Odoo Peppol E-Invoicing: Belgium 2026 Mandate, Setup and Cost Guide

Belgium's B2B e-invoicing rule is now live, and many Odoo users switched Peppol on in a hurry. Our Odoo consulting services help finance teams check that their Odoo Peppol setup works for every customer, every journal and every vendor bill.

This guide is for owners, CFOs and accountants in Belgium and the wider EU who run Odoo or plan to. If you are new to the accounting side, start with our guide on how Odoo Accounting works.

What is Odoo Peppol and how does it work?

Odoo Peppol is Odoo's built-in connection to the Peppol network, which lets you send invoices and receive vendor bills as structured data instead of PDFs. Odoo acts as both the access point and the SMP, so no outside connector is needed.

Your access point sends a structured file to your customer's access point, which delivers it into their software as data their system can book.

Odoo's electronic invoicing documentation says Peppol registration is free and in Odoo Community. Odoo sends Peppol BIS Billing 3.0, XRechnung CIUS and NLCIUS.

Odoo lists more than 40 eligible countries, including Belgium, the Netherlands, Germany, France and the UK.

What does the Belgian e-invoicing mandate require in 2026?

The e-invoicing mandate in Belgium requires every VAT-liable Belgian business to send and receive structured e-invoices for domestic B2B transactions since 1 January 2026. Peppol BIS is the default format and Peppol the default network.

Date	Rule	What it means for you
1 March 2024	B2G e-invoicing for public contracts published after this date, generally EUR 3,000 or more	Invoices to the government go through Mercurius
1 January 2026	Structured e-invoices compulsory for domestic B2B	A PDF by email is no longer a valid invoice
January to March 2026	Tolerance period for firms that took timely steps	Over now; fines can apply
From April 2026	Fines of EUR 1,500, then EUR 3,000, then EUR 5,000	Missing the technical means is a fineable offence
2028 (planned)	Near real-time e-reporting to the tax authority	In the coalition agreement, not yet in law
2030 (planned)	Intra-EU invoicing covered	Linked to the EU ViDA package

The rule does not cover sales to private individuals. Odoo's Belgium e-invoicing page also notes the seven-year invoice storage rule, which Odoo's archive supports.

The Royal Decree of 8 July 2025 lets two parties agree another format only if it meets EN 16931. Put that in writing.

Which Odoo versions support Peppol?

Odoo's Peppol module exists from Odoo 16 to Odoo 20, but only Odoo 18, 19 and 20 are still in standard support. That matters because Peppol rules and fixes keep changing.

• Odoo 19 and 20: the current documented flow, with a participation role setting and Documents app reception.
• Odoo 18: supported until September 2027, with an older settings layout.
• Odoo 16 and 17: the module exists, but standard support has ended, so new Peppol fixes will not reach you.
• Odoo 15 and older: no built-in Peppol module; you need an upgrade or a third-party connector.

Odoo 20 adds small but useful changes. Our Odoo 20 Accounting release notes show GLN numbers on delivery contacts for Peppol, a send dialog grouped by sending method, and an easier e-invoicing onboarding.

Check your version against our Odoo version support timeline before you plan. Databases on Odoo 17 or older also pay Odoo's 25% legacy surcharge.

How do you set up Peppol in Odoo 19 and 20?

Peppol registration in Odoo takes a few minutes in Accounting settings, and activation usually completes within a day. Plan the testing time, not the click time.

1. Go to Accounting, then Configuration, then Settings, and scroll to Electronic Invoicing.
2. Click Activate Peppol and pick your identifier, such as your Belgian company number or VAT number.
3. Enter the contact email and phone with the country code, such as +32, and confirm.
4. Choose the Peppol participation role: Sending and Receiving, or Sending Only.
5. If you receive, choose the purchase journal for bills, or a Documents folder and tags.
6. Wait for activation; Odoo's scheduled action checks the status automatically.
7. Set each Peppol customer's eInvoice format and endpoint on the Accounting tab of their contact.
8. Send a confirmed invoice with the "by Peppol" option and check that its status turns to Done.

