San Diego Property Taxes Explained

Property taxes are one of the most misunderstood parts of buying or selling a home in California — and getting them wrong can throw off your budget by thousands of dollars a year. The good news: once you understand a few core rules, San Diego property taxes are actually quite predictable. Here's how they really work.

This is general education, not tax or legal advice — always confirm specifics with the San Diego County Assessor or a tax professional for your situation.

Proposition 13: The Foundation

California's Proposition 13 sets the base property tax rate at 1% of a property's assessed value, and — importantly — limits how much your assessed value can rise each year to a maximum of 2% annually, regardless of how fast the market climbs. This is why long-time San Diego owners often pay far less in taxes than a neighbor who bought recently: their assessed value has been capped for years.

On top of the 1% base, you'll see voter-approved local bonds and assessments — for schools, infrastructure, and community services. That's why the effective property tax rate in most San Diego neighborhoods lands a bit above 1% (commonly in the range of roughly 1.05%–1.25% of assessed value, varying by tax-rate area).

What Happens When You Buy: Reassessment

When a home sells, it's reassessed to the new purchase price. That becomes your new base-year value, and the 2% annual cap starts over from there. So if you buy a home for $1,000,000, your assessed value resets to roughly that amount — not whatever the previous owner was paying taxes on. New buyers should always budget based on the purchase price, not the seller's current tax bill.

The Supplemental Tax Bill

Here's the one that surprises first-time buyers most: after closing, you'll receive a one-time supplemental tax bill that accounts for the difference between the seller's old assessed value and your new (usually higher) one, prorated for the portion of the year you own the home. It arrives separately from your regular bill — set money aside for it so it isn't a shock.

Mello-Roos and Special Assessments

Many of San Diego's newer, master-planned communities carry Mello-Roos taxes (formally, Community Facilities District or "CFD" assessments). These fund the infrastructure — roads, schools, parks — that made the community possible, and they're added on top of your base property taxes.

You'll frequently find Mello-Roos in newer developments such as parts of Carmel Valley, 4S Ranch, Del Sur, Otay Ranch, and similar planned areas. They can add a meaningful amount to your annual bill, and they eventually expire (though the timeline varies by district). If you're comparing two homes at the same price, Mello-Roos can make a real difference in your monthly cost — always ask.

Proposition 19: Transfers and Exemptions

Proposition 19 changed the rules around transferring a property's tax basis. Two things worth knowing:

• Homeowners 55+ (or those who qualify due to disability or disaster) can transfer their existing lower assessed value to a replacement home in California, within certain limits — valuable if you're downsizing but worried about a higher tax bill.
• Parent-to-child transfers are more limited than they used to be. The inherited property generally must become the child's primary residence to keep the low tax basis, and even then there are value caps.

These rules have real financial consequences for move-up sellers and families planning ahead — it's worth a conversation with a qualified advisor before you make a move.

When Are Property Taxes Due?

San Diego County property taxes are paid in two installments. The first is due in the fall and becomes delinquent after December 10; the second is due in the winter/spring and becomes delinquent after April 10. Many homeowners pay through an impound (escrow) account bundled into their mortgage payment.

Why This Matters for Your Sale or Purchase

For sellers, understanding the buyer's future tax picture helps you anticipate questions and price competitively — especially in Mello-Roos communities. For buyers, budgeting on the real, reassessed number (plus any special assessments) prevents an unpleasant surprise after closing. Either way, the tax line is a bigger part of the monthly picture than most people expect.