If you own property in Portugal, the short answer is that IMI is charged on the previous calendar year, with the annual bill issued in spring and payment due at the end of May and, for larger amounts, additionally in August and November. This guide explains exactly when IMI is due in Portugal in 2026, who has to pay it, how it is calculated, and the points that catch foreign and non-resident owners out, in particular receiving the payment notice and settling it from abroad.
What IMI is
IMI (Imposto Municipal sobre Imóveis) is the annual municipal property tax, governed by the Código do IMI (CIMI), approved by Decreto-Lei n.º 287/2003. It is charged on the registered tax value of property in Portugal, the Valor Patrimonial Tributário (VPT), at a rate set each year by the municipality where the property sits. The VPT is fixed by the Tax and Customs Authority (AT) using a statutory formula that weighs location, size, age, type of use and construction quality. IMI applies to residents and non-residents alike: nationality and tax residence make no difference to the liability.
When is IMI due in Portugal
IMI is assessed in arrears, for the previous calendar year, and paid the following year. The AT assesses the tax between February and April (Article 113.º of the CIMI) and issues the annual bill (the documento de cobrança) in time for payment at the end of May. The payment calendar, set out in Article 120.º of the CIMI, depends on the total amount due:
- 100 euros or less: a single payment by 31 May.
- More than 100 and up to 500 euros: two instalments, by 31 May and 30 November.
- More than 500 euros: three instalments, by 31 May, 31 August and 30 November.
A taxpayer who prefers not to pay in instalments can settle the full amount in May, using the reference shown on the notice. The thresholds and months are the same wherever the property is located in Portugal, including Madeira and the Azores.
Who owes IMI, and for which year
Under Article 8.º of the CIMI, IMI is charged to whoever owned the property on 31 December of the year to which the tax relates. Ownership on that date is what counts, not occupation or how long you held the property during the year. So the IMI payable in 2026 is the tax for 2025, charged to the person who owned the property on 31 December 2025. If you buy or sell during the year, the liability for that year falls on whoever held title at the year end, which is a point worth settling in the sale terms rather than assuming a pro rata split.
How much IMI costs
The rate is set annually by each municipal assembly within the bands fixed in Article 112.º of the CIMI:
- Urban property: between 0.3 per cent and 0.45 per cent of the VPT.
- Rural (rustic) property: 0.8 per cent of the VPT.
The tax is the VPT multiplied by the municipal rate. As an illustration, an urban property with a VPT of 250,000 euros in a municipality applying 0.3 per cent produces IMI of 750 euros for the year, payable in three instalments because it exceeds 500 euros. Because the rate varies by council, two similar properties in different municipalities can carry different bills, and the rate set by the specific municipality can be checked on the Portal das Finanças.
Higher rates can also apply as exceptions to these base bands. The law allows a multiple of the rate for vacant or derelict urban property, a penal rate of 7.5 per cent for owners resident in jurisdictions on the Portuguese blacklist, and municipal surcharges in designated urban-pressure zones, each depending on central legislation and municipal decisions. These are exceptions rather than the norm, but a non-standard property should be checked against them.
AIMI: the additional tax on higher-value holdings
Owners of more valuable residential property should also account for AIMI (Adicional ao IMI), a separate top-up tax under Articles 135.º-A and following of the CIMI. For individuals, AIMI applies to the part of the combined VPT of Portuguese residential property that exceeds 600,000 euros, with a 1,200,000 euro allowance available to married or de facto couples who opt to be assessed jointly. Broadly, the individual rates are 0.7 per cent on the value above the allowance, 1 per cent on the part above 1,000,000 euros, and 1.5 per cent on the part above 2,000,000 euros, with a flat rate for property held through companies. AIMI runs on its own calendar: it is assessed in June and paid in September, separately from IMI. For an owner with a single moderate property it does not arise; for a larger portfolio it should be planned for.
What foreign and non-resident owners need to watch
The liability is identical for non-residents, but the practical mechanics are where problems occur.
First, you need a Portuguese tax number (NIF), without which the property cannot properly be registered to you and the tax cannot be processed. Second, owning property creates a tax relationship, so the AT must be able to reach you: owners resident outside the EU and EEA must either appoint a fiscal representative in Portugal (Article 19.º of the General Tax Law) or, since Decreto-Lei n.º 44/2022, adhere to the AT’s electronic notification channels as the accepted alternative. EU and EEA residents are not obliged to appoint a representative, but should still keep their registered address or electronic mailbox monitored.
Third, and most important in practice, the IMI notice is issued to your registered fiscal address or electronic mailbox. If you live abroad and that address is out of date, or you are not monitoring the Portal das Finanças, you may never see the notice, and not receiving it does not postpone the deadline or excuse late payment. Many non-resident owners only discover a missed instalment once interest has accrued. Keeping the registered address current, and ideally having a representative monitor the account, avoids this entirely.
Finally, payment from abroad is straightforward once you can see the reference. IMI can be paid through the Portal das Finanças, by Multibanco or ATM, through Portuguese home banking, or at a tax office or CTT counter, using the reference on the notice. A fiscal representative can also settle it on your behalf.
Exemptions
Some relief exists, though most of it is aimed at residents. A temporary IMI exemption is available for a low-value permanent own home (habitação própria e permanente) under Article 46.º of the Estatuto dos Benefícios Fiscais, subject to VPT and household-income limits, and a permanent exemption applies to very low-value homes held by low-income households under Article 11.º-A of the CIMI. Both turn on the property being the owner’s permanent dwelling, and the low-value relief is in any case excluded for property held by non-residents (Article 11.º-A, no. 4). A non-resident owner of a holiday home or rental property in Portugal will therefore generally not qualify, and for several reliefs non-residence excludes entitlement at the outset. These reliefs are subject to detailed statutory conditions on property value, household income and, in some cases, tax residence, so whether a particular owner qualifies should be checked against the law in force for the relevant year.
Penalties for paying late
Missing an instalment triggers compensatory interest and can lead to a penalty under the General Regime of Tax Infringements (RGIT), and ultimately to enforced collection. The amounts are usually modest if corrected quickly, but they are entirely avoidable. The safeguard is simple: know the May, August and November dates, make sure the notice can reach you, and diarise the instalments.
How MCS can help
MCS can act as fiscal representative for non-resident property owners, monitor the Portal das Finanças for IMI and AIMI notices, confirm the VPT and the municipal rate applied, check any exemption entitlement, and ensure each instalment is paid on time, subject to a review of your circumstances. For owners managing a Portuguese property from abroad, that ongoing oversight is usually the difference between a predictable annual cost and an avoidable penalty.
This article is provided for general information only and reflects the IMI and AIMI rules in force in Portugal during 2026 at the date of publication. It is not legal or tax advice, does not take account of any particular person’s circumstances, and should not be relied upon as a substitute for professional advice. IMI rates are approved annually by each municipality, and the statutory thresholds, reliefs and deadlines summarised here may change; the consolidated legislation referenced in the sources below governs in the event of any discrepancy with this text. Reading this article does not create a client relationship, and MCS accepts no liability for any action taken, or not taken, in reliance on it. Before acting on any point above, you should obtain advice on your specific property and tax position. MCS can assist, subject to a review of your circumstances and a formal engagement.
Miguel Pinto-Correia holds a Master Degree in International Economics and European Studies from ISEG – Lisbon School of Economics & Management and a Bachelor Degree in Economics from Nova School of Business and Economics. He is a permanent member of the Order of the Economists (Ordem dos Economistas)… Read more
