A state can tax a trust only when it has a legal connection called nexus, and trust nexus for state tax purposes generally comes from one of five things: where the grantor lived when the trust became irrevocable, where the trustee lives, where the trust is administered, where the beneficiaries live, or where the trust’s assets are located. Any one of these can be enough on its own in some states, and a single trust can easily satisfy the tests in two or three states at the same time. The result is a real risk of overlapping tax bills on the same undistributed income, and a trustee who misjudges which states have a claim can end up owing back taxes, interest, and penalties across multiple years.
The Five Connections States Use
States generally group their nexus rules into three families. Some focus on the grantor, treating a trust as a resident if the person who created it was domiciled in the state when the trust became irrevocable or when they died. Others look at where the trustee lives or where the trust is actually managed day to day. A third group examines administration itself: where records are kept, where investment decisions are made, where tax returns are prepared.1Multistate Tax Commission. Residence Factors for Irrevocable Inter Vivos Trusts Many states combine two or more of these factors. A handful impose no income tax on trusts at all.
Beneficiary residence and asset location sit alongside these residency tests. Even a trust that is not a resident anywhere can owe tax to a state where it earns source income, and a state where a beneficiary lives may claim tax on that beneficiary’s share of the income in some circumstances. The same trust can therefore be a resident in one state, a nonresident taxpayer in another because it owns rental property there, and a source of taxable distributions in a third because a beneficiary has moved.
Grantor Domicile and Its Limits
A large group of states, concentrated on the East Coast and in the Midwest, classifies a trust as a resident based entirely on where the grantor lived. If the grantor was domiciled in the state when the trust became irrevocable, or at death for a testamentary trust, the trust is treated as a resident. New York, New Jersey, Illinois, Connecticut, Michigan, and Missouri all follow some version of this rule.1Multistate Tax Commission. Residence Factors for Irrevocable Inter Vivos Trusts
What makes this approach aggressive is its permanence. Once the classification attaches based on the grantor’s domicile at a single moment, it can persist for decades. It does not matter if the trustee later moves, the beneficiaries scatter, or every asset ends up invested elsewhere. The state’s theory is that the trust owes its legal existence to the grantor’s use of that state’s laws.
Two recent decisions have pushed back on that theory. In Linn v. Department of Revenue (2013), an Illinois appellate court rejected the state’s attempt to tax a trust indefinitely on grantor domicile alone, holding that when a trust had no resident beneficiaries, no resident trustee, no in-state assets, and no in-state administration during the tax years at issue, the historical connection was too thin to satisfy due process. The Minnesota Supreme Court reached a similar conclusion in Fielding v. Commissioner (2018), finding the grantor’s domicile was not a connection “of sufficient substance” when the trust lacked contemporaneous ties during the tax year.
Courts are trending toward disallowing perpetual grantor-based nexus, but there is no uniform rule. Trustees in grantor-domicile states should be cautious about simply stopping filings without weighing audit and litigation risks first, especially where the trust’s facts do not match existing case law closely.
Trustee Location and Place of Administration
A trustee who lives or works in a state gives that state a direct jurisdictional hook. The trustee uses local courts, relies on local contract law, and conducts trust business from a local office. Arizona and Hawaii, for example, define a trust as a resident if the fiduciary resides in the state.1Multistate Tax Commission. Residence Factors for Irrevocable Inter Vivos Trusts Others, including Colorado and Kansas, focus on where the trust is “administered,” which usually means where day-to-day decisions are made, records are kept, and returns are prepared.
The distinction matters when trustee residence and administration are in different states. A corporate trustee headquartered in one state may keep records and make investment decisions from an office in another. Some states define “administration” precisely to resolve the ambiguity. Idaho’s regulations include conducting trust business, investing assets, making administrative decisions, and preparing tax returns. Iowa looks at where evidence of intangible assets is kept, alongside where the trustees reside and where the principal office operates.
