What is a Trust in Estate Planning?
A trust is the legal instrument for holding and passing on assets. How revocable and irrevocable trusts differ, how they avoid probate, and when to use one.

A trust is a legal arrangement in which one party, the trustee, holds and manages assets on behalf of another, the beneficiary, according to terms set by the person who created it. Trusts are a core estate planning tool because they let you control how and when assets pass to others, often while avoiding probate.
The grantor (also called the settlor) creates the trust and funds it. The trustee manages the assets and is bound by fiduciary duty to follow the trust’s terms. The beneficiary receives the benefit. One person can occupy more than one role, which is why a revocable living trust typically names its creator as both grantor and trustee during their lifetime.
Revocable vs. Irrevocable Trusts
A trust is either revocable or irrevocable, depending on whether it can be changed after it is created.
A revocable trust can be amended or dissolved by the grantor at any time. Because the grantor retains control, the assets are still considered theirs for tax and creditor purposes. Revocable trusts avoid probate and provide privacy, but they do not reduce estate taxes or shield assets from creditors.
An irrevocable trust generally cannot be modified once established without beneficiary consent or court approval. Giving up that control is the point: a properly structured irrevocable trust can remove assets from the grantor’s taxable estate and may protect them from creditors, though both depend on which powers and benefits the grantor keeps. The tradeoff is permanence, and there are tax costs too: the transfer is generally a gift that counts against the same lifetime exclusion, and assets outside your estate generally don’t receive a step-up in basis at death.
| Revocable | Irrevocable | |
|---|---|---|
| Can be changed | Yes, any time | Generally no |
| Avoids probate | Yes, for assets titled in the trust during the grantor’s lifetime | Yes, for assets titled in the trust during the grantor’s lifetime |
| Reduces estate tax | No | Can, if properly structured; assets removed from the estate generally lose the step-up in basis |
| Creditor protection | No | When properly structured |
| Who controls assets | Grantor | Trustee, per trust terms |
Common Types of Trusts
Living trusts are created during the grantor’s lifetime, as opposed to testamentary trusts, which are established by a will and only take effect at death. A testamentary trust does not avoid probate, since the will itself must be probated first.
Special needs trusts provide for a beneficiary with a disability without disqualifying them from means-tested benefits such as Medicaid or Supplemental Security Income. A direct inheritance can end that eligibility; a properly drafted special needs trust does not.
Charitable trusts direct assets to a charitable purpose, sometimes while providing income to the grantor or another beneficiary for a period first.
Spendthrift trusts limit a beneficiary’s ability to access principal directly, which protects the assets from both the beneficiary’s creditors and their own decisions.
What Trusts Actually Accomplish
The first benefit is probate avoidance. Assets held in a trust pass directly to beneficiaries under its terms rather than going through the court process, which saves time and keeps the distribution private. Probate is a public proceeding; a trust is not.
The second is control over timing and conditions. A will usually distributes assets outright. A trust can hold them and release them on a schedule, at certain ages, or subject to conditions, which is why trusts are common where beneficiaries are young or where the grantor wants to protect an inheritance from being spent quickly.
Estate tax reduction applies to a narrower group. For 2026, the federal estate tax basic exclusion amount is $15,000,000 per person, and a married couple can combine their exclusions if the estate of the first spouse to die elects portability on a timely filed estate tax return. Below that threshold, a trust is about probate, privacy, and control rather than federal estate tax. Some states levy their own estate or inheritance taxes at much lower thresholds (Oregon requires an estate tax return at $1 million, Massachusetts above $2 million), so the calculation depends on where you live. Because both federal and state thresholds change, confirm current figures when planning.
Setting One Up
A trust that is never funded does nothing, so after signing the trust document you also have to retitle accounts and property into the trust’s name. Assets left outside it still go through probate.
The other decisions that matter are choosing a trustee who will actually be able to serve, drafting terms specific enough to be administrable, and coordinating the trust with the rest of your estate plan so a will and beneficiary designations do not contradict it. Beneficiary designations on retirement accounts and life insurance override what a will or trust says.
Trusts are one component of an estate plan rather than the whole of it, and their value depends on how they interact with projected estate value, tax exposure, and what beneficiaries actually receive.
Tip
You can model your full estate in ProjectionLab to project net legacy and estate tax exposure.
Trust law is state-specific and the drafting details carry real consequences, so this is an area where working with an estate planning attorney is genuinely warranted.
Frequently Asked Questions
What is the difference between a trust and a will? A will directs how assets are distributed after death and must go through probate. A trust holds assets during your lifetime and after, passes them outside probate, and can control the timing of distributions. Many estate plans use both.
Do I need a trust if I already have a will? Not necessarily. A trust is most useful if you want to avoid probate, own property in multiple states, want privacy, or need to control distributions over time. A straightforward estate with named beneficiaries on the major accounts may be adequately served by a will.
Does a trust avoid estate taxes? A revocable trust does not. Certain irrevocable trusts can remove assets from your taxable estate. Federal estate tax applies only above the basic exclusion amount, which is $15,000,000 per person for 2026. Moving assets out of your estate generally means giving up the step-up in basis, so below that threshold it can raise taxes for your heirs.
Who should be the trustee? Someone capable of administering assets impartially and willing to take on the responsibility. You can serve as trustee of your own revocable living trust and name a successor trustee to take over at incapacity or death. Corporate trustees are an option where the assets are complex or family dynamics are difficult.
What happens if a trust is not funded? The assets left outside it pass through probate as though the trust did not exist. Funding, meaning retitling accounts and deeds into the trust’s name, is what makes it operative.
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