FatturaPA & Italian E-Invoicing 2026: SdI Compliance, B2B+B2C Mandatory & Integration Guide

The 2026 Italian E-Invoicing Landscape at a Glance

No other EU country has a comparably mature e-invoicing stack. The seven building blocks below — FatturaPA, SdI, AdE, Codice Univoco, PEC, Conservazione, and the dominant providers — form a single, tightly integrated compliance fabric. Keep this card stack nearby as you read each deep-dive section.

1. FatturaPA XML Format Overview

What FatturaPA Actually Is

FatturaPA is the structured XML invoice format defined by the Italian Revenue Agency (Agenzia delle Entrate). It is not a PDF; it is not an EDIFACT message; it is a single UTF-8 XML file conforming to the publicly published FA(2) XSD schema (currently version 1.7+ in 2026). The schema defines roughly 200 elements organised into header blocks (DatiTrasmissione, CedentePrestatore, CessionarioCommittente) and body blocks (DatiGenerali, DatiBeniServizi, DatiPagamento). Every field is typed; every cardinality is enforced; every code value is drawn from a closed AdE-published list.

The format originated in 2014 for the B2G (Public Administration) flow, mandated by the Italian Ministry of Economy and Finance and operationalised by Sogei. Under Legge 205/2017 (Legge di Bilancio 2018) the same XML schema was extended to all B2B and B2C transactions from 1 January 2019. The schema was lightly revised but kept backwards-compatible: a 2026 invoice is still recognisably the same document an Italian public administration received in 2015.

Filename, TD Codes and Digital Signature

FatturaPA filenames follow the pattern IT{PartitaIVA}_{ProgressivoUnivoco}.xml (e.g. IT01234567890_00001.xml); the progressivo is a 5-character base-36 counter unique within the issuer's namespace. When digitally signed with a XAdES-BES certificate the extension becomes .xml.p7m. The SdI rejects any submission whose filename does not respect the convention.

Every FatturaPA carries a TipoDocumento (TD) field. The AdE list has grown from a handful in 2014 to 28 codes in 2026. The most important for e-commerce are:

• TD01 — Fattura: standard sale invoice; default for most marketplace orders.
• TD04 / TD05 — Nota di credito / debito (refund / supplement).
• TD24 — Fattura differita; deferred / monthly summary invoice, widely used for e-commerce DDT consolidation.
• TD17 / TD18 / TD19 — Integrative / reverse-charge codes for cross-border purchases (replaced esterometro from 1 July 2022).
• TD20 — Autofattura denuncia when the supplier fails to issue. TD27 — autoconsumo / cessione gratuita.

Using the wrong TD code is the most common cause of SdI rejection (esito di scarto). For B2G the FatturaPA must be signed with a XAdES-BES AgID-qualified certificate; for B2B/B2C the signature is technically optional but every reputable provider applies it automatically because Conservazione Sostitutiva requires integrity proof for the 10-year archive.

2. Sistema di Interscambio (SdI) Routing

Italy's National Clearance Hub

The Sistema di Interscambio (SdI) is the central government routing platform between every Italian issuer and every Italian recipient. Operated by Sogei S.p.A. on behalf of the Agenzia delle Entrate, it is a clearance model — the invoice is not legally issued until the SdI accepts it, and not legally received until the SdI delivers it. There is no fallback path. The SdI processes around 2 billion FatturaPA per year with a real-time SLA: a well-formed B2B invoice clears XSD validation, business-rule checks and recipient routing in under 10 seconds.

The Five SdI Esiti

Every SdI submission ends with one of five outcome notifications (ricevute):

• RC — Ricevuta di Consegna: delivered to Codice Univoco or PEC. Legally issued and received.
• MC — Mancata Consegna: recipient channel unreachable (e.g. PEC full). SdI accepted, invoice available in recipient's AdE portal — seller's obligation fulfilled.
• NS — Notifica di Scarto: failed XSD or business-rule validation. Not issued; correct and resubmit within 5 days.
• EC — Notifica di Esito Committente: optional B2G/B2B accept/reject within 15 days.
• DT — Notifica di Decorrenza Termini: 15-day EC window expired silently → accepted.

