What is AIMI and who has to pay it?

What is AIMI?

AIMI, the Adicional ao Imposto Municipal sobre Imóveis (Additional to the Municipal Property Tax), is an annual tax on higher-value property holdings¹. It is often described as a kind of property wealth tax: you only pay AIMI if the combined taxable value of your properties exceeds a certain threshold.

It is additional to (and separate from) the normal IMI. First you pay each building's IMI; then, if your property holdings are large, you also pay AIMI on the excess. You can estimate yours in our AIMI calculator.

Who has to pay AIMI?

AIMI is paid by whoever holds, on 1 January, residential urban buildings and building land whose total VPT (taxable value) exceeds the deduction¹:

• Individuals (and undivided inheritances): a €600,000 deduction.
• Legal entities: pay 0.4% on the whole VPT, with no deduction (a case our calculator does not cover).

Commercial, industrial and services buildings and rural land are outside the AIMI base, only housing and building land count.

How is AIMI calculated?

The calculation has three steps¹:

AIMI = the sum of each bracket's portion × its rate

1. Add up the VPT of all residential urban buildings and building land.
2. Subtract the deduction (€600,000 per taxpayer; €1,200,000 for a couple under joint taxation).
3. Apply the marginal rates to the remainder, like the IRS: each part pays its bracket's rate.

The rates and brackets in 2026

For an individual, above the €600,000 deduction²:

• €600,000 to €1,000,000 → 0.7%
• €1,000,000 to €2,000,000 → 1%
• Above €2,000,000 → 1.5%

For a couple under joint taxation, every threshold doubles:

• a €1,200,000 deduction;
• €1,200,000 to €2,000,000 → 0.7%;
• €2,000,000 to €4,000,000 → 1%;
• above €4,000,000 → 1.5%.

There is also an aggravated 7.5% rate on property held by entities based in tax havens, which our calculator does not include¹.

Worked example

An individual whose properties add up to €1,500,000 of VPT:

• subtract the €600,000 deduction, leaving €900,000 taxable;
• the first €400,000 (from €600,000 to €1,000,000) pays 0.7% = €2,800;
• the remaining €500,000 (from €1,000,000 to €2,000,000) pays 1% = €5,000;
• total AIMI = €7,800.

If this were a couple opting for joint taxation, the deduction would rise to €1,200,000 and the €1,500,000 would fall in the first bracket only (0.7% on €300,000), giving just €2,100. Try your own case in the AIMI calculator.

The couple's joint-taxation option

Married couples and de-facto unions can opt to be taxed jointly for AIMI¹. When they do, the deduction rises from €600,000 to €1,200,000 and the bracket limits double. For most couples with shared holdings, this greatly reduces (or even eliminates) the AIMI compared to being taxed separately. The option is made through a dedicated declaration, within a window set each year by the tax authority.

IMI and AIMI: not the same thing

It is a common mix-up. Both taxes relate to property, but in different ways:

• IMI is the annual tax on each building: VPT × the municipality's rate. See how IMI is calculated.
• AIMI is an add-on that only applies to property holdings above the deduction, at its own rates.

Those with large property holdings pay both: each property's IMI and then AIMI on the excess.

And when you sell a property?

AIMI is a tax on ownership. When you sell a property, what matters are the capital gains (the profit between purchase and sale), see capital gains on selling a property and estimate them in the property capital gains calculator.