🏠 Portugal IMI Calculator

The Imposto Municipal sobre Imóveis (IMI) is Portugal's annual municipal property tax, charged every year to whoever owns a property on 1 January. It works like the Spanish IBI or the German Grundsteuer, and after the IRS surcharge it is the second-largest source of municipal revenue in the country. Crucially, IMI is not calculated on the price you paid for the property: the base is the valor patrimonial tributário (VPT), the taxable patrimonial value that the tax authority assigns to each parcel.

You will find the VPT on the caderneta predial — the property tax record you can download from the Portal das Finanças for every property you own. Urban buildings (prédios urbanos: apartments, houses, shops and building land) are taxed somewhere between 0.30% and 0.45% of the VPT, while rustic properties (prédios rústicos: agricultural, forestry or grazing land) pay a flat 0.8%. Each municipal assembly fixes its own rate inside the legal band every year, so two identical apartments in neighbouring municipalities can carry noticeably different bills.

On top of the annual IMI, high-value residential urban property attracts the Adicional ao IMI (AIMI), a surcharge introduced in 2017. This calculator estimates the standard IMI for both property types, converts it into a monthly equivalent, previews the installment plan and flags the €600,000 AIMI threshold for individual owners. If you also pay tax on Portuguese income, our Portugal IRS calculator covers the other side of the ledger.

The engine behind this tool is the single statutory formula defined in the Código do IMI: IMI = VPT × municipal rate. There is no progressive scale and no deduction — the tax is a straight multiplication, which is why a clean, current VPT from your caderneta predial matters far more than any calculator trick.

Choosing the rate. For urban property, pick the rate your câmara municipal published for the year: the dropdown offers the common presets from 0.300% to 0.450% in 0.025 steps, plus a custom field for anything in between. For rustic property the law fixes a single 0.8% rate, so the calculator applies it automatically and ignores the dropdown. Municipalities may adjust their rate annually within the legal band, and the assembly's decision applies to the whole following year.

Derived metrics. Beyond the annual figure, the tool computes a monthly equivalent (annual IMI ÷ 12) so owners and landlords can spread the cost across twelve months of budget or rental income, and an installment estimate following the common rule: up to €100 the IMI is collected in a single installment, between €100 and €500 in two, and above €500 in three payment windows (May, August and November of the same year). Exact due dates vary by municipality, so treat the schedule as indicative.

AIMI check. If the VPT of a residential urban property exceeds €600,000 for an individual owner, the tool applies the AIMI progressive scale — 0.7% on the portion from €600,000 to €1,000,000, 1.0% from €1,000,000 to €2,000,000, and 1.5% above €2,000,000. Companies pay a flat 0.4% on the total residential VPT and offshore entities 7.5% — the reference table below lists every tier, but only the individual rule is computed here, and the surcharge is normally billed separately in September of the following year. Landlords should remember that IMI interacts with rental income declared through recibos verdes, while purchase-time VAT is covered in the Portugal IVA calculator.

The statutory framework below applies for 2026: the Código do IMI fixes the outer limits, and each municipal assembly chooses its own urban rate inside the band every year. The AIMI tiers show who pays the surcharge on residential urban property; only the individual rule is computed by the calculator above.

All six examples below come from the calculator on this page (urban property, individual owner) — every figure can be reproduced by entering the same VPT and rate. Amounts are rounded to two decimals, and the installment column follows the common rule described above.

1. Download the caderneta predial from the Portal das Finanças and copy the VPT of your property.
2. Select the property type: urban (urbano) or rustic (rústico).
3. Pick your municipality's IMI rate from the presets, or enter a custom rate between 0.300% and 0.450%.
4. Press Calculate IMI to see the annual tax, the monthly equivalent and the installment estimate.
5. Read the AIMI line: for an individual owner, a VPT above €600,000 triggers the progressive surcharge (0.7% / 1.0% / 1.5%) on the excess.

Where exactly do I find the VPT used by this calculator?

In the caderneta predial of the property, which you can open in your Portal das Finanças account under the patrimony section. The field is labelled valor patrimonial tributário. For apartments it covers the building and its share of the land; for rustic plots it is the land value. The calculator needs the total VPT exactly as printed on the current-year document.

