Prop 19 in San Francisco: What It Means for Your Move and Your Heirs
Last updated: October 5, 2026
Prop 19 in San Francisco decides two things that matter to long-time owners. First, it decides whether you can keep a low property tax base when you move. Second, it decides how much tax your children pay if they inherit the house. In a city where many homes have been held for decades, both answers carry real money. This guide explains how each rule works, where the numbers land at San Francisco prices, and which questions to settle before you sell, buy or transfer.
What is Prop 19?
Proposition 19 is a 2020 amendment to the California Constitution that changed two property tax rules. It lets homeowners who are 55 or older, severely disabled, or victims of a wildfire or natural disaster carry their tax base to a new home anywhere in California. It also narrowed the tax break for homes passed from parents to children.
Voters approved the measure on November 3, 2020. The family transfer rules took effect on February 16, 2021. Meanwhile, the base year value transfer rules took effect on April 1, 2021. Both now sit in Article XIII A, Section 2.1 of the state constitution.
Why Prop 13 makes Prop 19 so valuable
Prop 19 only makes sense against the rule it modifies. Under Prop 13, the general property tax is capped at 1% of a home’s assessed value. In addition, that assessed value can rise by no more than 2% a year. The county resets it to market value when the home changes hands.
As a result, an owner who bought in 1995 may pay tax on a fraction of today’s value. In San Francisco, the combined rate for fiscal year 2025-26 was 1.18268325%, which includes voter-approved bonds. Our Nob Hill guide covers property tax from the buyer’s side. That gap between a decades-old tax base and current value is exactly what Prop 19 lets some owners keep, and what it takes away from others.
Moving after 55: how a Prop 19 base year transfer works
A base year value transfer lets an eligible owner sell a primary residence and carry its taxable value to a replacement primary residence. The replacement can be anywhere in California and at any price. If it costs more, the county adds part of the difference to the transferred value.
Who qualifies?
The owner must meet one of three tests on the date the original home sells:
- Age 55 or older.
- Severely and permanently disabled, as certified by a licensed physician. Age does not matter for this category.
- A victim of a wildfire or a governor-declared natural disaster, where the damage exceeds 50% of the home’s value.
Both homes must qualify for the homeowners’ or disabled veterans’ exemption. In other words, both must be principal residences. Rentals and second homes do not qualify.
The rules that decide whether it works
- Timing. You must buy or build the replacement within two years of selling, before or after the sale.
- Number of uses. Owners who qualify by age or disability can use the transfer three times in a lifetime. Disaster victims have no limit.
- Location. The new home can be in any California county, including within San Francisco.
- The claim. You file with the assessor where the new home sits, within three years of buying it. Escrow does not file it for you.
- The forms. The State Board of Equalization uses BOE-19-B for owners 55 and older, BOE-19-D with a disability certificate, and BOE-19-V for disaster victims.
What happens when the next home costs more?
Timing changes the math. The state treats a replacement as “equal or lesser value” if it costs no more than 100% of the old home’s value when bought before the sale. That threshold rises to 105% in the first year after the sale and 110% in the second year. The assessor adds any amount above the threshold to your transferred tax base.
Consider an illustration. You sell a San Francisco home for $5,000,000. Its taxable value is $900,000, so the general tax runs about $10,600 a year. You then buy a $6,000,000 home.
| When you buy the $6M home | Threshold | Amount added | New taxable value | Approx. annual tax |
|---|---|---|---|---|
| Before the sale | $5,000,000 | $1,000,000 | $1,900,000 | $22,500 |
| Within 1 year after | $5,250,000 | $750,000 | $1,650,000 | $19,500 |
| Within 2 years after | $5,500,000 | $500,000 | $1,400,000 | $16,600 |
| No transfer at all | n/a | n/a | $6,000,000 | $71,000 |
Illustrative figures at the FY 2025-26 San Francisco rate, before direct assessments and annual 2% adjustments.
The same purchase produces three different tax bases. Therefore, the order of your sale and your purchase is a financial decision, not just a logistical one.
Buying before you sell: the cost nobody mentions
Many sellers want the next home secured first. Prop 19 allows that. However, the State Board of Equalization is explicit about the cost. Until the original home sells, you pay tax on the new home’s full market value, and there is no refund for that period. On a $6,000,000 purchase, that runs roughly $5,900 a month at San Francisco’s current rate.
For downsizers, the picture is simpler, and the sale itself becomes the main event. Here is what it actually takes to sell above asking in San Francisco.
