Who counts as a professional user under Italian electricity excise law?

A professional user is an entity that buys electricity for non-residential own use and declares consumption to the Italian Customs Agency (ADM) itself. The main case is buying on the electricity market, the exchange under Art. 5(1) of D.Lgs. 79/1999: Art. 53(2)(c) TUA as rewritten by D.Lgs. 43/2025, cited until 2025 as Art. 53(1)(c-bis). It generates no electricity, but it does operate a plant: the purchase plant (officina di acquisto) under Art. 54 TUA, meaning the conductors, transformers, and distribution equipment downstream of the supplier's delivery point. Typical examples: large clinics, data centers, energy-intensive industrial sites, and hotels with substantial consumption.

How does the professional user differ from an ordinary end customer?

An ordinary end customer receives supply with excise already applied on the bill by the seller (the liable person). A professional user, by contrast, is itself the liable person for its own consumption plant: it receives energy without excise charged, self-assesses excise in its AD-1, pays ADM directly, and posts the surety bond. The status arises from the operating license for the purchase plant, or from an authorization where no plant is operated.

Does the professional user also need a power plant and a license?

Yes, and the answer runs the opposite way from what is often written. An operator of a purchase plant holds an operating license (licenza di esercizio), issued by the ADM office with jurisdiction over the plant and subject to the annual license fee under Art. 63 TUA. On this point purchase plants and production plants stand on equal footing. The authorization (autorizzazione) is instead the title held by liable persons that operate no plant, sellers above all, issued by the office with jurisdiction over the registered office (Art. 53-bis TUA). A market buyer that operates no plant is still a liable person: the title changes, the filing duty does not.

Which AD-1 quadri must the professional user file?

In the 2026 semi-annual model, a purchase plant for own use (officina di acquisto per uso proprio) files quadri B (electricity purchased), C (own consumption), E (taxed own use), H (energy received), Q (excise due per territorial area), S (payments and the balance of the semester) and T (provenance of the purchased energy). Allegato 3 is added only if the site has EV charging points. J, L and M are not part of this set: they hold energy invoiced to final consumers, and a professional user sells none. Quadro A is not filed either: it holds production meter readings, and the professional user generates nothing. Nor does any quadro carry the plant's identifying data, which belongs to the power plant notice under Art. 53-bis(1) TUA. ADM's table is a general rule, so extra quadri can follow the activity.

How is the bond calculated for a professional user?

The bond is 15% of estimated annual excise on taxable consumption (Art. 5 DM 10 March 2026), adjusted quarterly to the arithmetic mean of excise over the last three months (Art. 10 DM 10 March 2026). Where consumption is mostly exempt or out of scope, the bond drops proportionally. Worked example at the full rate: 50,000 kWh/month of non-residential use is 600,000 kWh/year, which at €0.0125/kWh gives €7,500 of annual excise and therefore roughly €1,125 of bond.

When does a small business become a professional user?

Revenue and headcount do not trigger the obligation. Sourcing and the shape of consumption do. The obligation arises by operation of law when the company buys for own use on the electricity market (Art. 53(2)(c) TUA), or when it uses electricity for own use across differently taxed applications with available power above 200 kW (Art. 53(2)(b) TUA). On application to ADM, two further categories can be recognized as liable: buyers whose electricity goes to a single use after transformation or conversion above 200 kW, and buyers sourcing from two or more suppliers with monthly consumption above 200,000 kWh at the same site (Art. 53(3) TUA).

What changes from 2026 for professional users?

The AD-1 declaration became semi-annual. The H1 2026 declaration (January to June) was due September 30, 2026; the next one is H2 2026 (July to December), due March 31, 2027 (Art. 8 DM 10 March 2026). Monthly down-payments are due by the end of each month, computed on the excise for the previous month's consumption (Art. 55(3) TUA, Art. 7 DM 10 March 2026, tax code 2806). The bond is unified at 15%. D.Lgs. 43/2025 and DM 10 March 2026 confirm that the professional user stays among the liable persons even without producing electricity.

AD-1 Professional User in Italy: Self-Use Buyers, Quadri and 2026 Deadlines

The professional user (Italian: utente professionale, buyer of electricity for own use) is the most overlooked declarant category in the Italian Testo Unico delle Accise (TUA, the Italian Excise Code). It does not generate electricity: it buys energy and consumes it for non-residential purposes. It is a liable person for the AD-1 under Art. 53(2)(c) TUA when it buys for own use on the electricity market, the exchange under Art. 5(1) of D.Lgs. 79/1999, and under Art. 53(2)(b) TUA when it uses electricity across differently taxed applications with available power above 200 kW. Mind the numbering: until 2025 the same category sat at Art. 53(1)(c-bis), then D.Lgs. 43/2025 rewrote the article. An operator of a purchase plant, one of the power plant declarant categories under Art. 53 TUA, holds an operating license issued by the ADM office with jurisdiction over the plant; the authorization is the title of liable persons that operate no plant (Art. 53-bis TUA). Either way it must post a surety bond at 15% of estimated annual excise on taxable consumption and file the declaration semi-annually from 2026 under D.Lgs. 43/2025. The H1 2026 declaration was due September 30, 2026; the next one, H2 2026, is due by March 31, 2027.

