IMU Tax on Garages: When It Is Due and How It Is Calculated

What Is an Appurtenance and When Is a Garage Considered One?

Under civil law, Article 817 of the Italian Civil Code defines appurtenances as things intended in a lasting manner for the service or ornament of another thing. Applied to a garage, this means that the box must be permanently designated to serve the primary residence: ownership of both properties is not enough; there must be an actual and concrete designation of the garage to serve the home where the owner maintains their registered residence and habitual abode. Furthermore, the appurtenant link (vincolo pertinenziale) must be declared by the taxpayer.

For IMU purposes, the regulations set a precise limit. Appurtenances classified in cadastral categories C/2, C/6, and C/7 are subject to the primary residence tax regime, up to a maximum of one single unit for each of these three categories, even if registered in the land registry together with the dwelling. In other words, a primary residence can have up to three exempt appurtenances, provided they belong to different cadastral categories.

This leads to the most significant consequence for those who own more than one garage. If a taxpayer has two garages both classified under the same category, only one of them can benefit from the tax relief as an appurtenance of the primary residence. The second one is subject to IMU like any other property.

IMU Exemption for Primary Residence Appurtenant Garages

A garage that meets the conditions to be considered an appurtenance to the primary residence follows the same tax regime as the house itself. Since IMU is generally not due on the primary residence, the exemption extends to the appurtenance as well, up to the limit of one unit for each of the categories C/2, C/6, and C/7.

However, certain conditions must be met for the exemption to apply:

• Residence and Abode: The owner must have their registered address (residence) and habitual abode in the primary residence, as this is what qualifies a property as a primary home for IMU purposes.

• Appurtenant Link: The existence and official declaration of the appurtenant link connecting the garage to the house.

The primary residence exemption does not apply to properties classified in cadastral categories A/1 (stately homes), A/8 (villas), and A/9 (castles and historical/artistic palaces), which are considered luxury properties. For these homes, IMU is due even when they serve as the primary residence—albeit with reduced rates and deductions set by the local Municipality—and this same treatment extends to their relative appurtenances.

Non-Appurtenant Garages: When IMU Must Be Paid

When a garage is not an appurtenance to a primary residence, it is subject to IMU like any other real estate property. Common scenarios in a diverse portfolio include:

• A garage purchased separately and not linked to the owner's primary residence.

• A second garage belonging to the same cadastral category as one already treated as an exempt appurtenance.

• A garage that serves as an appurtenance to a second home rather than a primary residence.

In all these cases, the garage generates a tax liability that the owner must calculate and pay. The tax base is determined using the method outlined below, while the tax rate to apply is the one enacted by the Municipality where the property is located. Unlike cadastral multipliers—which are fixed by national law—IMU rates are set by each individual Municipality within statutory limits and can change annually.

How to Calculate IMU on a Garage: Formula and Practical Example

To calculate IMU on a garage, start with the property's cadastral yield (rendita catastale), which can be found on the cadastral certificate (visura catastale).

The formula is:

$$\text{Annual Tax} = (\text{Cadastral Yield} \times 1.05) \times 160 \times \text{Municipal Tax Rate}$$

1. Revalue the Yield: Revalue the yield by 5% (multiply by 1.05).

2. Apply the Multiplier: Multiply the revalued yield by the cadastral multiplier, which is 160 for categories C/2, C/6, and C/7. This gives you the tax base (base imponibile).

3. Apply the Rate: Apply the tax rate set by the Municipality to the tax base.

Practical Example

Consider a C/6 category garage with a cadastral yield of €250:

• Revalued yield: $€250 \times 1.05 = €262.50$

• Tax base: $€262.50 \times 160 = €42,000$

• Calculated tax: Assuming a hypothetical rate of 10.6 per thousand (1.06% or 0.0106)—a value each owner must replace with their local Municipality's actual rate—the annual tax would be approximately €445.

The cadastral yield and category of your garage can be retrieved via the visura catastale in the private portal area of the Agenzia delle Entrate (Italian Revenue Agency).

Cadastral Differences: Categories C/2, C/6, and C/7

The three cadastral categories identifying garages, storage units, and parking spaces have distinct characteristics:

• C/2: Warehouses and storage premises, such as cellars, basements, and attics.

• C/6: Stables, barns, sheds, and garages—the primary category for enclosed parking boxes and garages.

• C/7: Open or enclosed sheds, including certain types of covered parking spots.

Knowing your garage's category is important for two main reasons:

1. Calculation: While all three categories use the same IMU multiplier (160), accurate classification ensures you use the correct cadastral yield.

2. Exemption Limits: Because the one-unit exemption rule applies per category, classification determines which properties qualify. Two C/6 garages cannot both be exempt; however, one C/6 garage and one C/2 cellar can both qualify.

Why Rely on Engel & Völkers to Manage a Diverse Real Estate Portfolio

A real estate portfolio comprising multiple property types requires a holistic overview—one that considers not just asset value, but also fiscal and operational implications.

Engel & Völkers assists property owners in managing complex real estate assets with tailored advisory services. We evaluate whether to hold, monetize, or sell garages and appurtenances—even separately from the main residence—aligned with the owner’s strategic goals.