Prop 19: Moving Your Property Tax Basis When You Move

If you bought your Bay Area home years ago, your property tax bill is probably based on a much lower value than what your home is worth today. That low tax basis is one of the main reasons longtime homeowners hesitate to move — selling could mean losing it and starting over at today's prices. California's Proposition 19, approved by voters in 2020, changed that picture for many homeowners.

What Prop 19 does

Prop 19 allows eligible homeowners to transfer their existing property tax basis — the assessed value their taxes are calculated from — to a replacement home anywhere in California. Before Prop 19, this kind of transfer was far more limited. Now, qualifying homeowners can move across counties without giving up the tax advantage they built up over the years.

Who qualifies

The transfer is available to homeowners who are 55 or older, people with severe disabilities, and victims of wildfires or other natural disasters whose homes were destroyed. The replacement home must become your primary residence, and the purchase and sale generally need to happen within two years of each other.

What happens if the new home costs more?

If your replacement home is worth more than your old one, you don't lose the benefit entirely — but the difference in market value gets added on top of your transferred basis. In other words, you keep your old assessed value and only pay the higher rate on the extra amount. If the new home costs the same or less, your basis typically carries over in full.

Why this matters in the Bay Area

Many Tri-Valley and East Bay homeowners bought decades ago and now want to downsize, move closer to family, or relocate to a more affordable part of the state — without a shocking new tax bill. Prop 19 makes those moves far more realistic. It also matters for estate planning: the rules changed for how property transfers to children, so it's worth understanding both sides.

What to do before you decide

• Confirm your eligibility with your county assessor's office — rules and filing deadlines apply.
• Talk to a tax professional about how the transfer affects your specific situation, including any plans to pass the home to family later.
• Get a realistic picture of your current home's value and what a replacement home would cost, so you can compare the full financial picture — not just the tax piece.

Prop 19 opened a door that used to be mostly closed. If you've been staying put mainly because of your tax basis, it's worth a conversation to see whether a move makes sense for you now.