The Five SdI Transmission Channels

Issuers connect via one of five technical channels: SdICoop (SOAP/HTTPS with mutual TLS — the standard for high-volume providers); SdIFtp (secure FTP batch flows, mostly legacy ERPs); PEC (attachment to [email protected] for very low-volume manual issuers); Web portal "Fatture e Corrispettivi" (AdE's free UI for taxpayers issuing <10/month); and SPC Cooperation (government-to-government). Commercial providers — Aruba, Fatture in Cloud, TeamSystem, Zucchetti and Zunapro for e-commerce — operate as intermediario delegato over SdICoop, sparing the taxpayer the need to maintain their own SdI integration.

3. Mandatory for B2B + B2C since 2019 — the Longest-Running EU Mandate

A Decade of Italian E-Invoicing

Italy began experimenting with structured e-invoicing for the Public Administration in 2014, became the first EU Member State to mandate it for all B2B and B2C from 1 January 2019, and on 1 January 2024 closed the last loophole by extending FatturaPA to the flat-rate forfettario regime (taxpayers below €25,000 turnover were the final exempt segment). No other EU country has comparable scope or longevity.

Legge 205/2017 — The Founding Mandate

The mandate is grounded in Legge 27 dicembre 2017 n. 205 (Legge di Bilancio 2018), article 1 commas 909–928. The law amended the Italian VAT decree (DPR 633/1972 article 21) and the Conservazione decree to make FatturaPA the only legally valid invoice form for VAT purposes in private-sector transactions. Cross-border transactions with non-EU/EU parties were brought inside the same framework from 1 January 2022 via the integrative TD17/TD18/TD19 codes, replacing the standalone esterometro.

The 2024 Forfettario Extension

From 1 January 2024 the mandate also covers the regime forfettario — Italy's simplified flat-rate regime for sole proprietors and freelancers under €85,000 annual revenue. The original 2019 mandate had carved out forfettari (and the legacy "regime di vantaggio"), but the EU's authorisation Decision 2018/593 was renewed in 2023 explicitly closing the carve-out. Around 1.5 million additional Partite IVA joined the mandate on that date.

Why Italy Went First

Pre-2019, Italy's VAT gap (the difference between theoretical and collected VAT) was estimated by the European Commission at roughly €33 billion / year — the largest in absolute terms in the EU. The clearance-model FatturaPA system was conceived as the most aggressive available remedy. Independent academic studies (Bank of Italy 2021, OECD 2023) credit the mandate with closing roughly €2–4 billion / year of VAT gap by its third anniversary, and the model is now the explicit reference design for the EU's ViDA (VAT in the Digital Age) Directive harmonising clearance e-invoicing across the bloc by 2030.

4. Codice Univoco — The Recipient Identifier

The 7-Character Routing Key

The Codice Univoco Destinatario tells the SdI where to deliver the FatturaPA. It is a 7-character alphanumeric code for private-sector B2B/B2C recipients and a 6-character code for B2G Public Administration recipients drawn from the official IPA (Indice delle Pubbliche Amministrazioni) registry at indicepa.gov.it. The XML field is CodiceDestinatario inside DatiTrasmissione.

How a B2B Codice Univoco Is Assigned

Private B2B recipients obtain their Codice Univoco from their e-invoicing provider (Aruba, Fatture in Cloud, TeamSystem, Zucchetti and dozens more), who registers the code in its SdI channel so any inbound FatturaPA carrying that code is routed correctly. Typical examples: KRRH6B9 (Aruba), M5UXCR1 (Fatture in Cloud), 0EVAQA5 (TeamSystem). A Partita IVA can publish its preferred channel in AdE "Fatture e Corrispettivi" under "Registrazione dell'indirizzo telematico" — once registered, the SdI always uses that channel, even if the issuer types something different in the XML.

B2C Fallbacks and 0000000

Private consumers usually do not have a Codice Univoco. The issuer then uses the placeholder 0000000 (seven zeros) and the SdI makes the invoice available in the consumer's personal AdE "Fatture e Corrispettivi" portal; the consumer can also receive a courtesy PDF/A copy by email. For B2G the 6-character IPA code identifies a specific ufficio, not the entire administration — large public bodies may have dozens of codes, one per spending unit.

