Built for California. Not for everywhere.
Most financial calculators are built for a national audience. They use average figures, ignore state-specific rules, and leave California residents guessing. California Money Tools fixes that.
Why this site exists
California’s property tax system runs on rules most national calculators don’t even attempt: Proposition 13’s base-year value and 2% annual assessment cap, a Homeowners’ Exemption that’s easy to forget to claim, Mello-Roos and Community Facilities District taxes that vary block by block, and 58 counties that each layer on their own voter-approved debt.
Whether you’re a first-time buyer trying to understand why your first tax bill doesn’t match the seller’s, a longtime owner wondering how a Proposition 19 base-year transfer would work if you moved, or a homeowner deciding whether an assessment appeal is worth filing, the answers are rarely simple. California Money Tools builds the calculators that make those answers clear.
California Money Tools is a focused collection of free calculators built specifically around California’s actual tax rules and exemptions. Nothing more, nothing less.
How we build these tools
California-specific inputs
Every calculator uses California’s actual Prop 13 mechanics, county rates, and exemption rules – not national averages.
Kept current
California property tax law, exemption amounts, and county rates change. When they do, we update the tools.
No data collected
All calculations run entirely in your browser. We never see your numbers and never store them.
No account required
No signup, no paywall, no email capture. Open the tool, enter your numbers, get your answer.
What these tools are – and aren’t
These calculators are designed to give you a solid, informed estimate so you can think through your options clearly. They are not a substitute for professional tax, legal, or financial advice, and they don’t account for every individual situation – Mello-Roos and CFD charges in particular are too local to estimate from assessed value alone.
Property tax rules in California are set partly by state law and partly at the county level, and they can change. We always recommend confirming important decisions with a qualified professional or your local county assessor directly.
Disclaimer
California Money Tools provides estimates for informational purposes only. Nothing on this site constitutes tax, legal, or financial advice. Always consult a qualified professional before making financial decisions. Rates and rules are subject to change – contact your local county assessor for the most current official information.