In 1830, a Harvard treasurer named Samuel Gridley Howe faced a novel legal question: when you manage someone else's money, exactly what obligations do you have? The resulting Massachusetts court case, Harvard College v. Amory, established what we now call the "prudent person rule"—a standard that still governs fiduciary accounts today.
The principle is deceptively simple: manage other people's money with the same care a prudent person would use with their own. But defining "prudent" has kept lawyers employed for nearly two centuries.
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Requirements for Fiduciary Accounts
A fiduciary is someone who manages assets for another person's benefit—and must put that person's interests before their own. It's a legal obligation, not just a nice idea. Courts have been enforcing fiduciary duties since medieval England, and the securities industry takes them seriously. Breach your fiduciary duty, and you'll face both civil liability and regulatory consequences.
Types of fiduciary accounts include:
- Custodial accounts (UGMA/UTMA)
- Guardian accounts
- Trust accounts
Documentation Comes First
Fiduciary accounts can't be opened without proper documentation appointing the fiduciary. No court order? No guardian account. No trust agreement? No trust account.
Since the fiduciary is a third party handling someone else's money, only the fiduciary can trade in the account. They cannot delegate that authority to another person—unless the account documents specifically permit it (for example, allowing an outside registered investment adviser to manage the account).
Cash Only (Usually)
Fiduciary accounts are generally CASH ONLY. Margin transactions are prohibited unless the documents appointing the fiduciary explicitly authorize them. The logic: leverage creates risk, and fiduciaries have a duty to protect assets, not gamble with them.
The Prudent Person Rule
Fiduciaries don't have free rein over investments. State law typically requires them to follow one of two standards:
| Standard | Description | Flexibility |
|---|---|---|
| Prudent Person Rule | Only investments that a "prudent person" would make are permitted | More flexible — based on overall approach |
| Legal List | State maintains specific list of acceptable investments | More restrictive — if not on list, not allowed |
Power of Attorney
A power of attorney (POA) isn't an account type—it's a grant of authority. It allows someone to act on behalf of an account owner.
A full POA allows the agent to trade and make withdrawals. A limited POA might restrict actions to trading only.
Durable vs. Nondurable
| Type | If Grantor Becomes Mentally Incompetent | At Death of Grantor |
|---|---|---|
| Durable POA | POA REMAINS in effect | POA TERMINATES |
| Nondurable POA | POA TERMINATES | POA TERMINATES |
A person who is incarcerated can still grant a POA to manage their financial affairs. Being in prison doesn't eliminate your legal capacity—it just limits your physical access.
Custodial Accounts (UGMA/UTMA)
Custodial accounts allow an adult to manage investments on behalf of a minor. The adult has trading authority; the minor is the legal owner.
Two types dominate: UGMA and UTMA.
UGMA: Uniform Gifts to Minors Act
UGMA was created in 1956 to simplify gifts to minors. Before UGMA, giving securities to a child required establishing a formal trust—expensive and complicated. UGMA created a standardized, simple custodial arrangement that any adult could establish at any brokerage firm.
Key features of UGMA accounts:
- One custodian, one minor per account
- The custodian must be an adult; they don't need to be related to the minor
- The minor is the legal owner of all assets
- Account is opened under the minor's Social Security number
- Gifts are irrevocable—once given, they cannot be taken back
- Gifts can be cash or fully paid securities
When the minor reaches the age of majority (varies by state—typically 18 or 21), full control of the assets transfers to them. No exceptions.
Investment limitations: UGMA accounts can only hold financial assets—stocks, bonds, mutual funds. No real estate. No collectibles. No uncovered options.
UTMA: Uniform Transfers to Minors Act
UTMA expanded on UGMA with two key differences:
| Feature | UGMA | UTMA |
|---|---|---|
| Asset types | Financial assets ONLY | Can include REAL ESTATE |
| Transfer timing | At age of majority (no delay) | Can DELAY up to age 25 |
| Custodian, minor | One each | One each |
| Gifts irrevocable? | Yes | Yes |
Fiduciary Duties of Custodians
The custodian's obligations are specific and enforceable:
| Requirement | What It Means |
|---|---|
| Prudent investor rule | Investments must follow prudent portfolio standards |
| Document withdrawals | Any funds used must be for the minor's benefit and documented |
| Cash accounts only | NO margin trading—period |
| No pledging securities | Can't use minor's assets as loan collateral |
| Reinvest cash promptly | Cash dividends must be reinvested within reasonable time |
| No naked calls | Risk too high for minor's account |
| Accountability | Minors can SUE custodians for mismanagement |
The Kiddie Tax
- Dividends, interest, and capital gains are unearned income
- A portion is taxed at the minor's rate (usually low)
- Above threshold, the parent's/guardian's rate applies
- Regardless of rate, taxes are the child's responsibility
The IRS designed these rules—often called the "kiddie tax"—to prevent wealthy parents from shifting investment income to children in lower tax brackets.
