Italy IMU Property Tax Calculator

> Quick Answer: A property with a €500 cadastral income (rendita catastale), in an ordinary residential category, taxed at the commonly-cited national base rate of 0.86%, owes €722.40 in annual IMU (Imposta Municipale Propria).

Overview

IMU is Italy's municipal property tax -- the main recurring tax on real estate ownership, collected by each comune (municipality) rather than the national government. Unlike a US-style property tax based on market value, IMU is built on the rendita catastale (cadastral income), a government-assessed figure tied to each property's registered cadastral category, then run through a fixed statutory revaluation and a category-specific multiplier before the comune's own rate is applied.

Since 2020's IMU/TASI unification (L. 160/2019), IMU is the single recurring municipal property tax (the old separate TASI service tax was folded in). Ordinary primary residences are exempt outright; only luxury-category homes and non-primary properties (second homes, rentals, commercial buildings, garages) pay. This calculator walks through the full statutory formula end to end, in euros, using your property's actual cadastral data.

How This Is Calculated

Cadastral Category Group	Multiplier
Housing A/2-A/9 (excl. A/10) + garages/cellars/sheds (C/2, C/6, C/7)	160
Group B (colleges, hospitals) + workshops/gyms/labs (C/3, C/4, C/5)	140
A/10 offices + D/5 banks/insurance	80
Group D industrial/commercial (excl. D/5)	65
C/1 shops	55

Worked Example

Using the calculator's default inputs:

Rendita Catastale: €500
Category: Housing (multiplier 160)
Municipal Rate: 0.86% (the commonly-cited national base rate)
Ownership Share: 100%, held the full 12 months

Step by step:

Revalued rendita = €500 × 1.05 = €525.00.
Taxable base = €525.00 × 160 = €84,000.00.
Annual tax = €84,000.00 × 0.86% = €722.40.
Full ownership and a full year of possession mean no proration is needed: IMU due = €722.40.

Now compare a luxury primary residence: €800 rendita catastale, category A/1, at a 0.5% rate with the full €200 deduction. Revalued rendita = €840.00; taxable base = €840.00 × 160 = €134,400.00; annual tax = €134,400.00 × 0.5% = €672.00; after the €200 deduction, IMU due = €472.00 -- even though it's the owner's own home, because A/1 is a luxury category.

A third case: a C/1 shop with €1,200 rendita catastale, held at 50% ownership for only 6 months, at a 1.06% rate. Revalued rendita = €1,260.00; taxable base (multiplier 55) = €69,300.00; full-year tax = €734.58; prorated for 50% ownership and 6/12 months = €183.65.

What This Does Not Account For

Agricultural land and farm buildings, which use a different revaluation (25%, not 5%) and different multipliers entirely -- this calculator only covers residential, office, and commercial building categories.
Your specific comune's exact current-year rate. Municipal IMU rates change annually by comune resolution and were not individually re-verified against each comune's official delibera for this calculator -- always confirm your actual rate against your comune's published IMU regulation or your F24 payment notice before filing.
TARI (waste collection tax) and other local levies, which are billed separately from IMU and not included here.
The "assimilazione" rules that can extend the primary-residence exemption to certain non-resident owners (e.g., some pensioners residing abroad, or one spouse living elsewhere for work) under specific comune-level or national provisions -- this calculator assumes a straightforward owner-occupier or non-primary-residence scenario.
Multiple co-owners with different possession periods or shares in the same year (e.g., a mid-year sale where the buyer and seller each owe a different prorated amount) -- run the calculator once per owner/period if your situation is more complex than a single share and a single possession window.

Common Pitfalls

Forgetting the 5% revaluation step. The cadastral income printed on your visura catastale is not the taxable base -- it must first be increased by 5%, then multiplied by the category coefficient, before any rate is applied.
Using the wrong multiplier. Housing (160) and shops (55) are the two most commonly confused -- a C/1 shop uses 55, not 160, producing a materially smaller taxable base for the same rendita catastale.
Assuming all primary residences are exempt. Only ordinary categories (A/2-A/9, excluding A/1, A/8, A/9) qualify for the blanket exemption -- luxury-category primary residences still owe IMU, just at a reduced rate with a deduction.
Applying a full year's tax to a partial-year purchase or sale. IMU is prorated by full calendar months of possession -- buying a property in July means owing roughly half a year's tax, not the whole year's amount.
Using last year's municipal rate. Comuni can and do change their aliquota comunale from year to year; always check your comune's current-year delibera rather than reusing a prior year's figure.

Frequently Asked Questions

How is IMU calculated in Italy?▸

Take the rendita catastale (cadastral income) from your visura catastale, increase it by the statutory 5% revaluation, multiply by your property's category coefficient (160 for ordinary housing, 55 for shops, and so on), then multiply that taxable base by your comune's deliberated rate -- prorated for your ownership share and months of possession in the year.

Is my primary residence exempt from IMU?▸

Yes, if it's in an ordinary residential category (A/2 through A/9 excluding A/1, A/8, A/9) and you both hold residency (residenza anagrafica) and habitually live there (dimora abituale). Luxury-category primary residences (A/1 villas... A/8 grand villas, A/9 historic castles/palaces) remain taxable, just at a reduced rate with a deduction.

What is the "rendita catastale" and where do I find it?▸

It's the government-assessed cadastral income assigned to your property, found on your visura catastale (obtainable from the Catasto/Agenzia delle Entrate). It is NOT your property's market value or purchase price -- it is typically much lower, which is why the multiplier step exists to build a realistic taxable base from it.

Why does the multiplier vary so much between categories (55 to 160)?▸

The multipliers were calibrated historically to approximate a consistent ratio between the rendita catastale and each category's typical market value -- shops (C/1) and industrial buildings (D) tend to have rendite that are proportionally higher relative to value than ordinary housing, hence their lower multipliers.

Can my comune set any IMU rate it wants?▸

No -- comuni set their own aliquota comunale within bands defined by national law, and the multiplier coefficients themselves are always fixed nationally regardless of comune. The 0.86% figure used as this calculator's default is a commonly-cited national base rate, not a legal ceiling or floor for every comune.

Do I owe IMU if I only owned the property for part of the year?▸

Yes, but only prorated for the full calendar months you actually held it -- the "months possessed" input in this calculator handles that proration automatically.

Is IMU the same as TASI?▸

Not anymore. TASI (the tax for indivisible municipal services) was folded into IMU by the 2020 unification reform (L. 160/2019), so IMU is now the single recurring municipal property tax that replaced both the old IMU and TASI regimes.

Sources

D.L. 201/2011, art. 13, and L. 160/2019 (IMU/TASI unification): governing framework for the tax, its cadastral-income basis, the 5% revaluation, and the category-multiplier mechanism.
Cadastral multiplier table cross-verified across two independently-concordant 2026 sources (fiscoinvestimenti.it, imu-online.it), which list an identical set of coefficients (160 / 140 / 80 / 65 / 55).
Primary-residence exemption and luxury-category (A/1, A/8, A/9) treatment, including the reduced rate and up-to-€200 deduction: corroborated via current 2026 guidance (fiscoinvestimenti.it).
Caveat: the exact legal floor/ceiling of the comune-set rate band, and any specific comune's current-year deliberated rate, were not independently re-verified against each comune's official delibera or against a primary Normattiva/Gazzetta Ufficiale text this session -- always confirm your comune's actual current rate before filing.

Italy IMU Property Tax Calculator (Municipal Property Tax)

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