Property Tax in Portugal in 2026: A Practical Guide to IMI, AIMI, IMT, the May Payment Calendar and the Capital-Gains Treatment for Residents and Foreign Owners

Owning property in Portugal in 2026 means tracking four separate taxes that can land on the same cadastral parcel in the same calendar year, each with its own filing flow, exemption regime and payment calendar. The May payment window for the annual Imposto Municipal sobre Imóveis (IMI) opens this month, the parallel Adicional ao IMI (AIMI) high-value surcharge runs on its own September window, the one-off Imposto Municipal sobre Transmissões Onerosas de Imóveis (IMT) attaches at every purchase and the capital-gains line through the IRS or IRC return crystallises at every sale. This guide walks the four pieces, the 2026-vintage figures that the OE 2026 set, the exemption regimes that foreign owners most often miss and the practical workflow inside the Portal das Finanças that ties the whole stack together.

The four-tax stack at a glance

• IMI — annual recurrent tax on the patrimonial value of the property; paid every year while the property is owned; rate set municipally inside a national band; primary lever for residents and foreign owners alike.
• AIMI — annual surcharge on the cumulative patrimonial value of all urban residential, urban commercial and construction-land parcels held by the same taxpayer above a high-value threshold; affects roughly 100,000 individual taxpayers and a wider corporate-holdings universe.
• IMT — one-off transmission tax paid by the buyer at the moment of acquisition; separate progressive scale with a primary-residence exemption ceiling and a separate, much wider IMT Jovem under-35 exemption regime introduced in 2024 and updated annually.
• Capital gains — taxed under the IRS Categoria G regime for individuals (50% inclusion for residents, full inclusion or progressive-rate option for non-residents post-2023 CJEU ruling); reinvestment exemption available for primary-residence proceeds rolled into a new primary residence.

The four taxes connect through the same Portal das Finanças identifier — the property's artigo matricial (cadastral article number) and its Valor Patrimonial Tributário (VPT, taxable patrimonial value), set in 2026 against a national reference price of €570 per square metre that the CNAPU (Comissão Nacional de Avaliação de Prédios Urbanos) fixed in late December 2025.

IMI — the annual line

Rates

IMI rates for 2026 are set municipally within a national band. For urban properties — residential housing, commercial premises, industrial premises and construction land — the rate sits between 0.3% and 0.45% of the VPT in the standard regime, with a special permission for municipalities to raise the band ceiling to 0.5% for parcels meeting certain triggers. For rural properties — agricultural, forestry, livestock and nature-conservation land — the rate is fixed at 0.8% of the VPT, with municipal councils retaining the option to triple the rate to 2.4% for parcels of abandoned forestland (subject to a €20-per-property minimum charge). Each municipality publishes its annual rate in the Diário da República supplementary issue every December; the AT (Autoridade Tributária) consolidates the national table at portaldasfinancas.gov.pt.

Payment calendar — the May–November window

The 2026 IMI payment calendar runs to the same April-Notification, May-First-Instalment, August-Second-Instalment, November-Third-Instalment cadence that AT has used since the 2018 reform of the recurrent property-tax flow. The instalment split depends on the total annual liability for the parcel:

• Annual IMI under €10: AT does not raise the assessment.
• €10 to €100: single payment, due by 31 May.
• €100 to €500: two instalments — first by 31 May, second by 30 November.
• Over €500: three instalments — May, August, November (typically 31 May / 31 August / 30 November).

The April notification arrives this year through the AT digital channel rather than the legacy postal envelope — a 2026 administrative change for the IMI flow that AT flagged in its annual taxpayer note. Owners with the Portal das Finanças mobile-on-file and ViaCTT digital-mailbox properly registered should receive the assessment as a Portal-das-Finanças notification; owners on the legacy postal track need to opt into the digital channel to avoid a missed-notification cycle. The payment dates have not changed.

Exemptions — primary residence, low income, urban rehabilitation

The principal IMI exemption is the permanent-residence ceiling: properties acquired and used as the owner's permanent residence are exempt from IMI for three years from the deed-signature date, provided the parcel's VPT does not exceed €125,000 (a ceiling unchanged since 2012). Municipal assemblies retain the option to extend the exemption by up to two additional years. The same three-year exemption flows on construction land destined for permanent housing and on properties acquired or rehabilitated for permanent rental.

