A generation-skipping trust is an estate planning tool that allows you to transfer wealth directly to grandchildren, great-grandchildren, or other skip persons while minimizing or avoiding the generation-skipping transfer (GST) tax. Unlike regular inheritance transfers that trigger a 40% flat tax on amounts exceeding the exemption, GST trusts allow tax-free growth across multiple generations—so a $5 million transfer can grow to $20 million, with the entire amount remaining exempt from GST taxation. For high-net-worth families, this represents one of the most powerful wealth preservation strategies available under current federal law. The appeal of GST trusts has become even more compelling with recent changes to exemption limits. In 2026, thanks to the One Big Beautiful Bill Act (P.L.
119-21), the GST exemption increased to $15 million per individual or $30 million for married couples—up from $13.99 million in 2025. This means that most families can now transfer substantially more wealth without triggering the GST tax, and those who do fund a GST trust enjoy permanent tax-free growth on that exemption amount for as long as the trust exists. The exemption remains in effect through 2033, though it will revert to pre-2018 levels unless Congress extends it further. Understanding how GST trusts work, who benefits from them, and how to structure them properly has become increasingly important as families navigate the current tax landscape. Even small planning errors can result in unexpected 40% tax bills on transfers you intended to protect.
Table of Contents
- Who Qualifies as a Skip Person and Why That Matters
- How the GST Tax Works and Why the 2026 Changes Matter
- The Dynasty Trust Benefit—Permanent Tax-Free Growth
- Who Should Consider a Generation-Skipping Trust and When
- Common Pitfalls and the High Cost of Mistakes
- State Law Variations and Dynasty Trust Planning
- Looking Ahead—The 2033 Deadline and Long-Term Planning Strategy
- Conclusion
Who Qualifies as a Skip Person and Why That Matters
The first key to understanding generation-skipping trusts is recognizing exactly who the law considers a “skip person.” Under IRS regulations, a skip person is someone more than one generation below you—typically grandchildren or great-grandchildren—or anyone more than 37½ years younger than you. This age-based definition means that a family friend or non-family member can also be a skip person, as can younger generations within your own family if they’re sufficiently younger than you. When you transfer assets directly to a skip person or to a trust established for their benefit, the GST tax applies unless you’ve used your exemption. The generational structure matters because the IRS treats each generation separately for tax purposes.
A transfer to your child incurs gift or estate tax (up to 40%) but not the additional GST tax. A transfer to your grandchild, however, triggers both the potential estate tax and the GST tax—a double layer of taxation that can consume half or more of the intended transfer. By contrast, a properly structured GST trust can eliminate this double taxation entirely, allowing wealth to flow through generations without additional tax burden. For example, if you transfer $10 million to a trust for the benefit of your grandchild using your GST exemption, the entire $10 million grows tax-free indefinitely. Without using the exemption, every dollar of growth above the current exemption limit would be subject to the 40% flat GST tax.
How the GST Tax Works and Why the 2026 Changes Matter
The generation-skipping transfer tax operates alongside the federal gift and estate tax, not instead of it. When you make a transfer to a skip person or a trust for their benefit, the IRS asks whether you’ve used your GST exemption. If you haven’t, the transfer is taxable at a flat rate of 40%—the same rate as the federal estate tax. This 40% tax is assessed in addition to any other gift or estate taxes owed, making it a significant penalty for improper planning. For example, if you leave $2 million to your grandchild and have no GST exemption remaining, the IRS would collect $800,000 in GST tax alone, leaving only $1.2 million for the intended beneficiary.
The 2026 increase in the exemption amount to $15 million per individual represents a major shift in planning strategy. Under the previous framework, the exemption was set to sunset in 2025, reverting to approximately $7 million (indexed for inflation). The OBBBA made a crucial change: it raised the exemption to $15 million and extended it permanently through 2033, with annual inflation adjustments beginning in 2027. However, the exemption is not truly permanent—it will revert to pre-2018 levels after 2033 unless Congress acts again. This creates a planning window where families can transfer larger amounts tax-free, but also introduces uncertainty about what happens after 2033. Those who fail to fund a GST trust during this period could face significant tax consequences if the exemption reverts, making timing a critical consideration for high-net-worth families.
The Dynasty Trust Benefit—Permanent Tax-Free Growth
One of the most powerful features of a GST trust is its ability to generate tax-free growth for multiple generations. When you place assets in a GST trust using your exemption, not only do those initial assets escape GST taxation, but all future growth escapes as well. This dynasty effect can result in extraordinary wealth accumulation over time. Consider a practical example: if you fund a GST trust with $5 million and that investment grows at an average annual return of 7%, after 30 years the trust would hold approximately $38 million. Because the entire amount is protected by your GST exemption, none of that growth is subject to the 40% GST tax.
Without the GST trust, the growth above your exemption would trigger the flat 40% tax, meaning your beneficiaries would lose nearly $13 million to taxes. The tax-free growth applies for the lifetime of the trust and extends to subsequent generations, making GST trusts particularly valuable for long-term wealth preservation. Many states now allow perpetual trusts that never terminate, meaning assets can continue to grow and compound for generations without triggering GST tax. This is especially attractive in low-tax or no-income-tax states, which have become popular jurisdictions for dynasty trusts. The combination of GST exemption protection and perpetual trust structure can result in wealth that grows exponentially across time—a powerful tool for building intergenerational financial security.
