Families often explore generation-skipping transfer (GST) strategies when they want to transfer wealth efficiently across multiple generations. Two structures commonly used for this purpose are the generation-skipping transfer trust (GST trust) and dynasty trusts. While they share similar tax mechanics, they serve different planning goals and carry different levels of complexity. Understanding how each works and when each is appropriate is essential for effective estate planning.
What is a GST trust?
A GST trust is an irrevocable trust that allows grantors to pass assets directly to beneficiaries at least two generations younger, typically grandchildren, without those assets being included in their children’s taxable estates.
GST trusts provide the traditional benefits of irrevocable trusts, including asset protection and the ability to stipulate how the assets will be used, but they also offer a significant tax advantage: They allow families to avoid a layer of estate tax that would normally apply when assets pass from children to grandchildren. To achieve this, the trust makes a generation-skipping transfer tax election, and the grantor allocates their GST tax exemption which is aligned with the current federal estate tax exemption of $15 million per person.
Because GST tax-exempt assets remain in trust for the children’s lifetimes, those assets aren’t included in the children’s estates at death. This is the core mechanism that preserves wealth for the grandchildren.
How GST planning preserves wealth
Consider a couple with an $80 million estate, one child, and three grandchildren. At this level of wealth, estate tax applies. Subtract their exemptions ($15m each, $30m total), and $50 million is taxable, making the estate tax due around $20 million. This leaves roughly $60 million for their child as an inheritance.
The couple’s child invests the money wisely, and the assets grow to $100m before the child ultimately passes away.
Without proper GST trust planning, the $100m could potentially be taxable within the child’s estate. If you assume the current estate tax law holds, a $100m estate less a $30m exemption results in estate taxes of approximately $28m (40% of $70m). This leaves $72m to be split between the original couple’s three grandchildren, or $24m each. In this example, the second hit of estate tax triggers an additional $28m cost to the family’s wealth.
Proper GST trust planning changes that outcome. If the original couple instead places $30m of the child’s $60m inheritance into a GST tax-exempt trust for their child’s benefit, those assets can support the child during their lifetime but won’t be included in the child’s estate. Assuming the GST-exempt and non-GST-exempt portions grow at the same rate, the $30m GST-exempt portion would grow to $50m when the total assets reach $100m. That $50m could pass to the grandchildren without being subject to estate tax at the child’s generation.
The remaining $50m held outside the GST trust would be subject to the child’s $30m estate tax exemption, leaving $20m subject to estate tax. At a 40% rate, that results in approximately $8m of estate tax. The family would therefore have approximately $92m remaining for the three grandchildren, or about $30.67m each, compared with $24m each without the GST trust planning. That’s approximately $6.67m more per grandchild, or $20m more preserved for the family overall.
Potential drawbacks of a GST trust
While GST trusts offer meaningful tax efficiency, they also introduce important considerations:
- Administrative complexity. GST trusts require ongoing trust administration, including accountings, tax returns, and compliance with GST trust tax rules. Drafting these long-duration instruments often requires specialized estate planning counsel.
- Costs. Legal, tax, and fiduciary fees can be significant for trusts intended to last multiple generations.
- Family dynamics. Skipping a generation can create family tension if expectations aren’t aligned. Clear communication, including structured family discussions, helps ensure beneficiaries understand the trust’s purpose.
- Appropriateness. For families far below the exemption threshold, the complexity and cost may outweigh the benefits. GST trusts are most effective for families with substantial wealth and a clear desire to eventually support grandchildren.
A common misconception
Families sometimes hesitate when they hear the term “generation-skipping trust,” assuming it means their children are being skipped entirely. In reality, the children can still be beneficiaries of the GST trust and receive support during their lifetimes. What’s being “skipped” isn’t the children themselves, but the estate tax layer that would otherwise apply when assets pass from the children to the grandchildren.
GST trusts are most useful when the children already have taxable estates of their own and won’t need additional assets. By keeping the original assets in a GST-exempt trust rather than transferring them outright, the family avoids the estate tax on those assets that would be due at the children’s deaths. The strategy preserves more wealth for the grandchildren while still allowing the children to benefit from the trust during their lifetimes.
How a dynasty trust extends the strategy
A dynasty trust builds on the GST trust structure. It’s designed to last for multiple generations, sometimes indefinitely, depending on state law. The trust is funded with GST tax-exempt assets, but instead of distributing those assets to grandchildren, the trust continues for future descendants. The distinction between the trust types is important: all dynasty trusts are GST trusts, but not all GST trusts are dynasty trusts. The distinguishing factor is when the assets are finally distributed.
The long-duration structure of the dynasty trust allows assets to avoid estate and GST taxes at each generational level and compound over time without transfer-tax erosion.
Dynasty trusts are most valuable for families with significant wealth, where multigenerational tax efficiency and asset protection can materially change outcomes.
When a dynasty trust makes sense — and when it doesn’t
Many people imagine dynasty trusts as perpetual structures benefiting generations of future descendants. In reality, most dynasty trusts don’t last more than a few generations. As distributions accumulate across a growing number of beneficiaries, assets often diminish faster than expected.
Emotional considerations also matter. Some grantors question whether they want to benefit descendants they’ll never know, or whether long-duration trusts could unintentionally create family conflict. Preparing future generations through education and governance becomes increasingly important as trust duration and asset size grow.
Trustee selection and state law considerations for long-duration trusts
Because dynasty trusts are designed to last for many decades, often beyond the lifetimes of the initial trustees, families typically need a professional trustee. Even GST trusts that end at the grandchildren level often name a professional trustee as a backstop, recognizing that trusted individuals may no longer be available when future beneficiaries come of age.
State law also plays a role. Some states follow the traditional rule against perpetuities (requiring closure of the trust 21 years after the death of the youngest measuring life), while others allow trusts to last 360 years or more. Long-duration trusts often require situsing the trust in a state with favorable perpetuities rules and naming a trustee located in that state. This adds complexity and cost.
Building a framework for future generations
GST trusts and dynasty trusts require coordinated expertise across estate planning, tax planning, trust administration, and family-dynamics advisory. Because federal and state rules are intricate, families benefit from working closely with experienced attorneys, tax advisors, and fiduciary professionals who can help structure, administer, and communicate the plan effectively.
Families typically consider GST trusts when the goal is to eventually benefit grandchildren in a tax-efficient manner. A dynasty trust comes into play when the goal is to preserve and govern wealth across many generations, allowing assets to compound while avoiding estate and GST taxes at each generational level.
As you consider your long-term goals, these tools give you a way to move beyond short-term planning and build a legacy that endures. With the right structure in place, you can help future generations thrive, reinforce the values that matter to you, and ensure your wealth is used wisely. Your decision will depend on your estate size, family dynamics, and the level of oversight you’re comfortable maintaining — but when aligned with your vision, these trusts can help you secure a legacy that lasts.
Key questions: Evaluating GST trusts and dynasty trusts
When evaluating a GST trust:
- Will you create an estate tax issue for your children if assets pass outright?
- Is tax-efficient transfer at your children’s level a priority?
- Are your children already financially independent?
- Do your grandchildren have identifiable needs you want to support?
- Can your estate be effectively distributed within one or two generations?
When evaluating a dynasty trust:
- Is your estate large enough to benefit from multigenerational tax efficiency?
- Do you want assets to remain in trust for multiple generations rather than distribute outright?
- Are you comfortable with long-term trustee oversight and the administrative complexity that comes with it?
- Will future beneficiaries be prepared for the responsibilities and dynamics of a long-duration trust?
- Does your long-term vision include supporting descendants you may never meet?
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