What Is a Common Law Trust and How Does It Work?

A common law trust is a legal arrangement, shaped by centuries of court decisions rather than a single statute, in which one person (the trustee) holds legal title to property and manages it for the benefit of someone else (the beneficiary). The person who creates it (the settlor) sets the rules. That split between legal ownership and the right to benefit is what gives a trust its usefulness in estate planning, asset management, and family wealth transfers, and it is also what creates the duties and tax consequences you need to understand before setting one up.

Where the Rules Come From

“Common law” points to the source of the law, not a particular type of trust. Most trust doctrine developed through court rulings and legal treatises like the Restatement of Trusts rather than through legislation. There is no uniform federal trust statute. Roughly three dozen states have adopted some version of the Uniform Trust Code, but the foundational principles still trace back to judicial precedent.¹

Practically, this means the law governing your trust depends on where you live. A structure that works cleanly in one state may run into friction in another. The IRS has its own definitions for federal tax purposes, but those layer on top of state law rather than replacing it.

When people talk about “setting up a trust,” they almost always mean an express trust, one that the settlor deliberately creates. Courts can impose other kinds of trusts (constructive and resulting trusts) as remedies, but those are judicial creations, not planning tools.

The Five Elements a Trust Must Have

Remove any one of these and a court is likely to find that no valid trust exists.¹

A settlor (sometimes called a grantor) who creates the trust, contributes property, and sets the terms.
A trustee who takes legal title to the property and manages it. The trustee is the owner on paper but cannot use the property for personal benefit, and owes the beneficiaries fiduciary duties of loyalty and care.
A beneficiary entitled to the use and value of the trust property. The beneficiary is sometimes called the equitable owner and can go to court to force an accounting or remove a trustee who mismanages the assets.
Identifiable trust property. Without assets actually transferred in, there is no trust. The property can be almost anything of value: real estate, bank accounts, investments, business interests.
A lawful purpose. A trust designed to hide assets from a known creditor in an active lawsuit, for example, can be voided as fraudulent.

Creating and Funding One

The key legal ingredient is intent. The settlor must actually mean to impose a duty on someone to hold and manage property for another person’s benefit. Using the word “trust” is not required, and using it does not by itself prove intent. Courts look at the substance of the arrangement.¹

A trust involving only personal property can technically be oral in many states, but proving it exists later is difficult and expensive. For real estate, the Statute of Frauds in most states requires a written document. Testamentary trusts, created inside a will, must be in writing because the will itself must be. In practice, almost every trust worth creating has a written instrument that lays out the trustee’s powers, the beneficiaries’ rights, distribution schedules, and what happens if the trustee dies or becomes incapacitated.

A signed trust document sitting in a drawer does nothing on its own. The settlor must actually move the assets. Bank accounts get retitled. Real estate requires a new deed, executed and recorded. Investment accounts need to be re-registered with the brokerage. The settlor can also declare that property they already own is now held in trust without transferring it to a separate trustee, but this self-declaration approach is less common outside charitable trusts.¹

Revocable or Irrevocable

This single choice shapes almost everything else about how the trust works.

A revocable trust lets the settlor change the terms, swap beneficiaries, or dissolve the trust entirely at any time. Most living trusts used in everyday estate planning are revocable. The tradeoff: you keep control, but for tax and creditor purposes, the assets are still treated as yours. The IRS classifies every revocable trust as a “grantor trust,” meaning the trust’s income flows through to the settlor’s personal tax return as if the trust did not exist.²

An irrevocable trust, once created and funded, generally cannot be changed or revoked by the settlor. The settlor gives up ownership and control. In exchange, the property is typically outside the settlor’s taxable estate and beyond the reach of the settlor’s personal creditors. If the settlor keeps a power to revoke the trust or reclaim property, the IRS will treat it as a grantor trust regardless of what the document calls it.³

What the Trustee Actually Has to Do

The trustee runs the trust under its terms and in the beneficiaries’ interests. This is where fiduciary duty becomes more than a phrase. A trustee who treats trust property casually, favors one beneficiary over another, or mixes trust funds with personal money is exposed to real legal consequences.

Core Duties

The duty of loyalty requires the trustee to administer the trust solely for the beneficiaries’ benefit, with no self-dealing. A trustee who buys trust property for themselves at a below-market price has violated this duty even if the trust comes out ahead on paper. The duty of prudence holds the trustee to an objective standard of care. The duty of impartiality requires fair treatment of all beneficiaries, which gets complicated when a trust has both current income beneficiaries and remainder beneficiaries who take whatever is left when the trust ends.

Investing the Property

The Uniform Prudent Investor Act, adopted in most states, requires trustees to evaluate investments in the context of the overall portfolio rather than judging each holding in isolation. The Act emphasizes diversification and total return. A trustee who puts everything into a single stock, no matter how blue-chip, is likely violating this standard.