Who the professional user is (Art. 53(2)(c) TUA)

The statute, as rewritten by D.Lgs. 43/2025, makes liable for excise "persons who purchase, for own use, electricity from the electricity market under Article 5(1) of Legislative Decree 79 of March 16, 1999, limited to the consumption of that electricity". In plain terms: the industrial, commercial, or tertiary consumer that sources on the exchange, receives the supply net of excise, and self-assesses excise in its own AD-1. Three traits define the category:

No production, but a real plant: no inverters, gensets, or generators. There is, however, a purchase plant under Art. 54 TUA, meaning the conductors, transformers, storage units, and distribution equipment downstream of the supplier's delivery point, fitted with fiscal meters.
Excise-free purchase: the seller (or the market operator, for exchange purchases) bills only the energy, dispatching, and transport components. The national excise under Art. 52 TUA is the only duty on the quantity taken, and the user self-assesses it in its own AD-1.
Operating license (not authorization): for a plant operator, the ADM instrument is the operating license (licenza di esercizio), issued by the office with jurisdiction over the plant and subject to the annual license fee under Art. 63 TUA. On this point purchase plants and production plants stand on equal footing. The authorization belongs to liable persons that operate no plant, sellers above all (Art. 53-bis TUA).

When you become a professional user

Revenue and headcount do not trigger the obligation. The statute sets out three routes, two automatic and one on application:

Purchase on the electricity market(Art. 53(2)(c) TUA): a large energy-intensive company (steel, glass, data center, clinic with CHP) sources on the exchange rather than from a retail seller. The energy arrives "net" and excise liability shifts to the end customer, limited to the consumption of that electricity.
Mixed use above 200 kW (Art. 53(2)(b) TUA): a business that uses electricity for own use across differently taxed applications, part taxable, part exempt or out of scope, with available power above 200 kW is liable by operation of law, with no application needed. It handles the accounting separation in the AD-1: out of scope under Art. 52(2) TUA (electrolytic, metallurgical, and mineralogical processes), exempt under Art. 52(3) TUA (railway, urban transport, electricity generation).
Recognition on application (Art. 53(3) TUA): a buyer whose electricity goes to a single use after transformation or conversion above 200 kW (letter a), or which sources from two or more suppliers with monthly consumption above 200,000 kWh at the same site (letter b), can ask ADM to be recognized as a liable person.

AD-1 quadri for the professional user

The set of quadri differs noticeably from the producer's: no Quadro A, because that quadro holds production meter readings and the professional user generates nothing. Nor does any quadro identify the plant: location, type and capacity in kW are declared in the power plant notice under Art. 53-bis(1) TUA, and the declarant appears in the cover sheet (frontespizio). For a purchase plant used for own consumption the 2026 semi-annual quadri are B, C, E, H, Q, S and T (plus Allegato 3 if the site has EV charging points):

Quadro	Content for the professional user
B - electricity purchased	Metered energy purchased in the half-year, by meter and by supplier.
C - own consumption	Breakdown of the energy the professional user consumes itself, by usage code.
E - taxed own use	Own consumption that is subject to excise.
H - energy received	Energy taken in from suppliers and network operators over the period.
Q - excise due	Excise due per territorial area (ambito) and month. This is where consumption is attributed to the area it was taken in.
S - payments and balance	Per territorial area: excise due, amounts paid by F24, credit used, and the resulting balance of the semester.
T - provenance of purchased energy	Energy purchased in the half-year by origin (EU, non-EU, distribution network user, electricity market, energy product supplier), from supplier invoices issued in the period.

J, L and M do not apply to a professional user: they hold energy invoiced to final consumers. Out-of-scope and exempt uses (Art. 52(2) and (3) TUA) are declared within own consumption, in quadro C, under the matching usage code.

Surety bond, deadlines, and payments

15% bond (Art. 5 DM 10 March 2026): calculated on estimated annual excise from taxable consumption. Adjusted quarterly to the arithmetic mean of excise over the last three months (Art. 10 DM 10 March 2026).
2026 deadlines: H1 (January to June) was due September 30, 2026 and has passed. The next deadline is H2 (July to December), by March 31, 2027 (Art. 8 DM 10 March 2026).
Monthly down-payments(Art. 55(3) TUA, Art. 7 DM): by the end of each month, on the excise for the previous month's consumption, so January consumption is paid by the end of February. F24 ACCISE, tax code 2806.
Ravvedimento operoso (voluntary correction): codes 2820 (interest) and 2821 (excise penalty), at 0.08% per day under D.Lgs. 87/2024.
No local surcharge: no regional, provincial, or municipal surcharge applies to electricity. All were abolished in 2012 (Art. 2(6) D.Lgs. 23/2011, Art. 18(5) D.Lgs. 68/2011, and Art. 4(10) DL 16/2012, which repealed Art. 6 DL 511/1988 outright, covering the special-statute regions and the Autonomous Provinces of Trento and Bolzano); Constitutional Court judgment 43/2025 struck it down retroactively. Quadri Q and S settle the national excise alone, broken down by territorial area.

Common errors and gray areas

Staying a retail customer out of inertia: companies that exceed the energy-intensive thresholds yet keep buying from the retail seller with excise already on the bill lose the ability to offset reduced rates. It is worth evaluating the switch to professional user once consumption passes 1-2 GWh/year.
Forgetting the territorial area: consumption spread across multiple territorial areas requires a detailed Quadro Q, one line per ambito. Aggregating everything into a single area misattributes both the declared quantities and the F24 payments that settle them, so the competent ADM office cannot reconcile the filing: expect a correction request and penalties for the mismatch.
Confusing "exempt" with "out of scope": chemical reduction, electrolytic and metallurgical processes (Art. 52(2)(e) TUA) and mineralogical processes (letter f) are out of scope, not exempt, so they must not be declared as exempt use. Either way a technical attestation of the process is required. ADM audits on a sample basis: filers without a technical file face tax recovery plus penalties.
Underestimated bond: the quarterly update is mandatory. Keeping the initial bond after 12 months of growing consumption can trigger automatic revocation of the operating license.
Skipping down-payments in a low-consumption month: the monthly down-payment is computed on actual monthly consumption, not a historical average. A zero-consumption month (for example, an August shutdown) means a zero down-payment, but a symbolic payment helps keep the filing chronology clean.