Real estate in San Francisco, by The Fuller Team
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Owning

Prop 19 Calculator: What Your Prop 13 Number Is Worth When You Move

Prop 19 was a win. The old senior transfer rules almost never worked, and most people who looked into them gave up. Prop 19 fixed that, and the price of fixing it was the old parent-to-child inheritance break, which it narrowed. Both halves are true. Neither one changes the math for a 55-year-old thinking about the next move, which is the math below.

One thing before the numbers: we sell real estate. We are not tax or financial advisors, and nothing here replaces a conversation with your CPA, your financial planner or the Assessor. Use this to decide whether that conversation is worth having.

How Prop 19 moves your tax base: the 100, 105 and 110 percent test, and two examples, buying down and buying up, at San Francisco's 2026–27 rate.

Read on to learn:

  • 🧮 The calculator: what your Prop 13 number is worth if you move now, this year and over the years you plan to stay.
  • 🧾 Why that number is an asset with a dollar value, and how to find yours on your bill.
  • 🧑‍🦳 Who qualifies: the age, the house, and the day that counts.
  • 📐 The 100 / 105 / 110 test, and why buying up is still a deal.
  • 🗺️ Three moves, anywhere in California, no county permission required.
  • 👪 The tradeoff: what changed for parents and kids, and the $1,044,586 line.
  • 📋 The filing, the deadlines, and the mistakes we see.
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