Trust Income, DNI, and the Income Distribution Deduction

Figures: tax year 2026

Fiduciary accounting income measures income available under the trust instrument and applicable local law, after charges assigned to income. Corpus, also called principal, holds contributed property and amounts allocated to the remainder interest.

Distributable net income (DNI) measures the current income available for tax allocation between a nongrantor trust and its beneficiaries. It limits income carried to beneficiaries and preserves the character of the income, including its tax-exempt portion.

Taxable income is the trust's federal tax base after allowable deductions, the income distribution deduction and its exemption. The tax liability requires a separate calculation using applicable rates and credits.

The three measures answer different questions.

The governing instrument and applicable fiduciary-accounting law (including the Uniform Principal and Income Act where adopted) identify the allocation of items between income and corpus in a given scenario. Their allocation provisions must also satisfy federal recognition rules; an arbitrary label does not control federal taxable income.

The allocation review follows the underlying transaction.

Common mistakes

• Unwarranted exemption add-back. Starting before both deductions, $\$56{,}000 + \$100 - \$20{,}000 + \$9{,}000$ incorrectly produces $45,100 of DNI.
• Gross exempt interest. Using $\$56{,}000 - \$20{,}000 + \$10{,}000$ produces $46,000 of DNI by overlooking the $1,000 attributable expense.
• Wrong distribution base. Taking the smaller of $30,000 distributions and $36,000 taxable DNI gives a $30,000 deduction; proportionate exempt carryout reduces the correct deduction to $24,000.

Bottom line

• Accounting income follows the governing instrument and applicable local law; federal recognition requirements still apply.
• DNI uses federal expense allocations, includes net exempt interest, and generally excludes capital gain retained in corpus.
• A DNI bridge restores the exemption and distribution deduction only when the starting figure already deducted them.
• Qualifying distributions carry DNI character, and only taxable carryout produces an income distribution deduction.

Exam shortcut

Mark each source item twice: first for income or corpus, then for its federal tax treatment. Keep the two fee allocations in separate columns. Label the federal starting figure before adding anything back. Check whether it already includes the exemption or distribution deduction. Cap total carryout at DNI, then split its character. A distribution below DNI requires applying the exempt percentage to the distribution actually carried out.

The full lesson (about 5,559 words, 37 min read) adds 6 worked examples, all 5 common mistakes, a self-check, free in the app.

Learning objectives

• II.D2

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