Prop 13 vs. Prop 19: California Property Tax Guide (2026)

California real estate runs on two constitutional amendments every licensee must understand. Proposition 13 (1978) caps property tax at 1% of assessed value, limits annual increases to 2% or the California CPI rate, whichever is lower, and resets assessment to full market value only on sale or new construction. Proposition 19 (effective February 16, 2021) changed two major things: it restricted the parent-child exclusion that previously sheltered inherited vacation homes and rental properties, and it expanded portability so homeowners age 55 and older can carry their Prop 13 assessed value with them anywhere in California. For buyers and sellers, these two propositions affect monthly housing costs and move decisions more than almost anything else in California real estate law. For the DRE exam, Prop 13 and Prop 19 are guaranteed to appear in the Transfer of Property section (8% of the 150-question exam) and in property valuation calculations.

Voters passed Proposition 13 on June 6, 1978, amending the California Constitution by adding Article XIII-A. Before it passed, local governments assessed and taxed real property at current market value every year. During the rapid appreciation of the 1970s, many California homeowners saw their annual tax bills double or triple while their incomes stayed flat — which drove a two-to-one majority for the initiative. Three rules define Prop 13: 1. The 1% base rate: The maximum property tax for any California property is 1% of assessed value. Local voter-approved bonds, Mello-Roos special taxes, and school district levies are added on top. Most California homeowners pay 1.05%–1.35% total, but the constitutional floor is always 1%. 2. The 2% annual adjustment cap: Assessed value can increase no more than 2% per year, or the California Consumer Price Index (CPI) percentage change, whichever is lower. In low-inflation years, assessed values may barely move. When inflation runs high, the 2% ceiling takes over. 3. The reassessment trigger: Assessed value resets to full market value only on a change of ownership or new construction. A deed transfer that shifts beneficial interest in a property — typically a sale — triggers reassessment for the following tax year. The cumulative result is dramatic: a homeowner who bought in 1990 for $250,000 might have an assessed value near $520,000 today, while a buyer next door who paid $1.4 million in 2022 pays taxes on $1.4 million. Same house, property taxes nearly three times higher for the newer buyer. This is what real estate professionals call the "golden handcuffs" — it financially penalizes long-time owners who sell and buy again.

Property tax rules under Prop 13 appear on the DRE exam and come up in nearly every California transaction. The formula agents need cold: (Purchase Price x 0.01) / 12 = estimated monthly base property tax. Example: A $900,000 purchase generates approximately $9,000 per year in base property tax — about $750 per month. Add local bonds and Mello-Roos assessments and the realistic number for many California buyers is $9,500–$12,000 per year. For property tax proration and all the exam math formulas together, see California real estate exam math formulas. Two buyer-facing details agents should always mention: Supplemental property tax bill: When a property sells at a price above the previous assessed value, the county issues a supplemental tax bill for the difference, prorated from the sale date through June 30 of the current fiscal year. Buyers typically receive one or two supplemental bills in the first six months after purchase. This is not a penalty — it is the system adjusting to the new Prop 13 base. Agents who do not mention it generate surprised calls from clients. The golden handcuffs problem: Long-time owners with low assessed values often resist selling because any new purchase gets reassessed at the full market price. A seller who has paid taxes on a $300,000 assessed value for 25 years and then buys a $1.2 million home sees their property tax bill roughly quadruple overnight. This reluctance suppresses inventory across California — and it is exactly the problem Prop 19's portability rules were designed to ease.

Voters passed Proposition 19 on November 3, 2020. Its two major rule sets have different effective dates: February 16, 2021: New parent-child (and grandparent-grandchild) transfer exclusion rules took effect. April 1, 2021: New base year value portability rules took effect. Before Prop 19, California law — primarily Proposition 58 (1986) and Proposition 193 (1996) — allowed parents to transfer property to children with no reassessment for: (1) the primary residence at any value, plus (2) up to $1 million in combined assessed value for all other property. A parent could hand a beach house, a rental duplex, or a commercial storefront to their child, and the child could keep the Prop 13 base indefinitely — even while renting the property out — with no occupancy requirement. Prop 19 eliminated this broad protection. As of February 16, 2021, special property transfers to heirs qualify for the parent-child exclusion ONLY if: 1. The transferred property is the parent's primary residence — not a vacation home, rental, or investment property. 2. The child uses the inherited home as their primary residence within one year of the transfer. 3. The market value does not exceed the parent's Prop 13 assessed value by more than $1 million. If it does, the excess above that $1 million threshold is added to the child's taxable assessed value. Non-primary-residence property — rental houses, vacation homes, investment parcels — is now fully reassessed to market value when transferred to children or grandchildren. Agents working with estate clients, trustees, and families doing intergenerational planning need to communicate this change clearly.

