Is SDI mandatory for all Italian businesses?

Yes. Since January 2019, all B2B invoices between Italian VAT-registered businesses must pass through SDI. B2G invoicing via SDI has been mandatory since 2014. There are very limited exemptions (some micro-businesses in specific regimes).

Can I send a Peppol invoice to an Italian business?

Not directly to SDI — SDI requires FatturaPA format. However, Access Points and intermediaries can bridge the two systems: accepting a Peppol BIS invoice, converting it to FatturaPA, and submitting it to SDI on your behalf.

Is Italy moving to Peppol?

Italy is expanding Peppol adoption for cross-border invoicing while keeping SDI for domestic transactions. The EU’s ViDA directive may eventually push toward greater Peppol integration, but SDI remains the domestic standard for the foreseeable future.

What format does SDI use?

FatturaPA version 1.2 — an Italy-specific XML format maintained by the Agenzia delle Entrate. It predates EN 16931 and has its own structure, field names, and validation rules that differ significantly from UBL-based formats.

How does ViDA affect Peppol vs SDI?

The EU’s VAT in the Digital Age (ViDA) directive promotes cross-border e-invoicing standardization. It may create requirements for interoperability between national systems (like SDI) and pan-European networks (like Peppol). The full impact depends on final implementation timelines.

Peppol vs SDI (FatturaPA): Comparing EU E-Invoice Infrastructure

Side-by-Side Comparison

Feature	Peppol	SDI (FatturaPA)
Architecture	Federated — many Access Points, no central hub	Centralized — all invoices pass through one government hub
Scope	39+ countries	Italy only
Invoice format	Peppol BIS 3.0 (UBL 2.1)	FatturaPA 1.2 (Italy-specific XML)
Standard base	EN 16931 + Peppol CIUS	Italian-specific schema (not directly EN 16931)
Transport	AS4 between Access Points	HTTPS upload to SDI or PEC (certified email)
Government visibility	No — invoices travel point-to-point	Yes — tax authority sees every invoice in real time
Validation	Sender-side + receiver-side validation	SDI validates centrally before delivery
Delivery confirmation	Access Point receipts (MLR)	SDI issues acceptance/rejection notifications
Tax reporting	Separate from invoicing	Integrated — SDI data feeds directly to tax authority
Cross-border	Native — designed for multi-country	Limited — domestic focus, Peppol growing for cross-border

Peppol

Peppol is a federated network where certified Access Points route invoices between businesses without a central hub. Each Access Point is independently certified and handles its own message routing, validation, and delivery. No single entity sees all invoices — the network is decentralized by design.

Peppol uses the BIS Billing 3.0 format (UBL 2.1 based, EN 16931 compliant) and the AS4 transport protocol. It operates in 39+ countries with 300,000+ registered participants.

SDI (FatturaPA)

Italy’s Sistema di Interscambio (SDI) is a centralized clearinghouse operated by the Agenzia delle Entrate (Italian Revenue Agency). Every e-invoice between Italian businesses must pass through SDI. The system validates the invoice, delivers it to the recipient, and simultaneously feeds the data to tax authorities for real-time VAT reporting.

SDI uses the FatturaPA 1.2 format — an Italy-specific XML schema that predates EN 16931. Invoices are submitted via HTTPS or PEC (Italy’s certified email system). SDI has been mandatory for all Italian B2B since January 2019, making Italy one of the earliest and most complete e-invoicing mandates in the EU.

Key Differences Explained

Centralized vs. federated

SDI is a single government hub that every invoice must pass through. Peppol is a network of independent Access Points that route invoices directly. SDI gives the tax authority full visibility of every transaction in real time. Peppol separates invoicing from tax reporting — the network moves documents, but governments don’t see the content unless separate reporting is required.

Format differences

SDI uses FatturaPA 1.2 — an Italy-specific XML format. Peppol uses BIS 3.0 — a UBL-based format compliant with the pan-European EN 16931 standard. They’re not interchangeable. Cross-border invoices between Italy and other EU countries require format conversion at some point in the chain.

Tax integration

SDI’s killer feature: integrated tax reporting. Because every invoice passes through the government hub, Italy gets real-time VAT data without requiring separate reporting. Peppol doesn’t have this — countries using Peppol still need separate e-Reporting mechanisms (like Belgium’s planned 2028 system).

When to Use Peppol

·Cross-border EU invoicing to or from Italy
·Multi-country B2B where Italy is one of several markets
·Belgian, German, Dutch, or other EU domestic invoicing
·When you want a single network integration for multiple countries

When to Use SDI (FatturaPA)

·All domestic Italian B2B invoicing (mandatory)
·All Italian B2G invoicing (mandatory since 2014)
·When an Italian buyer requires FatturaPA format
·When you need integrated Italian tax compliance

Can You Use Both?

For cross-border invoicing involving Italy, you may need both systems. An invoice from a Belgian company to an Italian buyer might originate on Peppol but needs to reach SDI for Italian delivery. Access Points and intermediaries handle this bridge — converting between Peppol BIS and FatturaPA formats and routing between the two networks. Italy is actively expanding Peppol support for cross-border use alongside SDI for domestic transactions.

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Frequently Asked Questions

Related Comparisons

What is Peppol?

The EU e-invoicing network

Italy e-invoicing

SDI and FatturaPA requirements

ViDA directive

EU VAT in the Digital Age

Peppol vs XRechnung

Network vs German format

EU e-invoicing deadlines

All mandate dates