AICPA Representative Tasks (verbatim). 1. Application: Identify the allocation of items between income and corpus in a given scenario. 2. Application: Calculate a trust's accounting income, distributable net income and taxable income, including the income distribution deduction.
Trust taxation requires distinguishing three separate income calculations, each serving a different purpose.
Trust Accounting Income (TAI) determines distribution requirements under the trust document. It follows fiduciary accounting principles, typically the Uniform Principal and Income Act (UPIA), not tax rules. TAI governs how much a trustee must distribute to income beneficiaries.
Distributable Net Income (DNI) is a tax concept that caps the income distribution deduction and determines the maximum amount taxable to beneficiaries. DNI prevents the same income from being taxed twice, once to the trust and again to the beneficiary.
Taxable Income is the trust's final tax liability computation after deducting distributions and the applicable exemption.
Common mistakes
- Treating capital gains as part of DNI by default. Capital gains allocable to corpus are excluded from DNI unless the instrument or state law directs otherwise. Trap: "capital gains pass through to beneficiaries." Correct: gains stay trapped in the trust unless specifically allocated to income.
- Using the gross tax-exempt interest in DNI rather than the net amount. Expenses allocable to tax-exempt income must reduce the tax-exempt interest before including it in DNI. Trap: "add back the full municipal bond interest." Correct: add back tax-exempt interest net of allocable expenses.
- Forgetting to reduce the income distribution deduction by the tax-exempt ratio. Tax-exempt income flows through to beneficiaries but does not generate a deduction for the trust. Trap: "deduct the entire distribution amount." Correct: reduce IDD by the tax-exempt portion of DNI.
Bottom line
- Trust accounting income (TAI) is set by the governing instrument and state law under fiduciary accounting, not tax law, and controls required distributions.
- Distributable net income (DNI) caps both the income distribution deduction and the amount taxable to beneficiaries.
- DNI equals taxable income before the distribution deduction, plus net tax-exempt income, minus capital gains allocable to corpus, plus the exemption add-back.
- Taxable income for a trust equals gross income minus deductions minus the income distribution deduction minus the exemption ($300 simple trust, $100 complex trust).
Exam shortcut
DNI formula mnemonic: "TEAS minus G". Taxable income + Exemption + tax-exempt interest (net) − capital Gains allocable to corpus. Covers all four adjustments in one phrase. Compression trigger: "$15,650 = 37%". If trust income exceeds this threshold and beneficiaries are in lower brackets, distribution almost always wins on a pure tax basis. Quick math: $10,000 accumulated versus distributed to a 22% beneficiary costs $1,500 in additional tax.
The full lesson (about 2,484 words, 17 min read) adds 2 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- II.D2
Browse all free CPA TCP lessons or jump into free CPA TCP practice questions.