Italy · SDI Sending Invoices Guide

🇮🇹 Generate and issue electronic invoices through Italy’s SDI system

Introduction

Electronic invoicing is mandatory for all businesses in Italy. The Sistema di Interscambio (SDI) serves as the Italian government’s central hub for transmitting, validating, and delivering all electronic invoices throughout the country.

The SDI system operates using a standardized XML format called FatturaPA, which ensures all invoices contain the required information and comply with the strict validation rules established by the Italian tax authority (Agenzia delle Entrate). To ensure proper routing of invoices to the correct recipient, the SDI system uses a unique identifier called a Recipient Code, which is assigned to each registered SDI provider.

Invopop simplifies SDI integration by allowing you to work with GOBL format instead of XML, providing synchronous validation before submission, and offering a simple API integration with automatic handling of SDI notifications and status updates. For receiving invoices through SDI, see our companion guide: Italy - SDI: Receiving Invoices.

Setup

1. Connect the SDI Italy app

   1. Navigate to Configuration → Apps
   2. Locate SDI Italy in the app discovery list
   3. Tap Connect to activate

   The initial connection requires no configuration for sending invoices.

2. Configure sending workflow

   SDI does not have a sandbox environment. When sandbox mode is selected, Invopop’s third-party submission service, A-Cube, simulates a response from SDI.

   Template

   Send SDI Invoice workflow

   Signs and converts the GOBL document into the FatturaPA XML format and then sends it to SDI.

   Select a workspace to use this template

   Send SDI Invoice workflow

   Signs and converts the GOBL document into the FatturaPA XML format and then sends it to SDI.

   Select a workspace to use this template

   Copy and paste into a new Empty Invoice workflow code view.

   {
       "name": "Invoice - Send with States",
       "description": "Generate and issue an invoice through SDI and set the state to `sent` if successful",
       "steps": [
           {
               "id": "1a692ae0-cd12-11ef-998c-e97f18c9212e",
               "name": "Set State",
               "provider": "silo.state",
               "summary": "Set state to `processing`{.state .processing}",
               "config": {
                   "state": "processing"
               }
           },
           {
               "id": "1855b430-cd12-11ef-998c-e97f18c9212e",
               "name": "Sign Envelope",
               "provider": "silo.close"
           },
           {
               "id": "24f5c340-fd12-11ef-998c-e97f18c9212e",
               "name": "Generate FatturaPA",
               "provider": "sdi-it.generate",
               "summary": "Create XML document"
           },
           {
               "id": "2042f860-cd12-11ef-998c-e97f18c9212e",
               "name": "Send to SDI (Italy)",
               "provider": "sdi-it.send",
               "summary": "Sandbox · Accepted by PA (Notifica esito)",
               "config": {
                   "environment": "sandbox",
                   "response": "NE"
               }
           },
           {
               "id": "236965b0-cd12-11ef-998c-e97f18c9212e",
               "name": "Generate PDF",
               "provider": "pdf",
               "summary": "Italian",
               "config": {
                   "date_format": "%Y-%m-%d",
                   "locale": "it",
                   "logo_height": 40
               }
           },
           {
               "id": "2b6db450-cd12-11ef-998c-e97f18c9212e",
               "name": "Set State",
               "provider": "silo.state",
               "summary": "Set state to `sent`{.state .sent}",
               "config": {
                   "state": "sent"
               }
           }
       ],
       "rescue": [
           {
               "id": "2d5d7660-cd12-11ef-998c-e97f18c9212e",
               "name": "Set State",
               "provider": "silo.state",
               "summary": "Set state to `error`{.state .error}",
               "config": {
                   "state": "error"
               }
           }
       ]
   }
   

   Before starting, review the workflows guide to understand the general setup process.

   In Console, create a new workflow and choose Empty Invoice workflow as the base. Then add the following steps:

   1. Set State - To “Processing”.
   2. Sign Envelope - Signs the GOBL document. This can be substituted with Add Sequential Code with the Sign Document option enabled.
   3. Generate FatturaPA - Converts the GOBL document to FatturaPA XML format and attaches it to the original invoice entry.
   4. Send to SDI (Italy) - Takes the generated XML attachment and sends it to SDI. If sandbox is chosen as the environment, the simulated response from SDI must be set.
   5. Set State - To “Sent”.

   In the Error Handling section, add a Set State step with the state set to "Error" to capture and flag failed imports.

