Quick Answer: Should You Name Co-Trustees in California?

No, in most cases. Co-trustees create more problems than they solve. Under California Probate Code §15620, co-trustees must act unanimously on all decisions, creating bottlenecks, conflicts, and shared liability that often leads to lawsuits and family disputes.

Better alternatives:

• Name a single capable trustee with clear successor trustees
• Use a professional trustee or trust company
• Give advisory roles instead of co-trustee authority

What Is a Co-Trustee in California?

A co-trustee is one of two or more individuals appointed to manage a trust together. Under California law, unless the trust document states otherwise, all co-trustees must agree on every decision (California Probate Code §15620).

Example: If you name your two adult children as co-trustees of your living trust, both must agree before they can:

• Sell your house
• Make investment decisions
• Distribute money to beneficiaries
• Pay bills from the trust
• Hire professionals

Co-Trustees vs. Single Trustee: California Comparison Table

| Factor | Co-Trustees | Single Trustee |

| Decision Speed | Slow (requires unanimous agreement) | Fast (one person decides) |

| Liability | Both liable for each other\'s mistakes (Prob Code §16004) | Individual liability only |

| Cost | Higher (more coordination, potential legal disputes) | Lower (streamlined administration) |

| Conflict Risk | High (disagreements common) | Low (clear authority) |

| Documentation | Extensive (every decision documented) | Standard fiduciary records |

| Court Involvement | More likely (deadlock disputes) | Less likely |

| Family Harmony | Often damages relationships | Clearer, less friction |

| Flexibility | Limited (both must be available) | High (one person acts) |

On paper, naming co-trustees sounds like a great idea.

Two heads are better than one. Built-in accountability. Shared responsibility. Maybe even a little family harmony.

It feels fair.

It feels safe.

It feels like you\'re preventing problems.

But in reality, naming co-trustees is one of the most common ways California families create conflict, delay, and outright legal disaster inside a trust.

After handling hundreds of trust administration cases in Sacramento and throughout Northern California, I can tell you: if you want to design a system that guarantees friction, slows down decisions, and increases the risk of lawsuits, co-trustees are a very effective way to do it.

Let me walk you through why.

The Big Problem Nobody Sees Coming: Everything Requires Agreement

Here\'s the rule that quietly causes most of the trouble.

Under California Probate Code §15620, unless the trust says otherwise, co-trustees must act unanimously.

That means:

• Selling a house
• Making an investment
• Distributing money to beneficiaries
• Hiring attorneys or accountants
• Signing tax returns

All of it requires agreement. Every single decision.

Now think about real life.

You\'re asking two human beings—often family members with different personalities, priorities, and financial instincts—to agree on every meaningful decision.

That\'s not a system. That\'s a bottleneck.

And when they don\'t agree, the trust doesn\'t move.

What Happens When Sacramento Co-Trustees Disagree? Nothing… Or Something Worse

When co-trustees disagree, one of two things happens.

First option: Nothing happens.

The trust freezes. Decisions get delayed. Bills go unpaid. Assets sit idle. Opportunities are lost.

I\'ve seen Sacramento families lose real estate deals because co-trustees couldn\'t agree on pricing. I\'ve seen investment portfolios stagnate because siblings couldn\'t agree on strategy.

Second option: Someone acts anyway.

And now you have a different problem.

Because if one co-trustee takes action that the other believes is improper, that disagreement can escalate into a legal dispute.

At that point, the solution isn\'t a conversation.

It\'s a court petition in Sacramento County Superior Court.

California Probate Code §17200 specifically allows a co-trustee to petition the court to resolve disputes or stop another trustee\'s actions.

So instead of smooth administration, you get:

• Deadlock
• Delay
• Legal fees ($15,000+ easily)
• Family tension
• And in some cases, a full-blown lawsuit

It Gets Worse: You Can Be Liable for What the Other Trustee Does

Here\'s where things become dangerous.

Most people assume that if there are two trustees, responsibility is split 50/50.

That\'s not how California law sees it.

Under California Probate Code §16004, a co-trustee can be liable for another trustee\'s mistake if they:

• Participate in it
• Approve it
• Ignore it
• Fail to stop it

Let that sink in.

You can be held personally responsible for something you didn\'t even do.

If your co-trustee makes a bad investment and you did nothing to stop it, you may still be on the hook.

If you knew something was wrong and didn\'t act, that alone can create liability under California\'s trust law.

In fact, the rules are so broad that it\'s difficult to imagine a situation where a co-trustee escapes responsibility entirely.

So now you have:

• Shared decision-making
• Shared risk
• Shared liability

That\'s not a partnership. That\'s mutual exposure.

The Myth of "Division of Duties"

Some Sacramento estate planning attorneys try to solve the co-trustee problem by dividing responsibilities in the trust document.

"One handles investments. The other handles distributions."

Or: "One is the \'money person' and the other is the 'family person.'"

Sounds logical.

But it doesn\'t eliminate the problem.