The difference between the old and new rules comes into sharp focus on high-value properties. BEFORE Prop 19 (transfers before February 16, 2021, governed by Prop 58): • Primary residence transferred at any value: no reassessment • Other property up to $1 million combined assessed value: no reassessment • No occupancy requirement — child could immediately rent the inherited home • Grandparent-to-grandchild transfers also excluded under Prop 193 if the parent was deceased AFTER Prop 19 (transfers on or after February 16, 2021): • Only the primary residence qualifies • Child must occupy the home as primary residence within one year • $1 million exclusion cap: excess above the cap is added to the child's assessed value • All non-primary property (rentals, vacation homes, investment parcels): fully reassessed Example with the $1 million cap at work: Parent's Prop 13 assessed value: $250,000 Full market value at transfer: $1,600,000 Gap between market value and assessed value: $1,350,000 Amount excluded by the $1M cap: $1,000,000 Taxable excess: $350,000 Child's new assessed value: $250,000 + $350,000 = $600,000 Result: the child pays taxes on $600,000, not $1,600,000 — still a major savings, but not a complete exclusion. Under the old Prop 58 rules, the same child would have kept the $250,000 assessed value intact. Example where the full exclusion still applies: Parent's assessed value: $250,000 | Market value: $1,100,000 Gap: $850,000 — under the $1 million threshold Result: full exclusion applies; child's assessed value stays at $250,000 The DRE exam tests whether candidates know the $1 million threshold and can apply the formula. It also tests the one-year occupancy requirement. Both are high-frequency exam questions.

While Prop 19 narrowed intergenerational transfers, it substantially expanded portability — the ability to carry a Prop 13 assessed value to a new home when you move. BEFORE Prop 19 (governed by Prop 60 and Prop 90): • Available only to homeowners age 55 or older • One-time lifetime transfer only • New home had to be of equal or lesser market value • Transfer limited to the same county (Prop 60) or a limited list of counties that had individually adopted Prop 90 — most counties did not participate AFTER Prop 19 (effective April 1, 2021): • Available to homeowners age 55 or older, severely and permanently disabled persons of any age, or victims of a wildfire or Governor-declared disaster of any age • Up to three lifetime transfers for age 55+ and disabled homeowners; unlimited for disaster victims • Transfer allowed to any county in California — no reciprocity requirement • New home can be of any value — if it costs more than the old home, the price difference is added to the carried-over assessed value Higher-value formula: New assessed value = old Prop 13 base + (new purchase price − old home sale price) Example: Old home Prop 13 assessed value: $180,000 Old home sale price: $750,000 New home purchase price: $900,000 Price difference: $150,000 New assessed value: $180,000 + $150,000 = $330,000 Without portability, this buyer is reassessed at $900,000 and pays roughly $9,000 per year. With portability, they pay taxes on $330,000 — approximately $3,300 per year. That is a $5,700 annual savings from portability alone. For agents working with 55+ clients who have lived in their homes for 20 or more years, portability is often the factor that makes an otherwise unthinkable downsizing or relocation financially viable. Many long-time California homeowners simply do not know this option exists — raising it early in a listing conversation can change the entire outcome.

Three Prop 13 and Prop 19 facts the DRE reliably tests: 1. Prop 13's three rules: 1% base rate; 2% annual adjustment cap (or California CPI, whichever is lower); reassessment only on change of ownership or new construction. All three rules are testable independently. 2. Prop 19 parent-child exclusion: primary residence only; child must occupy within one year; $1 million gap exclusion before reassessment applies to the excess; all non-primary property is now fully reassessed on transfer. 3. Prop 19 portability: available to age 55+, severely disabled, or disaster victims; any county in California; up to three lifetime transfers; higher-value replacement homes add the price difference to the carried Prop 13 base. For your clients, the practical counseling points: Buyers: help them calculate realistic post-purchase property tax costs before writing an offer. The purchase price sets the new Prop 13 base, and that number becomes a permanent recurring monthly expense — often $500–$1,000 per month on a median California home. Long-time sellers: explain portability before they rule out moving. Many 55+ owners who assume they cannot afford a move do not realize they can carry their low assessed value to any replacement home in California, up to three times. Families and estates: non-primary-residence property is now reassessed at full market value when inherited. Families doing intergenerational transfers should consult a CPA or estate attorney before any deed changes. Government rights including property taxation, eminent domain, and police power are covered in the DRE exam's Property Ownership section. For a full topic breakdown by exam category and percentage weight, see what's on the California real estate exam. Day One generates full-length practice exams calibrated to the DRE's exact Transfer of Property weighting, with Prop 13 and Prop 19 questions explained and cited to the relevant constitutional provisions — so these topics are familiar when they appear on test day.