Prop 19 Explained: Property Tax Rules for Moving or Inheriting a Home in San Diego County

Since 1999, I've seen that nothing surprises families more than a property tax bill after a move or an inheritance. Proposition 19, which California voters passed in November 2020, changed two big rules: how long-time owners can move and keep their low tax base, and how families can inherit a home. Here's a plain-English look. I'm a real estate broker, not a tax advisor or attorney, so please confirm your own situation with one.

Why Your Property Tax Base Matters

In California, your property tax is based on your home's "base year value," not necessarily today's market value. In North San Diego County, where the median sales price hit $1,020,000 in September 2026 (NSDCAR Marketwatch), someone who bought years ago may have a taxable value far below market value. A change in ownership can reset it, which is why Prop 19 matters.

Part 1: Moving? Take Your Tax Base With You (Age 55+)

Under Prop 19, homeowners who are 55 or older, severely and permanently disabled, or victims of a wildfire or natural disaster can transfer their existing taxable value to a replacement home. According to the California Board of Equalization (BOE) (BOE Proposition 19):

• Anywhere in California. The replacement home can be in any county, not just San Diego County.
• Up to three times. You may use the transfer up to three times during your life.
• Within two years. You must buy or build the replacement home within two years of selling the original one.
• Principal residences only. Both homes must be your principal residence.
• Any price, with an adjustment. If the new home is of "equal or lesser value," your base value transfers unchanged. That means 100% of the old home's market value if you buy before selling, 105% if you buy in the first year after the sale, and 110% in the second year. Any amount above that is added to your transferred value.

Example (my own math, for illustration): Say you sell for $1,200,000 and your taxable value is $400,000. You buy a $1,300,000 home within the first year. The 105% limit is $1,260,000, so the $40,000 above it is added: your new taxable value becomes $440,000, instead of $1,300,000. Actual calculations include annual inflation adjustments, so your assessor will figure the exact number.

Important Details Sellers and Buyers Miss

• You must file a claim. It's not automatic and it isn't done through escrow. You file after both transactions are complete and you're living in the new home, with the county assessor where the replacement home is located. The BOE's filing checklist lists form BOE-19-B for age 55 and older, due within three years of buying the replacement home.
• Buying first is allowed, with a cost. If you buy before you sell, you'll pay property tax on the full market value of the new home until the old one sells, with no refund for that time.
• A child can be on title. If your child is on title with you, you can still transfer the base value, as long as you were an owner of the original home and are a purchaser of the new one.

Part 2: Inheriting a Home

Before Prop 19, children could inherit a parent's home and keep the parent's low tax base regardless of how they used it. Now the rules are narrower. The BOE says the exclusion applies only to a family home that was the parent's principal residence and becomes the child's principal residence, or to a family farm (BOE Prop 19 FAQs). Key points:

• The child has to move in. At least one inheriting child must live there as a principal residence and file for the homeowners' exemption within one year.
• Rentals don't qualify. Transfers of rental homes between parents and children are not excluded.
• There's a value cap. The exclusion covers the home's taxable value plus $1,044,586 for transfers from February 16, 2025 through February 15, 2027. Anything above the cap is added to the taxable value.
• Moving out ends it. If the inheriting child stops using it as a principal residence, the home gets a new taxable value based on its market value when inherited, adjusted for inflation.
• There are filing deadlines. Form BOE-19-P is due within three years of the date of death or transfer, or before the home is sold to a third party, whichever is earlier.

Example (my own math): A parent's home has a taxable value of $300,000 and a market value of $1,600,000. The cap is $300,000 + $1,044,586 = $1,344,586. The $255,414 above the cap is added, making the new taxable value $555,414, not $1,600,000. This is an illustration only, so check the numbers with the assessor.

Real-Life Situations I See in North County

• Empty nesters in Carlsbad or Vista who want to downsize closer to family. The base value transfer can make a smaller home or a move to another county much cheaper to hold.
• Families inheriting a parent's home and deciding whether to move in, keep it as a rental, or sell. The rules reward moving in and penalize renting it out.
• Heirs who plan to sell. If you inherit and then sell, ask a CPA about the income tax side of the sale. The BOE also notes that an inherited home you own and live in can count as the "original home" for a base value transfer if you're 55 or older and meet the other requirements.

Frequently Asked Questions

Does Prop 19 apply to me if I'm under 55? The base value transfer doesn't, unless you're severely disabled or a disaster victim. The inheritance rules apply to transfers from a parent to a child and, in some cases, from a grandparent to a grandchild.

Can I transfer my tax base to a more expensive home? Yes, but the amount above the "equal or lesser value" limit is added to your transferred value.

Is the transfer automatic at closing? No. You file a claim with the county assessor after both transactions close and you've moved into the new home.

Where do I get the forms? Claim forms come from the county assessor where the replacement home is located. The BOE's Prop 19 page lists the forms and deadlines (BOE).

Do I need an attorney or CPA? For anything involving a trust, an estate or a large inheritance, I strongly suggest it. Rules, dollar limits and procedures can change.

Thinking About a Move or an Inherited Home?

I'll help you work out the real estate side: what your home is worth, what it would cost to move, and how the timing might fit with the Prop 19 deadlines. Call or text me at 760-521-4880.

This article is general information, not tax or legal advice. BOE guidance and dollar limits can change, so confirm with the county assessor and a qualified professional.

Eddie Lagunas, Broker Associate, eXp Realty | DRE #01273510 | 760-521-4880