5. PEC Delivery — Certified Email as Fallback

What PEC Is

PEC (Posta Elettronica Certificata) is Italy's legally certified email standard, defined by DPR 68/2005 and operated by AgID-accredited providers (Aruba PEC is the volume leader with ~10 million boxes, followed by Legalmail-InfoCert, Namirial PEC, Register.it and others). PEC delivers cryptographically signed delivery receipts (ricevuta di accettazione and ricevuta di consegna) that have the same legal probative value as registered post under Italian civil law.

Every Italian VAT-registered entity is legally required to maintain an active PEC address registered in the public INI-PEC (Indice Nazionale degli Indirizzi PEC) registry, published at inipec.gov.it. Failure to maintain a PEC carries an administrative fine and, for companies, can block Chamber of Commerce registry updates.

PEC in the FatturaPA Flow

Within the FatturaPA flow, PEC serves two distinct purposes:

• Secondary delivery channel: if the recipient has not pre-registered a Codice Univoco, the issuer can put 0000000 in CodiceDestinatario and the recipient's PEC address in PECDestinatario. The SdI then delivers the invoice straight to that PEC mailbox.
• Transmission channel for very low-volume issuers: a Partita IVA without a commercial provider can send their FatturaPA as a PEC attachment to the SdI's own address [email protected]. The SdI returns its esiti to the same PEC.

Practical Cautions

PEC delivery is slower and far less reliable than Codice Univoco. A full PEC mailbox produces an MC (Mancata Consegna) esito; the invoice is still legally valid but the recipient may not realise they have received it until they consult the AdE portal. For e-commerce sellers handling thousands of B2C orders, the recommended pattern is: Codice Univoco when the buyer provides one at checkout, 0000000 placeholder otherwise — and avoid mass PEC delivery to consumer addresses entirely.

6. Conservazione Sostitutiva — The 10-Year Archive

What Conservazione Means

Conservazione Sostitutiva a Norma is Italy's certified long-term archival regime — the digital equivalent of the pre-2014 paper "archivio cartaceo". It guarantees that FatturaPA XML files, SdI ricevute and XAdES-BES signatures remain intact, authentic, readable and inalterable for the full 10-year retention period required by DPR 633/1972 art. 39 and the Italian Civil Code.

The AgID Linee Guida 2022

Rules are set out in the AgID Linee Guida sulla formazione, gestione e conservazione dei documenti informatici (in force from 1 January 2022) combined with DMEF 17 giugno 2014. Requirements: digital signature on the "pacchetto di archiviazione" by the Responsabile della Conservazione; marca temporale (qualified time-stamp) refreshed periodically; a written Manuale della Conservazione; versamento by the end of the third month after the fiscal year (2026 fatture by 31 March 2026); 10-year retention with on-demand AdE access via the Esibizione procedure.

AgID-Accredited Conservatori

Conservazione cannot be done in-house except by very large enterprises with their own AgID accreditation. The market is served by a short list of accredited Conservatori: Aruba, InfoCert, Namirial, Zucchetti DocFinance, TeamSystem, Postel (Poste Italiane) and a handful of niche players. The list is published at agid.gov.it/it/piattaforme/conservazione. If AdE opens an inspection, the taxpayer must produce each requested FatturaPA — with its SdI ricevute, signature chain and time-stamps — in inspector-readable format within tight deadlines; failure to esibire is a separate sanctionable offence.

7. Integration with the Agenzia delle Entrate

The Fatture e Corrispettivi Portal

Every Italian Partita IVA has a dedicated workspace inside the AdE Fatture e Corrispettivi portal (ivaservizi.agenziaentrate.gov.it/portale). It consolidates all inbound and outbound FatturaPA processed by the SdI, all corrispettivi elettronici from Registratori Telematici (RT), pre-compiled IVA registers (vendite + acquisti), pre-compiled LIPE quarterly liquidations and the annual Dichiarazione IVA. The pre-compilation feature, rolled out progressively since 2022, is the mandate's most important downstream benefit: AdE now drafts LIPE and Dichiarazione IVA on the taxpayer's behalf, with the commercialista only confirming or adjusting. For a marketplace seller running thousands of monthly fatture, this turns IVA filing from manual reconciliation into a review step.

