Selo editorial — Decision Room, Vieira da Fonseca
Articles — July 2026

When a home becomes more than a home

The tax detail that could change the cost of your decision.

There are decisions whose true impact only reveals itself many years later. Not because the law changed overnight, but because a detail that seemed irrelevant gains significance precisely at the moment we decide to sell a property.

In recent days, an interpretation by the Tax Authority has returned to the centre of public debate, raising questions about the impact that using a home for professional purposes may have on the taxation of capital gains.

It is important to begin with an essential point: this is not a new law, nor a rule that applies automatically to all property owners. It is a tax interpretation that may yet be subject to discussion and further development. Even so, it is enough to remind us that certain decisions — made in an apparently innocuous way over the years — can produce unexpected consequences for one's estate.

Today, thousands of self-employed professionals, business owners and consultants work, wholly or in part, from home. For many, the home has also become the place where they receive clients, carry out their activity, or hold the tax address associated with their professional practice. In most cases, these choices are made for reasons of convenience or efficiency, with no awareness that they may one day carry consequences.

This is precisely where the matter becomes interesting.

When the moment comes to sell a home, most people focus on the market value, price trends or reinvestment conditions. Rarely do they consider how that property was used during the years they owned it. And yet it is often precisely those details that may call for more careful analysis before any decision is taken.

This is an excellent illustration of the difference between knowing a rule and understanding its context.

A wealth decision does not begin the day a property is put on the market. It begins much earlier — in the way one's estate was built, used, structured for tax purposes and integrated into the life of its holder. It is this broader view that allows one to anticipate risks, ask the right questions and avoid surprises when the consequences are already difficult to reverse.

More than seeking quick answers, I believe the real value lies in identifying — in advance — the questions that deserve to be put to the right professionals. Because, more often than not, protecting a decision does not mean knowing everything. It means knowing which questions to ask before moving forward.

This is precisely why I continue to believe that the most considered wealth decisions begin long before the choice of a property. They begin with an understanding of context.

Note: This article is purely informational in nature and does not constitute legal or tax advice. Each situation should be analysed individually by a lawyer or tax adviser, taking into account the specific circumstances of each case.