What Is a Property Swap (Permuta)?
A property swap, known in Portugal as permuta de imóveis, is a transaction in which two parties exchange their properties directly, without a traditional sale and purchase. Instead of each party selling their property and buying the other's, they simply swap ownership.
This mechanism has a significant tax advantage under Portuguese law: IMT (Imposto Municipal sobre Transmissões Onerosas de Imóveis) and Stamp Duty (Imposto de Selo) are calculated only on the difference in value between the two properties, not on the full value of each.
How the Tax Calculation Works
Under Article 2 of the CIMT (Código do IMT), in a property swap, only the party receiving the higher-value property pays IMT and Stamp Duty — and only on the difference between the two values.
Example:
| Property A | Property B | |
|---|---|---|
| Market value | €250,000 | €320,000 |
| VPT (Patrimonial Value) | €180,000 | €240,000 |
In this case, the owner of Property A receives the higher-value Property B. The taxable base is the difference: €320,000 − €250,000 = €70,000 (or the VPT difference if higher: €240,000 − €180,000 = €60,000). The taxable base is the higher of the two: €70,000.
Compare this to a traditional sale and purchase:
- Selling Property A and buying Property B would mean paying IMT on €320,000 (the full purchase price)
- At a typical rate of 6-8%, that's €19,200 - €25,600 in IMT alone
- In a swap, IMT on €70,000 at the same rate is only €4,200 - €5,600
Potential saving: €15,000 - €20,000 in IMT alone.
Stamp Duty in a Swap
Stamp Duty (Imposto de Selo) at 0.8% also applies only to the difference. On €70,000, that's €560 — compared to €2,560 on the full €320,000 in a traditional purchase.
Capital Gains Tax Considerations
A property swap is treated as a disposal for capital gains purposes. If the property you're giving up has appreciated since you bought it, you may have a taxable gain.
For primary residences (Habitação Própria e Permanente), the standard reinvestment exemption applies: if you reinvest the proceeds in a new primary residence within 36 months (or 24 months before the sale), the gain is fully exempt from IRS.
For investment properties, 50% of the gain is included in your taxable income (for residents), taxed at your marginal rate or 28% flat — whichever is lower.
The Anti-Abuse Rule: Watch the 1-Year Resale
Portuguese tax law includes an important anti-abuse provision: if you sell a property acquired through a swap within 12 months, the IMT is recalculated on the full value of the property — not just the difference. This eliminates the tax advantage retroactively.
This rule exists to prevent investors from using swaps purely as a tax-avoidance mechanism for quick flips. If you plan to resell within a year, a traditional purchase may be more appropriate.
Tornas: Cash Payments to Balance the Swap
When the two properties have different values, the party receiving the higher-value property typically pays the difference in cash. This cash payment is called tornas. The tornas amount is subject to Stamp Duty at 0.8%.
For example, if Property A is worth €250,000 and Property B is worth €320,000, the owner of Property A would pay €70,000 in tornas to the owner of Property B.
When Does a Swap Make Sense?
A property swap is most advantageous when:
-
Both parties want to exchange properties — this requires finding a willing counterpart, which is the main practical challenge
-
The properties have similar values — the smaller the difference, the greater the tax saving relative to a traditional transaction
-
Neither party plans to resell within 12 months — to avoid the anti-abuse rule
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At least one property is a primary residence — to potentially benefit from the capital gains reinvestment exemption
Practical Steps
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Agree on the value of each property (ideally supported by independent valuations)
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Verify the VPT (Valor Patrimonial Tributário) of each property at the local Finanças office
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Engage a notary (notário) to draft the swap deed (escritura de permuta)
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Both parties sign the deed simultaneously
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Pay IMT and Stamp Duty on the difference before or at the notary
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Register the new ownership at the Land Registry (Conservatória do Registo Predial)
Use the Property Swap Calculator
To calculate the exact IMT and Stamp Duty savings for your specific situation, use our Property Swap Calculator. Enter the values of both properties and see the tax comparison instantly.
Enquadramento Legal
Regulada no Código Civil (artigos 480.º+). Duas partes trocam imóveis com ou sem torna (compensação monetária). Escritura única reduz custos administrativos.
Fiscalidade
IMT incide apenas sobre a torna (diferença de valores) — principal vantagem fiscal. IS de 0.8% incide sobre o valor mais elevado. Mais-valias calculadas como venda normal. Isenção por reinvestimento em HPP aplica-se.
Quando é Vantajosa
Valores semelhantes (menor torna = menor IMT). Ambas as partes querem mudar (evita período de transição). Reorganização de património familiar. Diversificação de carteira sem realizar mais-valias imediatas.
Riscos
Avaliação justa necessária (AT pode questionar subavaliações). Hipotecas existentes requerem autorização bancária. Vícios ocultos — inspecções técnicas essenciais.
Use a nossa Calculadora de Permuta para simular o impacto fiscal.