IMI: find out what it is, who has to pay it, deadlines, exemptions and how property tax works in Portugal.

 

• IMI (Municipal Property Tax) is an annual tax paid by property owners in Portugal. It is calculated based on the property’s taxable value and the rate set by each municipality.
• Understanding how IMI works is essential for anyone looking to invest in real estate or purchase a home to live in, as it allows for informed and financially responsible decisions.
• In this article, we explain in a clear and simple way what IMI is, who must pay it, how it is calculated, payment deadlines, possible exemptions, and the main documents involved.

 

IMI is one of the most relevant taxes associated with property ownership in Portugal and, despite being part of the reality of thousands of owners, it continues to raise many questions.

For those considering buying a home or investing in real estate, understanding how IMI works is essential to assess real costs and plan a medium-to long-term budget.

In this article, we bring together all the essential information about IMI: what it is, who pays it, how it is calculated, payment deadlines, possible exemptions, and the key points to be aware of.

 

IMI: what it is and how it works

IMI (Municipal Property Tax) is an annual tax charged by Portuguese municipalities to owners of real estate located in Portugal. The tax revenue goes directly to the municipality where the property is located and helps finance local public services.

IMI is levied on the property’s taxable value (VPT – Valor Patrimonial Tributário), which is determined by the Portuguese Tax Authority (Autoridade Tributária) based on several criteria, including location, size, typology, age of the property, and construction quality.

IMI is due regardless of whether the property is occupied, rented out, or vacant, making it a permanent tax associated with property ownership.

 

Who pays IMI?

IMI is paid by whoever was the legal owner of the property on 31 December of the year preceding the tax year. This means that even if the property is sold during the following year, the IMI for that year remains the responsibility of the owner registered on that date.

In cases of co-ownership, the tax is divided proportionally according to each owner’s share. For properties held under an undivided inheritance, IMI is paid by the estate and subsequently apportioned among the heirs.

 

How to calculate IMI?

The IMI amount is calculated by multiplying the rate set by the local council by the property’s taxable value (VPT): IMI = Rate × VPT

• Taxable value (VPT): the fiscal value assigned by the Portuguese Tax Authority (Autoridade Tributária), available in the Property Tax Record (Caderneta Predial).
• IMI rate: set annually by each municipality.

 

You can find this information in the Property Tax Certificate (Caderneta Predial), available on the Portuguese Tax Authority’s online portal: Portal das Finanças.

For 2025, the IMI rates in Portugal are typically:

• Urban properties:between 0.3% and 0.45% (set by each municipality)
• Rural properties:8% (fixed rate)

 

Each municipality chooses the applicable rate, which means that properties with the same taxable value may pay different IMI amounts depending on their location.

 

When is IMI due?

IMI is paid annually, with payment deadlines depending on the total amount due:

• 31 May: if the amount to be paid is €100 or less (paid in a single instalment)
• 31 May and 30 September: if the amount is between €100 and €500 (paid in two instalments)
• 31 May, 31 August and 30 November: if the amount is more than €500 (paid in three instalments)

 

However, property owners (including foreign residents in Portugal) may choose to pay the full IMI amount in the first instalment, regardless of the total amount due.

 

How can I pay IMI?

The Portuguese Tax Authority (Autoridade Tributária) issues the IMI assessment notice, and payment can be made through various methods.

 

IMI payment methods

Once you have received your IMI assessment notice, there are several convenient ways to complete the payment:

• At ATMs (Multibanco) using the payment reference provided on your payment notice
• Online via home banking using the same reference
• Directly at CTT (post offices) or bank branches
• Through the Portal das Finanças (the Portuguese Tax Authority’s online portal) or Tax Authority offices

 

It is important to pay IMI within the applicable deadlines to avoid interest and penalties. If needed, taxpayers can contact the Portuguese Tax Authority (Portal das Finanças) for support, either in person or by phone.

 

Documents and requirements needed to pay IMI

To pay IMI, you will need the payment details provided in the assessment notice issued by the Portuguese Tax Authority (Autoridade Tributária).

