Italy's SDI: How the E-Invoicing Pioneer Shaped Europe's Digital Tax Future

Italy became the first EU country to mandate electronic invoicing for all VAT-registered businesses, launching its SDI (Sistema di Interscambio) clearance platform on 1 January 2019. The mandate covers B2B, B2C, and B2G transactions alike, an unprecedented scope that no other European country had attempted at the time. Managed by the Agenzia delle Entrate (Italian Revenue Agency), the SDI routes every invoice through a government-operated exchange system in a structured XML format called FatturaPA, enabling real-time tax verification before the invoice reaches its recipient.

How the SDI Clearance Model Works

Unlike post-audit reporting systems used in many European countries, Italy’s SDI operates as a clearance model. This means invoices must pass through the government platform before they are delivered to the buyer. The process works in four steps:

• •Submission: The seller generates an invoice in FatturaPA XML format and transmits it to the SDI, either directly or through an accredited intermediary.
• •Validation: The SDI checks the invoice for structural correctness, valid tax identification numbers, and format compliance. If the invoice fails validation, it is rejected and the seller must correct and resubmit it.
• •Delivery: Once validated, the SDI routes the invoice to the buyer through the buyer’s registered channel, whether certified email (PEC), a web service endpoint, or the Agenzia delle Entrate’s online portal.
• •Notification: Both parties receive delivery confirmations. The Agenzia delle Entrate retains a copy of every invoice, giving it complete visibility into the Italian economy’s invoicing activity.

This design gives the tax authority access to invoice data at the point of issuance, rather than relying on periodic VAT returns filed weeks or months later. The result has been a significant reduction in Italy’s VAT gap, the difference between expected and collected VAT revenue.

FatturaPA v1.9: The 2025 Update

FatturaPA version 1.9, which took effect on 1 April 2025, introduced several important changes to the XML schema and business rules:

• •TD29 document type: A new transaction document type for reporting irregular invoices from suppliers. This replaces the previous TD20 workflow and gives buyers a standardised way to notify the Agenzia delle Entrate when a supplier fails to issue a correct invoice.
• •RF20 regime code: A new tax regime code introduced to accommodate specific regulatory scenarios. Businesses using the new regime must update their invoicing software to include the correct code.
• •Tighter validation rules: The SDI now performs stricter checks on field combinations and cross-references, rejecting invoices that would previously have been accepted with warnings.

Businesses and their software providers should ensure their invoicing systems are updated to support FatturaPA v1.9. Invoices submitted in the older format that rely on deprecated document types may be rejected by the SDI.

Timeline of Key Milestones

• •June 2014: E-invoicing becomes mandatory for B2G (business-to-government) transactions through the SDI.
• •1 January 2019: SDI mandate extends to all B2B and B2C transactions for VAT-registered businesses, making Italy the first EU country with universal e-invoicing.
• •1 January 2024: The obligation extends to micro-businesses (forfettari) with annual revenue of €25,000 or less, closing the last major exemption.
• •1 April 2025: FatturaPA v1.9 takes effect, introducing TD29 document type and RF20 regime code.
• •22 December 2025: The Consolidated VAT Code (Testo Unico IVA) is formally approved by the Italian government.
• •1 January 2027: Testo Unico IVA takes effect, consolidating Italy’s VAT legislation into a single unified code.
• •31 December 2027: Italy’s current EU derogation to mandate e-invoicing expires.

Scope and Exemptions

The SDI mandate now covers virtually all VAT-registered businesses operating in Italy, regardless of size or sector. Since January 2024, even micro-businesses under the flat-rate regime (regime forfettario) with annual revenue at or below €25,000 must issue e-invoices through the SDI.

The most notable exemption applies to healthcare B2C transactions. Invoices issued by healthcare providers to individual patients are permanently exempted from the SDI mandate to protect patient confidentiality. Medical data transmitted through a government clearance platform would create privacy risks incompatible with Italian and EU data protection regulations. Healthcare B2B invoices (for example, invoices between a medical practice and a supplier) remain subject to the mandate.

Penalties for non-compliance are significant. Missing or late invoices can attract fines of 90% to 180% of the VAT amount on the transaction. Initial grace periods for micro-businesses have now expired, meaning the full penalty regime applies to all obligated taxpayers. Official SDI documentation is available from the Agenzia delle Entrate.

The Testo Unico IVA

On 22 December 2025, the Italian government approved the Testo Unico IVA, a consolidated VAT code that will take effect on 1 January 2027. This reform consolidates Italy’s fragmented VAT legislation, which has accumulated through decades of amendments and special provisions, into a single coherent legal text.

For businesses, the practical impact is a clearer legal framework for VAT compliance. While the Testo Unico IVA does not fundamentally change tax rates or the e-invoicing obligation, it reorganises and simplifies the rules, making it easier for businesses and advisors to understand their obligations. Companies should review the consolidated code with their tax advisors to ensure their processes and systems reflect the updated legal references.

Italy’s Influence on EU ViDA

Italy’s SDI has served as the primary reference model for the EU’s VAT in the Digital Age (ViDA) framework. The core concept of ViDA, structured e-invoicing with near real-time reporting to tax authorities, mirrors the clearance architecture that Italy pioneered in 2019.

Italy’s experience demonstrated that universal e-invoicing is technically feasible at scale, even across an economy with millions of small businesses and diverse sectors. The lessons learned from the SDI rollout, including the importance of phased implementation, clear exemption policies, and effective intermediary networks, have directly informed ViDA’s design. Other member states such as France have explicitly cited Italy’s system as a benchmark in developing their own e-invoicing mandates.

As ViDA moves toward its 2030 target for mandatory intra-community digital reporting, Italy is well positioned to transition smoothly. Its businesses and systems are already operating under requirements that closely resemble what ViDA will demand across the EU. For a broader view of how SAF-T and e-invoicing requirements are evolving across Europe, see our SAF-T adoption overview.