B2G invoicing means billing a public authority for a product or service you have delivered. Common examples include a municipality commissioning catering for an event, or a ministry inviting you as a speaker or trainer. This article covers VAT rules, PEPPOL requirements, and how to send a compliant invoice through Accountable.
Please note that this article provides general guidance only. Tax rules may vary depending on your individual situation. When in doubt, ask your Tax Coach.
What is B2G invoicing?
B2G stands for Business-to-Government: you provide a product or service to a public authority and issue an invoice for it. Examples include:
a municipality asking you to provide catering for an event
a ministry inviting you as a speaker or trainer
Note: Not every client with a name that sounds like a government entity is actually a public authority. Always check the Belgian Business Register (KBO), to see if you should follow B2G rules or simply invoice them as a regular business (B2B).
Does the government always have a VAT number?
Almost all public authorities now have a VAT number, but that does not automatically mean you need to charge VAT. It depends on the role they are acting in for your assignment:
Government tasks (public authority role): no VAT is charged.
Commercial activities (for example, venue rental or catering): VAT is charged.
What is PEPPOL and why should you use it?
PEPPOL is a network that lets you send official e-invoices directly and securely to public authorities. In Belgium, these invoices pass through the Mercurius network, which automatically forwards them to the right department.
Sounds technical? Don’t worry: with a tool like Accountable, you simply tick “Send via PEPPOL” and your invoice will arrive at the correct destination, fully compliant with legal requirements.
When is PEPPOL mandatory?
Public contracts over €3,000: mandatory since March 2024.
All public contracts: mandatory from March 2026.
Important: This obligation only applies to public authorities. If you’re invoicing an individual (e.g., a Member of Parliament) or a non-profit, PEPPOL does not apply.
How to do this in Accountable?
1. Activate PEPPOL in your Accountable profile
Go to Settings then PEPPOL (e-invoicing).
Click Start registration to sign up for PEPPOL free of charge.
Check your details and wait until the status shows Active.
2. Create your invoice
Go to Revenue then Create an invoice in Accountable.
Choose or create your client first
Select the public authority or add a new client.
Immediately choose whether VAT applies or not (exemption for non-commercial government activities).
Then enter your invoice details.
Add the Order reference number.
You can find this field directly on the invoice itself.
3. Send via PEPPOL
After filling in your invoice, click Continue and tick Send via PEPPOL.
Without a PO number, many government accounting departments will reject your invoice.
How to invoice a Member of Parliament
If you are invoicing a Member of Parliament personally, for example a Member of the European or Flemish Parliament, the rules are different:
No VAT if they are a private person or mandate holder without a VAT number.
No PEPPOL needed, as this is only required for official public authorities.
Add this to your invoice:
"Exempt from VAT under article 44, §2, 4° of the Belgian VAT Code."
✅ Checklist: how to invoice the government correctly
Before sending your invoice:
Ask: Does this need to go through PEPPOL?
Check: Does your client have a VAT or enterprise number?
Ask: Is this assignment VAT-exempt?
Note: Does your client require a PO number or reference?
Following these steps helps you avoid delays and get paid faster.
Key takeaways
B2G invoicing applies when you bill a public authority for a product or service.
VAT is only charged when the authority acts in a commercial capacity, not for public-authority tasks.
PEPPOL is mandatory for all public contracts from March 2026.
You can activate PEPPOL and send compliant e-invoices directly in Accountable.
Invoicing a Member of Parliament personally follows different rules: no VAT and no PEPPOL required.
Need help? Chat with us or email support@accountable.eu, we're happy to help.