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7 Common Mistakes Trustees Make—And How a Professional Fiduciary Helps You Avoid Them

07/13/2025 | Tom LaVoie |

Serving as a trustee looks simple—until the calendar reminders, tax notices, and sibling texts start flying. Here are the pitfalls we see most often in California trusts, along with the ways a licensed professional can help prevent them from becoming lawsuits or family feuds.

1. Commingling Personal and Trust Funds

The mistake: Using one checking account for both household and trust expenses “until things settle.”
Why it hurts: Courts can surcharge you for every dollar that can’t be traced, and creditors may pierce trust protection.
The pro fix: A fiduciary opens dedicated, titled accounts on day one and sets up automated bill pay so that every transaction is clean, documented, and ready for annual accounting.

2. Missing the Mandatory Accounting Deadline

The mistake: Skipping or delaying the first trust accounting (due one year after acceptance) because “the beneficiaries know I’m busy.”
Why it hurts: Probate Code §16061.7 gives beneficiaries the right to petition the court—or remove you—for silence.
The pro fix: Professionals close the books monthly, use fiduciary-specific software, and calendar statutory due dates 60 days in advance.

3. Holding a Concentrated, High-Risk Portfolio

The mistake: Leaving Dad’s entire nest egg in one tech stock or a vacant lot “because he loved it.”
Why it hurts: Trustees are required to follow the Uniform Prudent Investor Act. Failure to diversify can result in personal liability if the asset declines in value.
The pro fix: Fiduciaries draft a written Investment Policy Statement, hire a credentialed advisor, and document diversification decisions.

4. Treating Beneficiaries Unequally

The mistake: Advancing cash or rent-free use of a house to one sibling without giving the same economic value to others.
Why it hurts: The court views it as an unauthorized distribution and can force reimbursement, plus attorney fees.
The pro fix: Neutral trustees run equalization schedules for any “early” benefits and obtain written consents before special favors.

5. Ignoring Tax Triggers

The mistake: Selling inherited real estate too slowly and blowing the property-tax exclusion window, or failing to file the IRS Form 706 for portability of a deceased spouse’s exemption.
Why it hurts: Tens of thousands lost in property tax or estate tax savings.
The pro fix: Professionals work off a 90-day tax checklist, coordinate with CPAs, and file Prop 19, 706, and 8971 forms on deadline.

6. Overpaying—or Underpaying—Themselves

The mistake: Taking random “thank-you” checks or, conversely, refusing any fee and running out of steam halfway through administration.
Why it hurts: Excess fees spark litigation; zero fees erode motivation and invite sloppy work.
The pro fix: Fiduciaries publish a court-approved hourly or percentage rate up front, log time, and include a detailed invoice in each accounting.

7. Delaying Final Distribution

The mistake: Keeping the trust open for years “just in case” while beneficiaries grow angrier (and legal interest mounts).
Why it hurts: Trustees owe a duty of reasonable diligence; delay can be deemed a breach.
The pro fix: A professional sets a closing timeline, resolves creditor claims quickly, obtains IRS clearance letters, and distributes assets—often within 12-18 months for a standard estate.

The Bottom Line

Good intentions don’t override fiduciary law. If you’re unsure about even one of these duties, consider partnering with a licensed professional fiduciary—either as co-trustee today or as your named successor for tomorrow.

Quick Action Checklist for Lay Trustees

  1. Open separate trust bank & brokerage accounts within 10 days.
  2. Inventory & appraise all assets within 90 days.
  3. Send the required notice to beneficiaries (Probate Code §16061.7) within 60 days.
  4. Hire a tax professional to map property-tax and estate-tax deadlines.
  5. Create a distribution roadmap with target dates and equalization strategy.

Need a neutral expert to stand between you and potential liability?

Pride Trust Services acts as sole or co-trustee, prepares bulletproof accounting, and keeps family relationships intact. Book a complimentary 15-minute call to see how we can lighten your load—legally and emotionally.

For educational purposes only, this is not legal or tax advice. Consult qualified counsel regarding your specific situation.