IMI Explained: How Portugal's Property Tax Works and How to Pay It

• IMI is an annual municipal tax on the VPT (taxable patrimonial value) of property you own in Portugal, not on its market price.
• Urban-property rates run 0.3%–0.45%, set every year by each município within that legal band — rural land is a flat 0.8%.
• AT bills you in the spring based on who owned the property on 31 December of the previous year, payable in 1 to 3 instalments depending on the amount.
• A primary permanent residence can qualify for an IMI exemption, either a temporary one for a newly built/renovated home or a permanent one for low-income households.

IMI (Imposto Municipal sobre Imóveis) is Portugal's annual property tax, charged on urban and rustic buildings located in Portugal. It's set out in the Código do IMI, approved by Decreto-Lei n.º 287/2003. The Autoridade Tributária (AT) assesses and collects it, but the money goes to the município where the property sits — which is also why the rate isn't the same everywhere.

What IMI is actually charged on

IMI isn't calculated on what you paid for the property or what it would fetch on the open market. It's charged on the VPT (valor patrimonial tributário) — a tax value AT derives from a formula covering built area, location, quality and comfort, and the age of the building. The VPT is usually lower than market price, sometimes considerably so, which is part of why two similarly priced homes can carry very different IMI bills.

Rates: rural is fixed, urban is a municipal choice

• Rural property (prédios rústicos): a fixed 0.8% of VPT.
• Urban property (prédios urbanos): the law sets a band of 0.3% to 0.45% — each município's assembly picks the rate that applies in its area for the year, and can even vary it by freguesia.
• The rate you actually pay depends entirely on where the property is — always confirm the current rate for your município on the Portal das Finanças or the DGAL's Portal Autárquico rather than assuming a single national figure.
• Municipalities also have levers to raise or lower the bill in specific cases — for example, a rate up to three times higher on long-vacant or derelict urban buildings, or reductions tied to number of dependants — so don't be surprised if your neighbour's rate differs from yours for reasons beyond the VPT.

Who's liable, and for which year

Whoever owns, holds usufruct over, or has a right of surface on a property on 31 December of a given year is the one liable for that year's IMI — in full, even if they sell the property the following week. If you're closing a sale near year-end, this is worth negotiating explicitly in the promissory contract, since the tax follows the calendar date, not the number of months owned.

How and when IMI is billed and paid

1. 1
   AT calculates your VPT

   The Autoridade Tributária (AT) values your property using the VPT formula — built area, location, quality/comfort, and age coefficients — to arrive at the valor patrimonial tributário, the tax base IMI is charged on.

2. 2
   You're notified of the amount due

   AT issues the collection note (nota de cobrança) based on the VPT and the rate your município applies that year, generally in April, covering the property you owned on 31 December of the previous year.

3. 3
   A DUC payment reference is issued

   Your payment reference (DUC) becomes available on the Portal das Finanças, showing the total due and how it's split across instalments.

4. 4
   You pay in 1, 2, or 3 instalments

   How many instalments you get depends on the total bill: up to €100 is paid in a single instalment in May; €100.01–€500 splits across May and November; above €500 splits across May, August, and November.

5. 5
   Check your VPT — and appeal it if it looks wrong

   If you think your VPT is out of line with the property's market value, you can request a second avaliação within 30 days of being notified of it, or ask for a periodic re-evaluation every three years.

Non-residents typically settle via direct debit from a Portuguese bank account, or by paying the DUC reference through homebanking, Multibanco, or a bank counter. If you're not resident and don't already have one, you'll generally need a fiscal representative to receive and act on the AT's notifications.

IMI exemption for a primary permanent residence

Portugal offers two distinct routes to an IMI exemption on a primary home — they're not the same benefit, and only one usually applies to any given household:

• Temporary exemption for a newly built, acquired, or improved home: available for up to 3 years when the property is your habitação própria e permanente, its VPT is below the legal ceiling, and your household's taxable income in the prior year is under the income ceiling. You must move in within 6 months and request the exemption within 60 days of doing so — it isn't automatic.
• Permanent exemption for low-income households: an automatic exemption (residents only) when your household's gross income doesn't exceed 2.3 times the annual value of the IAS (indexante dos apoios sociais), and the combined VPT of every rustic and urban property your household owns doesn't exceed 10 times that same annual IAS value.

Both ceilings move with the IAS and with each year's State Budget, so confirm the current euro thresholds on the Portal das Finanças before assuming you qualify — don't rely on a figure from a previous tax year.