State Income Tax on Trusts: What Successor Trustees Miss — and How to Reduce It

Most successor trustees are vaguely aware that trust income is taxed at compressed federal brackets — 37% on income above roughly $15,200 — and focus their planning there. What they often miss is that multiple states impose income tax on top of that, with their own nexus rules that can surprise trustees who live in high-tax states, manage trusts created elsewhere, or serve a trust with California or New York beneficiaries. This guide explains how states tax trusts, which states are most aggressive, what the Supreme Court has said, and the legal options for reducing the combined tax bill.

Why state trust taxes are underappreciated

Individual taxpayers know their state income tax — it shows up on a W-2 and gets filed on the same return as everything else. Trust taxes are invisible until the CPA bills arrive. The trust pays state income tax on Form 541 (California), Form IT-205 (New York), or equivalent — entirely separate fiduciary returns that many first-time successor trustees don't know exist.

The stakes are high for three reasons:

• Federal trust brackets compress the 37% rate to roughly $15,200 of taxable income — a level many moderately-sized trusts exceed easily on interest, dividends, and rent alone
• State rates in California, New York, Minnesota, Oregon, and New Jersey range from 9%–13.3% on top of that
• Multiple states can simultaneously claim taxing authority over the same trust income — each under a different legal theory

State income taxes paid by the trust are deductible on Form 1041 under IRC § 164, which partially offsets the cost at the federal marginal rate. The SALT deduction cap (IRC § 164(b)(6)) was designed for individual Schedule A itemized deductions and does not apply to trust deductions on Form 1041 — trusts retain the full state income tax deduction. But deductibility doesn't eliminate the cost; it reduces it.

How states establish nexus: four theories

No uniform federal rule governs when a state may tax a trust. States have developed four distinct nexus theories, and some states use more than one simultaneously:

The Kaestner decision: what the Supreme Court said and didn't say

In North Carolina Department of Revenue v. Kimberley Rice Kaestner 1992 Family Trust (2019), the United States Supreme Court unanimously ruled that North Carolina could not tax a trust's accumulated income solely because a beneficiary happened to live in North Carolina.

The key facts: the trust was created in New York, administered by a New York trustee, governed by New York law, and held no assets in North Carolina. During the years at issue, the beneficiary received no distributions from the trust. NC attempted to tax the trust's entire income based solely on her state residency.

The Court held this violated the Due Process Clause of the Fourteenth Amendment. Taxing authority requires a "minimum connection" between the state and the thing it taxes. Where a beneficiary exercises no control over trust assets and has received nothing from the trust, the state has no constitutional basis to tax the trust's income on her behalf.

What Kaestner does NOT protect against:

• A state taxing distributions actually received by a resident beneficiary — states can always tax their residents on income received
• A state taxing based on a resident trustee, resident trust administration, or the settlor's prior domicile
• California's partial-nexus approach, which apportions trust income based on beneficiary residence rather than taxing 100% on that basis alone

State profiles: where successor trustees get surprised

California

California taxes trusts under Revenue & Taxation Code §§ 17742–17745 based on the residency of trustees and beneficiaries. The rules for successor trustees:

• Resident trustee = worldwide trust income: If you are a California resident serving as successor trustee, California asserts taxing authority over the trust's worldwide income — even if the trust was created in Nevada, Texas, or Florida and holds no California assets.
• Partial CA trustee = prorated income: If two co-trustees serve and one is a California resident, California taxes 50% of trust income. The proration is based on the fraction of California-resident trustees (RTC § 17743).
• Beneficiary residence adds another layer: California also attempts to tax income based on resident beneficiaries' shares (RTC § 17744), subject to Kaestner limits on undistributed income.
• Rates: California applies its individual income tax rate schedule to trust income, starting at 1% and reaching 12.3% above approximately $721,314 of taxable income, plus a 1% Mental Health Services Tax on income over $1 million (13.3% combined top rate). For trust income in the $100K–$300K range, the effective California marginal rate typically runs 9.3%–10.3%.

New York

New York taxes resident trusts — those created by a New York domiciliary or arising from a New York testamentary estate. The top New York rate is 10.9% (at the highest income levels); for most trust income ranges, the effective New York rate runs 6.85%–10.3%.

New York offers an Exempt Resident Trust exception. A trust that would otherwise be a NY resident trust avoids New York income tax entirely if all three conditions are met each year:

1. All trustees are domiciled outside New York State
2. All trust property (corpus) is located and administered outside New York
3. All income and gains derive from sources outside New York

This three-part test is applied annually. New York also scrutinizes trust advisors and investment managers who are NY residents — if their role gives them trustee-like powers, New York may treat them as co-trustees and destroy prong 1, making the trust fully taxable in New York. Passing the exempt-trust test requires more than simply appointing an out-of-state corporate trustee. ²

Minnesota

Minnesota has historically taxed trusts created by Minnesota residents (settlor-domicile theory) even when neither the current trustee nor the beneficiaries still live in Minnesota. The Minnesota Supreme Court narrowed this approach in Fielding v. Commissioner of Revenue (2020), striking down its application to trusts with no current Minnesota contacts and requiring a facts-and-circumstances analysis: current trustee residency, asset location, administration location, and beneficiary residency all weigh in. Minnesota's top individual income tax rate is 9.85%.

