What Does Prop 42 Do, and Would It Change Taxes on Your Home?

by Zach Arrington

Updated October 2026

Proposition 42 would amend the California Constitution so the state could not create new taxes on owning personal property, such as investments and retirement accounts, and would limit new state taxes that reach back to past events. A YES vote means the state could not establish those new taxes; a NO vote means the state keeps the option to establish them. For a North County homeowner, the most important point is this: the measure text says its ban on new ownership taxes does not alter or affect the taxation of real property, so the Prop. 13 property tax on your home would not change.

I'm Zach Arrington, Broker Associate with Real. I work with buyers and sellers in coastal North County, from Carmel Valley and Del Mar to Solana Beach, Encinitas, Cardiff by the Sea and Rancho Santa Fe. Here is what Prop 42 says. I am not telling anyone how to vote.

What Prop 42 would do

Prop 42 would ban new state taxes on owning personal property and restrict retroactive taxes. The Legislative Analyst's Office (LAO) explains that personal property means everything people own other than real estate. Today, the state taxes the income from stocks and investment accounts but not simply owning them. The state and local governments already tax owning some personal property, such as the vehicle license fee and the county property tax on business equipment.

The measure would add a new Article VIII to the state Constitution:

Provision	What the measure text says
Ban on new ownership taxes	No state law or constitutional provision enacted on or after January 1, 2026 may tax the ownership or control of retirement holdings, individually owned assets or other personal savings, held directly or indirectly.
What counts	Pensions, 401(k), 403(b) and other retirement accounts, mutual funds, and all personal property, including financial assets, business interests, digital assets, intellectual property and personal belongings.
Existing taxes	Any tax in effect, imposed and first collected on or before December 31, 2025 is not altered.
Real property	Nothing in the ownership tax ban alters or affects the taxation of real property under other parts of the Constitution.
Retroactive taxes	New state taxes cannot create liability based on conduct, activities or a status (including residency) that existed before the tax took effect.
Emergency exception	A tax passed by the Legislature may reach back up to 365 days if the Governor declares an emergency caused by a fire, flood, storm, civil disorder, earthquake, volcanic eruption or enemy attack, or declares a fiscal emergency, and the statute limits the revenue to responding to that emergency.
Same ballot measures	Applies to all statewide initiatives submitted to voters on or after January 1, 2026, including those on the same ballot; a conflicting measure on the same ballot would be null and void if Prop 42 gets more yes votes.

What a YES vote and a NO vote mean

A YES vote means the state could not establish new taxes on the ownership of financial assets or other personal property. A NO vote means the state would continue to have the option to establish those new taxes.

What it would mean for North County homeowners, buyers and sellers

For a typical owner in Carmel Valley, Del Mar, Rancho Santa Fe, Solana Beach, Encinitas or Cardiff by the Sea, Prop 42 would not change any line on the secured property tax bill. My method: I compared each component of a San Diego County secured tax bill, as the County Treasurer Tax Collector and Auditor and Controller describe it, against what the measure text covers.

The County says your secured bill reflects three things: the 1% tax on net taxable value, charges for voter approved bonds (for example school districts and special districts), and fixed charge special assessments, including Mello Roos. The County notes that Prop. 13 of 1978 caps the general tax at 1% of full cash value, assessed value can rise up to 2% a year, and a homeowner can claim a $7,000 exemption on a primary residence.

Every one of those pieces is a tax or charge on real property, not on personal property, and the measure states that it does not alter the taxation of real property. Take a hypothetical home with a $1,500,000 assessed value and the $7,000 homeowners' exemption: the 1% general levy would be $14,930 a year, plus local bonds and assessments. That amount would be calculated the same way whether Prop 42 passes or fails.

Where Prop 42 could matter is what you own besides the house: brokerage accounts, IRAs, 401(k)s, pensions and business interests. It would block future state taxes on simply holding those assets, while existing taxes first collected by the end of 2025 continue.

Where it does and doesn't apply

Prop 42 covers new state taxes on owning personal property and new retroactive state taxes; it does not cover the property tax on your house, land or condo.

Covered: new state laws or constitutional provisions enacted on or after January 1, 2026 that would tax owning personal property, or impose tax based on past conduct or past residency.
Not covered: the taxation of real property, which the ownership tax ban expressly leaves alone, and any tax already in effect and first collected by December 31, 2025, such as today's vehicle license fee and income tax.
Not mentioned: the words "home," "home equity" and "net worth" do not appear in the measure's operative text, which speaks to personal property and says the ownership tax ban does not affect real property taxation.