The low-income exemption for 2026 is automatic if the taxpayer filed the prior-year IRS return on time and meets two thresholds: family gross income for the prior year at or below €16,824.50 and total property value (rural and urban combined) at or below €73,150. The exemption applies regardless of any outstanding tax or Social Security debts.

The pre-1990 frozen-rent exemption covers landlords with rental contracts pre-dating the NRAU (Novo Regime do Arrendamento Urbano) where the family-income ceiling sits at €153,300; the exemption is granted up to twice on a temporary basis. Separate urban-rehabilitation exemptions apply where the parcel sits inside a municipally-designated Área de Reabilitação Urbana (ARU) and the owner has completed certified rehabilitation works.

An energy-efficiency reduction applies for properties with an A or A+ energy certificate where the municipality has elected to apply the IMI Familiar / Habitação Eficiente reduction band. The reduction stacks on top of the IMI Familiar regime — a separate municipally-elective discount of €30 per dependent (one), €70 (two), €140 (three or more) — that around 270 of Portugal's 308 municipalities apply.

The joint-filing election deadline

Couples who want to opt in or out of joint AIMI taxation for the year (which doubles the first-bracket exemption to €1.2 million) had to make the election by 2 March 2026 inside the Portal das Finanças. The deadline is now closed for tax year 2026; the next election window opens in early 2027 for tax year 2027.

AIMI — the high-value surcharge

The Adicional ao IMI is the high-value surcharge layered on top of the standard IMI line for taxpayers whose cumulative patrimonial value of urban residential, urban commercial and construction-land parcels in Portugal sits above the high-value threshold. It runs on a calendar-year basis with the assessment notification arriving in June and the payment due in September each year. AT's 2026 estimate puts AIMI revenue at €162.6 million, up from €155.7 million in 2025.

Thresholds and progressive rates

• Individual taxpayers: €600,000 first-bracket exemption.
• Married couples / civil partners electing joint AIMI: €1,200,000 first-bracket exemption.
• Estates of deceased persons (heranças indivisas): €600,000 first-bracket exemption (treated as an individual for AIMI purposes).
• Corporate holdings: AIMI applied at a flat 0.4% on the full patrimonial value of urban residential, urban commercial and construction-land assets, with no exemption threshold; a 7.5% surcharge applies to corporate parcels held by entities with seat in tax-haven jurisdictions per the Portuguese black-list regime.

The progressive AIMI scale for individuals (and joint-filing couples on doubled brackets) runs:

• 0.7% on the slice from the first-bracket threshold up to €1 million (single) / €2 million (joint).
• 1% on the slice from €1 million to €2 million (single) / €2 million to €4 million (joint).
• 1.5% on the slice above €2 million (single) / €4 million (joint).

AIMI applies only to parcels classified as urban residential (T-codes), urban commercial (S-codes) or construction land (T-codes for housing). Rural land, urban industrial parcels and parcels classified as «serviços» under the matricial code are excluded from the AIMI base.

IMT — the one-off transmission tax

IMT is the buyer-side transmission tax payable at the moment of deed signature on every onerous transfer of Portuguese real estate. The OE 2026 lifted the IMT brackets by 2% relative to 2025 (in line with the 2025 IPC update); the standard rates (2% / 5% / 7% / 8%) and the headline structure remained unchanged. The full progressive scale runs through six brackets for residential urban property destined for permanent residence:

• Up to €106,346: 0% (full exemption for permanent residence).
• €106,346 to €145,524: 2% marginal rate.
• €145,524 to €198,431: 5% marginal rate.
• €198,431 to €330,539: 7% marginal rate.
• €330,539 to €660,982: 8% marginal rate.
• Above €660,982: 7.5% flat rate on the full purchase price (replacing the marginal-rate calculation above the cap).

For urban property destined for second home / non-permanent residence, the same bracket grid applies but without the €106,346 zero-rate exemption — the 2% marginal rate kicks in from €1 of purchase price. For rural property the IMT rate is a flat 5% of the purchase price. For urban land destined for construction or other urban property without a primary-residence destination, the IMT rate is a flat 6.5% of the purchase price.

