Marriage and Estate Planning in California: Why “Our Assets” Doesn’t Mean What You Think

By Dustin MacFarlane, California State Bar Certified Specialist in Estate Planning, Trust & Probate Law

PRIMARY KEYWORDS: California community property estate planning, marriage estate planning Sacramento, separate property vs community property, transmutation California

Quick Answer: If I Am Married in California, Can I Leave All My Assets to Whoever I Want?

No. Under California Probate Code Sections 100 and 6101, you can only give away what you legally own. In California’s community property system (Family Code Section 760), that typically means your separate property plus your one-half share of community property. Your spouse automatically retains their one-half of community property regardless of what your will or trust says. Many Sacramento couples misunderstand ownership – believing “our house” or “our accounts” are theirs to control completely. If you misunderstand what you actually own under California Family Code, your estate plan will fail. Additionally, how assets are titled, transmutations (changing property character under Family Code Section 852), and reimbursement rights (Family Code Section 2640) can dramatically change outcomes in ways most couples never anticipate.

Better approach: Work with a California estate planning attorney to identify what is separate vs. community property, ensure asset titles match your intentions, and coordinate your estate plan with California’s complex community property laws.

California Property Ownership Categories at Death

Executive Summary

Marriage changes your California estate plan whether you realize it or not.

In California, the moment you say “I do,” the law under Family Code Section 760 starts quietly rewriting parts of your financial life.

This article explains how property ownership, fiduciary duties under Family Code Section 721, transmutations under Section 852, reimbursement rights under Section 2640, and cohabitation issues can dramatically impact what happens to your assets during life and at death.

The key takeaway is this: You cannot control your California estate plan unless you understand what you actually own under California Family Code.

And in California, ownership is often far more complicated than Sacramento couples think.

This matters for married couples, registered domestic partners under Family Code Section 297, and even long-term cohabitants in Sacramento, Rocklin, Roseville, Granite Bay, Loomis, and throughout Northern California.

If you have a home, retirement accounts, or children from a prior relationship, you need to pay attention to California’s unique community property laws.

Mistakes here are not small. They can completely change who inherits your assets and can create serious family conflict costing $50,000-$250,000+ in Sacramento probate litigation.

Marriage Changes Everything in California Estate Planning

Most Sacramento couples think estate planning is about documents.

Wills. Trusts. Beneficiary designations.

That is only half the story.

The real foundation is ownership under California Family Code.

And marriage changes ownership in ways that surprise people.

Under California Probate Code Sections 100 and 6101, you cannot give away something you do not own.

That sounds obvious.

It is not in practice.

The Six Categories of Property Ownership in California

When someone dies in California, assets fall into categories under Family Code and Probate Code:

• Your separate property (you control 100% at death)
• Your spouse’s separate property (spouse controls 100% at death)
• Community property (each spouse controls 50% at death)
• Quasi-community property (treated like community at death per Family Code Section 125)
• Mixed/commingled assets (requires complex tracing and apportionment)
• Joint tenancy property (passes automatically to survivor, bypasses estate plan)

If you do not know which category an asset falls into under California law, you cannot predict what happens at death.

Real World Example from Sacramento: Property Classification Dispute

I have seen Sacramento families argue over a house for years because no one knew whether it was community or separate property under California Family Code.

Everyone thought they knew based on who paid for what.

No one actually knew under California legal definitions.

The property background:

• Purchased during marriage for $400,000
• Husband claimed he paid down payment with separate property ($100,000 inheritance)
• No contemporaneous documentation of separate property contribution
• Mortgage paid with community income over 20 years
• Property worth $1.2 million at husband’s death

The dispute:

• Husband’s will left “his separate property” to children from first marriage
• Second wife claimed entire house was community property
• Children claimed house was mostly separate property

The result:

• 2.5 years of Sacramento probate litigation
• $85,000 in combined legal fees
• Forensic accounting costs: $25,000
• Court ultimately found house was 85% community property, 15% separate
• Second wife received $510,000 (her 50% of community portion)
• Children received $690,000 to split (husband’s 50% community + his separate portion)

That $800,000 difference in outcome hinged on California property classification laws that the family didn’t understand.

California Community Property Is the Hidden Engine

California is one of only 9 community property states (along with Arizona, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, Wisconsin).

