A non-exempt trust is a trust that hasn’t had the grantor’s generation-skipping transfer (GST) tax exemption allocated to it, which leaves transfers from the trust to grandchildren or more remote descendants exposed to a flat 40% GST tax. Each person has a $15 million GST exemption in 2026 that can be spread across trusts and direct gifts to shield those transfers.1Office of the Law Revision Counsel. 26 USC 2631 – GST Exemption When exemption isn’t allocated, whether through oversight or because the trust’s value exceeds what’s available, the trust becomes non-exempt and the tax hit can be enormous.
How a Trust Ends Up Non-Exempt
The technical dividing line between an exempt and non-exempt trust is a single number: the inclusion ratio. It equals 1 minus the “applicable fraction,” which is the GST exemption allocated to the trust divided by the total property transferred into it.2Office of the Law Revision Counsel. 26 USC 2642 – Inclusion Ratio
Fund a trust with $5 million and allocate $5 million of GST exemption to it, and the inclusion ratio is 0. That trust is fully exempt. Fund the same trust and allocate zero exemption, and the inclusion ratio is 1. That trust is fully non-exempt, and every qualifying transfer gets taxed at the maximum GST rate.3Office of the Law Revision Counsel. 26 USC 2641 – Applicable Rate Allocate $3 million of exemption to a $5 million trust and the inclusion ratio is 0.40, meaning every generation-skipping transfer from that trust incurs GST tax calculated on 40% of its value.
Three common paths lead to non-exempt status.
The first is that no exemption was allocated at all. Allocation is usually reported on a gift tax return (Form 709), and if a grantor funds a trust without formally allocating exemption, the trust starts life as non-exempt. This happens more often with trusts set up without specialized estate planning counsel.
The second is that the trust’s value exceeds the exemption available. A grantor who funds a $20 million trust but has only $15 million of remaining GST exemption can shield only the first $15 million. The excess $5 million portion carries a non-zero inclusion ratio.
The third is an election out of automatic allocation. The tax code automatically allocates unused GST exemption to direct skips and to transfers to trusts that could benefit skip persons, bringing the inclusion ratio to zero if sufficient exemption remains. Grantors can override this default by filing an election on a timely gift tax return, sometimes deliberately to preserve exemption for other trusts, sometimes accidentally by checking the wrong box.4Office of the Law Revision Counsel. 26 USC 2632 – Special Rules for Allocation of GST Exemption
When the GST Tax Actually Hits
Having a non-exempt trust doesn’t mean the 40% tax applies the moment property enters the trust. The tax is triggered only when one of three events occurs.
A direct skip is a transfer directly to a skip person, meaning someone two or more generations below the grantor, such as a grandchild. If the grantor transfers $1 million from a non-exempt trust straight to a grandchild, the GST tax applies immediately.
A taxable distribution is a distribution from a trust to a skip person that isn’t a direct skip or a taxable termination. If a trustee writes a check from a non-exempt trust to the grantor’s grandchild for college expenses, that triggers the tax. The beneficiary who receives the distribution is responsible for paying it.
A taxable termination happens when an interest in the trust ends through death, lapse of time, or release of a power, and afterward only skip persons have any interest in the trust property. The trustee pays the tax in this case.5Internal Revenue Service. Instructions for Form 706-GS(T)
The GST rate is not a flat 40% in every case. It equals the maximum federal estate tax rate (40%) multiplied by the trust’s inclusion ratio.3Office of the Law Revision Counsel. 26 USC 2641 – Applicable Rate A fully non-exempt trust pays the full 40%. A trust with an inclusion ratio of 0.40 pays an effective rate of 16%. A fully exempt trust pays nothing.
Splitting a Partially Exempt Trust
A trust stuck with an inclusion ratio between 0 and 1 creates ongoing headaches because every distribution requires a fractional GST tax calculation. The tax code addresses this through a qualified severance. If a trust is partially exempt, the trustee can divide it into two separate trusts: one that receives a fractional share equal to the applicable fraction and becomes fully exempt, and another that receives the remainder and becomes fully non-exempt.2Office of the Law Revision Counsel. 26 USC 2642 – Inclusion Ratio
Once split, the trustee can direct distributions to skip persons from the exempt trust and reserve the non-exempt trust for distributions to non-skip beneficiaries like the grantor’s children. The total pool of assets is unchanged, but the GST tax exposure is concentrated where it does no damage.
Trusts That Commonly End Up Non-Exempt
Any trust can be non-exempt if GST exemption isn’t properly allocated, but certain structures are more likely to end up in that category.
A revocable living trust is the most common example. Because the grantor retains full control, including the power to modify terms, swap assets, or dissolve the trust entirely, a revocable trust is automatically a grantor trust for income tax purposes and its assets are included in the grantor’s taxable estate. Many families create revocable trusts primarily to avoid probate rather than for GST planning, so the exemption often goes unallocated.
Grantor retained annuity trusts (GRATs) are irrevocable trusts where the grantor receives fixed annuity payments for a set number of years and whatever remains at the end passes to beneficiaries. Because the value of the remainder interest is uncertain during the annuity term, allocating GST exemption at the time of the gift is inefficient. Most estate planners don’t bother, leaving the GRAT non-exempt and directing remainders to non-skip beneficiaries instead.
Irrevocable life insurance trusts, dynasty trusts, and other long-term vehicles can also end up non-exempt when they’re funded with assets exceeding the grantor’s available GST exemption or when the allocation falls through the cracks during estate administration.
Filing Obligations When GST Tax Is Owed
Non-exempt trusts that trigger the GST tax carry their own filing requirements on top of ordinary income tax reporting. Trustees file Form 706-GS(T) for taxable terminations. Skip-person beneficiaries file Form 706-GS(D) for taxable distributions. Both forms share the same timeline as the trust’s income tax return, and a six-month automatic extension is available by filing Form 7004 before the original deadline. The extension gives extra time to file but not to pay. Interest accrues on unpaid GST tax from the original due date.6eCFR. 26 CFR 26.6081-1 – Automatic Extension of Time for Filing Generation-Skipping Transfer Tax Returns
A domestic trust with gross income of $600 or more in a tax year must also file Form 1041, the income tax return for estates and trusts, and prepare Schedule K-1 for any beneficiaries receiving distributions.7Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1 A trust’s GST status does not change how its income is taxed.
Why Non-Exempt Trusts Still Get Used
Non-exempt trusts serve important purposes that have nothing to do with the GST tax. The most common reason families create them is to avoid probate. Assets held in a properly funded trust pass directly to beneficiaries without court proceedings, which saves time, reduces legal costs, and keeps the transfer private. Wills typically become public records once filed with the probate court.
Trusts also build in a plan for incapacity. If the grantor becomes unable to manage their own affairs, the successor trustee steps in and manages the trust assets without the family petitioning a court for guardianship or conservatorship.
Beyond these structural benefits, trusts give the grantor detailed control over distributions. A grantor can specify that a beneficiary receives income only after reaching a certain age, that distributions are limited to education or medical expenses, or that a trustee has discretion to withhold funds during a divorce or financial trouble. None of these controls depend on the trust’s GST exemption status, and none of them require the trust to be exempt to work. Where GST exposure matters is when distributions are headed to grandchildren or beyond. For a non-exempt trust in that situation, a qualified severance or a redirection of distributions to non-skip beneficiaries is often the cleanest answer.