The IMT Jovem under-35 exemption regime

The 2024 reform created a separate, much wider IMT exemption for buyers under 35 acquiring their first permanent residence. The 2026 regime sets:

• Full IMT exemption on permanent-residence purchases up to €330,539.
• Partial IMT relief on the slice between €330,539 and €660,982.
• No relief above €660,982.

Eligibility runs to three triggers: (i) the buyer (and their spouse or civil partner if jointly buying) must be under 35 at the deed date, (ii) IRS-independent at the time of the transaction (i.e., not a dependent on a parent's IRS return for the acquisition year), and (iii) not have been owner or co-owner of any urban residential property anywhere in Portugal in the three years preceding the deed. The IMT Jovem regime stacks with the Imposto do Selo exemption on the same transaction (the 0.8% stamp duty on the purchase-price line is also exempt).

The Imposto do Selo line

Imposto do Selo (Stamp Duty) on a property purchase is a separate flat 0.8% line on the purchase price, payable on the same deed date, with the same payment workflow inside the Portal das Finanças as IMT. For mortgage-financed purchases, an additional 0.6% Imposto do Selo applies to the mortgage principal (for terms under five years) or 0.5% (for terms five years or longer). For the IMT-Jovem-eligible cohort, the 0.8% stamp duty on the purchase-price line is also exempt up to the same €330,539 ceiling.

Capital gains on sale

The capital-gains treatment depends on the seller's tax-residency status and on whether the sale is of a primary residence with reinvestment.

Resident sellers

For Portuguese tax residents (including foreign nationals tax-resident in Portugal), the capital gain on a non-primary-residence property sale is included at 50% of the realised gain in the IRS Categoria G base and taxed at the seller's marginal IRS rate (running from 13% at the lowest bracket to 48% at the top bracket, plus the 2.5%/5% solidarity surcharge for high-income brackets). The taxable gain is the sale price net of acquisition cost (uplifted by the AT-published inflation coefficient for the holding period if held more than 24 months), net of documented sale expenses (estate-agent commission, energy-certificate fees, legal-and-deed costs, capital-improvement works invoiced with NIF) and net of the IMT and Imposto do Selo originally paid on acquisition.

For sales of a primary residence with full reinvestment in another primary residence inside the EU/EEA within 24 months before or 36 months after the sale, the gain is fully exempt. Partial reinvestment yields a proportional exemption. The 2024 reform extended the reinvestment-exemption regime to include reinvestment of the proceeds in qualifying retirement-savings products (Planos Poupança Reforma — PPR) for sellers above 65; this regime requires the seller to opt in inside the IRS return for the sale year.

Non-resident sellers

The non-resident regime was substantially reshaped by the 2023 CJEU ruling in MK (Case C-388/19) and the subsequent OE 2023 transposition. Non-residents now have two options: (i) the legacy regime — full inclusion of the gain (100% rather than 50%) at a flat 28% rate; or (ii) the optional regime — election to include the gain at 50% and taxed at the progressive IRS rate the seller would pay if tax-resident in Portugal, computed as if the seller's worldwide income had been earned in Portugal (the so-called «englobamento mundial» election). Most non-resident sellers below the upper IRS brackets benefit from electing option (ii).

Corporate sellers

For corporate property holdings, the gain is included in the IRC Categoria taxable base at 100% and taxed at the standard IRC rate (20% on the first €50,000 of taxable income for SMEs, 21% above that band, plus state and municipal surcharges that can take the marginal rate to 31.5% for the largest holdings).

The NIF, the Portal das Finanças and the IBAN

Every property transaction in Portugal — purchase, sale, rental, inheritance — runs through the Portuguese Tax Identification Number (Número de Identificação Fiscal — NIF, also known as Número de Contribuinte). Foreign owners need a Portuguese NIF before they can sign a deed; non-EU/EEA-resident owners need a NIF representative (the «representante fiscal» figure) registered alongside the NIF unless they elect for the digital-channel-only relationship with AT introduced in 2022.

The Portal das Finanças mobile-on-file is the practical workflow anchor: every IMI assessment, every AIMI assessment, every IMT settlement and every capital-gains-related notification arrives through it. Foreign owners should keep the contact mobile and the contact email updated and should opt into the ViaCTT digital-mailbox channel so that the April IMI notification (now digital-first in 2026) does not get missed.

