When you buy or sell a home in Carlsbad, property taxes are prorated at closing so each party pays only for the portion of the fiscal year they actually owned the home. San Diego County's tax year runs July 1 through June 30, with bills due in two installments, November 1 and February 1. Your escrow company calculates the exact split and adjusts it on your closing statement.
This overview is provided by Carrie Filla, Broker Associate with the Felicia Lewis Group, serving Carlsbad and North County Coastal San Diego for more than 30 years.
Property tax proration is one of those line items that shows up on every closing statement but rarely gets explained ahead of time. Whether you're buying or selling in Carlsbad, understanding how the math works, and why a supplemental tax bill might show up later, helps you avoid surprises after closing.
How Does Property Tax Proration Work in San Diego County?
Property taxes are billed for the county's fiscal year, which runs July 1 through June 30. When a home sells partway through that year, the seller is responsible for taxes up through the closing date, and the buyer takes over from there. Escrow calculates each side's share based on the closing date and the current tax roll, then adjusts it as a credit or debit on the closing statement.
What Are San Diego County's Property Tax Due Dates?
Installment | Due Date | Delinquent After |
|---|---|---|
First | November 1 | December 10 |
Second | February 1 | April 10 |
Fiscal Year | July 1 to June 30 | — |
Regular secured tax bills are typically mailed in the fall. If your closing happens before the current year's bill is available, escrow often uses the prior year's bill as a working estimate for proration purposes.
Why Might You Get a Supplemental Tax Bill After Closing?
California reassesses a property's value when ownership changes. If your purchase price results in a higher assessed value than what the seller was paying taxes on, San Diego County issues a supplemental tax bill covering the difference for the remaining months of the fiscal year. This bill is:
- Separate from your regular secured property tax bill
- Based on the difference between the old and new assessed value
- Often mailed weeks to months after closing, so it can catch new owners off guard
What This Means for Carlsbad Buyers and Sellers at Closing
Proration itself is handled for you, your escrow officer runs the calculation and it appears on your closing statement before you sign. The part worth planning for is the supplemental bill, since it arrives separately and isn't part of your regular tax schedule. For a full walkthrough of the rest of the closing process, see Carrie's escrow process guide. If you're just getting started, her buyers guide and sellers guide walk through what to expect at every stage.
Frequently Asked Questions
Who pays the property taxes at closing when you buy or sell in Carlsbad?
Both parties do, just for different portions of the fiscal year. The seller is responsible for property taxes up through the closing date, and the buyer takes over from that date forward. Your escrow company calculates the exact proration based on San Diego County's tax roll and shows it as a credit or debit on your closing statement, so neither side pays for time they didn't own the home.
What is a supplemental property tax bill in Carlsbad?
It's a separate bill issued by San Diego County after your property is reassessed due to the change in ownership. If your purchase price results in a higher assessed value than the seller's, the county bills the difference for the remaining months of the fiscal year. It typically arrives weeks to months after closing, separate from your regular secured tax bill, so it's worth budgeting for in advance.
Will buyers in Aviara or Bressi Ranch owe a larger supplemental tax bill?
It depends on the gap between the seller's prior assessed value and your purchase price, not the neighborhood itself. Because homes in communities like Aviara and Bressi Ranch have appreciated significantly, that gap, and the resulting supplemental bill, can be larger than in neighborhoods with less price movement. Ask your escrow officer or the county assessor for an estimate before you close.
Carrie Filla | Broker Associate
Felicia Lewis Group | Real Broker, Luxury Division
Serving Carlsbad, Aviara, Poinsettia Park, Encinitas, and North County Coastal San Diego.
30+ years in real estate. 700+ clients helped buy and sell. $800M+ in lifetime sales. Licensed since 1997.
This article is for general informational purposes only. Exact proration amounts and supplemental tax bill figures depend on your specific closing date and assessed value. Confirm final numbers with your escrow officer or the San Diego County Assessor's Office.
