Setting Up a Family Office in Luxembourg: A Practical Guide

Setting up a family office in Luxembourg is the step many wealthy families take when their affairs outgrow a single private-banking relationship. A family office is a dedicated organisation that manages a family's wealth, administration and legacy in a coordinated way. This guide covers single versus multi-family offices, the services involved, realistic costs, how Luxembourg's CSSF regulates the sector, when it makes sense, and how to establish sound governance.

What a family office is

A family office centralises everything that touches a family's capital: investment oversight, tax and legal coordination, accounting and reporting, succession planning, and often lifestyle matters such as property and philanthropy. Instead of the family juggling a dozen banks, lawyers and accountants independently, one team holds the full picture and acts in the family's sole interest.

Luxembourg is a natural home for this. As a leading cross-border wealth centre with a stable AAA-rated government, deep fund expertise and multilingual professionals, it lets an international family run its affairs from a single, well-regulated jurisdiction at the heart of the EU.

Single vs multi-family office

There are two models.

A single-family office (SFO) serves one family exclusively. It offers total control and privacy but carries the full cost — staff, offices, systems — alone. An SFO usually becomes viable only for very large fortunes.

A multi-family office (MFO) serves several families, sharing infrastructure and expertise across them. Costs are lower per family and access to specialists is often broader, at the price of less exclusivity. Many families begin with an MFO and graduate to an SFO as wealth grows.

Services provided

A full-service family office typically covers:

• Investment management: setting strategy, selecting and monitoring managers, consolidated reporting across all banks.
• Tax and legal coordination: working with advisors in each relevant country.
• Estate and succession planning: wills, holding structures, preparing the next generation.
• Administration and accounting: consolidated statements, cash-flow management, bill payment.
• Philanthropy and governance: foundations, family charters, family councils.

The unifying value is consolidation: one clear view of a complex, multi-jurisdiction balance sheet.

Regulation and the CSSF

Not every family office in Luxembourg is licensed, and the distinction matters. Since a 2012 law, the activity of "family office" as a commercial service to third parties is regulated, and professionals offering it to other families generally fall under CSSF supervision — for example as investment advisors or through the Professionals of the Financial Sector (PFS) regime. A genuine single-family office serving only its own family typically does not require a licence, because it is not offering services to the public. Families should take legal advice on which regime applies to their specific setup.

When does it make sense?

Cost is the deciding factor. A rough rule of thumb across the industry: a single-family office rarely makes economic sense below €100 million, because running costs of roughly 0.5%–1% of assets translate into a meaningful annual budget. A multi-family office can serve families from around €25 million because the fixed costs are shared.

A worked example

Imagine a family with €150 million. A single-family office costing 0.6% per year runs to €900,000 annually — a real expense, but one that buys a team of perhaps five to eight professionals, consolidated reporting and undivided loyalty. For a family with €30 million, that same team would cost 3% of assets, which is why an MFO, sharing costs across several families, is the sensible route until wealth grows further.

Building governance

Governance is what turns a family office from an administrative service into a durable institution. Key elements include a family charter setting out shared values and decision rules, a family council that meets regularly, clear reporting lines between the family and the office, and a plan for preparing the next generation to be responsible owners. Good governance reduces conflict, survives generational transitions and ensures the office serves the family rather than the reverse.

Frequently Asked Questions

How much wealth do you need for a family office in Luxembourg? A multi-family office typically makes sense from around €25 million, while a dedicated single-family office usually becomes economical only above €100 million because of its fixed running costs.

Does a Luxembourg family office need a CSSF licence? A single-family office serving only its own family generally does not, but a multi-family office offering services to other families is typically regulated and supervised by the CSSF.

What does a family office cost to run? Running costs commonly range from about 0.5% to 1% of assets under management per year for a single-family office, covering staff, systems, premises and external specialists.