Under California Family Code Section 760, most assets acquired during marriage belong equally to both spouses.

So even if something is titled in your name alone, that does not mean it is yours alone under California law.

Why This Matters at Death Under California Probate Code

At death under California Probate Code Sections 100 and 6101:

• You control 100% of your separate property
• You control 50% of community property
• Your spouse automatically retains the other 50% of community property

If you try to give away more than your share through your will or trust, your plan will fail under California law.

Example: You cannot leave “our house” (community property) to your children from a first marriage. You can only leave YOUR 50% share. Your current spouse keeps their 50% automatically.

The California Title Trap That Catches Everyone

Here is where things get dangerous under California law.

The name on title can override what you think is true about ownership.

California Case Example: Estate of Wall (2021) 68 Cal.App.5th 168

In that case, real property titled in one spouse’s name alone was treated as that spouse’s separate property under California’s title presumption, even though both spouses contributed to purchase and maintenance.

The result under California law:

• Surviving spouse received less than expected
• Different tax treatment (separate property gets only partial basis step-up)
• Major difference in inheritance outcome

California Title vs. Reality: The Dangerous Gap

Column A: What Sacramento Couples Believe

• “This is OUR house – we both paid for it”
• “This is OUR retirement account – we both earned it”
• “These are OUR savings – we share everything”

Column B: What California Law Sees

• Title is in one name → Presumed separate property (Family Code §770(a)(1))
• Account titled individually → May be separate or community depending on tracing
• Commingled accounts → Requires forensic accounting to separate

If those two columns do not match, problems show up at death under California Probate Code.

The California Tax Surprise Nobody Sees Coming

Community property has a major federal tax benefit under Internal Revenue Code Section 1014(b)(6).

When one spouse dies:

• Both halves of community property receive a new stepped-up tax basis to fair market value at death
• This can eliminate hundreds of thousands in capital gains tax

Separate property does not get that same full benefit:

• Only the deceased owner’s share gets stepped-up basis
• Surviving owner’s share retains old low basis

Real World Example from Loomis: $90,000 Tax Difference

A couple in Loomis bought a home in 1985 for $50,000.

It was worth $1,200,000 at husband’s death in 2025.

Scenario A: Community Property

• Original basis: $50,000
• New stepped-up basis for BOTH halves: $1,200,000
• If wife sells for $1,200,000: $0 capital gains tax

Scenario B: Separate Property (titled in husband’s name only)

• Original basis: $50,000
• New basis: $625,000 (wife’s $25,000 + husband’s $600,000 stepped-up)
• If wife sells for $1,200,000: Capital gain of $575,000
• Capital gains tax at 20% federal + 13.3% CA: ~$191,000

That is a $191,000 tax mistake from not understanding California community property law.

Transmutation: The Most Dangerous California Family Code Concept You’ve Never Heard

Transmutation under California Family Code Section 852 means changing property from separate to community, or vice versa.

Sounds simple under California law.

It is not.

Why Sacramento Couples Transmute Property

Couples often say:

• “We share everything anyway – let’s make it all community property”
• “We want to simplify our estate planning”
• “We want the tax benefits of community property”

So they transmute everything into community property.

Sometimes for tax planning reasons.

Sometimes for emotional reasons (“we’re a team”).

Why Transmutation Can Backfire Under California Law

Under California Family Code Section 852, you cannot change property character “just for estate planning purposes.”

Once you transmute property under California law, it is transmuted for EVERYTHING:

• Estate planning outcomes
• Divorce property division
• Creditor rights
• Tax treatment

I have seen Sacramento people lose assets they brought into the marriage because of a poorly thought-out transmutation.

California Transmutation Risk Flow

Step 1: Convert separate property to community property (via transmutation under Fam C §852)

Step 2: Marriage ends in divorce OR spouse dies

Step 3: Asset is now community property for ALL purposes

Divorce scenario: Spouse who contributed nothing to original asset now owns 50%

Death scenario: Asset may pass differently than originally intended

One transmutation decision. Permanent consequences under California law.

The California Reimbursement Trap

California Family Code Section 2640 allows reimbursement for certain separate property contributions.

But here is the critical catch under California law:

Section 2640 reimbursement rights only apply in DIVORCE proceedings, not at death.

