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Library guide · Family Offices

What Is a Private Trust Company?

The in-house trustee that lets a family keep control of its own trusts while meeting fiduciary standards.

Last updated 8 August 2026 · 2 min read

A private trust company, or PTC, is a company that a family creates specifically to act as the trustee of its own trusts, instead of using an external professional trustee. It keeps control of trusteeship close to the family and its governance while still meeting professional fiduciary standards.

For most trusts, the trustee is an outside professional: a bank or a trust firm you hire and, if needed, replace. For a large family, that arrangement has a drawback. The most important role in the structure, the one that legally owns everything, sits with a stranger. The private trust company is the answer.

What it is

A private trust company, or PTC, is a company the family creates to act as the trustee of its own trusts. Instead of appointing an external trustee, the family appoints a company it owns and controls. That company, staffed or administered professionally and governed by a board that can include family members, trusted advisers and independent professionals, holds and administers the family's trusts.

The effect is subtle but powerful: trusteeship stays inside the family's world, while still being carried out to professional fiduciary standards.

Why family offices favour it

The PTC has become the trustee of choice for substantial family offices for three reasons.

Control and closeness. The family influences trustee decisions through the PTC's board, rather than lobbying an outside trustee who serves many clients.

Continuity and knowledge. A PTC accumulates institutional memory of the family, its assets and its intentions across generations, in a way a rotating cast of external trustees never can.

Independence from any one provider. The family is not dependent on, or captive to, a single external trust firm, and can bring specialist administration in as a service rather than a master.

The trade-offs

A PTC is not for everyone. It must be established, governed and administered properly, which carries cost and complexity that only make sense for large, multigenerational structures. And it demands careful design: if the family's control is exercised too heavily, it can undermine the very protection and tax treatment the trusts were built for. The PTC's own governance, and often an independent element on its board, is what keeps it a genuine fiduciary rather than a puppet.

For a family with serious wealth held in trust across generations, though, the PTC resolves the central tension of trust planning, giving up control to gain protection, by letting the family keep a professional, accountable hand on the tiller. It is one of the clearest markers of a family office built to last.

Frequently asked questions

What is a private trust company?
A private trust company (PTC) is a company set up by a family to serve as the trustee of that family's own trusts. Rather than handing trusteeship to an outside trust firm, the family controls the trustee, a company it owns and governs, while still meeting fiduciary duties.
Why do family offices use a private trust company?
To keep control and continuity. A PTC lets the family stay close to trustee decisions, retain institutional knowledge across generations, and avoid depending on, or paying, an external trustee, while still providing the professional, accountable trusteeship that trusts require.
What are the drawbacks of a private trust company?
Cost and complexity. A PTC must be established, staffed or administered, and governed properly, which only makes sense for substantial, multigenerational structures. It also requires careful design so the family's control does not undermine the trusts' protection or tax treatment.

This guide is educational and general in nature. It does not constitute investment, legal, tax or financial advice.