When a Manhattan father passes away and leaves a $4 million estate in trust for his children, the appointed trustee—often the eldest sibling—usually assumes their main job is simply not to lose the money. They log into the inherited brokerage account, look at the portfolio, and decide to leave everything exactly as it is, or perhaps move it all into a generic index fund. Nine months later, when a younger sibling demands a formal accounting in New York County Surrogate’s Court, that eldest sibling discovers a hard truth. Managing trust fund investments is not about casual financial maintenance. It is a strict legal duty. Good intentions do not protect you from personal liability.
The Standard of Prudence
At Morgan Legal Group, we spend a considerable amount of time counseling newly appointed trustees who misunderstand their role. A trust is a vehicle for legacy stewardship, and the person managing it is a fiduciary. Under New York law—specifically the Prudent Investor Act found in EPTL §11-2.3—a trustee must invest and manage trust assets as a prudent investor would, exercising reasonable care, skill, and caution.
This statute changes the entire framework of how money is handled. You cannot treat trust fund investments the way you treat your personal brokerage account. If you lose your own money on a speculative tech stock, that is your problem. If you lose trust money on that same stock, the beneficiaries can ask the court to surcharge you—meaning you pay the trust back out of your own pocket. Conversely, leaving the entire fund in a zero-interest checking account for five years out of fear of market volatility is also a breach of duty, as inflation quietly erodes the purchasing power of the principal. The law demands deliberate, documented strategy. Intentionality.
The Mandate to Diversify
Under EPTL §11-2.3(b)(3)(C), a trustee is generally required to diversify the trust fund investments. We frequently encounter situations where a trust is funded entirely by a single concentrated asset—often stock in a closely held family business or shares in a public company the grantor worked at for forty years. The surviving family might feel a deep emotional attachment to that specific stock. They might argue that selling it disrespects the grantor’s memory.
Surrogate’s Court does not care about emotional attachments. Unless the trust document specifically waives the duty to diversify—and waives it with precise, unambiguous language—holding onto a massive, concentrated position is a severe legal risk. If that single stock plummets, the trustee can be held personally responsible for the resulting destruction of wealth. A prudent custodian strips away the emotion and diversifies the portfolio to protect the principal against catastrophic, single-asset failure.
Balancing Present and Future Generations
One of the most difficult aspects of managing these assets is the inherent conflict between different classes of beneficiaries. Most generational trusts are structured to provide income to one person during their lifetime—perhaps a surviving spouse—while preserving the underlying principal for the children to inherit later.
If the trustee invests entirely in high-yield corporate bonds to maximize the monthly payouts for the spouse, the principal will likely stagnate, harming the children’s eventual inheritance. If they invest purely in growth stocks that pay no dividends, the children’s remainder grows, but the surviving spouse is left with insufficient income to pay their living expenses. Fiduciary duty requires the trustee to act impartially. Every investment decision must balance the competing needs of the current income beneficiaries and the future remainder beneficiaries.
The Role of Delegation and Documentation
No one expects a family trustee to possess the financial acumen of a professional portfolio manager. The law recognizes this limitation. Trustees are explicitly permitted to delegate the management of trust fund investments to financial advisors. However, the act of delegation itself must be prudent.
You cannot simply hand the funds over to a broker and walk away. When retaining outside investment counsel, a trustee must take deliberate steps to document their oversight:
- Define the strategy: Establish a written Investment Policy Statement (IPS) detailing the trust’s objectives, risk tolerance, and time horizon.
- Monitor performance: Review statements periodically to confirm the advisor is adhering to the agreed-upon risk parameters and avoiding unauthorized speculation.
- Evaluate costs: Ensure the fees charged by financial institutions are reasonable and do not unnecessarily deplete trust assets over time.
If the advisor consistently underperforms or takes unapproved risks, your fiduciary duty requires you to replace them. Delegation transfers the day-to-day trading responsibility, but the ultimate accountability always remains with the trustee.
Serving as a trustee is an exercise in risk management and generational stewardship. If you have recently assumed control of a trust and are unsure if the current portfolio meets the state’s legal requirements, do not wait for a beneficiary to demand an accounting. Schedule a fiduciary risk assessment to review your trust’s investment policy statement and confirm your asset allocation aligns with New York law.