Co-trustees in different states complicate the picture. California taxes a trust on a pro-rata basis according to how many of its fiduciaries are residents. If a trust has two co-trustees and one lives in California, the state may tax half the income. Adding or removing a co-trustee can directly change exposure. Appointing a successor trustee in a different state can also shift nexus, as the Minnesota Supreme Court recognized in Fielding, where appointment of a sole trustee domiciled in Texas was a factor in finding insufficient Minnesota connections.
Beneficiary Residence After Kaestner
Some states tax trust income based on where the beneficiaries live, even when the trustee and assets are entirely elsewhere. The U.S. Supreme Court placed a significant constitutional limit on this in North Carolina Department of Revenue v. Kimberley Rice Kaestner 1992 Family Trust (2019), holding that “the presence of in-state beneficiaries alone does not empower a State to tax trust income that has not been distributed to the beneficiaries where the beneficiaries have no right to demand that income and are uncertain ever to receive it.”2Supreme Court of the United States. North Carolina Dept. of Revenue v. Kimberley Rice Kaestner 1992 Family Trust A state cannot tax accumulated trust income just because a contingent beneficiary happens to live there.
Kaestner does not shut down all beneficiary-based taxation. When a beneficiary has a present right to receive distributions, has actually received income, or exercises meaningful control over trust property, the state’s claim is much stronger. The Court described a “pragmatic inquiry” into what the beneficiary actually controls or possesses and how that interest relates to what the state is trying to tax. A beneficiary receiving regular distributions is a different situation from one holding only a contingent future interest.
Trustees should document beneficiary residency each year. A beneficiary who moves into a taxing state, or whose interest shifts from contingent to vested, can create new filing obligations for the trust.
Asset Location and Source Income
Wherever the people connected to a trust live, income tied to physical assets in a state is almost always taxable there. Rental income from real property, gains from selling land or buildings, and profits from a business operating in the state all create source income the state can tax. Business income flowing through a partnership or LLC held by the trust adds another layer. When the business operates in multiple states, the trust may need to apportion its share of profits using formulas weighing sales, payroll, and property location. States routinely use federal Schedule K-1s to verify that trusts are reporting their local share correctly.
Trusts earning source income in states where they are not residents often face nonresident withholding. The entity paying the income withholds a percentage and remits it to the state before the trust receives anything. These requirements vary but are common enough that any trust holding real property or business interests across state lines should expect them.
Intangible Assets
Income from stocks, bonds, and similar intangible assets is treated differently. Under the traditional rule of mobilia sequuntur personam (movables follow the person), intangible property is taxed at the domicile of its owner, which for a trust means the state where it is a resident.3Cornell Law School. US Constitution Annotated – Intangible Personalty Courts recognize an exception when intangible property acquires a “business situs” elsewhere, such as stocks used as working capital in a business located in another state. But for most trusts holding a diversified portfolio managed by a financial advisor, intangible income follows the trust’s residence, not the physical location of the brokerage account.
Nonresident trusts are generally taxable only on undistributed income sourced to a particular state. Intangible income usually is not sourced to a state the way rental income from a building is, so a nonresident trust with publicly traded stocks generally has no filing obligation in the state where the brokerage firm happens to be located.
Constitutional Limits on State Reach
Two provisions of the U.S. Constitution constrain how far a state can push: the Due Process Clause of the Fourteenth Amendment and the Commerce Clause.
Due Process
Due process requires a minimum connection between the state and the trust it wants to tax, and it requires that the income the state is reaching be rationally related to the protections and benefits the state actually provides.4ACTEC Foundation. The Kaestner Trust Case – Due Process and State Taxation of Non-Resident Trustees Courts examine what happened during the specific tax year, not historical connections that have faded.
