Do you pay supplemental tax every year?
Andrew Ramirez
Published Feb 14, 2026
Supplemental bills are separate and in addition to the annual tax bills. They are not sent to a lender for payment. The property owner is responsible for ensuring that the supplemental bills are paid on time. If you have questions about property valuations, visit the County Assessor’s website.
Is supplemental tax a one time thing?
Simply put, a Supplemental Tax Bill is a one-time bill that pays the County the difference between what the taxes were for the seller, and what they are now for the buyer.
What does a notice of supplemental assessment mean?
A Notice of Supplemental Assessment is generated whenever the assessed value of a property changes due to a change in ownership or the completion of new construction. Such reassessments may result in one or more Supplemental Tax Bills being mailed to the property owner.
Will my property taxes go up if I refinance in California?
The sale of a property can trigger a tax assessment in some places, including California. However, a refinance loan is not a sale because the property is not changing hands. So refinancing your mortgage loan won’t cause your property taxes to change.
When do you pay supplemental taxes in California?
No, unlike your ordinary annual taxes, the supplemental tax is a one time tax which dates from the date you take ownership of your property or complete the construction until the end of the tax year on June 30. The obligation for this tax is entirely that of the property The Title Consumer is published by the California Land Title Association.
Why did I get a supplemental tax bill when I bought my house?
If you received a supplemental tax bill it’s because the records at the county assessor’s office has not caught up with the new value of the property. For example, if the seller bought their property in the 80’s for $150,000 then their bill for the year might have been $2000. If you bought the home for $600,000 your taxes should be around $7,500.
When did supplemental property taxes start in California?
They have been with us since July of 1983, but you and your neighbors still may not know what they are, what they do, and how they affect you and your property. To help you better understand this confusing subject, the California Land Title Association has answered some of the questions most commonly asked about supplemental real property taxes.
How much will supplemental property taxes affect me?
This property tax revision is expected to produce over $300 million per year in revenue for schools. How will Supplemental Property Taxes affect me? If you don’t plan on buying new property or undertaking new construction, this new tax will not affect you at all.