Cascais Property Taxes: Real Cost Examples for Buyer

Buying property in Cascais is not the same as buying an average property in Portugal. The tax rules may be national, but the numbers are very local.

A percentage that looks manageable in a generic Portugal guide can become a six-figure decision when applied to a €900,000 apartment in Cascais centre or a €4.5 million villa in Quinta da Marinha. This is where many international buyers underestimate the real acquisition budget.

At RE/MAX Cidadela, we have worked from Cascais since 2004 and regularly help international buyers compare the asking price with the real purchase cost: IMT, Stamp Duty, IMI, VPT, financing costs and, in prime property cases, AIMI. In our experience, the biggest tax mistakes rarely happen because buyers ignore the law completely. They happen because buyers use generic national examples for a market where the price points are anything but generic.

This article is a local companion to our complete guide to property taxes in Portugal for real estate investors. That broader guide explains the national framework: IMT, IMI, AIMI, rental income tax, capital gains and ownership structure. This article does something narrower: it shows what the numbers can look like in Cascais, Estoril and Quinta da Marinha.

For the full national framework — including IMT, IMI, AIMI, rental income tax, capital gains and ownership structure — read our complete guide to property taxes in Portugal for real estate investors. This article focuses only on Cascais-specific examples.

Quick Summary

• A non-resident buying a €900,000 apartment in Cascais centre may pay around €74,700 in IMT and Stamp Duty before notary, registry, legal or mortgage costs.
• A non-resident buying a €4.5 million villa in Quinta da Marinha may pay around €373,500 in core acquisition taxes.
• A relocating buyer purchasing a €600,000 primary residence in Estoril may pay around €39,000 in IMT and Stamp Duty if eligible for the habitação própria e permanente treatment.
• IMI in Cascais is not calculated on the purchase price. It is calculated on the VPT, or Valor Patrimonial Tributário, shown in the property’s caderneta predial.
• AIMI becomes especially important in prime Cascais property because it depends on the combined VPT of residential property owned in Portugal.
• Non-resident buyers should check the 2026 IMT rules carefully. In some cases, buyers who become Portuguese tax residents within two years may be able to request the cancellation of the difference between the non-resident IMT paid and the tax that would apply under the standard scale.
• Before making an offer in Cascais, buyers should ask for a property-specific tax simulation, not rely only on generic online calculators.

The three Cascais scenarios we will use

The examples below are not theoretical national averages. They reflect realistic price levels for the type of buyers currently looking at Cascais, Estoril and Quinta da Marinha.

These figures include only IMT and Stamp Duty on the acquisition. They do not include notary fees, land registry costs, legal fees, bank commissions, valuation costs or Stamp Duty on the mortgage.

Example 1: €900,000 apartment in Cascais centre

A €900,000 apartment in Cascais centre is a realistic example for international buyers looking for lifestyle, walkability, proximity to the bay, restaurants, shops, the train station and the historic centre.

Let’s assume the buyer is non-resident and is buying the property as a second home.

The important number here is not just €900,000. It is €974,700 before adding other acquisition costs.

That is why a buyer who says “my budget is €900,000” may actually need to look at properties below that level, unless they have separate liquidity for taxes and closing costs.

The annual IMI cannot be calculated from the purchase price alone. A €900,000 apartment may have a VPT significantly below the market value, especially if it is an older property. If the VPT were €500,000, a general IMI rate of 0.35% would produce an annual IMI of around €1,750. If the VPT were €650,000, the annual IMI would be around €2,275.

The lesson is simple: before making an offer, ask for the caderneta predial and confirm the VPT.

Example 2: €4.5 million villa in Quinta da Marinha

Quinta da Marinha is one of the strongest luxury locations in the Cascais market. At this level, the buyer is not simply comparing price per square metre. They are paying for plot size, privacy, architecture, outdoor living, proximity to golf, security, lifestyle and, in some cases, sea proximity or views.

A €4.5 million villa is now a much more realistic example for the prime segment than a €2 million figure, especially for renovated or contemporary properties in the best parts of the area.

Let’s assume the buyer is non-resident and buying the villa as a second home.

The acquisition tax alone can be close to €373,500. That is before legal fees, registry costs, bank charges, mortgage-related Stamp Duty or any renovation budget.

At this level, AIMI also deserves attention. AIMI is not calculated on the market price, but on the combined VPT of residential property and building land owned in Portugal. For individual taxpayers, there is generally a €600,000 deduction, or €1.2 million for married couples or civil partners who opt for joint taxation.

For planning purposes, a buyer should ask three questions before signing the CPCV:

A simplified AIMI planning table may look like this for an individual buyer, assuming the applicable deduction and marginal treatment are confirmed by the tax adviser:

These figures are illustrative. The final calculation depends on the exact VPT, ownership structure, marital status, existing Portuguese property and the applicable tax treatment at the time of assessment.

For a luxury buyer, this is not a minor detail. Over a 10-year ownership period, annual property taxes can become a meaningful part of the total cost of owning a prime Cascais asset.

Example 3: €600,000 property in Estoril as a primary residence

Not every international buyer is buying a second home. Many are relocating to Portugal and intend to use the property as their primary permanent residence.

That distinction can change the IMT calculation.

Let’s assume a buyer is purchasing a €600,000 property in Estoril and is eligible for the habitação própria e permanente treatment.

This is still a significant tax cost, but it is lower than the non-resident second-home scenario.

If the same €600,000 property were treated as a non-resident second-home acquisition, the IMT at 7.5% would be €45,000. That means the IMT difference alone would be around €10,762.

