What Should Trustees Know About Income vs. Principal Taxation in Trusts?

Introduction

When managing a trust, one of the most misunderstood yet critically important responsibilities is correctly classifying income and principal. These classifications not only dictate how and to whom distributions are made, but they also carry significant tax consequences for both the trust and its beneficiaries.

For trustees operating under California law, missteps in allocation can lead to IRS penalties, breach of fiduciary duty claims, or even litigation. This article unpacks the legal and tax distinctions between income and principal and highlights the governing rules trustees must follow.

What Is Income vs. Principal?

Income generally refers to earnings generated by trust assets, such as interest, dividends, rental income, and business profits.

Principal (also called corpus) refers to the original assets placed into the trust, as well as capital gains and any additions to the trust estate.

Example: If a trust holds a rental property:

• The rent collected = income
• The property itself = principal

The distinction determines who receives distributions: some beneficiaries may be entitled to income only (e.g., surviving spouses), while others may be entitled to principal upon termination of the trust.

What is Expected from a Trustee in California?

California provides statutory guidance under the Uniform Principal and Income Act, codified in the California Probate Code:

Probate Code § 16340 — Governs how income is defined and allocated

If property is specifically given to a beneficiary, by will or trust, the fiduciary of the estate or of the terminating income interest shall distribute the net income and principal receipts to the beneficiary who is to receive the property:

• The net income and principal receipts from the specifically given property are determined by including all of the amounts the fiduciary receives or pays with respect to the property,
• whether the amounts accrued or became due before, on, or after the decedent’s death or an income interest in a trust ends,
• and by making a reasonable provision for amounts the fiduciary believes the estate or terminating income interest may become obligated to pay after the property is distributed.

Probate Code § 16341 — Covers principal allocations and handling of capital gains, expenses, and depreciation

Beneficiaries are entitled to receive a portion of the net income equal to the beneficiary’s fractional interest in undistributed principal assets, using values as of the distribution dates and without reducing the values by any unpaid principal obligations.

If a fiduciary does not distribute all of the collected but undistributed net income to each beneficiary as of a distribution date, the fiduciary shall maintain appropriate records showing the interest of each beneficiary in that net income.

Under California law, trustees are expected to:

• Maintain impartiality between income and remainder beneficiaries
• Follow the terms of the trust instrument first; if silent, then apply statutory rules
• Maintain accurate records of how income and principal are tracked and distributed

Failure to do so can result in fiduciary liability.

What are Income Reporting Requirements Under Federal Tax Law?

While California governs the definitions and distribution structure, federal law governs taxation. The IRS requires that:

• Each beneficiary include in income the amounts paid, credited, or required to be distributed to him or her in the tax year,
• and the tax liability is allocated to the beneficiary entitled under the trust to receive the income.

Key provisions:

• IRC § 662: Taxation of beneficiaries
• IRC §§ 666–671: Rules on distributable net income (DNI), accumulation distributions, and grantor trusts

Key Insight: The way trustees allocate funds under California law affects who pays the taxes under federal law. Misclassification can trigger audits, interest, and penalties.

What is a Possible Result of Litigation and Accounting Errors?

Poor recordkeeping and improper classification of income vs. principal plays a role in trustee liability:

• If trustees fail to properly divide administrative vs. litigation fees, or
• act without adequate understanding of income allocation rules,

a court may find that some actions unfairly benefited one set of beneficiaries over another. This shows how technical distinctions like income vs. principal can have major legal consequences.

What are a Trustee’s Best Practices Regarding Taxation?

• Review the trust instrument carefully: It may contain custom rules on allocation.
• Apply California Probate Code standards if the document is silent.
• Track all transactions clearly, using separate ledgers if needed.
• Consult a CPA or trust tax attorney before making complex distributions.
• Disclose allocations to beneficiaries regularly to reduce confusion or disputes.

Does the Tax Burden Regarding Trust Expenses Fall on the Income or the Principal?

In California, trust expenses (including taxes) are generally paid from the income generated by the trust. Court rulings say the tax burden falls on the income received, not the principal amount.

Under California Probate Code § 16374, tax required to be paid by a trustee based on receipts allocated to income shall be paid from income. With this, California probate courts have ruled that adjustments in distributions are based on income that is taxable and principal that is not taxable.

In Estate of Bixby, 55 Cal. 2d 819 (Cal. 1961), the court stated that if there is a detriment suffered to the corpus account, a possible solution would be to reallocate enough of the tax savings to the principal account to make whole such detriment.

Estate of Dehgani-Fard, 141 Cal. App. 4th 797 (Cal. Ct. App. 2006), describes the intention of Bixby, stating that the burden of tax accompanies the income, and should be borne by the account into which the taxed item goes, in that taxable year.

Conclusion

The classification of income and principal is far more than an accounting exercise—it affects beneficiary rights, trust taxation, and the trustee’s legal liability. Understanding the differences and applying both California law and federal tax rules is essential to proper trust administration.

C. Tucker Cheadle Law helps trustees and beneficiaries resolve disputes and ensure legal compliance across California, specifically in Orange County, Los Angeles County, San Bernardino County, Riverside County, San Diego County, San Francisco County, Marin County, Santa Clara County, Santa Maria County, Stanislas County, Yolo County, Napa County, San Jose County, Santa Barbara County, Tucker County, San Luis Obispo County, and Amador County.

Call 949.553.1066 to schedule a consultation.

This article is designed only to provide a general background and is not legal advice. If you need legal advice, please contact C. Tucker Cheadle at 949.553.1066 and after providing all the important facts and information, a legal opinion can be made. A review of any materials on this web page, any preliminary comments or an introductory meeting does not constitute legal, income tax or accounting advice upon which reliance can be placed. The attorney–client relationship can only be created by a written retainer agreement following a check of potential and actual conflicts of interest with other clients.