The 7 Most Costly Executor Mistakes in California Probate — and How to Avoid Them

Serving as executor of an estate in California is a serious legal responsibility. Unlike a simple task that can be redone if something goes wrong, executor mistakes can result in personal liability, court sanctions, beneficiary lawsuits, and financial losses that come directly out of your own pocket — not the estate's. In San Francisco and Marin County, where estate values are high and beneficiary expectations are often elevated, the stakes are particularly significant.

This guide identifies the seven most costly mistakes executors make in California probate and explains precisely how to avoid each one.

Mistake 1: Acting Before Court Appointment

The most fundamental mistake an executor can make is taking action on behalf of the estate before being formally appointed by the court. Being named as executor in a will does not give you legal authority to act. You must wait for the court to issue Letters Testamentary — the official document that authorizes you to manage estate assets, access financial accounts, and make decisions on behalf of the estate.

Executors who act prematurely — accessing bank accounts, selling assets, or making payments — can be held personally liable for any losses that result, and may face removal by the court. The correct approach is to secure estate assets (change locks, maintain insurance, collect mail) while the petition is pending, but to take no financial action until Letters are in hand.

Mistake 2: Missing the Four-Month Inventory Deadline

California Probate Code §8800 requires the executor to file a complete inventory and appraisal of all estate assets within four months of appointment. This is not a soft deadline — missing it can result in court sanctions, removal as executor, and personal liability for any losses attributable to the delay.

The inventory must include all assets owned by the decedent at the time of death, including real property, bank accounts, investment accounts, personal property, and any business interests. A court-appointed probate referee must appraise non-cash assets. Starting the inventory process immediately upon appointment — before the four-month clock becomes a concern — is the only reliable way to meet this deadline.

Mistake 3: Distributing Assets Before Paying Creditors

One of the most serious breaches of fiduciary duty an executor can commit is distributing assets to beneficiaries before all valid creditor claims, taxes, and administrative expenses have been paid. California law is explicit: creditors have priority over beneficiaries. If you distribute assets prematurely and there are insufficient funds remaining to pay creditors, you can be held personally liable for the shortfall.

The creditor notice period — four months from appointment, or 60 days from mailing notice, whichever is later — must expire before distribution. Even after the notice period expires, you must review all filed claims, accept or reject them, and resolve any disputes before distributing to beneficiaries.

Mistake 4: Commingling Estate and Personal Funds

Every executor must open a separate estate bank account and keep all estate funds strictly separate from their personal finances. Commingling — depositing estate funds into your personal account, even temporarily — is a serious breach of fiduciary duty that can result in removal as executor and personal liability.

The estate account should be opened immediately after receiving Letters Testamentary. All estate income, proceeds from asset sales, and distributions should flow through this account. All estate expenses should be paid from this account, with receipts retained for the final accounting.

Mistake 5: Selling Estate Property Without Proper Authority or Below 90% of Appraisal

Real property sales are among the most legally complex aspects of California probate. Executors who sell estate property without proper authority — either IAEA authority or court confirmation — or who accept a price below 90% of the probate referee's appraised value, expose themselves to significant personal liability.

Before listing any estate property, confirm whether you have full IAEA authority. If you do, you can sell without court confirmation but must still give proper notice to interested parties and obtain fair market value. If you do not have IAEA authority, the sale must go through the court confirmation process, including the 90% floor and the overbidding procedure.

Working with a Certified Probate & Trust Specialist who understands these requirements is not optional — it is a fiduciary obligation.

Mistake 6: Failing to File Required Tax Returns

The executor is responsible for filing the decedent's final individual income tax return, an estate income tax return for any income earned during administration, and — if applicable — a federal estate tax return. Missing these deadlines results in penalties and interest that reduce the estate's value and can expose the executor to personal liability.

The federal estate tax return is due nine months from the date of death, with a six-month extension available. The decedent's final individual income tax return is due on the normal April 15 deadline for the year of death. Estate income tax returns are due on April 15 of the year following the tax year in question. Engaging a CPA with probate experience early in the administration process is strongly recommended.

Mistake 7: Failing to Communicate with Beneficiaries

Lack of communication is one of the most common triggers for beneficiary disputes, court petitions for accounting, and litigation against executors. Beneficiaries have a legal right to information about the estate's administration, and an executor who fails to provide regular updates — even when there is nothing new to report — creates an environment of suspicion and mistrust that can escalate into formal legal action.

Best practice is to send written updates to all beneficiaries at least quarterly, documenting the status of the administration, any significant decisions made, and the expected timeline for distribution. Keeping beneficiaries informed does not require sharing every detail of every transaction — but it does require consistent, transparent communication that demonstrates you are acting in their best interest.

If you are currently serving as executor in San Francisco or Marin County and have questions about your specific situation, a consultation with a Certified Probate & Trust Specialist and an experienced probate attorney is the most important investment you can make in protecting yourself and the estate.