Why can the rate differ between two neighbouring municipalities?

Because each municipal assembly fixes its own IMI rate annually within the legal band of 0.30% to 0.45% for urban property. The decision must be published by 31 December and applies to the following year. Municipalities facing severe population loss are allowed to set rates outside the standard band, which is exactly why the custom-rate field exists in the calculator.

How is the Adicional ao IMI (AIMI) calculated?

For individual owners, the AIMI is progressive on the combined VPT of residential urban property above €600,000: 0.7% on the portion from €600,000 to €1,000,000, 1.0% from €1,000,000 to €2,000,000 and 1.5% above €2,000,000, so only the excess is taxed. Companies pay a flat 0.4% on the whole residential VPT and offshore entities 7.5%. This tool computes only the individual rule and flags the threshold; the surcharge is assessed separately and normally falls due in September of the year after the ownership assessment date.

When and how do I pay the IMI?

Under the standard rule, amounts up to €100 are paid in a single installment (May), amounts from €100 to €500 in two (May and November) and amounts above €500 in three (May, August and November). Exact due dates appear on the assessment notice, and payment works at Multibanco ATMs, home banking or directly in the Portal das Finanças.

Can I be exempted from IMI on my own home?

Yes, if the property is your permanent residence, its VPT does not exceed €125,000 and your household taxable income stays below €153,300 per year. The exemption must be requested from the tax office and is granted for three years, renewable on reapplication. Low-value rustic properties farmed directly by their owners can also qualify for reduced rates or relief.

Does the IMI change when the property is sold or revalued?

The tax follows the property, not the transaction: the buyer pays IMI from the first full year of ownership based on the registered VPT, and a sale does not reset that value. Renovation works that change the building's characteristics can trigger a new assessment, and municipal revaluation cycles update values periodically, so the bill can move years after the purchase.

This tool is for informational purposes only and does not constitute financial advice. Consult a qualified financial professional for advice specific to your situation.

Check the VPT every year instead of reusing an old caderneta predial: the tax authority updates values for currency depreciation and municipalities run periodic revaluation cycles, so the taxable value can move even when your property does not. If you believe the VPT is too high — for example after a market downturn or because the building's characteristics are recorded incorrectly — you can request a new assessment, and every euro of VPT you shave off lowers each future IMI bill permanently. Owners living in the property as their permanent residence should also test the exemption: a VPT up to €125,000 with household taxable income under €153,300 can qualify for relief, granted on application and renewable every three years. Before buying, compare rates across neighbouring municipalities — a 0.15 percentage-point gap on an expensive home is real money every single year — and always pay before the deadlines printed on the assessment notice to avoid interest and enforcement costs.

Keep your caderneta predial handy when using the estimator: the VPT printed there already reflects the tax office valuation, so transcribing it beats guessing a market price. If you own several properties in the same municipality, remember each one is assessed separately and only parcels above the AIMI threshold add together for the surcharge. Pensioners and low-income households should also check the permanent-home exemption rules with their municipal tax office, and anyone disputing a VPT has a formal window to request a revaluation after an assessment update. Second, the municipality where the property sits is the single most important variable in your annual bill: two identical apartments across a municipal boundary can differ by roughly fifty percent in IMI purely because of the local assembly rate, so if you are comparing homes to buy, look up the published rate of each candidate municipality before negotiating. Third, when you request a rate quote from your city council or check past payment slips, confirm which year the rate applies to, because assemblies approve small changes each spring that only surface on the following year bill. Fourth, families holding several urban properties in the same municipality should remember that AIMI is assessed per owner and per municipality, not per building, so a portfolio of flats worth less than the threshold individually can still cross the exemption line when added together. Fifth, if you buy or sell during the year, IMI is prorated by law according to possession on 1 January of the following year rather than the closing date, which surprises many buyers who expect a refund for the unused months. Finally, keep every municipal assessment letter: the asset value printed there is the exact VPT figure this calculator expects, and using the purchase price or the bank appraisal instead produces misleading estimates.