Real World Example from Granite Bay: Lost $200,000 Reimbursement

A Granite Bay spouse contributed $200,000 of separate property funds (from inheritance) to purchase a $800,000 family home.

Divorce scenario:

• Under Family Code Section 2640, spouse gets reimbursed $200,000
• Remaining $600,000 equity split 50/50
• Contributing spouse receives $500,000 total

Death scenario:

• Section 2640 does NOT apply at death
• Entire home is community property (50/50)
• Surviving spouse receives $400,000
• Contributing spouse’s estate receives $400,000
• $100,000 “lost” compared to divorce scenario

Result: The contributing spouse’s children could end up with a completely different outcome ($400,000 instead of $500,000) simply because of death vs. divorce timing.

This $100,000 difference surprised the family and created conflict.

Fiduciary Duties Between California Spouses

Marriage under California law is not just emotional.

It is a legal fiduciary relationship.

Under California Family Code Section 721(b), spouses owe each other:

• Duty of highest good faith and fair dealing
• Duty of disclosure of all material facts
• Duty to account for community property transactions

This is the same fiduciary standard imposed on trustees and business partners under California law.

What Fiduciary Duty Means in Real Life

Under California Family Code Section 721:

• You cannot hide assets from your spouse
• You cannot take unfair advantage in property transactions
• You must fully disclose financial information
• You cannot secretly gift community property without consent

If you violate these California fiduciary duties, courts can:

• Undo transactions
• Award the disadvantaged spouse greater share of property
• Impose penalties

California Case Example: Marriage of Delaney (2003) 111 Cal.App.4th 991

This case reinforced that California spouses must act fairly in all transactions involving community property.

A husband secretly transferred community property assets to his business entity.

The California court found breach of fiduciary duty and awarded the wife a greater share of the community estate as remedy.

The lesson: Secret property transfers by one spouse violate California Family Code Section 721.

Waiving California Spousal Rights Can Create Disaster

Spouses can waive certain rights under California Probate Code Section 141.

These waivers can include:

• Inheritance rights from spouse’s estate
• Rights to community property
• Homestead rights
• Family allowance during estate administration
• Rights to serve as executor or administrator

Why California Spousal Waivers Are Dangerous

Waivers sound clean and simple on paper.

In reality under California law, they can create harsh outcomes.

Real World Example from Roseville: Waiver Disaster

A Roseville couple signed a premarital agreement waiving all spousal inheritance rights under California Probate Code Section 141.

They intended to each leave their estates to children from prior marriages.

But they never actually finished creating their estate plans (no wills or trusts).

When husband died intestate (no will):

• California intestate succession under Probate Code Section 6401 would normally give spouse significant share
• BUT the waiver under Section 141 removed spouse’s intestate succession rights
• Assets went entirely to husband’s adult children instead
• Surviving spouse (married 18 years) received NOTHING
• Financial hardship followed

Result under California law:

• Spouse had waived rights thinking husband would create will leaving her some assets
• He never did
• Waiver was valid and enforceable
• Surviving spouse had no legal remedy

I have seen this happen in Sacramento probate court. It is not theoretical.

California Blended Families: Where Everything Collides

Second marriages under California law are where community property and estate planning goals often conflict.

Sacramento blended family competing goals:

Goal 1: Protect current spouse financially during their lifetime

Goal 2: Preserve assets for children from first marriage

These goals directly conflict under California community property law.

Why California Agreements Help But Don’t Solve Everything

Even with premarital agreements under California Family Code Section 1612:

• Property acquired during second marriage becomes community property unless agreement specifies otherwise
• Estate plans must coordinate with property ownership definitions
• Asset titles must align with both agreement and estate plan
• Beneficiary designations must match overall plan

If any element is misaligned, conflict is almost guaranteed in Sacramento probate court.

California Cohabitation and Marvin Agreements

Not everyone in Sacramento gets married.

Some couples live together for years or decades without marrying.

What California Law Says About Cohabitants

Under California case law (Marvin v. Marvin (1976) 18 Cal.3d 660), cohabitants CAN create enforceable contracts defining financial rights.

These “Marvin agreements” or cohabitation agreements can specify:

• Property ownership during relationship
• Rights if relationship ends
• Support obligations
• Estate planning intentions

But unlike marriage under California Family Code, these rights are NOT automatic.

