An inter vivos trust is a trust created during the lifetime of the settlor, the person who creates it, so it exists and operates while that person is still alive. It stands opposite a testamentary trust, which is a trust created in a will that begins upon the death of the testator, the person who made that will (Legal Information Institute, inter vivos trust).
That split is built into how the tax law defines the word. The term trust as used in the Internal Revenue Code refers to an arrangement created either by a will or by an inter vivos declaration whereby trustees take title to property for the purpose of protecting or conserving it for the beneficiaries under the ordinary rules applied in chancery or probate courts (section 301.7701-4(a)). The will and the inter vivos declaration are the two routes in, and they are the whole of the timing question.
Living trust is the everyday name for the same thing, and the IRS defines the revocable branch of it directly. A revocable living trust is an arrangement created by a written agreement or declaration during the life of an individual that can be changed or ended at any time during that individual’s life, generally created to manage and distribute property, and many people use it instead of or in addition to a will (IRS, Instructions for Form 1041 (2025)).
Inter Vivos Versus Testamentary Is a Different Question From Revocable Versus Irrevocable
These are two axes, and answering one settles nothing about the other. An inter vivos trust can be revocable or irrevocable: a revocable inter vivos trust allows the settlor to cancel or amend the trust whenever the settlor desires, while an irrevocable inter vivos trust cannot be altered after the trust is signed and cannot return assets to the settlor once the settlor has transferred assets into it (Legal Information Institute, inter vivos trust).
So the first axis tells you when the trust came into existence. The second tells you whether the settlor kept the power to undo it. The second one is what decides where the income gets reported.
Where the Trust’s Income Gets Reported
Not on the trust’s own return, in the ordinary living-trust case. The instructions say why: because this type of trust is revocable, it is treated as a grantor type trust for tax purposes (IRS, Instructions for Form 1041 (2025)).
The power to revoke is what does it. The grantor is treated as the owner of any portion of a trust, whether or not treated as such owner under any other provision of that part, where at any time the power to revest in the grantor title to that portion is exercisable by the grantor or a non-adverse party, or both (26 U.S.C. 676(a)).
The statute’s two terms of art are defined a few sections earlier. A nonadverse party means any person who is not an adverse party, and an adverse party means any person having a substantial beneficial interest in the trust which would be adversely affected by the exercise or nonexercise of the power which he possesses respecting the trust (26 U.S.C. 672(a) and (b)).
Ownership then pulls the numbers onto the owner’s own return. Where the grantor or another person is treated as the owner of any portion of a trust, the items of income, deductions and credits of the trust attributable to that portion are included in computing the taxable income and credits of that person (26 U.S.C. 671).
The reporting mechanics follow from that. Items attributable to a portion of a trust treated as owned by the grantor or another person are not reported by the trust on Form 1041 but are shown on a separate statement attached to that form (26 CFR 1.671-4(a)). Where all of the trust is treated as owned by one or more grantors or other persons, and the trust is not one of the excluded kinds, the trustee may, but is not required to, report by one of the optional methods instead (26 CFR 1.671-4(b)(1)).
The lightest of those methods files nothing at all. Where the trustee furnishes the name and taxpayer identification number of the grantor and the address of the trust to all payors, and gives the grantor the required statement of the trust’s items, the trustee is not required to file any type of return with the Internal Revenue Service (26 CFR 1.671-4(b)(2)(ii)(B)).
A trust that is not a grantor trust files in its own right, and the trust threshold is not the estate threshold. The fiduciary, meaning the trustee of the trust, must file Form 1041 for a domestic trust taxable under section 641 that has any taxable income for the tax year, gross income of $600 or more regardless of taxable income, or a beneficiary who is a nonresident alien, and a trust that held a qualified investment in a qualified opportunity fund at any time during the year must file with Form 8997 attached (IRS, Instructions for Form 1041 (2025)).
When the Trust Needs Its Own EIN
When it has to file. Every estate or trust that is required to file Form 1041 must have an EIN (IRS, Instructions for Form 1041 (2025)).
The common living-trust case is the exception. Grantor trusts that have not applied for an EIN and are going to file under Optional Method 1 do not need an EIN for the trust as long as they continue to report under that method (IRS, Instructions for Form 1041 (2025)).
What Changes When the Settlor Dies
The trust’s taxpayer identification number changes first. All qualified revocable trusts must obtain a new taxpayer identification number following the death of the decedent, whether or not a section 645 election is made, and a qualified revocable trust is in general any trust, or part of a trust, that on the day the decedent died was treated as owned by the decedent because the decedent held the power to revoke it as described in section 676 (IRS, Instructions for Form 1041 (2025)).
Then the trust can be folded into the estate for a while. If both the executor of the related estate and the trustee of a qualified revocable trust elect the treatment in section 645, the trust is treated and taxed as part of the related estate during the election period, the election is made on Form 8855, and once made it is irrevocable (IRS, Instructions for Form 1041 (2025)).
Avoiding Probate Is Not Leaving the Gross Estate
Probate and the gross estate get run together, and they are separate systems. An inter vivos trust is a legitimate means for the settlor’s estate to avoid probate administration (Legal Information Institute, inter vivos trust).
That is a probate result, and it does not travel to the estate tax. The gross estate includes the value of all property, to the extent of any interest in it, that the decedent at any time transferred, by trust or otherwise, other than in a bona fide sale for adequate and full consideration in money or money’s worth, where the enjoyment of the property was subject at the date of death to any change through the exercise of a power, in whatever capacity exercisable, by the decedent alone or with any other person, to alter, amend, revoke or terminate (26 U.S.C. 2038(a)(1)). A trust the settlor could still revoke on the day they died answers that description.
What the estate then takes as basis is a separate rule, worked through in step-up basis. Where the settlor kept possession or the right to the income rather than the power to revoke, the analysis runs on the retained interest instead, covered in life estate. A transfer that takes effect only at death, through a will or a trust, is a bequest.
Common Questions
Privacy and lifetime management. An inter vivos trust is a means of protecting a settlor’s privacy and a method for them to manage assets later in life, though the benefits and costs of one differ according to individual circumstances (Legal Information Institute, inter vivos trust).
The irrevocable version gives up control permanently. There is also a formality trap: an inter vivos trust can be created orally or in writing, but oral inter vivos trusts may not be accepted by certain jurisdictions and must always comply with the statute of frauds (Legal Information Institute, inter vivos trust).
The revocable version has a different limit, and it is a tax one. While the settlor holds the power to revoke, the income keeps landing on the settlor’s own return.
That grouping is not a tax-law category. The regulation that classifies trusts for Code purposes separates ordinary trusts from business trusts, certain investment trusts, liquidating trusts and environmental remediation trusts, and an arrangement only gets ordinary trust treatment where its purpose is to vest in trustees responsibility for protecting and conserving property for beneficiaries who cannot share in that responsibility (section 301.7701-4).
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