AdE APIs and SPID / CIE / CNS Access

Access requires Italian digital identity: SPID (issued by Aruba ID, Poste ID, InfoCert ID, TIM ID, Namirial ID — the dominant scheme), CIE (Carta d'Identità Elettronica, the chipped national ID), CNS (smartcard via Chambers of Commerce) or legacy Fisconline / Entratel credentials. Commercialisti and providers act as intermediario abilitato on behalf of the Partita IVA via a digital delega, so the taxpayer rarely interacts with the portal directly once the provider chain is set up.

Esterometro Replacement and TD17/18/19

Until June 2022 cross-border transactions were reported via the standalone esterometro. Since 1 July 2022 that form is gone: cross-border purchases and sales are reported by issuing integrative FatturaPA with TD17 (services from foreign provider), TD18 (intra-EU acquisitions), TD19 (purchases from foreign warehouse for goods physically in Italy). The 15-day deadline from the foreign document is strict.

8. Software Providers — Aruba, Fatture in Cloud, TeamSystem, Zucchetti

Aruba — The Volume Leader

Aruba S.p.A. (Bibbiena, Arezzo) is the volume leader thanks to a tightly integrated stack: Aruba PEC is the #1 PEC operator with ~10 million boxes; Aruba Fatturazione Elettronica bundles SdI transmission, recipient routing and a self-service web UI; Aruba Conservazione Digitale is one of the largest AgID-accredited Conservatori; and Aruba ID is a major SPID provider. Entry-level FatturaPA plans start around €25/year, which is why Aruba dominates the micro-business segment.

Fatture in Cloud — The SME SaaS Favourite

Fatture in Cloud was founded in 2013 in Mantua and acquired by TeamSystem in 2017, but continues to operate as an autonomous product brand. Clean web UI, Open API, native Zapier integration and 500K+ active SMEs make it the de facto standard for small e-commerce sellers and digital agencies. SdI integration is invisible — issue in the web app and the invoice appears in the buyer's "Fatture e Corrispettivi" seconds later.

TeamSystem — Mid-Market and Studi Commercialisti

TeamSystem S.p.A. (Pesaro) is Italy's largest software vendor for commercialisti (chartered accountants) and mid-market enterprises. Lynfa, Polyedro and ACG cover accounting, HR, payroll, e-commerce and FatturaPA across 2 million+ business customers. For any Italian company served by a commercialista studio, the FatturaPA flow is almost always TeamSystem-powered upstream.

Zucchetti & the Trust Services Layer

Zucchetti S.p.A. (Lodi) is the largest privately-owned ERP and HR vendor in Italy. DocFinance treasury + Conservazione sits at the heart of the enterprise FatturaPA flow. Zucchetti dominates mid-to-large enterprise and the public sector. Underneath the four mainstream brands sits the qualified Trust Service Provider layer regulated under eIDAS — InfoCert (Tinexta Group), Namirial and Poste Italiane — providing qualified digital signatures, time-stamps, PEC and SPID to many other SaaS tools, Zunapro included.

9. Penalties for Non-Compliance

The Core Sanction Framework — DLgs 471/1997

FatturaPA non-compliance is sanctioned under Decreto Legislativo 471/1997 article 6, the general Italian VAT documentation sanction. The headline penalties are:

• Non-electronic invoice when FatturaPA is mandatory: fine equal to 90% to 180% of the VAT not correctly documented, with a minimum of €500 per invoice.
• Late SdI submission: same proportional range; mitigated by ravvedimento operoso.
• Omitted submission: same range plus the issuer remains personally liable for the VAT until the invoice is regularised.
• Conservazione failures: separate fine of €1,000 to €10,000 per breach under DLgs 472/1997, escalating for repeat violations.
• Inbound invoice not in conservation: similar fine band; the purchaser is liable.

