Work From Home in Portugal? The Tax Authority Says That Could Cost You Your Capital-Gains Exemption

Portugal's tax authority (Autoridade Tributária, or AT) ruled on July 27 that taxpayers who use part of their primary residence as a workspace can lose the capital-gains tax exemption on selling that home, even if they reinvest the proceeds in another primary residence. The binding ruling states that any professional use of the property, however partial, means it no longer qualifies as being used "exclusively" for permanent housing, one of the legal conditions for the exemption.

A tax lawyer who reviewed the ruling for ECO says that requirement doesn't actually appear in the law: the law, he says, never required exclusive use in the first place.

The case that prompted the ruling

The ruling responds to a request from a now-retired lawyer who has lived in, and worked from, the same property since 2019, after it was assigned to him in a divorce settlement. He has held his official tax residence there for more than six years and asked the AT a direct question: did that history satisfy the legal requirement that a home serve as the taxpayer's permanent residence for the 12 months before a sale, allowing him to claim the reinvestment exemption if he sold and bought another primary home? The AT said no, reasoning entirely on the fact that he continued practicing law from part of the same property. Even though the property had been re-registered from "services" to "residential" use in the land registry earlier this year, the AT found that any ongoing professional use, however small a share of the property it occupies, breaks the "exclusive" housing requirement the exemption depends on.

The ruling devotes considerable attention to defining what counts as a permanent residence at all: a place with the "stability and durability" of centered domestic life, somewhere a person "sleeps, eats meals, receives family and friends," and has built "the home with all the associated ritual and ties." Having met all of that, in the AT's own telling, still wasn't enough. Its conclusion was direct: because part of the property was allocated to legal practice, "the property in question is not exclusively allocated to permanent own housing," and the exemption doesn't apply.

A tax lawyer says the AT is adding a rule the law doesn't contain

Luís Leon, a tax lawyer and co-founder of the consultancy Ilya, disputes the AT's reading directly. "The position now taken by the Tax Authority seems to introduce a requirement that doesn't follow from the letter of the law," he told ECO, "that the property has to be used exclusively as permanent own housing." He argues the IRS Code only requires that a property serve as the taxpayer's or household's permanent residence, and "doesn't determine that no part of the housing can be used for professional activity, for remote work, for occasionally receiving clients, or for serving as a company's registered address."

Leon's specific concern is who this hits hardest. "This interpretation can have especially harsh consequences for independent workers, small business owners, and professionals with fewer resources, who frequently carry out part of their activity from their own residence," he said, adding that turning a spare room into a home office shouldn't be enough to change the tax treatment of the whole property. He also argues the ruling creates an arbitrary split between taxpayers based on whether they can afford separate commercial premises: "this position creates an evident inequality between those who have dedicated professional premises and those who, for economic reasons or the nature of their activity, work from home." His recommendation is that the AT reverse the interpretation, or that lawmakers step in directly: "a change of this magnitude cannot result from an administrative reading that adds to the law a condition the legislator did not establish."

The stakes are broader than one retired lawyer's case. JN's coverage of the ruling names the professions most directly exposed: lawyers, consultants, architects, designers, accountants, and other service providers who use part of their residence as a professional space now risk a tax penalty they wouldn't have anticipated when they decided to sell. Remote and hybrid work has become common since the pandemic, and Portugal has in recent years marketed itself as a destination for remote workers and freelancers, many of whom work from home by necessity or design rather than owning or renting a separate office.

The same week, a second ruling narrowed a different exemption

The home-office ruling wasn't an isolated decision. The same week, the AT issued a separate binding ruling clarifying that Portugal's newer capital-gains exemption for reinvestment in rental housing, created by Decreto-Lei n.º 97/2026 to encourage rental supply, only covers buying a property that's already built. Buying land and constructing a house intended for rental doesn't qualify, even when that's the sole purpose of the project. The AT's reasoning drew an explicit contrast: the older, separate exemption for primary-residence reinvestment does allow land purchase and construction costs to count, and the newer rental-focused law contains no equivalent language. The AT read that gap as deliberate, not an oversight, concluding that "acquisition of property" legally presupposes buying something already built, not land you intend to build on.

The legal basis, for anyone checking their own situation

The rental-reinvestment exemption comes from Lei n.º 9-A/2026 of March 6 and Decreto-Lei n.º 97/2026 of May 20, covering sales between January 1, 2026 and December 31, 2029, reinvested in rental housing with rent capped at €2,300 a month, within a window running from 24 months before the sale to 36 months after. The separate, long-standing primary-residence exemption at the center of the home-office ruling is set out in Article 10, No. 5 of the IRS Code, and taxpayers aged 65 or older have an additional option: reinvesting in eligible financial products within six months instead of buying another home.

What this means if you're selling

Binding rulings like these apply directly only to the taxpayer who requested them, but they show how the AT is likely to interpret the law in similar cases. None of them change the underlying law. What they show is a tax authority consistently reading its own exemptions as narrowly as the text plausibly allows, on reinvestment timing, on land and construction, on inherited property, and now on any professional use of a home, however partial. Taxpayers who assume a straightforward reading of "primary residence" or "reinvestment in rental housing" will qualify them for these exemptions should know the AT has consistently adopted narrower interpretations than some tax practitioners believe the legislation requires. Anyone selling a property where part of it has ever served a professional purpose, and planning to lean on the reinvestment exemption, would be well advised to get specific tax advice before assuming the exemption applies, and to watch whether courts ultimately disagree with the AT here, as the Constitutional Court did in a different capital-gains case earlier this year.