Back to Glossary

Entry · Legal

Fiduciary Negligence

Fiduciary negligence is the failure of someone entrusted with another person's money or interests to act with the care and skill the role demands. It is not the same as dishonesty; a trustee who simply fails to monitor investments, keep records or take advice can be negligent without ever intending harm.

The usual remedy is compensation for the loss the beneficiary suffered as a result.

From the Money Master HQ dictionary, founded by Shihan Sheriff (FCMA, VP of Finance at Nomod, CFO at Esanjo Ventures). How these definitions are written.

What it means

A fiduciary is anyone who has accepted a duty to act for someone else's benefit: a trustee, a company director, a pension scheme administrator, an attorney under a power of attorney, an investment manager. The duty has two halves, loyalty and care, and negligence is a failure of the second.

Breach of loyalty is about conflicts of interest and self-dealing, while breach of care is about competence and attention. Leaving a trust's cash in a non-interest-bearing account for five years, never reviewing a concentrated shareholding, or selling an asset without obtaining a valuation are all failures of care rather than of honesty.

The standard applied is usually that of a prudent person managing someone else's affairs, and it rises with the fiduciary's own expertise. A professional trustee is judged more strictly than a family member who agreed to help, because holding yourself out as an expert imports the expert's standard.

Proving negligence generally requires four things: a fiduciary relationship, a duty that was breached, a loss, and a causal link between the breach and the loss. The last of those does most of the work in practice, because a portfolio that fell during a general market decline has not necessarily fallen because of anything the trustee did.

Damages are typically measured by restoring the beneficiary to the position they would have occupied had the duty been performed properly. That usually means comparing the actual outcome with a benchmark of what a prudently managed equivalent would have produced, which is why the choice of benchmark is often the most fiercely contested part of a case.

In practice

Real-world examples.

1

Example

The trustees of a small charitable foundation leave $800,000 sitting in a current account for six years while grant applications are considered. A donor challenges the decision, and the trustees agree to make good roughly $189,000 of interest that a simple cash management policy would have earned over the period.

2

Example

A company director signs off a $3,000,000 acquisition without reading the due diligence report or asking why the seller's revenue had halved. When the acquired business collapses within a year, shareholders bring a claim arguing that the failure to read the report was itself the breach, regardless of whether the deal might have worked out.

3

Example

A pension scheme administrator fails to reconcile member contributions for three years and only then discovers that payments for 40 members were never invested. The scheme has to buy the missing units at current prices, and the $260,000 shortfall is met by the administrator's professional indemnity insurer.

Formula

Calculation

Damages = the value the fund should have reached under prudent management - its actual value. The prudent value is usually a benchmark portfolio compounded over the period: Benchmark value = initial value x (1 + benchmark return) raised to the number of years A trustee takes over a $2,000,000 trust and leaves the whole amount in a single stock for four years, despite a trust deed requiring diversification. A prudently diversified portfolio at the agreed risk level would have returned 7% a year over that period. The trust is now worth $1,600,000. Benchmark value = $2,000,000 x 1.07^4 1.07 x 1.07 = 1.1449 1.1449 x 1.1449 = 1.310796 $2,000,000 x 1.310796 = $2,621,592 Damages = $2,621,592 - $1,600,000 = $1,021,592 The trustee is not liable for the fall in that particular stock as such. The liability arises because the concentration itself breached the duty of care, and the measure is the gap between the prudent outcome and the actual one.

Case study

Seen in the real world.

The Delaney Family Trust described here is entirely fictional and is used only to illustrate a common pattern. A retired accountant agreed to act as sole trustee for his late brother's $2,400,000 estate, held for two nieces until they turned thirty, and he did so conscientiously in every respect except one: he never reviewed the portfolio he inherited, which was 80% invested in shares of his brother's former employer.

Over seven years that holding fell heavily while a diversified portfolio of the same risk profile rose. By the time the nieces reached thirty the trust held $1,450,000 against a benchmark value calculated at $3,600,000, a shortfall of $2,150,000. The trustee had taken no fee, had no conflict of interest and had acted in complete good faith, none of which answered the point that he had never once obtained investment advice.

The illustrative lesson is that fiduciary negligence rarely looks like wrongdoing from the inside. Documented reviews, a written investment policy and evidence that professional advice was taken are what separate a decision that can be defended from an absence of any decision at all.

Watch out

Common mistakes.

  • Assuming negligence requires bad intent. A fiduciary who acts honestly but carelessly, or who simply does nothing for years, can still be liable for the resulting loss.
  • Believing that acting without payment removes the duty of care. An unpaid trustee is still held to a prudent standard, even if a professional is judged more strictly still.
  • Treating investment losses as automatic evidence of negligence. A loss caused by a general market fall in a properly diversified portfolio is not a breach of anything.

Questions

People also ask.

How is fiduciary negligence different from breach of fiduciary duty?

Negligence is one species of breach, concerning care and competence, while the broader category also covers disloyalty such as self-dealing and undisclosed conflicts.

Can trustees insure against it?

Yes, through trustee liability or professional indemnity cover, although policies generally exclude dishonest or deliberately reckless conduct.

Does following professional advice protect a fiduciary?

It helps considerably, provided the adviser was suitably qualified, the brief was complete and the fiduciary genuinely applied their own judgement to the recommendation.

Was this explanation helpful?

From the founder's library

Accounting Fundamentals: A Non-Finance Manager's Guide to Finance and Accounting, by Shihan Sheriff

Take it further with the book.

Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.

US$2.24US$2.99

25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.

View the book and save 25%
Last updated · October 8, 2026
Browse all terms →

Disclaimer

The information provided in this finance dictionary is for educational and informational purposes only. It should not be construed as financial, investment, legal, or tax advice. Always consult with a qualified professional before making any financial decisions. Money Master HQ makes no representations or warranties about the accuracy, completeness, or suitability of this information. Use of this content is at your own risk.