If you no longer have this notice or do not have it available, the payment information can be accessed online via Portal das Finanças.

To access the Portal das Finanças, you must authenticate using one of the following methods:

• your Portuguese tax identification number (NIF) and portal access password
• the Digital Mobile Key (Chave Móvel Digital)
• or the Portuguese Citizen Card (Cartão de Cidadão)

 

Note: International investors who are not resident in Portugal typically appoint a tax representative, who can access the portal and handle IMI payments on their behalf.

 

Who is eligible for IMI exemption or reduction?

There are several situations in which property owners may benefit from a full or partial IMI exemption. The most common include:

• Temporary exemption for permanent owner-occupied housing, applicable to properties below a certain taxable value and to households with lower income levels.
• Exemption for new or rehabilitated properties, granted for a limited period.
• IMI reduction for dependants, applied by some municipalities, with a discount per dependent child.
• Permanent exemptions, applicable to specific situations provided by law, such as: properties classified as cultural heritage; properties used for public or social utility purposes; properties owned by the State, autonomous regions, or local authorities.

 

Conditions vary, and in some cases, the exemption must be formally requested by the owner within the legally established deadlines.

 

Legal deadlines to apply for IMI exemptions

The legal deadlines to apply for IMI exemptions depend on the type of exemption. The most relevant cases are outlined below:

 

IMI exemption for permanent owner-occupied housing (temporary exemption)

• Deadline: up to 60 days after the property acquisition date, or up to 60 days after the property is designated as permanent residence (if this occurs later).
• How it works: this exemption is not automatic in many cases and must be requested by the owner via the Portuguese Tax Authority’s online portal (Portal das Finanças). If the request is not submitted within the 60-day period, the right to the exemption may be lost.

 

Permanent exemption due to low income

• Deadline: no application deadline applies, as this exemption is granted automatically by the Tax Authority based on declared income and registered assets.
• Important note: taxpayers must ensure their tax information is up to date (tax address, household composition, etc.).

 

Exemption for urban rehabilitation or rehabilitated properties

• Deadline: the application must be submitted after completion of the works, within the timeframe defined by the municipality or the Tax Authority (usually up to 60 days after the use permit is issued or after completion of the works).
• Important note: deadlines may vary depending on municipal regulations, so confirmation on a case-by-case basis is recommended.

 

Can you request a review of your IMI value?

Yes, you can request a review of your IMI value. If you believe that the taxable value (VPT) of your property does not accurately reflect its characteristics or current market conditions, you may request a revaluation from the Portuguese Tax Authority.

This request is free of charge and may be submitted every three years, provided that no changes or alterations have been made to the property that could affect its valuation.

The revaluation request can be made in person at a local tax office or online via the Portal das Finanças. When submitting the request online, the process typically involves:

• logging into the Portal das Finanças
• accessing the Municipal Property Tax (IMI) section
• completing and submitting the Model 1 declaration, using the property details available in the Property Tax Record (Caderneta Predial)

 

After submission, the Portuguese Tax Authority has up to 180 days to issue a response.

 

IMI: frequently asked questions

Below, we answer some of the most common questions about IMI.

 

Is IMI paid every year?

Yes. IMI is an annual tax, payable as long as the property exists and has a registered owner.

 

Does IMI automatically increase every year?

Not necessarily. The amount may change if the taxable value is updated, the municipal rate changes, or the property’s characteristics are altered.

 

Does a homebuyer pay IMI in the first year?

It depends on the purchase date. IMI is due by whoever was the owner on 31 December of the previous year, so payment in the first year may or may not apply.

 

Does IMI apply to investment properties?

Yes. Properties held for rental or investment purposes are subject to IMI and this cost should be considered when analysing investment returns.

 

IMI and informed property decisions with Vantage Group

At Vantage Group, we support our clients from property selection through to cost analysis, helping assess tax impact and identify opportunities that make sense in the long term. Whether you are investing or buying a home to live in, our developments are designed to deliver value, security and peace of mind.