A power of attorney is one of the most important documents in your estate plan. But most people don't discover its weaknesses until it's too late.

I've watched families struggle because someone made one of these five mistakes. Here's what you need to know.

Mistake #1: Using an Old or Outdated Form

California law changed dramatically in 2015 when the new Probate Code sections 4000-4545 took effect.

Powers of attorney signed before January 1, 2015 may still be valid, but they often lack critical provisions that make modern documents more effective.

More importantly, many financial institutions are increasingly reluctant to accept older forms—even if they're technically valid under California law.

Mistake #2: Assuming Your Spouse Can Handle Everything

This is the most common and most costly assumption people make.

Being married does not automatically give your spouse authority to access your individual accounts, manage your separate property, or make financial decisions on your behalf if you become incapacitated.

Without a proper power of attorney, your spouse may need to go to court and establish a conservatorship just to pay your bills or access your accounts.

Mistake #3: Not Providing the Document to Financial Institutions in Advance

Here's a scenario I see repeatedly: Someone signs a power of attorney, puts it in a drawer, and assumes it will work when needed.

Then a crisis happens. The family rushes to the bank with the document, and the bank refuses to honor it.

Why? Many banks have their own internal policies. They may:

• Require their own proprietary form
• Refuse documents older than a certain number of years
• Demand an affidavit or certification from the agent
• Require review by their legal department (which can take weeks)

The solution: Provide a copy of your power of attorney to your financial institutions NOW, while you're still capable. Let them review it, approve it, and add it to your account file. This prevents delays during an emergency.

Mistake #4: Choosing the Wrong Agent

Your agent under a power of attorney has tremendous authority. They can:

• Access your bank accounts
• Sell your property
• Make gifts
• Change beneficiary designations
• Manage investments
• Handle tax matters

Choosing someone who is dishonest, financially irresponsible, or easily influenced can be devastating.

But choosing someone who lives far away, has health problems of their own, or lacks the time or ability to manage your affairs can be almost as bad.

Think carefully. Choose someone trustworthy, responsible, and capable. And always name backups in case your first choice is unable to serve.

Mistake #5: Using a "Springing" Power of Attorney

A "springing" power of attorney only becomes effective when you become incapacitated.

That sounds good in theory. But in practice, it creates problems:

• Who decides when you're incapacitated?
• What proof do financial institutions require?
• What if you're incapacitated but refuse to admit it?
• What if your doctors disagree about your capacity?

Many financial institutions refuse to accept springing powers of attorney because they don't want to be in the position of determining whether the "spring" has been triggered.

A better approach: Use a power of attorney that's effective immediately, but include strong safeguards and controls to prevent misuse. For example, you can require your agent to provide annual accountings to a designated person, or require two agents to act together for certain transactions.

Why This Matters

A power of attorney is designed to help your family avoid court during a crisis.

But if it's outdated, poorly drafted, or hasn't been accepted by your financial institutions, it won't work when you need it.

And that means your family may face the time, expense, and public nature of a conservatorship proceeding—exactly what you were trying to avoid.