The arithmetic is short. If you sell a $5,000,000 house and buy a $3,500,000 condominium, you keep the $900,000 base. The tax stays near $10,600 instead of roughly $41,400.
Inheriting a San Francisco home under Prop 19
Under Prop 19, a child who inherits a parent’s home keeps part of the parent’s low tax base only if the child moves in. The child must make it a principal residence within one year and file for the homeowners’ exemption within one year. Even then, the protection is capped.
The two conditions
- The home was the parent’s principal residence.
- It becomes a child’s principal residence within one year, and that child files the exemption within one year.
Only one of the inheriting children needs to live there. Grandchildren qualify only if their parent, the grandparent’s child, has died. The claim forms are BOE-19-P for parent-child transfers and BOE-19-G for grandparent-grandchild transfers.
Why the $1,044,586 cap matters more in San Francisco
The constitution protects the parent’s taxable value plus $1 million, adjusted every two years for inflation. For transfers between February 16, 2025 and February 15, 2027, that figure is $1,044,586. The county adds any market value above that line to the child’s tax base.
At San Francisco prices, most of the value often sits above the line. Consider a home your parents bought decades ago:
| Amount | |
|---|---|
| Parent’s taxable value | $400,000 |
| Market value at transfer | $4,000,000 |
| Protected amount ($400,000 + $1,044,586) | $1,444,586 |
| Excess added to the base | $2,555,414 |
| Child’s new taxable value | $2,955,414 |
The annual tax moves from roughly $4,700 to roughly $35,000. Full reassessment would cost about $47,300. So the exclusion still saves about $12,400 a year, but it no longer preserves the parent’s bill.
Rentals, pied-à-terres and second homes
Before Prop 19, parents could pass rental property and second homes to children without reassessment, within limits. That exclusion is gone. Today, a child who inherits a home and rents it out pays tax on full market value. Likewise, a child who keeps the house as a weekend place pays the same.
How Prop 19 changes the sell-or-keep decision
Most families treat inheritance as an emotional question first. Under Prop 19, it is also a valuation question. The tax outcome depends on one number: the home’s market value on the date of transfer. Everything else follows from it.
That makes a few questions worth asking early:
- What is the home actually worth today, and how far does it sit above the protected amount?
- Will any heir truly live there within a year, or is the plan a rental?
- If the heirs sell, what does the house need before it reaches the market? Our notes on preparing a San Francisco home before you list cover the sequence.
- For an owner over 55, does buying first or selling first produce the better tax base?
Most of the time, these questions have clear answers. When they do not, the difference can reach tens of thousands of dollars a year, every year the home is held.
Is Prop 19 being repealed?
No repeal of Prop 19 is on the November 3, 2026 California ballot. A 2025 initiative to reverse the family transfer changes entered circulation but does not appear on the Secretary of State’s list of qualified measures. Earlier legislative attempts, ACA 9 in 2021 and SCA 4 in 2023, died in the Legislature.
The next scheduled change is mechanical. The Board of Equalization will adjust the $1,044,586 figure for transfers on or after February 16, 2027.
Frequently asked questions about Prop 19
Can I use Prop 19 to move within San Francisco?
Yes. A replacement home can be anywhere in California, including another San Francisco home. Both homes must be your principal residence, and you must buy within two years of selling.
Do I lose the transfer if my new home costs more?
No. You keep the transfer, but the assessor adds the amount above the 100%, 105% or 110% threshold to your tax base. The threshold depends on when you buy.
Does Prop 19 apply to condominiums?
Yes. State law treats each unit in a multiunit building as its own dwelling. A condominium qualifies as long as it is your principal residence and eligible for the homeowners’ exemption.
What if I inherit my parents’ home and do not move in?
The county reassesses the home to full market value. That applies whether you rent it, leave it vacant or use it as a second home.
How long do I have to file a Prop 19 claim?
For a base year transfer, three years from buying the replacement home. For a parent-child transfer, three years from the date of death or transfer, or before a sale to a third party, whichever comes first. The exemption itself must be filed within one year to apply from the start.
Start with an accurate value
Every Prop 19 calculation starts from one figure, the market value of the home. If you are weighing a move after 55, or you have inherited a San Francisco home, I can prepare a current valuation of your San Francisco home and show how the timing of a sale changes the outcome. You can also reach me directly.
This article explains how Proposition 19 works. It is not tax or legal advice. Rules apply to individual facts, so confirm your situation with a CPA, an estate planning attorney or the San Francisco Assessor-Recorder before acting.
Jason Hoffman · DRE# 01865372 · Compass