Ravvedimento Operoso — Voluntary Correction

The Italian tax code's ravvedimento operoso mechanism allows the taxpayer to spontaneously correct an error before AdE acts on it. Penalties scale down to as little as 1/10 of the minimum if the correction happens within 30 days, and up to 1/5 if within the annual deadline. For FatturaPA late filings this means a €500 minimum drops to €50 if corrected quickly — a strong incentive to remediate proactively.

Repeat and Systemic Violations

AdE's data analytics platform cross-references SdI flows, JPK-style transmissions, bank movements, e-commerce platform reports and corrispettivi elettronici streams. Systemic FatturaPA gaps almost guarantee an inspection. Serious or fraudulent under-issuance can trigger criminal referral under DLgs 74/2000 — the "reato di occultamento o distruzione di documenti contabili" carries prison sentences from 18 months to 6 years.

Practical Risk Profile for E-Commerce Sellers

For an e-commerce seller running 2,000+ Italian orders per month, even a 1% FatturaPA failure rate quickly compounds: 20 missing invoices a month × €500 minimum = €10,000 / month, before VAT recovery. AdE's pre-compilation makes gaps trivially visible at LIPE time, so the practical answer is not to tolerate any failure rate. This is the structural argument for an automated SdI flow.

10. International — Foreign Companies with Italian Customers

Direct VAT Identification vs Fiscal Representative

A non-Italian company can sell into Italy under three legal frameworks. EU-established companies register directly with AdE under DPR 633/1972 art. 35-ter (Rappresentanza Diretta). Non-EU residents (UK, US, Turkey, China) must appoint an Italian-resident Rappresentante Fiscale, jointly liable for VAT and FatturaPA compliance. For B2C distance sales below thresholds, EU companies can also use OSS and skip Italian registration entirely — but as soon as a B2B Italian Partita IVA customer enters the picture, FatturaPA / TD17 obligations arrive.

The 1 July 2022 Mandate for Foreign Sellers

From 1 July 2022 foreign companies with an Italian VAT number must issue FatturaPA via the SdI exactly like Italian residents. The transitional grace period for cross-border paper invoices ended on that date. The integrative TD17/TD18/TD19 codes replaced the esterometro form and became the only legal reporting channel.

Practical Setup for a Foreign E-Commerce

For a Turkish, German or UK seller already operating on Amazon.it, ePRICE or via a Shopify Italian-language storefront, the recommended 2026 stack is: Italian Partita IVA via direct identification (EU) or fiscal representative (non-EU, 2–6 weeks); FatturaPA provider (Aruba or Fatture in Cloud are easiest, both accept foreign legal entities); PEC mailbox in INI-PEC; AgID Conservazione bundled with the provider; and Zunapro as the e-commerce + marketplace + invoice orchestrator pushing FatturaPA into the provider's SdI channel automatically. Italian e-commerce buying from foreign suppliers must also self-issue TD17/TD18/TD19 integrative FatturaPA within 15 days of the foreign document.

Italian E-Invoicing Stack 2026 — Provider Comparison

The single most useful artefact for choosing a provider is a side-by-side capability view. The table below summarises the four dominant providers across SdI transmission, Conservazione, PEC and e-commerce integration.

Provider	SdI Transmission	Conservazione	PEC Bundle	Ideal Segment
Aruba	SdICoop · intermediario	AgID-accredited (in-house)	Aruba PEC bundled	Micro-business · low cost
Fatture in Cloud	SdICoop via TeamSystem	Via TeamSystem partners	PEC add-on (Aruba / Legalmail)	SME · SaaS · e-commerce SMBs
TeamSystem	SdICoop · intermediario	AgID-accredited (in-house)	Legalmail (InfoCert) bundled	Mid-market · commercialisti
Zucchetti	SdICoop · intermediario	AgID-accredited (DocFinance)	PEC via partners	Enterprise · public sector
InfoCert / Namirial	SdICoop (white-label)	AgID-accredited (in-house)	Legalmail / Namirial PEC	Trust services backbone
Zunapro	Orchestrates the provider of your choice · auto-pushes marketplace orders into Aruba / FIC / TeamSystem / Zucchetti SdI flow			E-commerce + marketplace seller

Reading the table: Aruba wins on price and bundle simplicity for micro-business. Fatture in Cloud wins on SaaS UX for SMEs. TeamSystem and Zucchetti are the enterprise / commercialista standards. Zunapro orchestrates on top — it does not replace the provider, it automates the flow into whichever one you (or your commercialista) prefer.

