IMI property tax calculator
IMI is the annual tax on owning property in Portugal, and it is usually the smallest of the property taxes — but it arrives every year, so it belongs in the budget from the start. Enter the taxable value and your municipality to see the bill.
IMI property tax appears here.
Adjust the fields on the left. The estimate updates as you change a value, and the method behind it is explained in full underneath.
The three numbers behind the bill
IMI is a rate applied to a value. The value is the VPT — the taxable value recorded in the land registry — and it is usually lower than what you paid for the property, because it follows the municipal valuation rules rather than the market. The rate is set by your municipality each year within a national range. The third number is time: how much of the year you owned it, since IMI is charged to whoever owns the property on 31 December.
The rate
Article 112 of the IMI code fixes urban property between 0.3% and 0.45%, and each municipal assembly chooses where to sit inside that band for each 2026 assessment. One narrow exception runs above it: a municipality covered by the local-economy support programme or the municipal adjustment programme may go as far as 0.5%, and a few do — which is why this tool accepts a figure the general band would not. Rates can also be set parish by parish, so two similar apartments in the same city can carry different bills.
The rate you see when you pick a municipality here is a planning preset, not a live feed. Municipal decisions change, and they are published annually — the Portal das Finanças rate lookup is the only figure worth relying on for a real assessment.
The reduction for dependents
Article 112-A lets municipalities reduce the tax on a household's permanent home according to the number of dependents: €30 for one, €70 for two, €140 for three or more. Two conditions decide whether you get it. The property has to be the home where your household has its tax domicile — not a rental you let out, not a second home, not a property held through a company. And the municipality has to have adopted the reduction, because the article permits it rather than imposing it.
The tax authority applies the reduction automatically from its own records, so there is nothing to claim — but there is something to check, because a wrong address on file means a lost reduction.
Paying it
Article 120 sets the rhythm. Up to €100 is paid in one instalment in May. Above €100 and up to €500, it splits into two, in May and November. Above €500 it splits into three: May, August and November. The tool shows which pattern your figure falls into, because the monthly average matters more to a household budget than the annual total.
What IMI is not
Buying a Portuguese property involves other taxes that dwarf IMI in the first year: IMT on the purchase, stamp duty, notary and registration fees, and possibly the annual additional stamp duty on higher-value holdings. IMI is the long, quiet cost that follows you every year after. Budget for the others with a lawyer; use this tool to keep the recurring one visible.
Questions this tool raises
Is IMI based on what I paid for the property?
No. It is charged on the VPT — the taxable value in the land registry — which is produced by the municipal valuation formula and is often well below the purchase price. You can find it on the caderneta predial or in the Portal das Finanças.
Who pays IMI if I buy mid-year?
The person who owns the property on 31 December is liable for that year’s IMI in full. Contracts sometimes split it between buyer and seller, but that is a private arrangement between the two of you, not something the tax authority does.
Do I pay IMI on a property I rent out?
Yes — ownership, not occupancy, creates the liability. The dependent reduction is different: that one is tied to the home where your household has its tax domicile, so a property you rent to someone else does not qualify for it.
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