Estate & Trust Tax Calculator

Quick summary

The Estate & Trust Tax Calculator handles the most punishing tax regime in the IRS code: compressed trust income tax brackets. Where individuals don't hit the 37% bracket until $640,600 (single) or $768,700 (MFJ), a trust hits 37% at just $16,000 of retained income. The 3.8% NIIT applies above only $16,000 of MAGI — not $200K like individuals.

It models all three trust types: Simple trust (must distribute all income annually — taxed only on capital gains/principal), Complex trust (can accumulate income — full compressed brackets), and Grantor trust (all income flows to grantor's personal return — no separate trust tax).

The Distributable Net Income (DNI) rule is the key planning tool: distributions to beneficiaries CARRY OUT trust income, shifting tax to the (usually lower-bracket) beneficiary. A trustee who fails to distribute by year-end (or by the 65-day rule §663(b) into the next year) wastes thousands in tax via the compressed brackets.

Trust type

Simple: distributes all DNI annually. Complex: may accumulate. Grantor: all income flows to grantor.

Trust ordinary income (interest, div, rents)

Trust long-term capital gain

Distributions to beneficiaries (DNI)

Beneficiary marginal tax rate

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How to use

1 Enter the trust's annual ordinary income (interest, dividends, rental income) and long-term capital gains (typically retained at trust level).
2 Enter distributions made to beneficiaries — these carry out DNI and shift tax to them. Use the 65-day rule (§663(b)) to make 2027 distributions count for 2026.
3 Enter beneficiary's estimated marginal tax rate. Most beneficiaries are at 12-24%; trust retention hits 37% on the first $16K — typically beneficial to distribute.
4 Choose trust type: Simple (must distribute all income), Complex (can accumulate), Grantor (passes everything to grantor — no separate trust tax).
5 Click Calculate to see trust tax on retained income, beneficiary tax on distributions, total combined, and the comparison vs. distributing all income (which often saves thousands).

2026 Trust Tax — Compressed Brackets vs Individual

Income	Trust Rate (Form 1041)	Individual Single Rate	Difference
$3,300	10%	10%	Same
$11,700	24% bracket	12%	Trust pays 2× individual
$16,000	35% bracket	12%	Trust pays 2.9× individual
$50,000	37% bracket	12% bracket	Trust pays 3× individual
$100,000	37%	22% bracket	Trust pays 1.7× individual
$640,600	37%	35% (just below 37% top)	Trust marginally higher

2026 Trust Tax Brackets (Rev. Proc. 2025-32)

Income	Rate	Cumulative Tax
$0 — $3,300	10%	$330 at $3,300
$3,301 — $11,700	24%	$2,346 at $11,700
$11,701 — $16,000	35%	$3,851 at $16,000
Over $16,000	37%	+ 37% on excess

2026 Trust LTCG Brackets

LTCG	Rate
$0 — $3,300	0%
$3,301 — $16,000	15%
Over $16,000	20%

Three Trust Types — Tax Treatment

Trust Type	Tax Treatment	Form 1041 Filing
Simple Trust	Must distribute all income annually; taxed on cap gains/corpus only	Yes — separate entity
Complex Trust	Can accumulate income; full compressed brackets apply	Yes — separate entity
Grantor Trust	All income to grantor; trust files informational only	Yes — informational
Charitable Remainder Trust (CRT)	Tax-exempt; UBTI-style only on certain income	Yes — Form 5227
QSST/ESBT (S-corp eligible)	Special elections; QSST treated as grantor-like for S-corp income	Yes

DNI Distribution Strategy — The 65-Day Rule

IRC §663(b) "65-day rule": a complex trust can elect to TREAT distributions made within the first 65 days of the next tax year as having been made in the previous year. This gives trustees up until early March to make catch-up distributions to beneficiaries that count for the prior year — saving thousands in compressed-bracket trust tax. File the election on Form 1041 for the year it's applied to.

When to Distribute vs. Accumulate

Distribute	Accumulate
Beneficiary in low bracket (<24%)	Beneficiary in high bracket (37%)
Trust would hit 37% bracket	Trust under $3,300 (10% bracket)
Beneficiary needs cash	Trust corpus growth strategy
Avoid NIIT on trust ($16K threshold)	Beneficiary has high MAGI (NIIT anyway)
Spendthrift / asset protection less critical	Beneficiary in lawsuit / divorce risk

FAQ

Q Why are trust tax brackets so compressed?

Trusts hit the 37% top federal rate at just $16,000 of retained income (vs. $640,600 for individual single filers). Congress designed compressed brackets to discourage parking income in trusts to avoid taxation. Result: trust tax planning revolves around DISTRIBUTING income to beneficiaries via DNI rules.

Q What is the 2026 trust tax bracket?

Per Rev. Proc. 2025-32: 10% to $3,300, 24% to $11,700, 35% to $16,000, 37% above. LTCG: 0% to $3,300, 15% to $16,000, 20% above. NIIT 3.8% over only $16,000 MAGI (not $200K like individuals).

Q What is DNI distribution?

Distributable Net Income — when a trust distributes income to beneficiaries, the income CARRIES OUT to them (DNI rules under §651, §661). The trust gets a deduction; the beneficiary picks up the income at their (usually lower) marginal rate. Powerful tax-shifting tool.

Q What is the 65-day rule for trusts?

IRC §663(b): a complex trust can elect to TREAT distributions made within the first 65 days of the next tax year (e.g., March 6, 2027 for 2026) as having been made in the prior year. Saves thousands by shifting income from compressed trust brackets to lower beneficiary brackets.

Q How is a grantor trust taxed?

All income, deductions, and credits flow through to the GRANTOR'S personal return. The trust files Form 1041 as an informational return only (no tax due). Grantor pays at their personal brackets — no compression. Common types: Revocable Living Trust, IDGT, GRAT, QPRT.

Q Should my trust distribute all income?

Generally yes if beneficiaries are in lower brackets than the trust's 37% top. Exception: if beneficiary is in the top bracket, NIIT-affected, or in a lawsuit/divorce, accumulating in the trust may protect assets despite the tax cost.

Q When must I file Form 1041?

When the trust has gross income of $600+ OR any taxable income OR a non-resident alien beneficiary. Due April 15 (calendar year trust); 5.5-month extension available via Form 7004. Quarterly estimated tax via Form 1041-ES if owed > $1,000.

Q What is NIIT on trusts?

The 3.8% Net Investment Income Tax applies to trust MAGI exceeding only $16,000 in 2026 (vs. $200K for individuals). Distributing investment income to beneficiaries can avoid trust-level NIIT entirely if beneficiaries are below their personal threshold ($200K single / $250K MFJ).