A dynasty trust becomes durable when the people around it remain engaged.
getty
Most people outside the ultra-high-net-worth world think of a trust as a static legal document designed to avoid taxes and pass down money.
In reality, a dynasty trust is far more dynamic. It can function as a long-term governance system for family capital, shaping how wealth is invested, distributed, protected, and even taught across generations.
The challenge is that these structures are not self-sustaining simply because they were well drafted. Tax laws change, family dynamics evolve, assets become more complex, and what once worked efficiently may eventually create friction. A dynasty trust only fulfills its purpose when it is actively managed, periodically revisited, and treated as a living structure rather than a permanent monument to a past planning decision.
The Core Idea
Many multigenerational trusts are designed to be grantor trusts for income-tax purposes, even though the assets may sit outside the grantor’s taxable estate for transfer-tax planning.
The core idea is simple: the IRS treats a grantor trust as owned by the grantor for income-tax purposes when certain retained powers exist, and the income is taxed to the grantor rather than to the trust itself.
That is why intentionally defective grantor trusts, or IDGTs, remain useful. If the trust does not pay its own income tax, more of the trust’s capital can remain invested. In practical terms, the grantor’s tax payments can operate like an additional economic transfer because they leave trust assets untouched.
But the IRS also makes clear that the grantor is taxed on trust income, whether or not the cash is distributed. So an elegant structure can become uncomfortable if the trust produces a large tax bill, holds illiquid assets, or simply grows large enough that the annual burden begins to crowd out other planning decisions.
As attorney Matthew Erskine noted in Estate And Gift Tax Planning For 2026 And Beyond, long-term exempt trust planning can be highly valuable. The mistake is assuming the original design never needs to be revisited.
When Non-Grantor Status Starts to Look Better
There are times when families decide that grantor trust status has done its job and no longer fits the moment. Sometimes the issue is cash flow. Sometimes it is a change in state tax exposure. Sometimes the grantor no longer wants to keep paying tax on wealth that is no longer intended for personal use.
IRS guidance explains that grantor trusts are not recognized as separate taxable entities. Once grantor treatment no longer applies, the trust generally becomes responsible for its own reporting and tax payments unless income is distributed out. That can relieve pressure on the grantor, even if it gives up some of the efficiency that made the structure attractive in the first place.
What A Swap Power Really Does
One of the most useful tools inside many grantor trusts is the substitution power, often called a swap power. IRS Revenue Ruling 2008-22 explains that a grantor’s retained power to reacquire trust property by substituting assets of equivalent value will not, by itself, pull the trust assets back into the grantor’s gross estate, provided the trustee has a fiduciary obligation to ensure equivalent value and prevent any shifting of benefits among beneficiaries.
Why does that matter? Because of asset location.
If a family wants future appreciation outside the taxable estate, high-growth assets may belong inside the trust. If the family later wants low-basis assets back in the estate so heirs may receive a basis adjustment at death, a properly administered swap power can help make that possible. The IRS notes that inherited property generally takes a basis equal to fair market value at death.
The Human Side of a Technical Structure
These mechanics matter even more when a dynasty trust is being used as a family bank. If the trust is making loans, backing ventures, or funding co-investments for younger family members, liquidity and valuation are no longer academic. They affect real decisions, real accountability, and real relationships inside the family.
The best family offices do not treat trust administration as clerical work. They treat it as stewardship. The President and Chief Executive Officer of Pitcairn, Andy Busser, captured that well in Why Family Office Leaders Should Think Like Mentors, Not Executives. Families do not need a trust that merely exists. They need one that teaches, adapts, and stays aligned.
A dynasty trust becomes durable when the people around it remain engaged. Trustees who exercise real judgment, beneficiaries who understand the purpose of the capital, and advisors who keep revisiting the structure instead of admiring it from a distance.
Gold Family Wealth
257 Riverside Ave., 1st Floor
Westport, CT 06880
646-844-2533
Investment advisory services offered through CWM, LLC, an SEC Registered Investment Advisor. Matthew Erskine & Andy Busser are not affiliates of CWM, LLC. Opinions expressed may not be representative of CWM, LLC.
>> Home