Kaestner is the most important recent application to trusts. The Court held that when a state taxes based on a beneficiary’s residence, the Constitution requires the beneficiary have “some degree of possession, control, or enjoyment of the trust property or a right to receive that property.”2Supreme Court of the United States. North Carolina Dept. of Revenue v. Kimberley Rice Kaestner 1992 Family Trust Without that, the state’s relationship to the income is “too attenuated.” The Minnesota Supreme Court applied similar reasoning in Fielding, finding the trust’s contacts with Minnesota during 2014 “extremely tenuous”: no trustee contact during the year, all administration elsewhere, no in-state property, and all intangibles held outside the state.
Commerce Clause
The Commerce Clause adds a separate constraint. Under Complete Auto Transit, Inc. v. Brady, a state tax on interstate activity must satisfy four requirements, including substantial nexus and fair apportionment.5Constitution Annotated. Apportionment Prong of Complete Auto Test for Taxes on Interstate Commerce Fair apportionment is where most trust disputes arise. A state tax must be structured so that if every state imposed an identical tax, no income would be taxed twice.6Cornell Law School. US Constitution Annotated – State Taxation and the Dormant Commerce Clause A fiduciary facing overlapping full-tax claims from two states has strong grounds to challenge at least one of them.
Handling Overlapping Claims
When a trust is taxed as a resident in one state and also owes source-income tax to another, the standard relief is a credit for taxes paid to the other state. Most states allow a resident trust to offset its home-state liability by the amount it paid to a nonresident state on the same income. The credit is generally limited to the smaller of the tax actually paid to the other state or the resident state’s own tax on that income under its own sourcing rules.
Complications come up regularly. The credit only applies to income both states are taxing, so if the resident state treats certain intangible income as locally sourced while the nonresident state does not, no credit may be available for that portion. Most states require the trust to add back any state income taxes deducted on its federal return before calculating the credit. And whether a beneficiary can claim a credit for taxes the trust paid varies by state. Trusts treated as residents in two states simultaneously face the hardest problems, and some states have specific formulas to split the burden proportionally.
Changing the Trust’s Situs
Because nexus often turns on where the trustee lives or where administration occurs, changing those facts can sometimes change exposure. Appointing a successor trustee in a state with no income tax or a more favorable regime is the most direct approach. When all administration moves with the new trustee, states basing residency on trustee location or place of administration may lose their claim.
Decanting offers another path. A trustee with decanting authority can distribute an existing trust’s assets into a newly created trust in a different state, effectively creating a new legal entity with a new taxpayer identification number and potentially a new situs. Filing a final fiduciary return for the original trust and obtaining a separate ID for the new one helps document the change. Avoiding large asset sales during the year of transfer reduces what the departing state can claim.
Neither strategy is risk-free. States basing residency on grantor domicile may continue claiming the trust regardless of where the trustee moves. And a trust that changes trustees on paper but keeps its records, accountants, and investment advisors in the original state is unlikely to convince an auditor that administration has genuinely relocated.
Filing Obligations and What Late Filings Cost
At the federal level, the fiduciary of a domestic trust uses Form 1041 to report income, deductions, gains, losses, distributions to beneficiaries, and any tax the trust itself owes.7Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 State fiduciary requirements are separate and vary widely. Most states require a return when the trust is classified as a resident under that state’s rules, or when it earns source income above a minimal threshold.
Federal failure-to-file penalties run 5% of the unpaid tax for each month the return is late, up to 25%.8Internal Revenue Service. Failure to File Penalty For returns due after December 31, 2025, the minimum penalty is $525 or 100% of the unpaid tax, whichever is less. State penalties vary; flat fees of $50 to $250 plus percentage penalties of 2% to 25% of unpaid tax are common, with interest on top.
The bigger risk is often not the penalty itself but the discovery of years of missed filings. A trust that should have been filing in a state but was not may owe back taxes plus compounding interest and penalties for every missed year. Some states have no statute of limitations on unfiled returns and can go back indefinitely. Any trustee who inherits responsibility for an existing trust should review its filing history in every state where nexus might exist before assuming everything is current.