European Commission Pushes Lisbon to Update Imóveis Patrimonial Values Across the IMI Base — Brussels' Country-Specific Recommendation Frames a Recurrent-Tax Pivot Against the IMT Transaction Stack to Unlock Vacant Stock

The European Commission's Country-Specific Recommendation for Portugal, published on Wednesday 3 June within the 2026 European Semester package, asks Lisbon to revisit the way it taxes residential property — and to do so as a way of pulling vacant stock back onto the market. The headline ask is technical: the Commission wants Portugal to update the valor patrimonial tributário (taxable patrimonial value) registered with the Autoridade Tributária (Tax Authority), the figure on which IMI (Imposto Municipal sobre Imóveis, the Municipal Property Tax) is calculated. In most cases that valuation sits well below the actual market value of the home — sometimes by a factor of two or three — and the gap has widened sharply since the 2015 inflection point on Portuguese house prices.

The Recurrent-Tax Pivot Brussels Wants to See

The Commission's text frames the recommendation as a structural recalibration rather than a one-off tax rise. The preferred move is to substitute IMT (Imposto Municipal sobre Transmissões Onerosas de Imóveis, the Municipal Property Transaction Tax) for IMI — that is, to lean less on the transaction-side levy that fires when a property changes hands, and more on the annual recurrent charge that lands every January regardless of whether the property is rented, lived in, or empty. The expected mechanical effect: owners holding shuttered homes off the market would face a meaningfully higher annual carrying cost, while transaction friction on movement would ease. Brussels argues this would 'create incentives for owners to place underutilised properties on the market and promote residential mobility'.

The Vacant-Home Backdrop Driving the Ask

The recommendation lands against a Portuguese vacancy tape that the Commission describes as 'significant'. Brussels notes that Portugal carries a 'comparatively elevated proportion of dwellings that are not used as a principal residence, with a significant number of devoluto (vacant) and degradado (degraded) properties' — a structural overhang that the post-2015 price doubling has not dislodged. The Commission's housing chapter pairs the IMI ask with a broader complaint: 'persistent structural imbalances between supply and demand', sharpest in coastal and urban zones, that have driven Portuguese house prices through one of the largest cumulative increases in the European Union over the past decade.

What This Means for Expats and Property Owners

• If you own a vacant property: The risk profile shifts from a quiet IMI line item to a potentially material annual cost if the patrimonial-value update goes through. Properties last revalued in 2003–2012 are exposed to the largest delta.
• If you're buying: Watch for a possible IMT cut as the political quid pro quo. The Commission explicitly frames the move as a substitution, not an addition, which is the political cover any government would need to pass it.
• If you rent: The mechanism's stated goal is to push more units into the rental pool. The transmission is slow — patrimonial reviews take years to push through Autoridade Tributária — but the directional pressure on supply is downward on rents.
• Policy timing read: CSRs are recommendations, not directives. The Portuguese Government can ignore them, partially adopt them, or fold them into a 2027 budget package. Watch the autumn Orçamento do Estado debate for the political read.

The Country-Specific Recommendation also packages a complementary ask: that Portugal 'expand the supply of housing, including affordable and social housing' and 'reinforce coordination and governance of housing policy together with integrated planning of urban areas and transport'. The IMI/IMT pivot is the fiscal lever in that broader Brussels housing prescription — and the one that touches Portuguese homeowners most directly.