   This is the minimal workflow with state handling required to automate the reception and visualization of invoices received through SDI. You may expand it with additional steps such as storing a backup copy, notifying clients, or integrating the documents into an ERP system.

Sending Invoices

Invopop uses the GOBL FatturaPA library to process conversions. When creating invoices for SDI, you need to:

1. Set the regime field to IT in your GOBL invoice
2. Add the it-sdi-v1 addon to enable Italian-specific validations and extensions

Detailed information about the SDI-specific extensions and validations can be found in:

• Italy SDI FatturaPA v1.x Addon Documentation
• Italy Tax Regime Documentation

Example invoices are provided below, or you can use the GOBL Builder to create custom invoices.

How the process works

1. Generate FatturaPA

   This step converts a GOBL invoice into the required FatturaPA XML format and stores it as an attachment to the silo entry.

2. Send to SDI

   This step takes the generated XML attachment and sends it to SDI through our integration partner. The SDI service usually responds within seconds but may take up to 24 hours. While waiting, this step remains in a Queued state.

When the Send step completes, it returns one of three results:

• OK if successful
• KO for unrecoverable errors
• SKIP if the invoice was already sent

Example Invoices

B2C Standard Invoice

SDI B2B Invoice

{
    "$schema": "https://gobl.org/draft-0/bill/invoice",
    "$regime": "IT",
    "$addons": [
        "it-sdi-v1"
    ],
    "$tags": [
        "freelance"
    ],
    "uuid": "0190c0ec-8109-756b-a4f0-88c4b542ab6e",
    "type": "standard",
    "series": "SAMPLE",
    "code": "001",
    "issue_date": "2023-03-02",
    "currency": "EUR",
    "tax": {
        "ext": {
            "it-sdi-document-type": "TD06",
            "it-sdi-format": "FPR12"
        }
    },
    "supplier": {
        "name": "MªF. Services",
        "tax_id": {
            "country": "IT",
            "code": "12345678903"
        },
        "people": [
            {
                "name": {
                    "given": "GIANCARLO",
                    "surname": "ROSSI"
                }
            }
        ],
        "addresses": [
            {
                "num": "1",
                "street": "VIALE DELLA LIBERTÀ",
                "locality": "ROMA",
                "region": "RM",
                "code": "00100",
                "country": "IT"
            }
        ],
        "ext": {
            "it-sdi-fiscal-regime": "RF01"
        }
    },
    "customer": {
        "name": "MARIO LEONI",
        "tax_id": {
            "country": "IT",
            "code": "09876543217"
        },
        "addresses": [
            {
                "num": "32",
                "street": "VIALE DELI LAVORATORI",
                "locality": "FIRENZE",
                "region": "FI",
                "code": "50100",
                "country": "IT"
            }
        ]
    },
    "lines": [
        {
            "i": 1,
            "quantity": "20",
            "item": {
                "name": "Development services",
                "price": "90.00",
                "unit": "h"
            },
            "sum": "1800.00",
            "taxes": [
                {
                    "cat": "VAT",
                    "rate": "standard",
                    "percent": "22.0%"
                }
            ],
            "total": "1800.00"
        }
    ],
    "totals": {
        "sum": "1800.00",
        "total": "1800.00",
        "taxes": {
            "categories": [
                {
                    "code": "VAT",
                    "rates": [
                        {
                            "key": "standard",
                            "base": "1800.00",
                            "percent": "22.0%",
                            "amount": "396.00"
                        }
                    ],
                    "amount": "396.00"
                }
            ],
            "sum": "396.00"
        },
        "tax": "396.00",
        "total_with_tax": "2196.00",
        "payable": "2196.00"
    }
}