Italian Legal Framework 2026 — What Governs FatturaPA

The Core Legal Stack

Italian e-invoicing rests on a layered legal stack. The most important sources are Legge 205/2017 art. 1 cc. 909–928 (founding mandate), DPR 633/1972 art. 21 (Decreto IVA), DLgs 127/2015 (original e-invoicing decree), DMEF 17 giugno 2014 + AgID Linee Guida 2022 (Conservazione), DLgs 471/1997 and 472/1997 (VAT documentation penalties), DLgs 74/2000 (criminal tax law), DPR 68/2005 (PEC) and the EU ViDA Directive 2024-2026 that takes Italy's clearance model bloc-wide by 2030. Implementing detail lives in the Provvedimenti del Direttore dell'Agenzia delle Entrate — the operational manual for the SdI.

IVA — Italian VAT in 2026

Italian VAT (IVA — Imposta sul Valore Aggiunto) standard rate is 22%, with reduced rates of 10% (tourism, certain foods), 5% (selected social services) and 4% (basic foods, books, medical aids). Every FatturaPA declares the rate per line and AdE's pre-compilation cross-checks. Italy does not use Poland's JPK_VAT mechanism — the SdI feed is the source of truth, and AdE compiles LIPE quarterly and the annual Dichiarazione IVA directly from it. The esterometro was abolished on 1 July 2022 and replaced by TD17/TD18/TD19 integrative codes inside FatturaPA.

Consumer Protection & Sectoral Obligations

GDPR is enforced by the Garante per la Protezione dei Dati Personali; FatturaPA personal data sits inside the SdI joint-controllership. The Codice del Consumo (DLgs 206/2005) implements the EU 14-day right of withdrawal and the 2-year garanzia legale di conformità for B2C. Sectoral registers include RAEE / WEEE (Centro di Coordinamento RAEE) for electronics, CONAI EPR Imballaggi for packaging and CE marking for regulated product categories.

How to Start FatturaPA in Italy — 2026 Step-by-Step

1. Choose Your Provider

• Micro-business / freelancer / minimum cost → Aruba
• SME with SaaS preference, e-commerce friendly → Fatture in Cloud
• Mid-market, served by a commercialista studio → TeamSystem
• Enterprise, public sector, complex ERP → Zucchetti

The typical winning configuration for an Italian e-commerce SME in 2026 is Fatture in Cloud + Aruba PEC + bundled Conservazione + Zunapro as the e-commerce orchestrator.

2. Partita IVA, PEC, SPID and Codice Univoco

Open an Italian Partita IVA (Ditta Individuale in ~1 week via Fisconline, S.r.l.s. in 2–4 weeks via a notaio, or EU direct VAT identification under DPR 633/1972 art. 35-ter). Open an active PEC in INI-PEC (Aruba, Legalmail-InfoCert, Namirial). Get a SPID identity for the legal representative. Obtain a Codice Univoco Destinatario from your provider and register it in AdE "Fatture e Corrispettivi" as your default inbound channel.

3. Conservazione Sostitutiva Activation

Sign the Manuale della Conservazione and the contratto di affidamento with your AgID-accredited Conservatore (Aruba, Zucchetti DocFinance, InfoCert, Namirial, TeamSystem). Every FatturaPA issued from go-live must flow into Conservation; backfilling later is possible but procedurally expensive.

4. Connect via Zunapro (10-Minute Integration)

1. Sign in to Zunapro and open the Italy module.
2. Connect your FatturaPA provider — paste API keys / OAuth into the Aruba, Fatture in Cloud, TeamSystem or Zucchetti tile.
3. Map your catalog — Zunapro auto-suggests TD codes (TD01, TD24); confirm with a few clicks.
4. Enable SdI + Conservazione + AdE pre-compilation — single toggle each.
5. Go live — first SdI submission completes in roughly 10 seconds.

Italian FatturaPA FAQ 2026