To test without real data, use Odoo's demo mode with the Odoo Demo ID endpoint, then deregister and register again in production.

If you used another access point before, deregister there first. If that provider was Hermes, the free BOSA service, Odoo says the move is handled automatically.

How do you check that a customer is on Peppol?

Before you send, verify that the customer's Peppol endpoint is valid in Odoo, because a wrong endpoint is the most common reason an invoice fails. Odoo prefills the number, but you should confirm it.

Open the customer, go to the Accounting tab, choose the eInvoice format and select the right country identifier. In developer mode, click Verify. Odoo marks the Peppol endpoint verification as Valid when it finds the contact on the network.

Use the Peppol Ready filter to see what can be sent, and set "by Peppol" as each customer's default sending method.

How does Odoo receive vendor bills through Peppol?

When you register for sending and receiving, Odoo checks for new Peppol documents several times a day and creates draft vendor bills or files them in Documents. Your team then reviews and posts them.

Bills arrive as data, so vendor, amounts and taxes fill in without typing. In Odoo 20, imported bills also reuse the account last used for the same vendor and label.

For a review step, use the Documents route, which needs the Documents app and the Documents Import from Peppol module. Self-bills can also go through Peppol.

Odoo as your Peppol access point or a third-party provider?

For most Odoo users, Odoo's own Peppol access point is the simplest choice, while a third-party provider makes sense mainly for very old versions or group-wide e-invoicing across many systems. Compare them on the points below.

Factor	Odoo built-in access point	Third-party access point
Registration cost	Free, per Odoo docs	Usually a subscription or per-document fee
Odoo versions	Module in 16 to 20	Any version, through a connector
Setup effort	Settings plus contact clean-up	Connector install, mapping and testing
Receiving bills	Draft bills or Documents, built in	Depends on the connector
Upgrades	Moves with your Odoo version	Connector must be ported each upgrade
Best fit	Odoo 18, 19 or 20 databases	Odoo 15 or older, or mixed ERP groups

Pick one route, deregister from the other, and tell customers and suppliers the date you switch.

What does Odoo Peppol cost?

Odoo Peppol costs little in licenses, because registration is free; the real cost of Odoo Peppol e-invoicing is setup, data clean-up and, for older databases, an upgrade. Budget for the work, not the connection.

Cost item	Typical figure	Source or note
Peppol registration in Odoo	Free	Odoo documentation
Odoo Standard (US, billed yearly)	US$31.10 per user a month	Odoo pricing page
Odoo Standard (India, billed yearly)	Rs 725 per user a month	Odoo pricing page
Odoo Custom (US, billed yearly)	US$61.00 per user a month, adds Studio	Odoo pricing page
Small Odoo implementation	$3k to $9k, 4 to 8 weeks	Our published ranges
Data migration from another system	$1.2k to $9k	Our published ranges

Check current list prices on the Odoo pricing page, which also shows first-year discounts and the One App Free plan. Studio, which you need to add extra Peppol fields, comes with the Custom plan.

For an existing, supported Odoo database, switching Peppol on is usually a few days of configuration and testing (illustrative, our experience). For a quick indicative budget, use our Odoo project estimate tool.

Belgium also softens the bill. For the 2024 to 2027 tax periods, small SMEs and self-employed people can deduct 120% of subscription costs for invoicing programmes. The digital investment allowance rose to 20% from 1 January 2025. Confirm both with your accountant.

Common Odoo Peppol problems and how to fix them

Most Odoo Peppol problems come from endpoints, contact data or receiving settings, not from the network itself. These come up most often, including on the Odoo forum.

• Endpoint shows invalid: users report cases where Peppol endpoint verification changed to invalid for all clients. Re-check the identifier scheme and run the participant status action.
• Suppliers cannot reach you: a thread titled suppliers can't send me invoices via Peppol is typical. Check that your role is Sending and Receiving, not Sending Only.
• Old provider still registered: deregister from the previous access point first, or documents may go to the old system.
• Missing references: some buyers need order or project references; add the extra Peppol fields with Studio.
• Custom invoice code: heavy customization of invoices can break the XML; test every invoice type before go-live.