They must be proven through:

• Written agreement (strongly recommended)
• Oral agreement (much harder to prove)
• Implied contract from conduct (difficult to establish)

Why California Cohabitation Issues Matter for Estate Planning

If there is no valid Marvin agreement under California law:

• No automatic inheritance rights (unlike spouses under Probate Code Section 6401)
• No community property rules (unlike spouses under Family Code Section 760)
• No spousal protections (no family allowance, homestead rights, etc.)
• No right to administer estate (unlike spouses who have priority under Probate Code Section 8461)

That can lead to harsh outcomes when one partner dies.

Example: Sacramento couple lives together 25 years. One partner dies without will. Surviving partner receives NOTHING – everything goes to deceased partner’s distant relatives under intestate succession laws.

The California Conflict of Interest Problem

Here is something most Sacramento couples do not realize.

One attorney representing both spouses in estate planning can create conflicts of interest.

California Rules of Professional Conduct Rule 1.7 governs conflicts of interest.

Why This Matters for Sacramento Couples

When one attorney represents both spouses:

• If interests diverge later, the agreement or estate plan may be challenged
• The attorney may have to withdraw from representing either spouse
• The attorney may end up as a witness in litigation between the spouses
• Confidentiality issues arise

Best practice: Each spouse should have independent legal counsel when:

• Creating premarital agreements
• Transmuting property character
• Waiving significant rights
• Dealing with blended family issues

California Estate Planning Without Family Law Coordination Is Incomplete

Estate planning and California family law are deeply interconnected.

Ignoring one creates problems in the other.

Real World Example from Sacramento: Tax Planning Backfire

A Sacramento couple focused obsessively on federal estate tax savings.

They transmuted significant separate property to community property under California Family Code Section 852 to maximize basis step-up at death.

Their estate planning attorney recommended it for tax reasons.

Years later, they divorced.

Because the separate property had been transmuted to community property:

• One spouse lost $400,000 of separate property assets in the divorce
• The tax savings strategy worked perfectly for estate planning
• But it created disaster in the divorce context

The plan worked perfectly for one purpose. It failed catastrophically for another.

This is why California estate planning and family law MUST be coordinated.

Why California Marriage and Estate Planning Is So Complex

Because life is complex for Sacramento families.

People:

• Remarry after divorce or death of spouse
• Mix separate and community property
• Support children from multiple relationships
• Change financial plans over time
• Move to/from California (affecting community property characterization)

California law tries to keep up with these complexities through Family Code and Probate Code.

But it requires careful, coordinated planning by experienced California attorneys.

What Sacramento Couples Should Do Now

If you are married or living together in California:

1. Identify what you actually own under California Family Code (separate vs. community)

2. Confirm how assets are titled (matches intentions or creates problems?)

3. Review any agreements (premarital, transmutation, cohabitation)

4. Align estate plan with ownership (trust/will coordinates with Family Code)

5. Update beneficiary designations (life insurance, retirement accounts match plan)

6. Consider tax implications (basis step-up, capital gains, property tax)

Do not assume everything works together under California law. It often does not.

The cost of reviewing and coordinating: $2,000-$8,000 for comprehensive planning.

The cost of NOT coordinating: $50,000-$500,000+ in litigation and taxes.

Frequently Asked Questions: California Marriage and Estate Planning

Q: What is community property in California?

A: Under California Family Code Section 760, community property includes most assets acquired during marriage with income earned during marriage. Each spouse owns an equal one-half share, regardless of whose name is on title.

Q: What is separate property in California?

A: Under California Family Code Section 770, separate property includes assets owned before marriage, gifts or inheritances received during marriage (if kept separate), and assets acquired after permanent separation. The owner controls 100% of their separate property.

Q: Can I leave my entire California estate to my children if I am married?

A: No. Under California Probate Code Sections 100 and 6101, you can only leave your separate property plus your one-half share of community property. Your spouse automatically retains their one-half of community property regardless of your will or trust.

Q: What is transmutation under California Family Code?

A: Transmutation under California Family Code Section 852 is changing property from separate to community (or vice versa). It requires a written agreement signed by the spouse whose interest is adversely affected and must expressly state that the character of the property is being changed.

Q: Can transmutation affect California divorce outcomes?

