The disadvantages of a generation-skipping trust fall into a few hard categories: you give up control of the assets permanently, you pay substantial setup and annual costs, trust income gets taxed at the top federal rate once earnings exceed $16,000, and a single misstep in allocating your GST exemption can expose the trust to a 40% generation-skipping transfer tax decades later. For families whose wealth sits below the 2026 exemption of $15 million per person, those downsides often outweigh any benefit at all.
You Can’t Undo It
A generation-skipping trust is almost always irrevocable. Once you fund it, you cannot pull money back out, change the investment strategy, or redirect assets to a different beneficiary. If your financial situation deteriorates after funding, those assets are gone. That is the trade at the heart of the structure: the tax benefits exist precisely because the assets are no longer yours.
The rigidity bites hardest when family circumstances shift. A beneficiary going through a divorce, struggling with addiction, or facing a lawsuit may need different protections than the original document contemplated. The terms were set years or decades ago, and the trust does not bend to accommodate new realities.
Two legal workarounds exist, and neither is simple. Decanting allows a trustee to pour assets from the original trust into a new trust with updated terms. Not every state permits this, and where it is allowed the trustee’s power to change terms varies significantly. The other option is judicial modification, which means petitioning a court to alter the trust. Courts require proof of changed circumstances or a drafting error, and the process is adversarial, slow, and expensive. Legal fees for a contested modification can easily reach tens of thousands of dollars with no guarantee the court will approve the changes.
Setup and Ongoing Costs Are Steep
Setting up the trust requires specialized estate planning attorneys and tax professionals. Legal and drafting fees commonly start in the $15,000 to $25,000 range and climb from there depending on the complexity of the assets involved. That initial outlay is only the beginning.
Most generation-skipping trusts need a professional corporate trustee to manage ongoing compliance. Annual trustee fees typically run between 1% and 3% of total trust assets. On a $5 million trust, that means $50,000 to $150,000 per year before any other costs. The trust also files its own income tax return each year using IRS Form 1041, which requires a tax professional familiar with trust taxation and GST allocation rules.1Internal Revenue Service. Instructions for Form 1041 Add accounting fees, investment management, and periodic legal reviews, and the annual overhead can meaningfully erode principal over time.
Much of that cost goes toward monitoring the trust’s inclusion ratio, which determines what share of the trust is protected from the GST tax. The math is straightforward in concept but unforgiving in practice. One miscalculation or missed filing can leave part of the trust exposed to a 40% tax decades later. Keeping the ratio at zero requires attention on every transfer, every allocation, and every tax return for the life of the trust. Compared to a basic revocable trust, where none of this monitoring exists, the sustained expense is a real drag on the wealth the structure is supposed to preserve.
Retained Income Hits the Top Bracket Almost Immediately
Any income the trust earns and keeps rather than distributing to beneficiaries gets taxed under a brutally compressed rate schedule. For 2026, a trust hits the top federal income tax rate of 37% once its taxable income exceeds just $16,000.2Internal Revenue Service. Form 1041-ES – Estimated Income Tax for Estates and Trusts An individual does not reach that same 37% bracket until their income exceeds roughly $626,000. The 2026 trust brackets look like this:
- $0 to $3,300: 10%
- $3,300 to $11,700: 24%
- $11,700 to $16,000: 35%
- Over $16,000: 37%
The 15% bracket does not exist for trusts. The schedule jumps from 10% straight to 24%. A trust earning $50,000 in interest or capital gains pays the same marginal rate as an individual earning over half a million dollars. On top of that, retained investment income above the top-bracket threshold also triggers the 3.8% Net Investment Income Tax, pushing the effective federal rate above 40%.
Trustees can soften the hit by distributing income to beneficiaries, which shifts the tax to the beneficiary’s personal return at their presumably lower rates. But distributing income to avoid the trust-level tax defeats part of the reason to keep assets inside the trust for long-term compounding. Every dollar distributed is a dollar no longer growing tax-deferred inside the structure. There is no clean answer to the tension between minimizing current income tax and maximizing long-term wealth transfer.
Allocating the GST Exemption Is Easy to Get Wrong
The entire tax advantage of a generation-skipping trust depends on correctly allocating your GST exemption to the trust. For 2026, the exemption is $15 million per person after the increase enacted by the One, Big, Beautiful Bill signed into law in 2025.3Internal Revenue Service. Whats New – Estate and Gift Tax It is a large number but a finite one. If the exemption is not properly allocated to your trust, part or all of the trust loses its protection from the 40% GST tax.
The goal is an inclusion ratio of zero, meaning every dollar in the trust is fully exempt. The inclusion ratio is calculated using a fraction: the GST exemption allocated to the trust divided by the value of the property transferred in.4Bloomberg Law. IRC 2642 – Inclusion Ratio Transfer $5 million and allocate $5 million of exemption, and the inclusion ratio is zero. Allocate only $3 million of exemption to a $5 million trust, and the inclusion ratio is 0.4. That means 40% of every future distribution or termination will be hit with the GST tax.
Allocation can happen automatically or manually. Automatic allocation kicks in for certain direct gifts to skip persons, but it does not always produce the most efficient result and can consume exemption on transfers where you would rather save it.5eCFR. 26 CFR 26.2632-1 – Allocation of GST Exemption Manual allocation requires filing IRS Form 709 on time, including extensions.6Internal Revenue Service. Instructions for Form 709 – United States Gift and Generation-Skipping Transfer Tax Return A late allocation is not necessarily fatal, but it uses the asset value as of the date the late filing is made rather than the original transfer date. If the trust assets have appreciated significantly, a late allocation forces you to burn through more exemption to cover the same assets. On a fast-growing portfolio, the difference can be millions of dollars of wasted exemption.