B2B Invoice

SDI B2B Invoice

{
    "$schema": "https://gobl.org/draft-0/bill/invoice",
    "$regime": "IT",
    "$addons": [
        "it-sdi-v1"
    ],
    "$tags": [
        "freelance"
    ],
    "uuid": "0190c0ec-8109-756b-a4f0-88c4b542ab6e",
    "type": "standard",
    "series": "SAMPLE",
    "code": "001",
    "issue_date": "2023-03-02",
    "currency": "EUR",
    "tax": {
        "ext": {
            "it-sdi-document-type": "TD06",
            "it-sdi-format": "FPR12"
        }
    },
    "supplier": {
        "name": "MªF. Services",
        "tax_id": {
            "country": "IT",
            "code": "12345678903"
        },
        "people": [
            {
                "name": {
                    "given": "GIANCARLO",
                    "surname": "ROSSI"
                }
            }
        ],
        "addresses": [
            {
                "num": "1",
                "street": "VIALE DELLA LIBERTÀ",
                "locality": "ROMA",
                "region": "RM",
                "code": "00100",
                "country": "IT"
            }
        ],
        "ext": {
            "it-sdi-fiscal-regime": "RF01"
        }
    },
    "customer": {
        "name": "MARIO LEONI",
        "tax_id": {
            "country": "IT",
            "code": "09876543217"
        },
        "addresses": [
            {
                "num": "32",
                "street": "VIALE DELI LAVORATORI",
                "locality": "FIRENZE",
                "region": "FI",
                "code": "50100",
                "country": "IT"
            }
        ]
    },
    "lines": [
        {
            "i": 1,
            "quantity": "20",
            "item": {
                "name": "Development services",
                "price": "90.00",
                "unit": "h"
            },
            "sum": "1800.00",
            "taxes": [
                {
                    "cat": "VAT",
                    "rate": "standard",
                    "percent": "22.0%"
                }
            ],
            "total": "1800.00"
        }
    ],
    "totals": {
        "sum": "1800.00",
        "total": "1800.00",
        "taxes": {
            "categories": [
                {
                    "code": "VAT",
                    "rates": [
                        {
                            "key": "standard",
                            "base": "1800.00",
                            "percent": "22.0%",
                            "amount": "396.00"
                        }
                    ],
                    "amount": "396.00"
                }
            ],
            "sum": "396.00"
        },
        "tax": "396.00",
        "total_with_tax": "2196.00",
        "payable": "2196.00"
    }
}

B2B Invoice with Additional Fields

SDI B2B Invoice with additional fields

{
  "$schema": "https://gobl.org/draft-0/bill/invoice",
  "$regime": "IT",
  "$addons": [
    "it-sdi-v1"
  ],
  "$tags": [
    "freelance"
  ],
  "uuid": "0190c0ec-8109-756b-a4f0-88c4b542ab6e",
  "type": "standard",
  "series": "SAMPLE",
  "code": "001",
  "issue_date": "2023-03-02",
  "currency": "EUR",
  "tax": {
    "ext": {
      "it-sdi-document-type": "TD06",
      "it-sdi-format": "FPR12"
    }
  },
  "supplier": {
    "name": "MªF. Services",
    "tax_id": {
      "country": "IT",
      "code": "12345678903"
    },
    "people": [
      {
        "name": {
          "given": "GIANCARLO",
          "surname": "ROSSI"
        }
      }
    ],
    "addresses": [
      {
        "num": "1",
        "street": "VIALE DELLA LIBERTÀ",
        "locality": "ROMA",
        "region": "RM",
        "code": "00100",
        "country": "IT"
      }
    ],
    "emails": [
      {
        "addr": "[e-mail]"
      }
    ],
    "telephones": [
      {
        "num": "999999999"
      }
    ],
    "registration": {
      "capital": "50000.00",
      "currency": "EUR",
      "office": "RM",
      "entry": "123456"
    },
    "ext": {
      "it-sdi-fiscal-regime": "RF02"
    }
  },
  "customer": {
    "name": "MARIO LEONI",
    "tax_id": {
      "country": "IT",
      "code": "09876543217"
    },
    "people": [
      {
        "name": {
          "prefix": "Dott.",
          "given": "MARIO",
          "surname": "LEONI"
        }
      }
    ],
    "inboxes": [
      {
        "key": "it-sdi-code",
        "code": "ABCDEF1"
      }
    ],
    "addresses": [
      {
        "num": "32",
        "street": "VIALE DELI LAVORATORI",
        "locality": "FIRENZE",
        "region": "FI",
        "code": "50100",
        "country": "IT"
      }
    ],
    "emails": [
      {
        "addr": "[e-mail]"
      }
    ]
  },
  "lines": [
    {
      "i": 1,
      "quantity": "20",
      "item": {
        "name": "Development services",
        "price": "90.00",
        "unit": "h"
      },
      "sum": "1800.00",
      "discounts": [
        {
          "reason": "Special discount",
          "percent": "10%",
          "amount": "180.00"
        }
      ],
      "taxes": [
        {
          "cat": "VAT",
          "rate": "standard",
          "percent": "22.0%"
        }
      ],
      "total": "1620.00"
    },
    {
      "i": 2,
      "quantity": "1",
      "item": {
        "name": "Special Untaxed Work",
        "price": "100.00",
        "unit": "h"
      },
      "sum": "100.00",
      "taxes": [
        {
          "cat": "VAT",
          "rate": "exempt",
          "ext": {
            "it-sdi-exempt": "N2.2",
            "it-sdi-vat-liability": "S"
          }
        }
      ],
      "total": "100.00"
    }
  ],
  "discounts": [
    {
      "i": 1,
      "reason": "10th year anniversary discount",
      "base": "1720.00",
      "percent": "50%",
      "amount": "860.00"
    }
  ],
  "charges": [
    {
      "i": 1,
      "reason": "10th year anniversary charge",
      "base": "1720.00",
      "percent": "10%",
      "amount": "172.00"
    }
  ],
  "payment": {
    "instructions": {
      "key": "card",
      "ext": {
        "it-sdi-payment-means": "MP08"
      }
    }
  },
  "totals": {
    "sum": "1720.00",
    "discount": "860.00",
    "charge": "172.00",
    "total": "1032.00",
    "taxes": {
      "categories": [
        {
          "code": "VAT",
          "rates": [
            {
              "key": "standard",
              "base": "1620.00",
              "percent": "22.0%",
              "amount": "356.40"
            },
            {
              "key": "exempt",
              "ext": {
                "it-sdi-exempt": "N2.2",
                "it-sdi-vat-liability": "S"
              },
              "base": "100.00",
              "amount": "0.00"
            }
          ],
          "amount": "356.40"
        }
      ],
      "sum": "356.40"
    },
    "tax": "356.40",
    "total_with_tax": "1388.40",
    "payable": "1388.40"
  }
}