A: Yes. Once property character is changed under Family Code Section 852, it applies for ALL purposes – divorce property division, estate planning, creditor rights, and taxes. A transmutation done for estate tax planning will also affect divorce outcomes.

Q: What is a California reimbursement right under Family Code Section 2640?

A: Family Code Section 2640 provides that when separate property is used to acquire or improve community property, the contributing spouse has a right of reimbursement upon divorce. However, this right does NOT apply at death – only in divorce proceedings.

Q: What happens if California property title is wrong or unclear?

A: The law may treat the asset differently than you expect under California presumptions. This can change inheritance outcomes, tax treatment (basis step-up), and create costly Sacramento probate litigation to determine actual ownership.

Q: Can California spouses waive inheritance rights?

A: Yes, under California Probate Code Section 141, spouses can waive inheritance rights, community property rights, family allowance, and other protections. But the waiver must be informed, in writing, and made after full disclosure. Waivers can create harsh outcomes if estate plans are never completed.

Q: What is a fiduciary duty between California spouses?

A: Under California Family Code Section 721(b), spouses must act with highest good faith and fair disclosure in financial matters affecting community property. This is the same fiduciary standard imposed on trustees. Violations can result in unequal property division and penalties.

Q: Do California cohabiting couples have the same rights as married couples?

A: No. Without a valid Marvin agreement or other contract, California cohabitants have no automatic inheritance rights, community property protections, or spousal benefits under Family Code or Probate Code. Rights must be established through written agreements.

Q: Should I update my California estate plan after marriage?

A: Yes, immediately. Marriage under California Family Code Section 760 creates community property, changes ownership of assets, and may revoke prior estate planning documents. Your entire plan must be reviewed and coordinated with California’s community property system.

Q: Can one attorney represent both spouses in California estate planning?

A: Technically yes, but it creates potential conflicts under California Rules of Professional Conduct Rule 1.7. When interests diverge (blended families, significant wealth disparity, etc.), independent counsel for each spouse is strongly recommended to avoid future challenges.

Final Thought: California Marriage Changes Everything About Estate Planning

Estate planning during California marriage is not simple.

It is not intuitive.

And it is definitely not something you want to guess at under California Family Code and Probate Code.

I have seen Sacramento families:

• Lose $100,000-$500,000+ of assets through property classification mistakes
• Fight in probate court for years over community vs. separate property disputes
• Pay $50,000-$250,000 in litigation fees
• Destroy family relationships permanently

All from misunderstanding California community property law and how it affects estate planning.

If there is one takeaway from 17 years of California estate planning practice, it is this:

Before you decide who gets your assets at death, make sure you know what you actually own under California law.

Because in California’s community property system, that answer is rarely as simple as Sacramento couples think.

About the Author

Dustin MacFarlane is a California State Bar Certified Specialist in Estate Planning, Trust & Probate Law (State Bar #262162) and founder of California Probate and Trust, PC. He has been helping Sacramento and Northern California couples navigate the complex intersection of marriage and estate planning since 2009, with particular focus on community property issues, second marriages, and blended families in Sacramento, Granite Bay, Roseville, and Rocklin.

California State Bar certification as a Certified Specialist requires passing a rigorous examination, substantial specialized experience, continuing education, and peer review recognition. Fewer than 10% of California attorneys hold this credential.

Dustin does not handle divorce or family law litigation-his practice focuses exclusively on estate planning and trust administration, helping married couples coordinate their estate plans with California’s unique community property laws.

California Probate and Trust, PC

6957 Douglas Blvd., Granite Bay, CA 95746

Phone: (866) 400-0058

Email: dustin@cpt.law

This article reflects California Family Code, Probate Code, and estate planning law as of March 2026. It is provided for general information only and does not constitute legal advice. Every situation is unique; consult with a qualified California estate planning attorney about your specific circumstances.

About the Author: Dustin MacFarlane, Esq.

California Licensed Attorney | Estate Planning Specialist

Dustin MacFarlane is the founder of California Probate and Trust, PC, with over 15 years of experience in estate planning, probate administration, and trust law. Licensed by the California State Bar, Dustin has helped thousands of California families protect their assets and plan for the future.

CA Bar License: Active | Practice Areas: Estate Planning, Probate, Trust Administration | Location: Granite Bay, CA