The worst outcome is a complete failure to allocate, which leaves the trust with an inclusion ratio of one and every dollar fully exposed to the 40% tax. The IRS offers relief for late allocations through its private letter ruling program, and an automatic six-month extension is available if the original return was filed on time but the allocation was simply omitted.7Federal Register. Relief Provisions Respecting Timely Allocation of GST Exemption and Certain GST Elections Pursuing a private letter ruling is expensive and uncertain, and none of these safety nets eliminate the underlying risk.
A trust that ends up with an inclusion ratio between zero and one can be partially rescued through a qualified severance, which splits the trust into one fully exempt trust and one fully non-exempt trust.8Office of the Law Revision Counsel. 26 USC 2642 – Inclusion Ratio It adds another layer of legal and administrative cost, and the non-exempt portion still faces the full 40% tax.
The Tax Bill Often Lands on the Beneficiary
Many grantors assume the trust itself absorbs the GST tax. The answer depends on the type of transfer. When the trust makes a taxable distribution to a grandchild or other skip person, the beneficiary personally owes the tax.9Office of the Law Revision Counsel. 26 USC 2603 – Liability for Tax The calculation is tax-inclusive, so a grandchild receiving a $1 million distribution from a fully non-exempt trust owes $400,000 in GST tax out of that distribution and keeps only $600,000. For taxable terminations, the trustee pays the tax from trust assets before distributing anything.
The practical problem is that beneficiaries expecting a large distribution are often blindsided by the bill. If the exemption was not properly allocated decades earlier, a grandchild who thought they were inheriting $2 million might net barely over $1 million after the GST tax, plus whatever income tax they owe on the distribution. The grantor who set up the trust is usually long dead by the time this bill comes due, and the beneficiary has no ability to fix the allocation after the fact.
Your Children Are Bypassed
The word “skipping” describes exactly what happens to your children. In a typical structure, the principal passes directly to grandchildren or later generations, and the children’s generation receives nothing from the trust corpus. Some trusts are drafted to give children access to income the trust generates while reserving the underlying assets for the skip generation. Even that limited access depends entirely on how the trust was drafted. A trust designed purely for tax efficiency might give the children no beneficial interest at all.
This creates real family tension. Your children may watch a substantial portion of the family’s wealth pass through a structure they cannot touch, held for beneficiaries who may be toddlers or not yet born. If a child faces a financial emergency, the trust has no mechanism to help unless the original terms specifically authorized it. If a child serves as trustee, they bear fiduciary duties and administrative burdens for a trust that primarily benefits someone else. The tax math may favor skipping a generation, but the emotional and relational costs are harder to calculate.
State Law Can Force the Trust to End
Generation-skipping trusts are often intended to last for multiple generations, sometimes centuries, to maximize the tax-free growth of exempt assets. Whether state law permits this depends on where the trust is administered. The common law Rule Against Perpetuities traditionally required trust interests to vest within 21 years after the death of someone alive when the trust was created. Many states have abolished or modified this rule, but others still impose fixed durational limits.
When a trust hits its state-law expiration date, it must terminate and distribute its assets. Those assets then become part of the receiving beneficiary’s taxable estate, which is precisely the outcome the trust was designed to prevent. A trust that worked perfectly for tax purposes for 90 years can still fail at year 91 if the governing state law forces a distribution.
Choosing where to establish the trust is one of the most consequential decisions in the planning process. States compete for trust business and the differences are substantial. Some impose no income tax on trust earnings; others tax accumulated income at full state rates. Some allow trusts to exist in perpetuity; others cap duration. A state’s approach to decanting, trust protector powers, and beneficiary rights all affect how much flexibility the trust retains over time. Changing the trust’s situs after creation is sometimes possible, but it introduces its own legal complexity and may trigger unintended consequences under the new state’s laws.
You May Not Need One at All
The 2026 GST exemption of $15 million per person, $30 million for a married couple, is the highest it has ever been.3Internal Revenue Service. Whats New – Estate and Gift Tax For families whose total wealth falls below that threshold, a generation-skipping trust often creates more problems than it solves. The administrative costs, loss of control, and compressed tax brackets are real disadvantages regardless of estate size, and if your estate will not trigger the GST tax in the first place, you are paying those costs for a benefit you do not need.
For families well above the exemption, the stakes of proper planning are enormous. The GST tax rate is 40%, calculated as the maximum federal estate tax rate multiplied by the trust’s inclusion ratio.10Office of the Law Revision Counsel. 26 USC 2641 – Applicable Rate11Office of the Law Revision Counsel. 26 USC 2001 – Imposition and Rate of Tax On a $50 million estate, the portion exceeding the exemption faces combined estate and GST taxes that can consume well over half the transferred wealth if the trust is not structured correctly.
The exemption amount has also changed multiple times in recent years and could change again. The current $15 million figure resulted from legislation signed in mid-2025 that replaced a scheduled reduction back to roughly $7 million.12GovInfo. 26 USC 2010 – Unified Credit Against Estate Tax Building a multi-generational trust around a specific exemption number that Congress can change at any time adds legislative risk that no amount of careful drafting can fully eliminate.