For payment, the Portal des Finanças generates an MB (Multibanco) reference and a fixed payment amount that the owner can settle through any Multibanco ATM, any Portuguese-bank online-banking interface or the MB Way mobile app. Owners on a foreign IBAN can also settle through SEPA bank transfer to AT's payment account using the same MB reference as the SEPA reference field; AT processing typically reconciles the SEPA inflow within 48 hours of receipt.

NHR / IFICI and other special regimes

The Non-Habitual Resident (NHR) regime closed to new applications at the end of 2023; existing NHR-status holders retain the regime for the full 10-year window from their grant date. The replacement regime — the Incentivo Fiscal à Investigação Científica e Inovação (IFICI), introduced in 2024 — does not change the property-tax treatment for the qualifying cohort. Both regimes leave IMI, AIMI and IMT untouched: the NHR / IFICI status reduces tax exposure on Portuguese-source IRS Categoria A and B income and on certain foreign-source passive income, but does not modify the property-tax stack. Foreign property buyers planning around an NHR / IFICI status still pay the full IMT at deed signature, the full annual IMI on the patrimonial value and the full AIMI surcharge if their cumulative holdings cross the threshold.

Common pitfalls for foreign owners

• Missing the digital notification. The 2026 switch to digital IMI notifications means owners who have not registered their mobile and email contact with AT may receive no IMI assessment at all — and the late-payment penalty regime (1.0% per month, capped at 12 months, plus default interest at the AT statutory rate) starts running from 1 June regardless of whether the notification was actually received.
• Mis-classifying the property destination. Buyers who declare the property as primary residence at deed signature to capture the IMI three-year exemption and the IMT permanent-residence brackets but then list it on Airbnb or as a long-term rental within the three-year window trigger a retroactive IMT and IMI re-assessment. AT cross-checks against AT-issued AL (Alojamento Local) registrations and the IRS Categoria F rental-income line.
• Forgetting the reinvestment 36-month clock. Resident sellers who claim the primary-residence reinvestment exemption have 36 months from the sale date to complete the reinvestment in another primary residence; failure to complete inside that window triggers a retroactive capital-gains assessment with default interest from the original sale date.
• Mis-electing the non-resident capital-gains regime. Non-resident sellers electing the legacy 100%-inclusion-at-28%-flat regime when the optional englobamento-mundial regime would have produced a lower tax bill. The election is made inside the IRS Modelo 3 return for the sale year and is revisable up to the AT-published rectification deadline.
• Treating AIMI and IMI as one bill. AIMI lands in September on its own assessment notification, separate from the IMI May / August / November assessment notifications. The AIMI bill is not deductible against the IMI bill for the same parcels — they stack.

Where to verify the 2026 figures

The authoritative reference for every figure in this guide is the Portal das Finanças at portaldasfinancas.gov.pt — specifically the IMI consultation page (which holds the per-municipality 2026 rate table for all 308 Portuguese municipalities) and the IMT calculator (which produces a per-transaction IMT estimate from a purchase-price input). The Diário da República at dre.pt holds the underlying decree-laws and OE 2026 transposition for the IMT scale and the AIMI brackets. The municipal IMI rate is published in the supplementary Diário da República December issue each year and is also available on each city or town hall's website.

Foreign owners with material exposure across multiple parcels — particularly across the AIMI threshold or with cross-border capital-gains complexity — should engage a Portuguese fiscalista (tax adviser) for the AIMI joint-filing election, the capital-gains-on-sale workup and the IRS Modelo 3 filing. The Portal das Finanças workflow handles the per-parcel mechanics, but the optimisation of the four-tax stack (election timing, reinvestment scheduling, NIF-representative arrangements) typically benefits from professional support.

Sources: Portal das Finanças IMI consultation page (Tier 1 AT primary), Diário da República OE 2026 (Tier 1 primary), ECO 9 October 2025 (IMT 2026 bracket update), Público 9 October 2025 (OE2026 IMT Jovem update), Público 26 December 2025 (CNAPU 2026 €570/m² reference price), ECO 2 May 2026 (IMI payment-window reminder, Saturday note). Tier 1 AT and DRE primary; Tier 2 PT corroboration on the OE 2026 IMT and IMT Jovem brackets.