Bottom line for a typical North County homeowner: your county property tax bill would see no change from Prop 42. What could change is whether the state could someday tax simply owning personal assets.

How Prop 42 relates to Prop 40

Prop 40, on the same ballot, would impose a one time state tax on billionaires equal to 5% of their net worth. The LAO says that if Prop 42 receives more yes votes than Prop 40, Prop 40 could be stopped from becoming law even with majority support, because courts could find the two conflict. The LAO says Prop 40 generally would exclude real estate, pensions and retirement accounts.

Fiscal effects

The LAO says Prop 42 restricts the state's future options for raising taxes, which could reduce future tax revenues, and that when and by how much is unclear. Its fiscal summary is: possibility that tax revenues will not go up as much in the future.

What supporters say

Supporters argue that the state Constitution currently allows the Legislature to tax the value of personal property, so money could be taxed once when earned and again while it sits in savings. They say Prop 42 would protect 401(k)s, pensions, IRAs and personal savings from new taxes this year and in the future, and would require any new taxes to apply only after voters have approved them. Their rebuttal says the measure is backed by seniors, veterans, firefighters and workers.

What opponents say

In their argument and rebuttal, opponents say Prop 42 is not really about protecting retirement savings and was designed to undo the billionaire tax in Prop 40. They say Prop 40 applies only to billionaires and that its revenue would help keep hospitals open and health care affordable. Their argument says billionaire donors are funding Prop 42.

What this means if you own, buy or sell a home

If you own a home, Prop 42 would not change your assessed value, your 1% levy, your local bonds or your Mello Roos charges. If you are buying, your bill will still be set by the County's reassessment when ownership changes, plus local charges. If you are selling, existing state income tax on a gain would not change, and a future state tax generally could not reach back to a sale or residency status that came before it took effect. If voters approve it on November 3, 2026, the measure says it takes effect at the earliest date allowed under Article II, Section 10 of the state Constitution, which is tied to when the Secretary of State files the official statement of the vote. Results will be certified after Election Day, and I will update this post once they are final.

Frequently asked questions

Does Prop 42 affect property taxes on my home?

No. The measure text says nothing in its ban on new ownership taxes alters or affects the taxation of real property under other parts of the Constitution. Your Prop. 13 based county tax bill, local bonds and special assessments are real property charges and stay as they are.

Does Prop 42 ban a tax on home equity?

The measure does not use the words "home" or "home equity" in its operative text. It bans new state taxes on owning personal property, which the LAO defines as everything people own other than real estate.

What does a yes vote on Prop 42 mean?

A yes vote means the state could not establish new taxes on owning financial assets or other personal property, and new state taxes generally could not apply retroactively. Taxes already in effect and first collected by December 31, 2025 would continue.

What does a no vote on Prop 42 mean?

A no vote means the state would keep the option to establish new taxes on owning financial assets or other personal property. Current taxes would be unchanged either way.

Would Prop 42 cancel the Prop 40 billionaire tax?

It could. The LAO says that if Prop 42 gets more yes votes than Prop 40, Prop 40 could be stopped from becoming law even with majority support, because courts could find the two measures conflict. The measure text says a conflicting measure on the same ballot would be null and void in that case.

Does Prop 42 protect 401(k)s and IRAs from taxes?

It would bar new state taxes on simply owning or controlling retirement accounts, including 401(k), 403(b) and other individual retirement accounts. It would not stop existing state income tax on withdrawals or earnings, because taxes in place by the end of 2025 are carved out.

Does Prop 42 apply to local taxes?

The measure's limits are written for state laws and provisions of the state Constitution, and the official title describes it as a limit on state taxes. The measure text does not mention city, county or school district taxes.

When would Prop 42 take effect?

If voters approve it on November 3, 2026, it takes effect at the earliest possible date under Article II, Section 10 of the state Constitution, after the Secretary of State files the statement of the vote. Its rules apply to taxes enacted or taking effect on or after January 1, 2026.

This is one of five explainers on the November 2026 propositions that affect California homeowners: What Is Prop 1, the 2026 Housing Bond, and What Would It Mean for North County?, What Is Prop 37, and Could It Help You Buy a New Home in North County?, What Is Prop 43, and What Would It Change for North County Homeowners? and What Would Prop 45 Change About New Housing Near You in North County?

Questions about how a ballot measure could affect buying or selling your home? Call or text Zach Arrington at (619) 374-5339 or email zach@zarealtygroup.com.

This article is general information and does not recommend how to vote. It is not legal, tax or financial advice. Read the official voter guide and the full measure text before you vote.

Zach Arrington, DRE 02135675, Real Broker, LLC