The Dynasty Trust

Most fortunes do not survive three generations, and tax is one reason why. In many countries, wealth is taxed each time it passes from one generation to the next. Pass a fortune down three times and the tax authority can take a large share three times over, quite apart from what heirs spend or lose. The dynasty trust is the structure built to stop that clock: to hold wealth for grandchildren, great-grandchildren and beyond, without being taxed at each handover, and without any single heir being able to break it up.

It is the most ambitious thing a family does with a trust, because it is a bet against time.

The idea

A dynasty trust is an irrevocable trust designed to last for many generations, sometimes forever. The founder funds it once, using their lifetime exemption from transfer and generation-skipping tax where available. From then on, the assets belong to the trust, not to any individual. Descendants become beneficiaries who can receive income and distributions at the trustee's discretion, but they never personally own the capital, so it is never in any heir's taxable estate and never exposed to any heir's divorce or creditors.

The result is compounding left undisturbed. A pool that is never carved up by tax or divided among heirs at each death can grow across a century in a way that a fortune passed hand to hand almost never does.

The rule it had to defeat

For centuries, the common law refused to let anyone control property forever. The rule against perpetuities forced trusts to end within roughly a lifetime plus twenty-one years, on the principle that the dead should not rule the living indefinitely. That rule made true dynasty trusts impossible.

Then a competition began. To attract trust business, a number of US states simply repealed or drastically extended the rule. South Dakota led and remains the standard-bearer; Nevada, Delaware and Alaska followed, among others. In these states a trust can now last for centuries or in perpetuity. That single legislative change is why an American dynasty trust is so often domiciled in South Dakota even when the family has never set foot there. Offshore centres, including the Cook Islands and Nevis, now permit perpetual trusts as well.

The lesson is that a dynasty trust is only as durable as the law of the place it lives. Choosing the jurisdiction is choosing how long the structure can last, which is why families domicile these trusts where perpetuity is allowed, regardless of where they themselves reside.

What it buys, and what it costs

The benefits are real: one taxable event instead of many, a century of undisturbed compounding, and protection at every generation from the creditors, divorces and misjudgements of individual heirs. For a family that thinks in generations, nothing else does quite this.

The costs are equally real, and worth naming. The founder gives up control permanently. The terms written today govern descendants not yet born, in a world no one can predict, which is why the trustee's discretion and a well-drafted deed matter enormously. And a structure meant to last forever can calcify: rules that made sense in one era can trap a family in another. Good dynasty trusts are drafted with flexibility, mechanisms to adapt, decant into a new trust, or replace trustees, precisely because forever is a long time.

A dynasty trust protects a fortune from time and tax. Our next structure protects it from something more immediate and more hostile: other people who want to take it. In Part 4, the asset-protection trust, and why the strongest ones are not American at all.