Paying IMI (Imposto Municipal sobre Imóveis) in Portugal in 2026 — A Practical Guide to the 0.3%-0.45% Council Band, the VPT, the May/August/November Calendar, the IMI Familiar Deduction, the Primary-Residence Exemption and the AIMI €600,000 Threshold

The Imposto Municipal sobre Imóveis (IMI) is the Portuguese annual property tax. It is a municipal tax — every one of the 308 mainland and island councils sets its own rate inside the legal band — assessed on the Valor Patrimonial Tributário (VPT) the Autoridade Tributária (AT) attaches to each registered property, payable in one, two or three installments across the year on the basis of the size of the annual bill. For a foreign resident who has just bought or inherited Portuguese property, IMI is the recurring tax line that survives every other change: it does not depend on whether you live in the property, whether it is rented out, or whether you are Portuguese tax-resident. The Câmara of the municipality where the property sits is the recipient and the Autoridade Tributária is the operational collector. This guide is the practical walkthrough for the 2026 cycle.

Who Pays and on What

IMI is owed by whoever owns, holds the usufruto on, or is the superficiário of a Portuguese property as of 31 December of the reference year — the bill in 2026 is for the 2025 tax year and is settled on the basis of who held the property on 31 December 2025. The tax applies to every registered Portuguese property, urban or rural, regardless of whether the holder is resident in Portugal. Non-resident foreign owners pay IMI on exactly the same basis as Portuguese-resident owners — there is no foreign-owner surcharge in the IMI regime itself.

The Municipal Rate Band

The legal band for prédios urbanos (urban properties — flats, houses, offices, commercial premises) runs from 0.3% to 0.45% of the VPT, with a 0.5% ceiling in specific cases (a property held by an entity tax-resident in a jurisdição com regime fiscal mais favorável — the formal blacklist of low-tax jurisdictions — pays the maximum rate). The municipal assembly votes the council's IMI rate every year inside the band, and the choice is published in the Portaria register the AT consolidates each spring. More than half of the 308 Portuguese municipalities chose the floor rate of 0.30% for the 2026 cycle — including the Câmara Municipal de Lisboa — and the operational distribution sits more toward the floor than toward the cap. Prédios rústicos (rural land, including agricultural and forestry parcels) pay a fixed 0.8% rate, with no municipal discretion.

You can confirm the rate your municipality voted for the current year on the AT's consultar taxas IMI page at portaldasfinancas.gov.pt — filter by district and council and the page returns the urban-property rate, the rural-property rate (capped at 0.8%) and any IMI Familiar deduction the council voted in.

The VPT — Your Tax-Base Number

The Valor Patrimonial Tributário is the tax base on which IMI is calculated. It is not the market value of the property and it is not the price you paid for it: it is the formula-based value the AT calculates from the floor area, the year of construction, the location coefficient (Coeficiente de Localização, council-by-council), the quality coefficient and the use coefficient under the Código do IMI. The VPT is recorded on every property's Caderneta Predial Urbana, the official tax-card document you can pull instantly through the AT's Portal das Finanças.

Two operational notes on the VPT:

• The VPT is re-evaluated on a transmission (when a property is sold or inherited), on a major renovation, or on a triennial general-reassessment cycle the AT runs municipality by municipality. A property held without changes for years can carry a VPT meaningfully below its market value — and that gap is the lever the IMI Jovem and primary-residence exemption regimes hang off.
• The price-per-square-metre input to the VPT formula (the Vc) is set each December by Portaria of the Ministry of Finance for the following year. The 2026 Portaria revised the Vc upward for the first time in three years — modestly, but visibly — which feeds through into VPTs assessed on new transmissions and on the next reassessment cycle.

The Payment Calendar

The number of installments tracks the size of the annual bill, not the number of properties:

• Bills under €10: not collected — the AT writes the liability off.
• €10 to €100: single payment by 31 May (the 2026 deadline rolled to 1 June because 31 May fell on a Sunday).
• €100.01 to €500: two installments — the first by end-May, the second by end-November.
• Over €500: three installments — end-May, end-August, end-November.

The bill arrives by registered notification from the AT — and from the 2026 cycle the AT has phased out the traditional paper-envelope notification, with the operational delivery channel now the Portal das Finanças inbox and the e-balcão profile. Email and SMS alerts go to the contact details on the taxpayer file; if your address or contact info is out of date, you will not get the notification and the deadline still runs. Update both before May.

How to Pay

Three payment routes are available:

• Multibanco / MB Way: the AT issues a referência multibanco with the notification — entity, reference, amount. Pay through any Multibanco terminal, your bank's app, or MB Way.
• Portal das Finanças: log in with your NIF and password (or the Chave Móvel Digital), find the IMI liquidation under Bens > IMI > Notas de cobrança, and pay directly from a registered IBAN.
• Conservatórias and Loja do Cidadão: in-person payment through the AT counter at the Loja do Cidadão or a Finanças office. Less efficient but available where you have a question to raise.

The IMI Familiar Deduction

The IMI Familiar regime lets municipalities deduct a flat sum from the annual IMI bill of households with dependent children, on the family's habitação própria e permanente (the primary residence). The deduction is set by the municipal assembly inside a legal cap and runs:

• €30 for households with one dependent;
• €70 for households with two dependents;
• €140 for households with three or more dependents.

