Section 643(b) and Trusts

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Jason B. Freeman

Jason B. Freeman

Managing Member


Mr. Freeman is the founding member of Freeman Law, PLLC. He is a dual-credentialed attorney-CPA, author, law professor, and trial attorney.

Mr. Freeman has been named by Chambers & Partners as among the leading tax and litigation attorneys in the United States and to U.S. News and World Report’s Best Lawyers in America list. He is a former recipient of the American Bar Association’s “On the Rise – Top 40 Young Lawyers” in America award. Mr. Freeman was named the “Leading Tax Controversy Litigation Attorney of the Year” for the State of Texas for 2019 and 2020 by AI.

Mr. Freeman has been recognized multiple times by D Magazine, a D Magazine Partner service, as one of the Best Lawyers in Dallas, and as a Super Lawyer by Super Lawyers, a Thomson Reuters service. He has previously been recognized by Super Lawyers as a Top 100 Up-And-Coming Attorney in Texas.

Mr. Freeman currently serves as the chairman of the Texas Society of CPAs (TXCPA). He is a former chairman of the Dallas Society of CPAs (TXCPA-Dallas). Mr. Freeman also served multiple terms as the President of the North Texas chapter of the American Academy of Attorney-CPAs. He has been previously recognized as the Young CPA of the Year in the State of Texas (an award given to only one CPA in the state of Texas under 40).

Recently, there seems to be some confusion regarding section 643(b) of the Internal Revenue Code of 1986, as amended (the “Code”), and its application to trusts. Indeed, that provision—particularly to those not well-versed in federal trust taxation—can confound many. This article seeks to dispel some of the complexity surrounding section 643(b).

The Taxation of Trusts Generally

The federal income taxation of trusts and beneficiaries puzzles even tax professionals. Does the trust pay tax? What about the beneficiaries? What is the difference between a grantor trust and a complex trust? The questions can become endless.

I don’t seek to answer all those here. But I will try to provide some background on certain trust concepts so that you are more familiar with them. First, let’s start off with general concepts associated with the taxation of trusts. In Subchapter J of the Code (which addresses the taxation of trusts), it states in the very first provision: “[t]he tax imposed by section 1(e) shall apply to the taxable income of . . . any kind of property held in trust[.]”[i] That same provision further clarifies that this income includes: (i) income accumulated in trust (even contingent income or income for the benefit of unascertainable persons); (ii) income that a trustee is required distribute to the beneficiaries; and (iii) income that the trustee has discretion to retain in trust.[ii] Accordingly, as a general rule, a trust pays income tax on its activities.

Of course, as with many rules in the Code, there are exceptions. For example, Subchapter J can in certain instances subject grantors of so-called grantor trusts to taxation.[iii] And, there are various provisions in Subchapter J that may also make the trust beneficiaries taxable.[iv] Taken together, Subchapter J taxes the grantor, the trust, or the beneficiaries, depending largely on the trust arrangement and governing state law.

Second, let’s also provide some clarity on the distinction between simple and complex trusts and why the distinction can be important. Generally, a trust is a simple trust if it meets all of the following requirements: (i) the trustee is required to distribute all income to the beneficiaries each year; (ii) the terms of the trust do not provide for any amounts to be paid, permanently set aside, or used for certain charitable purposes; and (iii) the trustee does not actually distribute any amounts during the year other than amounts that are required to be distributed annually (i.e., it does not distribute corpus or principal).[v] If a trust fails to meet any one of these three requirements in a tax year, the trust is characterized as a complex trust for federal income tax purposes. The distinction becomes important under Subchapter J because the characterization of the trust can impact the proper party or entity to pay income tax on the trust’s activities.

Section 643(b)

Subchapter J has a litany of definitions, and many of these definitions are found in section 643. Amongst these definitions is a definition for the term “income.”[vi] Specifically, section 643(b) provides:

For purposes of this subpart and subparts B, C, and D, the term ‘income,’ when not preceded by the words ‘taxable,’ ‘distributable net,’ ‘undistributed net,’ or ‘gross,’ means the amount of income of the . . . trust for the taxable year determined under the terms of the governing instrument and applicable local law. Items of gross income constituting extraordinary dividends or taxable stock dividends which the fiduciary, acting in good faith, determines to be allocable to corpus under the terms of the governing instrument and applicable local law shall not be considered income.

Section 643(b) is a very old provision—it dates back approximately 70 years to the Internal Revenue Code of 1954, the predecessor of the current Code. It has remained the same since its enactment, and its legislative history states its purpose:

[Section 643](b) provides that the term ‘income’ when used in subparts A, B, C, and D, and when not preceded by the words ‘taxable,’ ‘distributable net,’ ‘undistributed net,’ or ‘gross,’ means the income of the . . . trust as determined under its governing instrument and the applicable local law. This definition eliminates the difficulty occasioned in section 162 of the 1939 Code where the term ‘income’ was used in certain contexts to mean ‘gross income’ and in others to mean income for fiduciary accounting purposes.[vii]

The Significance of Section 643(b)

Given the above legislative history and a full and complete reading of the Code, it is clear that Congress enacted section 643(b) to provide clarity to the various concepts of income found throughout Subchapter J. These include, for example: taxable income, distributable net income, undistributed net income, and gross income. Section 643(b) adds another term—simply, “income,” which refers to fiduciary accounting income of the trust. Although the concept of fiduciary accounting income, or FAI, is itself a complex concept because it depends largely on applicable state law and the trust agreement itself, readers should take away this from this article: to the extent someone is referring to section 643(b) in a trust context, they are really only referring to FAI or the manner in which income is allocated amongst principal and income beneficiaries of the trust.

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Probate, Trust, and Fiduciary Litigation

Freeman Law represents clients in probate proceedings, will contests, trust and fiduciary litigation, and disputes involving the administration of estates and trusts. We represent executors, administrators, trustees, beneficiaries and heirs. Freeman Law offers a unique blend of legal skills and accounting background, a combination that positions our firm to represent clients in even the most complex probate, trust, and fiduciary litigation. Schedule a consultation today or call (214) 984-3000 to discuss your probate, trust, and fiduciary litigation concerns. 


[i] I.R.C. § 641(a).

[ii] See id.

[iii] I.R.C. § 671-679.

[iv] I.R.C. § 662.

[v] I.R.C. § 651(a).

[vi] See I.R.C. § 643(a) (DNI); § 643(b) (“income”).

[vii] H.R. Rept. No. 1337, 83d Cong., 2d Sess. (Mar. 9, 1954).