This is why relocating buyers should not leave tax-residency planning until after the promissory contract. If the buyer is not yet resident at the time of purchase but becomes Portuguese tax resident within two years, the 2026 rules may allow a request to cancel the difference between the IMT paid and the amount due under the applicable standard scale.

This should not be treated as automatic. It must be checked with a tax adviser, and the buyer needs to comply with the legal deadlines and formal requirements.

Why VPT should be checked before the offer

In Cascais, the market price and the taxable value are often very different.

The market price reflects location, demand, view, condition, scarcity, architecture and buyer competition. The VPT is the official taxable value used by the Portuguese Tax Authority. IMI and AIMI are normally based on the VPT, not on the amount paid for the property.

This is why two apartments both selling for €900,000 in Cascais centre can produce different annual IMI bills.

The practical step is simple: before making an offer, ask for the caderneta predial. This document allows your adviser to check the VPT, the property classification, the fiscal area and the basis for annual municipal taxation.

For buyers comparing several properties, this can become part of the decision. A home that looks slightly more expensive may have a more favourable ongoing tax profile. Another home that looks cheaper may come with a higher VPT, renovation risk or future fiscal exposure.

What changes if the buyer becomes tax resident?

The biggest difference in the 2026 rules is the treatment of non-resident buyers.

For many second-home buyers, the 7.5% IMT rate will be the central acquisition cost. But for relocation buyers, there may be a different outcome if they become Portuguese tax residents within the required period and follow the formal procedure.

This matters especially for buyers from the United States, Brazil, the United Kingdom, France, South Africa or other markets who are still organising their move at the time of purchase.

In practical terms, the buyer should clarify three points before signing:

This is not only a tax question. It can affect how much cash the buyer needs at completion.

Cascais buyer checklist before signing the CPCV

Before signing a promissory contract in Cascais, Estoril or Quinta da Marinha, a buyer should have more than a purchase price.

A safer acquisition budget should include:

The mistake is not buying in Cascais. The mistake is buying without knowing the full number.

FAQs about property taxes when buying in Cascais

How much tax do I pay on a €900,000 apartment in Cascais?

A non-resident second-home buyer may pay around €74,700 in core acquisition taxes: approximately €67,500 in IMT and €7,200 in Stamp Duty. This does not include legal fees, registration, notary costs, bank charges or mortgage-related taxes.

How much tax do I pay on a €4.5 million villa in Quinta da Marinha?

A non-resident buyer may pay around €373,500 in IMT and Stamp Duty on the acquisition. The buyer should also check annual IMI and potential AIMI, because luxury villas may have a high VPT.

Is IMI in Cascais calculated on the purchase price?

No. IMI is calculated on the VPT, not on the market price. This is why the caderneta predial is essential before making a final estimate.

Does every luxury property in Cascais pay AIMI?

Not necessarily. AIMI depends on the combined VPT of residential property and building land owned in Portugal. However, for high-value villas in Quinta da Marinha, Monte Estoril or prime Estoril, AIMI should always be checked.

Can a non-resident buyer pay less IMT if they move to Portugal?

Possibly, depending on the buyer’s exact situation. Under the 2026 rules, a non-resident buyer who becomes Portuguese tax resident within two years may be able to request the cancellation of the difference between the IMT paid and the amount that would apply under the standard scale. This must be confirmed with a tax adviser before relying on it.

Should I calculate taxes before or after making an offer?

Before. In Cascais, the difference between the asking price and the real acquisition budget can be tens or hundreds of thousands of euros. A tax simulation should be done before signing the CPCV.

Get Your Real Acquisition Budget Before You Make an Offer

The examples above show a pattern worth repeating: in Cascais, the asking price is never the full picture.

A €900,000 apartment in Cascais centre may require around €74,700 in IMT and Stamp Duty. A €4.5 million villa in Quinta da Marinha may require around €373,500 in core acquisition taxes. And a €600,000 primary residence in Estoril may produce a very different tax outcome depending on whether the buyer qualifies for habitação própria e permanente treatment.

Between IMT, Stamp Duty, IMI and, for prime properties, AIMI, the gap between “list price” and “real budget” can run into tens or even hundreds of thousands of euros. It also changes depending on your residency status, how the property will be used, whether you are financing the purchase and the property’s official taxable value.

If you are still at the research stage, start with our free guide: The Complete Guide to Buying Property in Cascais & Estoril (2026). It walks you through the full purchase process, from the first viewing to the deed, including the taxes, fees and practical decisions most international buyers need to understand before buying.

Download the Free Cascais & Estoril Buyer’s Guide

If you are already looking at a specific property, the next step is to check the real numbers before making an offer.

Every property has a different VPT, and that can affect your annual IMI, potential AIMI exposure and, in some cases, the tax base used for acquisition taxes. Send us a listing you are considering — in Cascais, Estoril, Monte Estoril, Quinta da Marinha or anywhere along the Cascais line — and we will run a property-specific tax simulation before you commit.

Request Your Free Tax Simulation

At RE/MAX Cidadela, we have been based in Cascais since 2004 and have deep experience across Cascais, Estoril, Monte Estoril and the surrounding Lisbon coastline. We help national and international buyers understand not only what a property costs, but what it really costs after taxes, ownership costs and purchase structure.

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👤About the Author

By Pedro Pettermann
Pedro Pettermann is a Broker at RE/MAX Cidadela in Cascais, with over 20 years of experience in the real estate market across the Cascais coastline, Lisbon, Oeiras, and Sintra. With an MBA from IE Business School, he combines strategic vision with deep local expertise. Recognized as a specialist in the real estate market, mortgage financing, and digital marketing, he helps owners and buyers make confident and profitable decisions.

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At RE/MAX Cidadela, we have already helped more than 4,800 families successfully sell or buy the home of their dreams