Who Should Consider a Generation-Skipping Trust and When
For most American families, a GST trust may not be necessary. The $15 million individual exemption means that families with assets below that threshold can leave wealth to grandchildren without GST taxation. Many middle-class and even upper-middle-class families fall into this category and should focus on simpler planning tools like basic wills, regular trusts, and life insurance strategies. However, for high-net-worth families, business owners, and those with significant appreciating assets, a GST trust becomes highly attractive—especially when considering the tax-free growth potential over decades. The timing of GST trust funding is critical.
Because the exemption will likely revert to lower levels after 2033, financial advisors generally recommend that high-net-worth clients maximize their exemption during the current window. This doesn’t mean everyone must fund a GST trust immediately, but it does mean that families with substantial net worth should review their situation soon. A married couple with a $20 million estate, for example, can use their combined $30 million exemption to fund a GST trust for grandchildren without any tax cost. If they delay and the exemption reverts to $7 million in 2034, funding the same trust then could trigger significant GST taxation. The cost-benefit analysis favors planning now rather than waiting for potentially worse outcomes later.
Common Pitfalls and the High Cost of Mistakes
The complexity of GST tax rules means that planning mistakes can be extremely expensive. Incorrectly structured trusts, improper exemption allocation, or failure to update trust documents after legislative changes can result in unexpected 40% tax bills. One common error occurs when a trust is intended to be GST-exempt but the exemption is never properly allocated to it. Without explicit allocation, the IRS may treat the trust as non-exempt, and distributions to grandchildren could trigger the full 40% GST tax. Correcting such errors is difficult and often impossible after the fact, making the initial planning decision critical.
Another frequent mistake involves blended trusts that benefit both children and grandchildren. The tax treatment becomes complex and depends on how the trust is structured and how distributions are made. An improperly designed blended trust might inadvertently trigger GST taxation on distributions intended to be tax-free. Additionally, families sometimes fail to account for the interaction between GST exemption and estate tax exemption. The same exemption amount applies to both gift/estate tax and GST tax, so using $10 million of your exemption for a GST trust leaves only $5 million available for other estate planning purposes (assuming you have a $15 million total exemption). Understanding these tradeoffs requires careful professional guidance, and the cost of professional advice is far lower than the cost of a 40% GST tax mistake.
State Law Variations and Dynasty Trust Planning
State law plays an important role in GST trust planning because different states have different rules about trust duration, creditor protection, and tax treatment. Some states, particularly those with no state income tax, have become popular jurisdictions for dynasty trusts because they offer both federal GST tax benefits and state tax advantages. For example, a dynasty trust established in South Dakota or Nevada can benefit from no state income tax while the grantor lives, and the trust itself incurs no state income tax on its earnings.
By contrast, a dynasty trust in a high-income-tax state like California or New York faces ongoing state income tax burden that reduces the effectiveness of federal GST exemption planning. Many high-net-worth families now establish GST trusts in favorable trust states, using what’s called a “situs trust.” This allows them to gain the advantages of a favorable state law while having the trust administered in that state. However, such planning requires careful attention to income sourcing rules and the potential for multi-state taxation disputes. Professional guidance from attorneys familiar with both trust law and GST taxation is essential for implementing these strategies correctly.
Looking Ahead—The 2033 Deadline and Long-Term Planning Strategy
The current GST exemption is set to expire after 2033, creating a critical planning window for families with substantial wealth. While the exemption increase from OBBBA drew minimal debate in Congress, suggesting the framework will remain stable through 2033, the eventual reversion to lower levels is a serious concern. Some tax professionals recommend that high-net-worth families maximize their exemption usage before the deadline, even if that means funding trusts larger than they might otherwise prefer. The logic is straightforward: using $15 million of exemption now means that assets grow tax-free forever, whereas waiting and having to use a lower exemption in 2034 means some assets will face GST taxation.
Long-term planning strategy should account for the possibility that Congress might extend or further increase the exemption, but should not depend on it. A conservative approach involves funding a full GST trust with your available exemption while it’s high, then reassessing after 2033 based on whatever the new exemption level is at that time. For couples, this might mean a $30 million trust funded now, with additional flexibility to make further transfers based on future exemption levels. This approach captures the current favorable exemption while maintaining flexibility for future changes.
Conclusion
Generation-skipping trusts are among the most powerful wealth-preservation tools available to high-net-worth families, allowing tax-free growth across multiple generations when properly structured. The 2026 increase in the GST exemption to $15 million per individual—and the extension of that exemption through 2033—has created a significant planning opportunity for families with substantial assets. For most families, the current exemption is sufficient to avoid GST taxation entirely, but for those with wealth in excess of the exemption, a properly drafted GST trust can mean the difference between preserving assets and losing nearly half to taxation.
The key takeaway for retirement and pension security planning is that GST trust planning should be part of any comprehensive estate strategy for high-net-worth clients. The cost of professional guidance from an experienced estate attorney is far lower than the cost of mistakes, and the tax savings can be enormous. As the 2033 deadline approaches, now is the time for families to review their situation and determine whether GST trust planning makes sense for their circumstances. Those who act proactively can lock in the current favorable exemption, while those who wait risk facing higher GST taxation when the exemption reverts to lower levels.