The deduction is automatically applied where the council has voted it in — Lisbon, Porto, Cascais, Sintra, Coimbra, Braga and Funchal among the larger municipalities — and is conditional on the agregado familiar being correctly registered in the AT's e-Fatura household file. If the deduction does not appear on your notification, check the household composition on Portal das Finanças first; an out-of-date dependent file is the most common cause.

The Primary-Residence Exemption

Properties used as the owner's habitação própria e permanente are exempt from IMI for three years from the year of acquisition, provided the VPT is at or below €125,000 and the agregado familiar's taxable income for the year does not exceed €153,300. The exemption has to be requested in the year of acquisition through Portal das Finanças (under Bens > Pedido de isenção de IMI) — it is not automatic. A second use of the same exemption is barred: a household that has already drawn the three-year IMI exemption on one primary residence cannot claim it again on the next.

Two adjacent regimes are worth knowing:

• Low-income exemption. Households with gross annual income at or below €16,824.50 (the 2026 threshold, indexed to 2.3 times the IAS) and a single property with VPT under €73,150 are automatically exempt — the AT runs the cross-reference off the IRS file. No application required.
• Rental-purpose exemption. Properties built or renovated specifically for rental, subject to documentation and to a Câmara green-light, can claim a three-year IMI exemption that can be extended for two further years on municipal assembly vote.

AIMI — The High-VPT Surcharge

The Adicional ao IMI (AIMI) is the wealth-style surcharge on top of the base IMI, paid annually in September on the basis of the aggregate VPT of every habitational urban property and construction-land plot the taxpayer holds on 1 January of the year. The key features for individuals:

• €600,000 personal allowance per taxpayer. The aggregate VPT below that line is exempt — and a married couple with joint property ownership can stack to a combined €1,200,000 allowance by filing jointly and electing the household-aggregate option.
• Tiered rates: 0.7% on the slice between €600,000 and €1,000,000; 1.0% between €1,000,000 and €2,000,000; 1.5% above €2,000,000 (per individual filer).
• Commercial and industrial property excluded. AIMI applies only to habitational urban property and construction-land plots — offices, factories and shops do not count toward the aggregate.

For companies the surcharge is a flat 0.4% on the aggregate VPT (no €600,000 allowance), rising to 0.7%, 1.0% and 1.5% on the personal-use slice if the company property is used by shareholders or directors. The AIMI bill arrives in September with payment due by end-September.

Disputing a VPT or an IMI Bill

If the VPT looks wrong — typically an over-assessed area, a wrong location coefficient or a stale post-renovation reading — the owner can request a reavaliação through Portal das Finanças. The request triggers an AT inspector visit and a recalculation under the Código do IMI formula. The reavaliação is free, and a reduced VPT carries forward into the next IMI cycle.

If the bill itself is wrong (wrong owner, wrong council rate, wrong installment count), the operational route is reclamação graciosa through Portal das Finanças within 120 days of notification. A failed reclamação opens the route to impugnação judicial at the Tribunal Administrativo e Fiscal — used selectively where the disputed amount justifies the legal cost.

Common Failure Modes

• Stale contact data on Portal das Finanças — the notification goes missing, the deadline runs, and the AT applies the statutory juros de mora. Update the postal address, email and phone whenever they change.
• Missing the primary-residence exemption claim. The three-year exemption is not automatic — it must be requested in the year of acquisition. Owners who paid IMI on the first year of their primary residence without claiming the exemption can request it retroactively under limited conditions but the cleaner path is to file in the right year.
• Confusing IMI with IMT. IMI is the annual property tax; the Imposto Municipal sobre Transmissões (IMT) is the one-off property-transfer tax paid at acquisition. Different rates, different timetable, different file at AT — and our recent piece on the 10% IMT penalty for IVA-6% homebuyers covers the latest tightening on that side.
• Ignoring AIMI as a non-resident with multiple Portuguese properties. The €600,000 aggregate threshold applies the same way to non-residents — and a portfolio of three €250,000-VPT flats trips the threshold without anyone noticing until the September bill arrives.
• Not updating the agregado familiar file before May. The IMI Familiar deduction reads off the household file as of 31 December the prior year; new children added late or partners not registered correctly miss the deduction.

What This Means for You

• New property buyers: claim the three-year primary-residence exemption in the year of acquisition through Portal das Finanças. The €125,000 VPT cap and the €153,300 household-income cap are the binding constraints.
• Households with children: check the council's IMI Familiar vote on the AT portal — the €30/€70/€140 deduction is automatic where voted but conditional on a correctly registered household file.
• Multi-property holders (residents and non-residents): tally aggregate VPT against the €600,000 AIMI threshold and the €1.2 million joint-couple stack before the 1 January reference date — the surcharge is on the position at year-start, not at year-end.
• Inherited properties: the new owner picks up the IMI liability from the year of transmission; the executor handles the prior-year balance and the change of taxpayer is processed automatically once the partilha is registered at the Conservatória do Registo Predial. See our Inheritance and Wills guide for the surrounding framework.
• Property renovation: a major renovation triggers a VPT reassessment; budget the higher post-renovation IMI into the project economics from day one.
• Suspected over-assessment: the free reavaliação route through Portal das Finanças is the operational answer — the request triggers an inspector visit and a fresh VPT calculation.

Sources: Código do Imposto Municipal sobre Imóveis (CIMI); Portaria 471/2025 setting the 2026 Vc; Autoridade Tributária e Aduaneira IMI rate tables for 2026; the AT IMI/AIMI FAQ on info.portaldasfinancas.gov.pt; municipal assembly resolutions on the IMI rate and the IMI Familiar deduction for the 2026 cycle.