California Mortgage Calculator

What Is a PITI Mortgage Calculator for California?

A PITI mortgage calculator for California breaks your monthly housing cost into Principal, Interest, Taxes, and Insurance — the four components a lender collects through your monthly escrow payment. In California, PITI is especially important because home prices are high, property tax rules are unusual, and insurance costs in wildfire-prone regions can rival the principal-and-interest payment on a home in another state. The calculator above locks in the 0.75% California average property tax and shows the full PITI breakdown for any home price, down payment, rate, and term.

California's effective property tax rate looks low at roughly 0.75%–1.0%, but that figure is held down by Proposition 13, which caps annual assessed-value growth at 2% per year for owners who stay. When you buy a home, the property is reassessed at the full purchase price, so your tax bill — and your monthly escrow — is based on the new market value, not the seller's long-held lower assessment. Budget for the full purchase-price rate, not the seller's current tax bill.

Proposition 13, Supplemental Tax Bills & Conforming vs. Jumbo Loans

Proposition 13, passed in 1978, limits the assessed value of California property to its 1975 base-year value plus no more than 2% annual inflation growth, and caps the property tax rate at 1% of assessed value plus voter-approved local bonds and assessments. For a long-term owner, this keeps property taxes remarkably stable. But a sale triggers a full reassessment at the purchase price, and you will receive a one-time supplemental tax bill shortly after closing that covers the difference between the seller's assessed value and your new purchase price for the remainder of the fiscal year. Plan for this supplemental bill as an additional closing-period cost.

Because California home prices are high, many loans exceed the conforming loan limits set by Fannie Mae and Freddie Mac (which vary by county and are highest in high-cost metros). A conforming loan qualifies for standard rates and mortgage insurance rules; a jumbo loan — above the county limit — typically requires a larger down payment (often 20%+), a stronger credit profile, and stricter debt-to-income limits, and it may carry a slightly different rate. Use the calculator to model both scenarios by adjusting the home price and down payment.

California insurance is another major PITI factor. Wildfire risk in many parts of the state has driven premiums sharply higher, and some insurers have restricted or withdrawn coverage in high-risk zones, pushing buyers to the FAIR Plan (California's insurer of last resort) at a premium. Lenders require full replacement-cost coverage, and in high-risk fire zones you may need a separate wildfire policy on top of a standard homeowners policy. Always get an actual insurance quote and enter it in the calculator's insurance field rather than relying on the default.

All figures are estimates for informational and planning purposes only and do not constitute financial, tax, or mortgage advice. Confirm final rates, taxes, and insurance with your lender, county assessor, and a licensed insurance agent.