Oregon and New Jersey

Oregon imposes a top income tax rate of 9.9% and taxes trusts based on trustee residence and trust administration location. New Jersey's top rate is 10.75% on income above $1 million. Both follow nexus rules similar to California's trustee-residence approach.

Combined federal-plus-state marginal rates

These are marginal rates on ordinary income at the top of each state's schedule. State income taxes paid by the trust are deductible on Form 1041 (IRC § 164), reducing the after-tax state cost by the trust's federal marginal rate (37%). Even after the deduction, the net state income tax burden in California for a trust in the 9.3% bracket is approximately 9.3% × (1 − 0.37) = 5.9% of trust income — a meaningful drag on returns over a multi-year administration.

Four strategies to reduce state trust income tax

1. Distribute income to lower-tax beneficiaries

When the trust distributes income to beneficiaries, it deducts the distributed amount up to Distributable Net Income (DNI) from its taxable income. The beneficiary reports the income on their personal return at their own rate. If a beneficiary lives in a no-income-tax state — Florida, Texas, Washington — distributing income shifts the tax from the trust (which pays both federal compressed-bracket tax and state trust tax) to a beneficiary who may owe only federal income tax at a lower individual bracket rate, and zero state income tax.

This is often the simplest, highest-impact strategy for trusts with discretionary distribution authority. Use the trust distribution calculator to model the federal tax impact, and ask your CPA to overlay the state tax effect. See also the trust distribution decisions guide for the HEMS standard and documentation requirements.

2. Change the trustee to a non-resident trustee

In states where trustee residence is the primary nexus hook — especially California — the most direct solution is changing the trustee. Replacing a California-resident individual trustee with a corporate trustee headquartered in Nevada, Wyoming, or South Dakota eliminates California's primary basis for taxing the trust, assuming no remaining California-resident co-trustees and no California-source income (rent from CA real estate, for example, remains CA-taxable regardless).

Changing the trustee must follow the trust document's succession provisions or a nonjudicial settlement agreement under UTC § 111, and may require a court petition in some states. See the irrevocable trust modification guide for the available legal mechanisms.

3. Change trust situs to a no-income-tax state

The trust's governing law and primary administration location can often be moved to Wyoming, South Dakota, Nevada, Florida, or Washington — states with no income tax and favorable directed-trust statutes. South Dakota and Wyoming are particularly common destinations: no state income tax, strong asset protection laws, and statutes that permit separation of investment and distribution duties between different fiduciaries.

A situs change typically requires authority in the trust document to change governing law, action by the trust protector (if one exists), or a court petition. See the trust protector guide — many trust protectors hold the power to change situs without court approval.

4. Trust decanting

Decanting transfers trust assets from an existing trust into a new trust with different terms — including a governing-law provision subjecting the new trust to a no-income-tax state's rules. If the original trust gives the trustee broad distribution authority (or state law authorizes decanting), a distribution to a new trust can effectively accomplish a situs change even when the old trust document doesn't expressly permit it.

Decanting has income tax, gift tax, and GST consequences and must be structured carefully with estate counsel. It is best suited to trusts where the long-term state tax savings are large enough to justify the legal cost — generally trusts with $1M+ in annual income operating over a 10+ year horizon.

When these rules apply

These strategies apply to non-grantor irrevocable trusts — what most revocable living trusts become when the settlor dies. Grantor trusts (including a revocable trust while the settlor is alive) are taxed on the grantor's personal return, so the grantor's own state residency controls. See settlor incapacity administration for how grantor trust rules work during the period before death.

States without income tax (Florida, Texas, Wyoming, South Dakota, Nevada, Washington, Alaska) impose no state-level trust income tax at all. If your trust has no connection to a high-tax state — no CA-resident trustee, no NY-created trust, no Oregon administration — state income tax is not a material planning issue.

What to ask your CPA

Every successor trustee administering a trust with material income should have the state filing obligations reviewed by a CPA who handles fiduciary income taxation. The key questions:

• In which states is this trust required to file income tax returns?
• Is the trust paying tax in any state unnecessarily given our trustee and beneficiary locations?
• Would distributing income to beneficiaries meaningfully reduce total combined income tax?
• Is a trustee change, situs change, or decanting worth modeling given the trust's expected income and timeline?

A fee-only financial advisor specializing in trust administration can model the after-tax economics of distribution decisions and work alongside the CPA to execute the most efficient strategy — without the conflict that exists when the advisor earns commissions on the investments they manage.