not establish every parcel’s current rate or individual eligibility.
- Los Angeles County Property Tax Portal — General levy, debt rates, direct assessments, parcel lookup and office responsibilities.
- Tax Collector’s new-owner guide — Annual versus supplemental bills and impound-account warning.
- California supplemental assessments — Supplemental events and the assessment notice process.
The calculator divides the taxable base by 100, multiplies by the entered rate and rounds to cents, then adds the separate dollar charges entered. It is a bill-checking tool, not an official tax determination. Other site tools may use different benchmark assumptions.
Report a correction with the page, tax year and official source. See our data methodology or return to California counties.