Credit Note

SDI Credit Note

{
    "$schema": "https://gobl.org/draft-0/bill/invoice",
    "$regime": "IT",
    "$addons": [
        "it-sdi-v1"
    ],
    "$tags": [
        "freelance"
    ],
    "uuid": "019270f3-513e-71e2-b2e3-47f8321a09ac",
    "type": "credit-note",
    "series": "CN",
    "code": "001",
    "issue_date": "2024-10-09",
    "currency": "EUR",
    "preceding": [
        {
            "uuid": "0190c0ec-8109-756b-a4f0-88c4b542ab6e",
            "type": "standard",
            "issue_date": "2023-03-02",
            "series": "SAMPLE",
            "code": "001"
        }
    ],
    "tax": {
        "ext": {
            "it-sdi-document-type": "TD04",
            "it-sdi-format": "FPR12"
        }
    },
    "supplier": {
        "name": "MªF. Services",
        "tax_id": {
            "country": "IT",
            "code": "12345678903"
        },
        "people": [
            {
                "name": {
                    "given": "GIANCARLO",
                    "surname": "ROSSI"
                }
            }
        ],
        "addresses": [
            {
                "num": "1",
                "street": "VIALE DELLA LIBERTÀ",
                "locality": "ROMA",
                "region": "RM",
                "code": "00100",
                "country": "IT"
            }
        ],
        "registration": {
            "capital": "50000.00",
            "currency": "EUR",
            "office": "RM",
            "entry": "123456"
        },
        "ext": {
            "it-sdi-fiscal-regime": "RF02"
        }
    },
    "customer": {
        "name": "MARIO LEONI",
        "tax_id": {
            "country": "IT",
            "code": "09876543217"
        },
        "people": [
            {
                "name": {
                    "prefix": "Dott.",
                    "given": "MARIO",
                    "surname": "LEONI"
                }
            }
        ],
        "addresses": [
            {
                "num": "32",
                "street": "VIALE DELI LAVORATORI",
                "locality": "FIRENZE",
                "region": "FI",
                "code": "50100",
                "country": "IT"
            }
        ]
    },
    "lines": [
        {
            "i": 1,
            "quantity": "20",
            "item": {
                "name": "Development services",
                "price": "90.00",
                "unit": "h"
            },
            "sum": "1800.00",
            "taxes": [
                {
                    "cat": "VAT",
                    "rate": "standard",
                    "percent": "22.0%"
                }
            ],
            "total": "1800.00"
        }
    ],
    "totals": {
        "sum": "1800.00",
        "total": "1800.00",
        "taxes": {
            "categories": [
                {
                    "code": "VAT",
                    "rates": [
                        {
                            "key": "standard",
                            "base": "1800.00",
                            "percent": "22.0%",
                            "amount": "396.00"
                        }
                    ],
                    "amount": "396.00"
                }
            ],
            "sum": "396.00"
        },
        "tax": "396.00",
        "total_with_tax": "2196.00",
        "payable": "2196.00"
    }
}

FAQ

Is electronic invoicing mandatory in Italy?

