When do I need to file a declaration of due diligence

Emily just received a notice from the court. Her mother’s Will, signed three years ago, is being challenged – not for its validity, but because a newly discovered deed transferred a significant portion of the estate’s real property after the Will was executed. Emily now faces potential personal liability for failing to identify this transfer during probate, and legal fees are already exceeding $15,000.

The declaration of due diligence, as outlined in California Probate Code section 16061.7, isn’t a form you proactively file with the court in the usual sense. Instead, it’s a legally mandated response to a specific challenge – a petition for instruction regarding omitted property. Understanding when and how this declaration comes into play is crucial for any executor or administrator navigating a complex estate.

What Triggers the Need for a Declaration of Due Diligence?

You’ll need to prepare and submit this declaration if a beneficiary or other interested party files a petition asking the court to determine the rightful ownership of property not specifically mentioned in the Will or Trust. This typically happens when a deed, transfer on death designation, or other evidence surfaces after probate has begun suggesting an asset was overlooked or improperly transferred. The court will then issue an order requiring the personal representative to demonstrate they exercised reasonable diligence in identifying and collecting all estate assets.

What Does the Declaration Require Me to Prove?

The declaration isn’t simply a statement of good intentions. It demands a detailed accounting of the steps you took to locate assets. Specifically, you must outline:

• Reasonable Inquiry with the Deceased: Did you ask the decedent about their assets during their lifetime? Documentation like notes or emails is extremely helpful here.
• Diligent Search of Records: This includes reviewing bank statements, brokerage accounts, real property records (county assessor’s office), and any other relevant documentation.
• Inquiry with Third Parties: You must show you contacted likely holders of assets, such as banks, insurance companies, and former employers. Keep copies of all correspondence.
• Good Faith Effort: The court will evaluate whether your actions were genuine and thorough, rather than perfunctory.

What Happens If I Don’t Demonstrate Due Diligence?

Failure to adequately demonstrate due diligence can have significant consequences. If the court finds you haven’t met the required standard, it can impose personal liability on you for the value of the omitted property. This means your personal assets could be at risk. Moreover, the court may require you to reimburse the estate for any legal fees incurred due to the omission.

How Does My CPA Background Help in These Situations?

After 35+ years as both an Estate Planning Attorney and a Certified Public Accountant, I’ve seen firsthand how a proactive, tax-sensitive approach to probate administration can minimize these risks. My CPA credentials provide a unique advantage when investigating asset holdings. I’m trained to identify potentially overlooked accounts and understand the implications of asset transfers on step-up in basis and capital gains taxes. Correctly valuing and classifying assets, especially those with complex tax implications, is vital for a thorough due diligence search. Furthermore, I’m skilled in interpreting financial records and identifying discrepancies that might indicate hidden assets.

What About Small Estates and Simplified Procedures?

Even if the estate qualifies for simplified procedures, like affidavit transfers or the streamlined petition under AB 2016, the due diligence requirement still applies if an omission is alleged. For deaths occurring on or after April 1, 2025, the small estate threshold for personal property is $208,850 (per CPC § 13100). This allows heirs to skip full probate via affidavit. However, this doesn’t eliminate the responsibility to diligently search for and account for all assets. Similarly, under AB 2016, primary residences valued at $750,000 or less qualify for simplified transfer for deaths on or after April 1, 2025. In 2026, this remains active law, allowing qualifying homes to bypass formal probate via a simplified petition rather than a 12-month court process – but due diligence still holds.

What About Creditor Claims and Finalizing the Estate?

Don’t forget that probate cannot be closed until the mandatory 4-month creditor claim period expires under Probate Code § 9100. This window begins the day ‘Letters’ are issued to the representative, serving as a mandatory cooling-off period even if the estate has no known debts. Even after the creditor period closes, diligent record-keeping is crucial. Furthermore, unless explicitly waived in the Will or by all beneficiaries in writing, the court mandates a Surety Bond per Probate Code § 8482. This bond protects the estate’s value; the premium is calculated based on the total value of personal property plus annual income, often costing the estate thousands in non-refundable fees.

What’s Happening with Estate Tax?

The good news is that the 2026 ‘TCJA Sunset’ was officially averted by the One Big Beautiful Bill Act (OBBBA). As of January 1, 2026, the Federal Estate Tax Exemption is permanently set at $15 million per person ($30 million for married couples), effectively eliminating the federal ‘Death Tax’ for nearly all families. However, this doesn’t diminish the importance of thorough asset identification. Correctly valuing the estate remains critical, even if no federal estate tax is due.

How do probate courts in California evaluate intent when a will is challenged?

In California, a last will and testament operates within a probate system that emphasizes intent, clarity, and procedural compliance. When properly drafted, a will does more than distribute property—it creates legally enforceable instructions that guide courts, fiduciaries, and beneficiaries through administration with fewer disputes and less uncertainty.

For California residents, understanding how intent, authority, and compliance interact is one of the most effective ways to protect family harmony and estate integrity. A will that anticipates probate scrutiny is far more likely to be honored as written and far less likely to become the source of unnecessary conflict.

Official 2026 California Probate Standards & Resources

• Probate Process: California Courts – Probate Overview
  This official judicial guide provides a high-level roadmap of the California probate system, defining the roles of executors and administrators while clarifying which assets are subject to court supervision and which bypass the process entirely.
• Unclaimed Property: California State Controller – Unclaimed Property
  A vital resource for estate representatives to search the “Estates of Deceased Persons File,” which contains millions in forgotten bank accounts, uncashed checks, and insurance benefits that must be marshaled and reported as part of a complete estate inventory.
• Probate Code: Probate Code § 13100 (Small Estate Affidavit)
  The primary statute governing the simplified collection of personal property; as of 2026, it allows successors to bypass probate for estates valued at $208,850 or less (for deaths after April 1, 2025), provided a 40-day waiting period has elapsed.
• Local Court Rules: Riverside Superior Court – Probate Division
  Provides essential “Local Rules” and “Proposed Form Changes” effective January 1, 2026, including specific requirements for remote appearances and the mandatory use of the Riverside eSubmit Document Submission Portal for all probate matters in the Inland Empire.
• Tax Guidelines: Franchise Tax Board – Estates and Trusts
  The official California tax portal for fiduciaries, outlining the 2026 filing requirements for Form 541 (Fiduciary Income Tax Return) and explaining when real estate withholding (Form 593) is required for the sale of inherited property.