By when must an electronic invoice be issued?

What Is the 12-Day Rule?

Under Italian VAT law (D.P.R. 633/1972, as amended by the e-invoicing rules), every VAT-registered freelancer is required to issue and electronically transmit an invoice to the Sistema di Interscambio (SDI) — the Italian Revenue Agency's e-invoicing hub — within 12 days of the taxable event.

This rule applies to freelancers operating under both the Flat Rate (Regime Forfettario) and Simplified (Regime Semplificato) accounting regimes.

Think of it this way: once something triggers the obligation to invoice, you have a 12-calendar-day window to get that invoice into SDI. The clock doesn't stop for weekends or public holidays.

When Does the 12-Day Period Start?

The 12-day countdown begins on the date of the taxable event — whichever of these two happens first:

1. Payment received The moment you receive full or partial payment from your client, the obligation is triggered. This is the most common scenario for freelancers: you invoice after getting paid.

2. Service completed If your service is fully delivered (e.g., a project handed over, a report submitted, a consultation concluded) but payment hasn't arrived yet, the taxable event still occurs on the completion date.

The key principle: whichever comes first — payment or completion — starts the 12-day clock.

Does a Draft Invoice Count?

No. A draft invoice has no fiscal or legal validity in Italy. Here's what you need to know about the difference:

A draft is a working document — useful for reviewing details before you commit. Only when you finalise and transmit the invoice through Xolo does it reach SDI and become legally binding. 

What Happens If I Miss the Deadline?

Missing the 12-day window is a late issuance — not an invalidation of the invoice. The invoice is still valid and must still be submitted. Here's what you should know:

The invoice is still valid and must be issued. Do not leave the invoice unissued simply because the deadline has passed. An unissued invoice is always worse than a late one.

Late issuance may constitute a violation. Under Italian tax law, late transmission to SDI can be considered an administrative infraction, potentially subject to penalties.

Penalties depend on circumstances. The severity depends on factors such as: how late the submission is, whether it affected a VAT settlement period, whether it was a one-off or repeated, and whether you self-correct before any tax authority action.

Voluntary regularisation (ravvedimento operoso) may reduce penalties. If you act promptly and self-correct, Italian law allows for reduced penalties through a formal procedure. The sooner you act, the greater the reduction.

Practical Examples

Example 1 — Payment received first (most common scenario)

A client pays you on 1 March. You deliver the final report on 10 March.

The taxable event is 1 March (payment came first). You must submit the e-invoice to SDI by 13 March (1 March + 12 days). Delivering the service later does not reset the clock.

Example 2 — Service completed before payment

You hand over a completed website on 5 April. The client pays you on 20 April.

The taxable event is 5 April (service completion came first). You must submit the e-invoice to SDI by 17 April. Waiting for payment before invoicing is a common mistake here — the obligation began when you delivered the work.

Example 3 — Late issuance scenario

A client pays you on 1 June. Due to a busy period, you don't create the final e-invoice until 20 June — 19 days after the taxable event.

The invoice is late. You should still issue and submit it immediately via Xolo. You may be subject to a penalty, but taking prompt corrective action (see checklist below) can reduce or eliminate it. Do not leave the invoice as a draft or skip it entirely.

I Missed the 12-Day Deadline — What Should I Do Now?

First: don't panic. Late issuance happens, and there is a clear path to remediation. Follow these steps:

Step 1 — Issue and submit the e-invoice immediately. Do not leave it unissued. Finalise the invoice in Xolo and transmit it to SDI as soon as possible. The longer you wait, the worse the potential penalty.

Step 2 — Gather evidence of the taxable event date. Keep documentation that confirms when payment was received or when the service was completed. This includes bank statements, payment confirmations, contracts, delivery emails, timesheets, or client sign-offs.

Step 3 — Check whether VAT or income reporting is affected. Depending on your tax regime and when the delay occurred, a late invoice may affect your VAT settlement or periodic filings. Your Xolo accountant can assess this for you.

Step 4 — Ask about ravvedimento operoso (voluntary regularisation). If a penalty applies, Italian law allows you to voluntarily regularise the infraction and pay a reduced penalty before the tax authority takes action. The reduction increases the sooner you act. Your accountant can advise on whether this applies to your situation.

Step 5 — Pay any applicable reduced penalties via the correct method. Your Xolo accountant will guide you through the appropriate payment channel (typically via F24 form) if a penalty payment is required.

Step 6 — Document the reason for the late issuance internally. Make a brief note of why the invoice was late (e.g., client dispute, illness, system issue). This is useful if you are ever asked to explain it.

Quick Recap

This article is for informational purposes only and does not constitute legal or tax advice. Italian tax regulations are subject to change. For guidance specific to your situation, please consult your Xolo accountant or a qualified tax professional.