Yes, electronic invoicing through SDI is mandatory in Italy for B2G, B2B, and B2C transactions.

All invoices must be issued in FatturaPA format and transmitted through the SDI (Sistema di Interscambio) platform.

How can I correct an invoice?

There are two main ways to correct an invoice in the Italian SDI system:

1. Issue a credit note (Nota di Credito - TD04) to fully or partially cancel the original invoice.
2. Issue a debit note (Nota di Debito - TD05) to integrate/correct the original invoice with additional charges.

The corrective document must reference the original invoice number and date.

Why is my invoice processing taking so long?

The SDI system can take up to 24 hours to process invoices, especially during peak periods. While waiting, the “Send to SDI” step will remain in the QUEUED state. The system will automatically check for updates, and the status will change once SDI has processed the invoice.

How do I know if my invoice was delivered successfully?

Once the SDI process is complete, the workflow will show one of several status codes:

• delivered - The invoice was successfully delivered to a B2B recipient
• accepted-pa - The invoice was accepted by a Public Administration
• not-delivered - The invoice couldn’t be delivered, but was processed correctly by SDI

Check the workflow history to see the exact status.

Can I use the same workflow for both sending and receiving invoices?

No, sending and receiving invoices require different workflows:

• For sending invoices, a workflow with the Generate FatturaPA and Send to SDI steps is needed
• For receiving invoices, two workflows are required:
  1. A Customer Registration workflow (run once for each company that needs to receive invoices)
  2. An Import Invoices workflow (configured to run automatically)

For more information on receiving invoices, see our Italy - SDI: Receiving Invoices guide.

How do I add codice fiscale and Partita IVA

Invopop handles both Italian tax identification numbers in the supplier and customer sections of invoices:

• Partita IVA (VAT number): Automatically extracted from the tax_id/code field.
• Codice Fiscale (fiscal code): Must be specified as an identity with the key it-fiscal-code.

Here’s an example showing both identifiers in a supplier object:

Supplier with Partita IVA and Codice Fiscale

{
    "supplier": {
        "name": "MªF. Services",
        "tax_id": {
            "country": "IT",
            "code": "12345678903"
        },
        "identities": [
            {
                "key": "it-fiscal-code",
                "code": "MRTMTT91D08F205J"
            }
        ],
    }
}

For more information on receiving invoices, see our Italy - SDI: Receiving Invoices guide.

Technical Details

SDI Response Codes and Statuses

When the SDI step processes a document, it returns detailed status codes that provide information about the response from SDI:

Code	Description
rejected	Notifica di scarto (NS) SDI has rejected the invoice because it contains errors.
delivered	Ricevuta consegna (RC) SDI has successfully delivered a B2B invoice to the recipient.
delivered-pa	Ricevuta consegna (RC) SDI has successfully delivered an invoice to a Public Administration (PA).
not-delivered	Mancata consegna (MC) SDI could not deliver the invoice to the recipient.
not-delivered	Attestazione trasmissione con impossibilità di recapito (AT) SDI couldn’t deliver an invoice to PA after 10 days.
accepted-pa	Notifica esito (NE) A PA has decided to accept an invoice (outcome EC01).
rejected-pa	Notifica esito (NE) A PA has decided to reject an invoice (outcome EC02).
deadline-terms	Notifica decorrenza termini (DT) A PA didn’t reply with acceptance or rejection within 15 days.
invoice-error	An error occurred during the acquisition of a notification.
sent	The invoice has been submitted to SDI and is awaiting a response.
not-received	The invoice was not received by the recipient.

Some SDI notifications (File metadati - MT, Esito committente - EC, Scarto esito committente - SE) don’t directly change the code of the invoice.

These codes map to different step results as follows:

• OK Result: delivered, not-delivered, not-received, accepted-pa
• KO Result: rejected, rejected-pa, invoice-error, deadline-terms
• QUEUED Result: sent, delivered-pa

When a step returns QUEUED, the workflow will check again later for updates from SDI.