Death of a Minor
If the minor dies before reaching adulthood, the assets pass to the minor's estate—not directly to the parents. This can create estate complications.
Test Tip: Don't confuse UGMA/UTMA accounts with ABLE accounts. ABLE (Achieving a Better Life Experience) accounts are for people with disabilities and can be established for either a child or an adult up to age 26. Different purpose entirely.
Guardian Accounts
A guardian account is for situations where a court has intervened—either to protect a minor's assets or to manage finances for an adult who lacks mental capacity.
The key difference from custodial accounts: court appointment is required.
To open a guardian account, the firm needs a copy of the court order appointing the guardian. The account cannot be opened only in the name of the minor or incompetent adult—the guardian must be part of the registration.
Trust Accounts
Trusts are the most flexible—and complex—fiduciary structure.
The trust concept dates to medieval England, where Crusaders leaving for the Holy Land needed someone to manage their estates while they were away (or, more commonly, dead). The "use" or trust allowed property to be held by one person for the benefit of another—a structure that survived eight centuries of legal evolution to become the foundation of modern estate planning.
The basic architecture:
- Grantor (also called trustor, donor, or settlor): Creates the trust and transfers assets
- Trustee: Manages the assets according to the trust's terms
- Beneficiary: Eventually receives the assets
Opening a Trust Account
The firm needs a copy of the trust agreement, which specifies:
- What transactions the trustee can perform
- Who has trading authority
- Whether margin is permitted (prohibited unless specifically authorized)
The grantor can appoint themselves as trustee. Many living trusts work this way—the same person creates the trust, manages it, and benefits from it during their lifetime.
Revocable vs. Irrevocable Trusts
| Feature | Revocable Trust | Irrevocable Trust |
|---|---|---|
| Can be changed? | YES — can modify or dissolve | NO — permanent once created |
| Included in grantor's estate? | YES — no estate tax benefit | NO — removed from estate |
| Separate tax ID? | NO — uses grantor's SSN | YES — separate taxpayer |
| Grantor control | FULL control retained | NO control after creation |
The most common form is the revocable living trust—a trust that can be revoked at any time before death. Advantage: flexibility. Disadvantage: no estate tax savings.
Living vs. Testamentary Trusts
| Feature | Living Trust | Testamentary Trust |
|---|---|---|
| When created | While grantor is ALIVE | At grantor's DEATH (via will) |
| Avoids probate? | YES | NO — will must go through probate first |
| Immediate effect? | YES — active immediately | NO — only after death |
Charitable Trusts
A charitable remainder trust (CRT) works like this:
- Donor transfers assets to the trust
- Donor receives fixed income from the trust during their lifetime
- After death, remaining assets go to the charity
CRTs are irrevocable—once established, they can't be undone. The donor gives up ownership but gains a steady income stream and a charitable tax deduction.
Summary & Key Points
Fiduciary accounts exist because not everyone can—or should—manage their own investments. Whether it's a minor who can't legally trade, an incompetent adult who needs protection, or a grantor who wants professional management, fiduciary structures provide the legal framework.
The common thread: someone is responsible for managing assets in another person's best interest. That responsibility is legally enforceable—and the securities industry has specific rules about how these accounts must be opened and operated.
Test Tip: For custodial accounts, remember "one and one"—one custodian, one minor. Also remember that UGMA = financial assets only; UTMA = can include real estate and allows delayed transfer.
Key Points to Remember
- Fiduciary accounts are generally cash-only — no margin without specific authorization
- UGMA vs. UTMA — UTMA allows real estate and delayed transfers
- POA ceases at death — both durable and nondurable
- Revocable trusts don't avoid estate taxes — assets still in grantor's estate
- Testamentary trusts don't avoid probate — created through a will
Key Terms
- Fiduciary: Person who manages assets for another's benefit
- UGMA: Uniform Gifts to Minors Act — custodial account for financial assets
- UTMA: Uniform Transfers to Minors Act — allows real estate, delayed transfer
- Revocable Trust: Can be changed; assets remain in grantor's estate
- Irrevocable Trust: Cannot be changed; removes assets from estate
Important Rules
- Custodial accounts: One custodian, one minor
- POA terminates at grantor's death (all types)
- Fiduciary accounts: Cash only unless documents authorize margin
- Minors can sue custodians for mismanagement