What Is a Marital Trust?

A Marital Trust is a legal arrangement designed to transfer assets from one spouse to another in a manner that provides tax advantages and asset protection. Commonly used in estate planning, a marital trust ensures that assets pass to a surviving spouse upon the death of the first spouse, while preserving control over how those assets are eventually distributed — typically to children or other heirs. It plays an important role in helping married couples reduce or defer estate taxes and meet specific inheritance goals.

Purpose and Structure

The primary purpose of a marital trust is to provide financial support to a surviving spouse while maintaining control over the eventual distribution of the remaining assets. The trust becomes active after the death of the first spouse, at which point the designated assets are transferred into the trust. The surviving spouse then becomes the trust’s income beneficiary and may also have access to the principal under certain conditions.

Marital trusts are typically funded with an amount equal to the portion of the estate that would otherwise be subject to estate taxes, minus the applicable estate tax exemption. By using the unlimited marital deduction — a provision in the U.S. tax code that allows for the tax-free transfer of assets between spouses — the marital trust delays any estate tax liability until the death of the second spouse.

The trust is generally structured to qualify for the marital deduction under IRS guidelines, which means that all income generated by the trust must be paid to the surviving spouse at least annually. In many cases, the surviving spouse is granted limited access to principal through a provision known as a "power of invasion" or "ascertainable standard," typically tied to health, education, maintenance, or support (HEMS).

Types of Marital Trusts

While the term “marital trust” can refer to any trust designed to benefit a surviving spouse and qualify for the marital deduction, it is most often associated with Qualified Terminable Interest Property (QTIP) Trusts. These trusts are frequently used when the person setting up the estate (the grantor) wants to provide for a current spouse while ensuring that the remaining assets eventually go to children from a prior marriage or to other named beneficiaries.

A QTIP trust allows the surviving spouse to receive income from the trust during their lifetime, but they do not have control over the ultimate distribution of the remaining trust assets. The original grantor, through the trust document, controls who receives the trust’s assets after the surviving spouse passes away.

There are also general power of appointment trusts, which give the surviving spouse more control — including the power to redirect the trust assets through their own estate plans. These may be used when both spouses are aligned in their wishes and there is no concern about the surviving spouse redirecting wealth away from intended heirs.

Tax Implications

One of the key benefits of a marital trust is the ability to defer federal estate taxes. Under the unlimited marital deduction, any assets left to a U.S. citizen spouse are not subject to estate tax at the time of the first spouse’s death. The estate tax is instead postponed until the second spouse dies.

With a QTIP trust, although the assets qualify for the marital deduction, they are still included in the surviving spouse’s estate for estate tax purposes. That means any taxes owed are paid after the second death, based on the total value of the assets remaining in the trust at that time.

It’s important to note that the marital deduction only applies when the surviving spouse is a U.S. citizen. For non-citizen spouses, a Qualified Domestic Trust (QDOT) must be used to achieve similar tax benefits.

Considerations and Limitations

A marital trust can be an effective way to balance support for a surviving spouse with control over the long-term disposition of wealth. However, it comes with some trade-offs. The surviving spouse may have limited control over the trust’s principal and no ability to change beneficiaries. Additionally, the eventual taxation of the trust's assets in the surviving spouse’s estate can reduce the total inheritance passed on to heirs.

These trusts are irrevocable once the first spouse dies, meaning that the terms cannot be altered. Careful planning is necessary to align the trust with the couple’s financial goals, family dynamics, and estate tax strategies. Coordination with other estate planning tools — such as bypass trusts or lifetime gifting — may be required to fully optimize tax outcomes.

Real-World Applications

Marital trusts are commonly used in blended families where the grantor wants to provide for a new spouse but also ensure that children from a prior marriage inherit the remaining assets. They are also used by wealthy couples seeking to maximize the estate tax exemption of both spouses while maintaining control over asset flow across generations.

Financial advisors and estate planning attorneys typically work together to determine whether a marital trust — and which type — aligns with a client’s overall goals. In most cases, a marital trust is used alongside other planning vehicles in a broader estate plan.

The Bottom Line

A marital trust is a strategic tool in estate planning that provides financial security for a surviving spouse and allows the original grantor to control how assets are distributed after both spouses have passed. It takes advantage of the marital deduction to delay estate taxes while helping preserve wealth for future generations. Proper design and legal guidance are essential, particularly in complex family or tax situations.