Supplemental Tax Calculator | Optimize Your Property Tax Estimates Today

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Los Angeles County Supplemental Tax Calculator

Estimate the extra property tax that may be due after buying a home or completing new construction.

Good to know: If the event happened from January 1 through May 31, California generally issues two supplemental bills. This calculator includes both automatically.

What happened? Close of escrow date Use the date the purchase closed. Purchase price / new assessed value ($) If you do not yet have the Assessor's new value, the purchase price is usually a reasonable estimate. Assessed value from the existing tax bill ($) Use the assessed value shown on the property's current annual property tax bill — not the amount of tax due. Property tax rate (%) If you do not know your exact rate, leave this at 1.00%. Your actual LA County rate may be higher because of voter-approved debt.

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This estimator does not automatically apply exemptions, exclusions, direct assessments, Mello-Roos, or other property-specific charges.

Estimate only. The Los Angeles County Assessor determines assessed values, and the Auditor-Controller applies the tax rate. Your actual bill may differ.

Los Angeles County Supplemental Tax Calculator

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