By Harry Prabandham · Updated September 28, 2026
Estate & Legacy
Trust Administration Basics: What a Trustee Must Do
A trustee must follow the trust, act loyally and prudently, inform beneficiaries, and file tax returns. In 2026, trust income over $16,000 is taxed at 37%.
Trust Administration Basics: What a Trustee Must Do
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What does a trustee have to do?
- Follow the trust terms and act solely in the beneficiaries' interest, avoiding self-dealing.
- Invest prudently under the prudent investor rule, which looks at the portfolio as a whole and generally calls for diversification.
- Keep trust property separate, keep accurate records, and account to beneficiaries.
- Treat beneficiaries impartially, including current and future beneficiaries.
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Full Guide
What does a trustee have to do?
- Follow the trust terms and act solely in the beneficiaries' interest, avoiding self-dealing.
- Invest prudently under the prudent investor rule, which looks at the portfolio as a whole and generally calls for diversification.
- Keep trust property separate, keep accurate records, and account to beneficiaries.
- Treat beneficiaries impartially, including current and future beneficiaries.
What happens when a trust becomes irrevocable?
- In California, the trustee must notify beneficiaries and heirs within 60 days after a revocable trust becomes irrevocable, usually at the settlor's death.
- The trustee obtains a tax ID number for the trust and retitles or re-registers accounts.
- Date-of-death values are documented to establish new basis where it applies.
How are trusts taxed?
- A grantor trust's income is reported by the grantor; a non-grantor trust files Form 1041.
- In 2026, non-grantor trust income is taxed at 37% above $16,000 of taxable income, and the 3.8% net investment income tax can apply.
- Distributions generally carry taxable income to beneficiaries, who report it from a Schedule K-1.
- The 65-day election lets a trustee treat distributions made early in the next year as made in the prior year.
How should distributions be handled?
- Read the trust for mandatory distributions and discretionary standards, such as health, education, maintenance, and support.
- Consider the beneficiary's other resources, taxes, creditors, and eligibility for public benefits.
- Document the reasons for discretionary decisions.
What are the common trustee mistakes?
- Leaving assets untitled in the trust, which can force some through probate.
- Missing tax filings or ignoring estimated tax payments.
- Mixing personal and trust funds, or favoring one beneficiary without authority.
- Failing to provide required notices and accountings.
Key takeaways
- Trusteeship is a legal role with duties of loyalty, prudence, impartiality, and reporting.
- Compressed brackets make distribution decisions a tax question as well as a family one.
- Good records and timely notices reduce disputes and liability.
- Rubric supports trustees on investment management as part of overall wealth management; legal and tax questions go to trust counsel and a CPA.
Related Topics
How Trusts Are Taxed: Grantor vs. Non-Grantor, DNI, and K-1s
Grantor trust income is taxed to the grantor. A non-grantor trust pays its own tax on retained income, and beneficiaries pay tax on what is distributed.
Tax PlanningTrust Tax Rates: Managing Compressed Brackets
Non-grantor trusts hit the 37% bracket above $16,000 of taxable income in 2026. Distributions, the 65-day election, and grantor status shift the tax.
Estate & LegacyThe Probate Process: How It Works and How Assets Avoid It
Probate is the court process that validates a will, pays debts, and distributes assets. Trusts, beneficiary designations, and joint titles can avoid it.