Reporting to Beneficiaries

Beneficiaries have the right to know what is happening with the trust. Trustees must keep qualified beneficiaries reasonably informed and provide accountings, typically at least annually, showing what the trust owns, what income it earned, what expenses were paid, and what distributions went out. A trustee who stonewalls information requests is breaching a duty, and beneficiaries can petition a court to compel disclosure or to remove the trustee.

Getting Paid

Trustees are entitled to reasonable compensation. The trust document often spells out the fee. When it doesn’t, courts weigh the value and complexity of the property, the time spent, the trustee’s skill, and the results. Professional and corporate trustees typically charge an annual percentage of assets under management. Family members serving as trustee may charge less or nothing, though they have every right to be paid for what can be demanding work.

How a Trust Is Taxed

A trust is not a tax shelter. Depending on its structure, a trust either passes its tax burden through to the settlor, passes it through to the beneficiaries, or pays tax itself at rates that climb fast.

Every revocable trust is a grantor trust. An irrevocable trust can also be a grantor trust if it triggers any of the rules in IRC Sections 671 through 677.⁴ A grantor trust generally doesn’t file its own return if the settlor reports all its income and deductions on their personal Form 1040.²

When the trust is a separate taxpayer, it files Form 1041 and pays tax on income it keeps. A trust must file Form 1041 if it has any taxable income, or gross income of $600 or more regardless of taxable income. For calendar-year trusts, the deadline is April 15.⁵

Here is the part that surprises people. Trust tax brackets are severely compressed. For the 2025 tax year, trust income above just $15,650 hits the top federal rate of 37%. An individual does not reach that rate until income exceeds roughly $626,000. The trust gets to deduct distributions to beneficiaries, so income flowing out is taxed on the beneficiaries’ returns at their rates. Keeping income inside the trust is often the most expensive option.

Creditor Protection and Its Limits

Asset protection is one of the main reasons people set up trusts. How well it works depends on structure and who the creditor is.

A spendthrift provision restricts a beneficiary’s ability to transfer their interest and blocks most creditors from reaching trust assets before they are distributed. Once a distribution lands in the beneficiary’s bank account, creditors can go after it, but they generally cannot force the trustee to make distributions in the first place. Spendthrift clauses are widely recognized, with important exceptions. Courts in most states allow child support and spousal support claimants to reach trust assets despite the clause, and government claims, including tax debts, can also typically pierce it.

If the settlor is also a beneficiary, the picture changes. In the vast majority of states, you cannot create a trust for your own benefit and shield those assets from your creditors. A handful of states allow self-settled asset protection trusts, but even there, waiting periods apply, and fraudulent transfer laws can unwind the arrangement if the settlor was already in financial trouble when the trust was funded.

“Pure Trust” and Tax Elimination Pitches

Anyone researching trusts online will eventually run into promoters selling “pure trusts,” “constitutional trusts,” or “common law trusts” as vehicles to eliminate income tax, hide assets from the IRS, or dodge estate tax. These do not work. The IRS has stated that the term “pure trust” does not appear anywhere in the Internal Revenue Code. Whatever name is on the arrangement, the IRS taxes it based on economic reality. If it meets the definition of a trust, it is taxed under the normal trust rules. If the settlor keeps control, it is a grantor trust and all the income is taxed to the settlor.⁶

The usual pitch involves stacking layers of trusts, recharacterizing personal expenses as business deductions, and claiming the trust’s income is somehow not taxable. The promoter charges thousands in fees. The taxpayer ends up owing back taxes, penalties, and interest when the IRS catches up, and in serious cases criminal tax evasion charges follow. If a seller claims a common law trust can make your income invisible to the IRS, walk away.²

How Trusts End

A revocable trust ends when the settlor says so. The settlor can revoke it, pull the property back, and move on. Most revocable living trusts are designed to become irrevocable at the settlor’s death, at which point the trustee distributes assets under the trust’s terms. This is the mechanism that lets trust property skip probate, since the trust, not the deceased, owns the assets.

Irrevocable trusts are harder to unwind. The document usually specifies the end point: a beneficiary reaching a given age, the property running out, or a set number of years passing. If all beneficiaries agree the trust no longer serves its purpose, they can petition a court for early termination in many states, though courts will refuse if ending the trust would defeat a purpose the settlor considered important. A court can also authorize the trustee to close out a trust whose remaining property has become too small to justify the cost of administration.

1
Internal Revenue Service. Exempt Organizations-Technical Instruction Program for FY 2003 – Trusts: Common Law and IRC 501(c)(3) and 4947
2
Internal Revenue Service. Abusive Trust Tax Evasion Schemes – Questions and Answers
3
Office of the Law Revision Counsel. 26 USC 676 – Power to Revoke
4
Office of the Law Revision Counsel. 26 USC 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners
5
Internal Revenue Service. Instructions for Form 1041
6
Internal Revenue Service. Abusive Trust Tax Evasion Schemes – Special Types of Trusts