SEISEI INSIGHTS — Family Wealth

A Family Office Is Not a Tax-Saving Device: When the Scale Justifies One, and What It Actually Does in Japan

2026-06-25

"A friend set up a family office in Singapore — should I have one too?" We hear this question repeatedly from clients in Japan who hold significant assets. In most cases, two things need to be clarified first: at what scale a family office begins to make sense, and what it does — and does not — deliver when established in Japan.

What a Family Office Is

A family office is an organization dedicated to managing one family's wealth. It broadly takes two forms. A single-family office (SFO) serves one family alone, staffed with investment, tax, legal, and administrative professionals, and carries correspondingly high operating costs. A multi-family office (MFO) shares one team across several families — lower in cost, but less tailored.

Expecting a "Tax Break" Leads to the Wrong Decision

Singapore offers a framework (the schemes commonly referred to as 13O and 13U) under which a fund's income can be exempt from tax where conditions such as a minimum level of assets under management, local employment, and local spending are met; it also imposes no estate tax and no capital gains tax. These conditions are why many wealthy families locate a family office there.

Japan, by contrast, offers no special tax treatment directed at family offices as such. Establishing a family office in Japan is, in substance, the same as establishing an ordinary asset-management company (a holding company), and its income is subject to corporate tax in the normal way. That said, dividends received by a holding company benefit from the exclusion of dividends received from gross income (Article 23, Paragraph 1 of the Corporation Tax Act), which adjusts double taxation between companies within defined limits — a mechanism that operates equally within a family-office structure.

In Japan, the Point Is Governance, Not Tax Saving

So where is the value of a family office in Japan, absent any tax incentive? The answer is management — governance. Beyond a certain scale, what becomes necessary is not clever techniques to shave the tax bill, but integrating functions such as:

Managing multiple entities (holding company, operating companies, real-estate entities) as one
Coordinating external professionals — tax accountants, lawyers, judicial scriveners, insurance advisers
Establishing family governance: who manages what, who succeeds to what, how decisions are made
Consolidating tax compliance across Japan, the home country, and possibly a third country

A family office is not a loophole. It is a management framework that binds the tools used separately until now — incorporation, family entities, holding companies, trusts, insurance, gifting — into a single system.

Realistic Options by Asset Scale

Viewed structurally, the progression we map out is roughly as follows:

Approximate asset scale	Likely structure
Smaller	Holding company + external tax accountant
Mid-size	Simplified family office (holding company + external tax accountant and lawyer)
Large	Consider a standalone family office (but no tax incentive in Japan)
Very large	Overseas (e.g. Singapore) becomes an option — but worldwide taxation still reaches a Japan-resident individual, which is the central issue

The key point: the belief that "setting up a family office lets you avoid tax obligations" is mistaken. First put the holding company in order; with a professional versed in international taxation, take a full inventory of family assets; and on that basis plan incorporation, trusts, insurance, and gifting over the medium to long term. That sequence of organization itself functions, in substance, as a "simplified family office." The specific combination and order must be developed together with a licensed professional.

This article provides general information on tax systems and does not constitute individual tax consultation. Specific filings and tax computations are handled by licensed partner tax accountants whom we introduce.

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