Belgium: Formats and rules

When does the obligation apply?

Country information
Scope	From	Status
Public clients	Jan 2020	in forceFederal authorities about Peppol
Companies (B2B)	1 Jan 2026	in forceTransition period until March 31, 2026, self-billing until June 30, 2026

Mandatory via Peppol for federal authorities since 2020 (BOSA).

Structured e-invoicing between companies mandatory from January 1, 2026; Transition period until the end of March 2026.

Formats	Peppol BIS Billing 3.0 (UBL) · UBL 2.1 according to EN 16931
CIUS	Peppol BIS Billing 3.0
Routing identifier	Peppol ID, Belgian company number (schemeID 0208)
Responsible body	BOSA/FPS Finance

✓ EN 16931 (BR-*)
✓ Peppol BIS Billing 3.0
Implemented regulations: Peppol BIS Billing 3.0 (UBL), Peppol BIS Billing 3.0 (CII)

Belgian BEvCIUS additional rules are not yet included; EN 16931 and Peppol rules are fully operational.

Status: 12.10.2026

When does the e-invoicing requirement apply in Belgium?: The table above gives the dates for Belgium: when receiving and when issuing become mandatory, for public bodies and for companies separately.
Does the requirement apply to small businesses too?: Usually yes. The obligation follows from trading between businesses, not from the size of the business. Smaller companies are often covered later, where a transition period applies — the dates above show where Belgium stands.
Which formats are allowed in Belgium?: The formats that satisfy EN 16931. Which ones apply in Belgium, and which CIUS, is listed under formats and rules.
Can I check my invoice for Belgium for free?: Yes. The validator checks free of charge and without sign-up against the rule sets that apply to Belgium.

Free, without registration. The set of rules is selected from the specification identifier of the invoice.

Official rule sets up to date: EN 16931 1.3.17 · Peppol BIS 3.0.20 · XRechnung 3.0.2 (KoSIT 2.6.0). Last checked against the sources on 12.10.2026.