Handling Unfiled Tax Returns

I recently had a client, Larry, call me in a panic. His mother had passed away unexpectedly, and he’d been tasked with settling her estate. He’d found a stack of unopened mail, including numerous notices from the IRS and the California Franchise Tax Board. Larry hadn’t even known his mother hadn’t filed taxes for the past five years. The cost? Beyond the mounting penalties and interest, Larry faced potential scrutiny—and even criminal charges—for failing to fulfill his fiduciary duty as executor. It’s a nightmare scenario, but tragically common.

As an Estate Planning Attorney and CPA with over 35 years of experience, I’ve seen firsthand how unfiled tax returns can derail even the most well-intentioned estate administration. It’s not just about the money; it’s about compliance, protecting your personal reputation, and ensuring a smooth transfer of assets. The executor is legally responsible for all aspects of the estate, including filing and paying the deceased’s final taxes.

The complexity arises because simply preparing and filing these delinquent returns isn’t always enough. Often, there’s a need to reconstruct financial records, determine the basis of assets, and understand the potential capital gains implications. This is where a CPA’s expertise is invaluable. We can not only prepare accurate returns but also minimize tax liabilities by utilizing strategies like step-up in basis and proper asset valuation. For example, if your mother owned real estate, knowing the fair market value at the time of her death is crucial for calculating capital gains taxes when the property is eventually sold. Without a professional valuation, the IRS or FTB can—and will—challenge your figures.

What Steps Should I Take If I Discover Unfiled Tax Returns?

First, don’t panic, but do act quickly. Ignoring the issue will only exacerbate the problem. Assemble all available financial records – bank statements, brokerage statements, income statements, even checkbook registers. Anything that can help reconstruct the deceased’s income and expenses. Then, contact a qualified professional, ideally an attorney with CPA credentials.

What are the Potential Penalties for Unfiled Tax Returns?

The penalties can be substantial. The IRS charges failure-to-file penalties, which accrue at a rate of 5% of the unpaid taxes per month or part of a month the return is late, up to a maximum of 25%. There are also failure-to-pay penalties, plus interest on both the unpaid taxes and the penalties. California has similar penalties and interest rates. More importantly, as Larry’s case illustrates, you, as the executor, could be personally liable for these penalties if you knowingly neglect your fiduciary duties.

Can I Avoid Probate If Unfiled Returns are an Issue?

It depends. For deaths on or after April 1, 2025, executors may avoid full probate for personal property under $208,850. Notably, AB 2016 now allows a simplified ‘Petition to Determine Succession’ for a primary residence valued up to $750,000. Per Probate Code § 13050, you MUST exclude all California-registered vehicles and up to $20,875 in unpaid salary from the small estate calculation. However, unfiled tax returns can complicate this process, especially if the estate’s value is close to the threshold, or if there are disputes over asset ownership. A thorough review of the deceased’s assets and liabilities is essential.

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

In California, a last will and testament is reviewed under probate standards that focus on intent, capacity, and execution. Clear drafting reduces ambiguity, limits misinterpretation, and helps families avoid unnecessary conflict during estate administration.

To distribute property effectively, you must define estate assets, clarify who inherits, and understand how debts and taxes impact the final distribution.

When a will is drafted with California probate review in mind, it becomes a stabilizing roadmap rather than a source of conflict. Clear intent, proper authority, and compliant execution protect both families and estates.

Official Legal Standards and Resources for California Executors

• Mandatory Judicial Forms:
  Judicial Council of California – Probate Forms (DE Series)
  The official repository for all “Decedents’ Estates” forms; in 2026, this includes mandatory updated forms for the $208,850 Small Estate threshold and the new AB 2016 simplified petitions for primary residences valued under $750,000.
• Riverside County Local Rules:
  Riverside Superior Court – Executor FAQ
  A localized resource for Riverside County fiduciaries that outlines 2026 requirements for mandatory e-filing, Local Rule 7010 for remote appearances, and specific duties regarding the 4-month creditor claim period.
• Federal Tax Compliance:
  IRS Guidelines for Executors (Form 706 & 1041)
  The authoritative federal guide for filing a final 1040 and the estate’s 1041; it reflects the 2026 OBBBA update, which established a permanent $15 million individual estate tax exemption, effectively ending the previous “tax cliff” uncertainty.
• Statutory Duty of Care:
  California Probate Code § 9600 (The Prudent Person Rule)
  Codifies the “Prudent Person Rule,” stipulating that an executor must manage estate assets with reasonable care and skill; it remains the primary legal standard in 2026 for determining if a fiduciary is liable for mismanagement or “surcharge.”
• Digital Asset Authority:
  Revised Uniform Fiduciary Access to Digital Assets Act (RUFADAA)
  Access California Probate Code §§ 870-884, which governs an executor’s power to manage online accounts; it clarifies why service providers can legally block access to private emails and crypto-wallets without explicit “prior consent” in the estate plan.