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

A professional user is an entity that buys electricity from the free or protected market for non-residential own use and must declare consumption to the Italian Customs Agency (ADM) under Art. 53(2)(c) TUA. It does not generate electricity: the power plant is virtual, made up of the metered withdrawal points it owns. 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 holding an operating authorization.

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

An operating authorization is enough (lighter than the full licence): the professional user generates no electricity and is not subject to the technical inspections required of producers. The local ADM office issues the authorization based on the virtual plant declaration, the withdrawal points, and the fiscal meters installed by the distributor.

Which AD-1 quadri must the professional user file?

Typical quadri: B (purchases from the seller, broken down by rate), C (any transfers to third parties, usually empty), E (consumption exempt by use type), G (excise calculation), H (any credits), I (payments made), and P/Q (summaries and breakdown by territorial area). A producer-form Quadro A is not filed; only an identifying entry for the virtual plant, and there is no production-form Quadro B.

How is the bond calculated for a professional user?

The bond is 15% of estimated annual excise on taxable consumption (Art. 10 DM March 10, 2026), updated quarterly to the arithmetic mean of excise over the last three months. For consumption that is mostly at a reduced rate or exempt, the bond drops proportionally. For fully taxable consumption it can reach significant amounts (for example, 50,000 kWh/month at the full rate works out to roughly €750-900/year in bond).

When does a small business become a professional user?

Revenue and headcount do not trigger the obligation. What does: the type of contract relationship and holding an operating authorization. The obligation typically arises when (a) the company contracts dispatching and transport directly on the wholesale market, bypassing the retail seller; (b) it manages multiple consumption sites with differentiated rates; or (c) it claims exemption for specific uses (for example, electrochemical processes under Art. 52(3)(f) TUA) and ADM requires a direct declaration.

What changes from 2026 for professional users?

The AD-1 declaration becomes semi-annual (H1 by September 30, 2026; H2 by March 31, 2027), with monthly down-payments due by the end of the reference month (tax code 2806). The bond is unified at 15%. Adjustments to prior periods are handled in Quadro L. D.Lgs. 43/2025 and DM March 10, 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 on the free or protected market and consumes it for non-residential purposes. It is a liable person for the AD-1 under Art. 53(2)(c) TUA when it operates a consumption plant, typically because it contracts dispatching and transport directly on the wholesale market, manages multiple sites with differentiated rates, or claims use-specific exemptions (electrochemical processes, traction, agriculture). Like other power plant operators under Art. 53 TUA, the professional user is a declarant category for AD-1 purposes. Unlike a producer, it does not need the full licence, only an operating authorization. It must still 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 (H1 by September 30, 2026; H2 by March 31, 2027).

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

The statute defines a liable person as "whoever purchases, for own use, electricity with excise payable directly by themselves". In plain terms: the industrial, commercial, or tertiary consumer who, by volume, differentiated rate, or exemption title, receives the supply net of excise and self-assesses excise in its own AD-1. Three traits define the category:

No production: the plant is virtual. No inverters, gensets, or generators; only withdrawal points fitted with fiscal meters.
Excise-free purchase: the seller (or the distributor if the customer trades on the wholesale market) bills only the energy, dispatching, and transport components. The user self-assesses the national excise and the regional surcharge.
Authorization (not licence): ADM issues the operating authorization based on the virtual plant declaration, the metered withdrawal points (POD) involved, and the prevailing use type.

When you become a professional user

Revenue and headcount do not trigger the obligation. Three scenarios typically turn a business into an ADM professional user:

Direct purchase on the wholesale market: a large energy-intensive company (steel, glass, data center, clinic with CHP) contracts directly with a trader, bypassing the retail seller. The trader delivers energy "net", so excise responsibility shifts to the end customer.
Self-assessed use-based exemption: uses subject to full exemption or reduced rates (Art. 52(3)(a-g) TUA: electrochemical and mineralogical processes, agriculture, railway) require that the exempt share is not billed. The user handles accounting separation in the AD-1.
Multi-site with differentiated rates: a business operating many POD across regions with varied tariffs, including a portion attributable to third parties (concessionaires, lessees, sub-meters), often finds direct declaration more efficient.

AD-1 quadri for the professional user

The set of quadri differs noticeably from the producer's: no production-form Quadro A, no Quadro B for gross output. The typical structure:

Quadro	Content for the professional user
B (purchases)	Energy purchased in the half-year, broken down by national and regional rate, by supplier, and by POD.
C (transfers)	Any transfers to third parties (for example, sub-tenants of commercial property with dedicated metering). Usually empty for professional users.
E (exemptions)	Shares consumed in exempt uses under Art. 52(3) TUA. Detail by exemption title and POD.
G (excise settlement)	National and regional excise settlement; difference between down-payments and excise actually owed.
H (credits)	Only if there are credits to offset (for example, ravvedimento operoso, restatement of prior periods closed at credit).
I (payments)	Monthly down-payments and balances paid via F24 ACCISE, tax code 2806.
P / Q	Summary tables and data by territorial area (needed to attribute regional surcharges correctly).
L (adjustments)	Only for corrections to prior periods already declared.

Surety bond, deadlines, and payments

15% bond (Art. 10 DM March 10, 2026): calculated on estimated annual excise from taxable consumption. Updated quarterly to the arithmetic mean of excise over the last three months.
2026 deadlines: H1 (January to June) by September 30, 2026; H2 (July to December) by March 31, 2027. Unified national calendar.
Monthly down-payments (Art. 11 DM): by the 16th of the following month. 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.
Regional surcharge: settled in Quadro G by region; rates vary year to year. Region-by-region data goes in Quadro Q.

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 (Art. 5 DM March 10, 2026): consumption spread across multiple regions requires a detailed Quadro Q. Aggregating everything into one region produces regional-surcharge errors and penalties.
Undocumented exemptions: the Art. 52(3)(f) TUA exemption (electrochemical processes) requires a technical attestation of the process. ADM audits on a sample basis: filers who declare exempt 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 authorization.
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.