Odoo Peppol beyond Belgium: EU and UK rollout

Belgium went first, but Peppol and e-invoicing mandates are spreading across Europe and the UK, so an Odoo Peppol setup is a long-term investment. Check each country where you invoice.

Country	E-invoicing status	Odoo note
Belgium	B2B mandatory since 1 January 2026	Odoo Peppol access point
Germany	Receiving required since 2025; sending phased in 2027 and 2028	XRechnung CIUS supported
France	Receiving for all and sending for large and mid-sized firms from 1 September 2026; SMEs send from 1 September 2027	Runs through approved platforms
Luxembourg	B2G mandatory; B2B encouraged	UBL to EN 16931 supported
Netherlands	Peppol widely used, especially B2G	NLCIUS supported
United Kingdom	B2B and B2G e-invoicing planned from April 2029, built on Peppol	UK eligible for Peppol in Odoo

UK firms can read our guide to Odoo and HMRC MTD compliance. The UAE's Peppol-based PINT AE model is covered in our Odoo UAE e-invoicing setup guide.

Which industries face the hardest Odoo Peppol work?

Industries with many B2B invoices, public sector customers or complex references face the most Peppol work in Odoo. The table shows where the effort usually goes.

Industry	Pain or cost driver	Odoo approach	How iVentureTeam helps
Wholesale and distribution	High invoice volume, many delivery addresses	Batch sending, GLN on delivery contacts	Clean contacts and test batches
Construction	Progress bills, project references	Extra Peppol fields such as project reference	Map references with Studio
Professional services	Many small clients, public tenders	Mercurius for B2G, Peppol for B2B	Set sending method per client
Manufacturing	Supplier bills with many lines	Draft bills from Peppol data	Tune bill rules and journals
Retail and eCommerce	Mostly consumers, some B2B buyers	Receive supplier e-invoices; Peppol for B2B	Split B2C and B2B flows

How iVentureTeam helps with Odoo Peppol setup

iVentureTeam sets up, tests and repairs Odoo Peppol e-invoicing so your invoices and bills flow through the Peppol network without manual fixes. We have delivered 150+ ERP projects across 35+ countries with 40+ Odoo specialists over 13+ years.

• Readiness check: version, localization, contacts, identifiers and invoice templates reviewed against the Belgian rules.
• Setup and testing: Peppol registration, demo mode tests, receiving journals and Documents folders.
• Data clean-up: customer endpoints, VAT and company numbers, and GLN codes on delivery addresses.
• Upgrades: our Odoo upgrade services move Odoo 16, 17 or older to a supported version.
• Support: fixes when invoices bounce or bills stop arriving.

Odoo Peppol case study: Fernando Tax Management

A Dutch tax practice moved from manual, duplicate entries to automated accounting on Odoo 18, the same kind of clean base that Peppol e-invoicing needs. Fernando Tax Management B.V. works across the Netherlands and Curaçao.

The firm had outgrown a rigid legacy system. Manual entry produced duplicate records, and reports had translation gaps in output that feeds government compliance.

We migrated the firm to Odoo 18 in 10 weeks, built a cost tracking workflow into Sales and Purchase, fixed hidden journal lines and translation defects, and built localized tax compliance reports.

The firm reports a 60% reduction in manual data entry. Read the Fernando Tax Odoo accounting automation case study.

The bottom line on Odoo Peppol

If you run Odoo 18, 19 or 20, Odoo Peppol is the simplest way to meet Belgium's 2026 mandate; if you run Odoo 17 or older, plan an upgrade. The connection is free, so spend your effort on data and testing.

Verify every customer endpoint, turn on receiving, test each invoice type in demo mode and watch the planned 2028 e-reporting rules.

Ready to get your Odoo Peppol setup checked?

Find out in one call whether your Odoo is ready for Peppol. Ask for an Odoo Peppol readiness review, call +91-90235-15208, or email business@iventureteam.com.