COMPARATIVE 2026 · PEPPOL MANDATORY IN BELGIUM
Best invoicing software for businesses in 2026
Invoicing software is not just for editing documents. It must fit into a larger workflow. The right choice depends on the actual role expected in your organization and the PEPPOL requirements now in effect.
WHAT A GOOD SOFTWARE MUST COVER
Emission, monitoring, status, compliance, and data exploitation.
A useful billing tool must allow for the correct issuance of invoices, track their status, manage credits, facilitate reminders, maintain a reliable history, and transmit the correct information to accounting or the management system. Ease of use remains important, but it should not overshadow the necessary robustness. Billing software is not a document production workstation. It is a link in the organization.
THE ESSENTIAL FUNCTIONS TO EVALUATE
PEPPOL compliant transmission
UBL 2.1 format, transmission via the network, compliance with Belgian regulations 2026.
Payment tracking and reminders
Visibility on unpaid invoices, automatic reminders, bank reconciliation.
Assets and credit notes
Management of corrections, refunds, and credits with complete traceability.
Accounting Login
Automatic transfer to accounting software or ERP without manual re-entry.
History and archiving
Conservation of documents in a usable format and accessible at any time.
THE BELGIAN CONTEXT CHANGES THE GAME
Structured invoicing has become an essential selection criterion.
With the obligation for B2B e-invoicing coming into effect in Belgium on January 1, 2026, invoicing software must now also be evaluated on its ability to manage structured electronic invoices and to fit into the planned exchange circuits. This goes beyond the traditional PDF logic.
A PDF can dematerialize the document but it does not meet the legal requirement. The invoice must be a structured file in UBL format, transmitted via the PEPPOL network.All the software presented in this comparison supports this requirement.This criterion is no longer sufficient to differentiate products from each other in 2026: it has become a prerequisite.
120% tax deduction on the additional cost of software subscriptions related to electronic invoicing for SMEs and freelancers, from 2024 to 2027.
THE REAL QUESTION TO ASK
Is a dedicated invoicing software neededor a more comprehensive ERP?
It all depends on the complexity level of your business. For a simple organization, a well-chosen invoicing tool may suffice. As soon as sales, inventory, accounting, purchasing, CRM, or business workflows need to be connected, it becomes more relevant to look at a more comprehensive management platform, like an ERP, to avoid re-entries and disconnections.
DEDICATED INVOICING SOFTWARE IS SUITABLE IF...
Your business is simple: you issue invoices and want to manage payments.
Your accounting is managed by an external accountant who uses their own software.
You are an independent or small business with a limited billing volume.
You want to be operational quickly, without an implementation project.
AN ERP LIKE ODOO IS ESSENTIAL IF...
You have inventory, orders, and purchases to connect to billing.
You want the invoice to be generated automatically from the validated order.
Your teams work on multiple streams that need to remain consistent with each other.
You are growing and you do not want to change your architecture in 3 years.
IMPORTANT SELECTION CRITERIA
Clarity, integration, scalabilityand consistency with your processes.
Invoicing software must remain simple to use while properly supporting growth. These six criteria allow for evaluating a tool beyond its interface.
01 | Ease of document creationCreating an invoice or quote should be quick and unambiguous. The interface should guide the user without overwhelming them with unnecessary options for their daily use. |
02 | Integration with accountingThe transfer to your accounting software or ERP must be automatic. Every manual re-entry is a source of error and a waste of time to eliminate. |
03 | Available automationsAutomatic reminders, renewals, recurring invoices, bank reconciliation. These automations reduce administrative burden without requiring manual intervention. |
04 | Compliance and PEPPOLSupport for structured electronic invoicing via PEPPOL, compliant archiving, and the ability to receive supplier invoices in the legal format. Mandatory since January 2026. |
05 | User rights and accounting accessAbility to grant access to your accountant or trustee without allowing them to modify what they shouldn't. Granular rights prevent unintentional errors. |
06 | Scalability over timeThe tool must be able to support the growth of your business without forcing you to start over. The question is not only what it does today, but what it will enable tomorrow. |
OUR SELECTION BY PROFILE
Independent, SME growingor complex structure.
STEP 01
Independent and micro-enterprise
You invoice regularly, you need to be PEPPOL compliant quickly, your accounting is managed by an external trustee. You do not have inventory to manage.
Our recommendation: Billit or Zervant
There is no best software in absolute terms. There is software that is best suited to your profile, your volume, and your flows.
STEP 03
Established company
Your accounting is central to your organization, you work closely with a trustee, and you need a robust solution for the financial and accounting aspects.
Our recommendation: Exact Online or Sage
STEP 02
Growing SME
You have sales, purchases, inventory, and you want invoicing to be the automatic result of your operational activity. You are looking to avoid re-entering data.
Our recommendation Odoo ERP
Yes, provided that the software is connected to the PEPPOL network via a certified access point. As of January 1, 2026, all Belgian companies subject to VAT must issue and receive structured invoices via PEPPOL for their domestic B2B transactions. The tools presented in this comparison all support PEPPOL. A simple PDF sent by email no longer meets this legal requirement.
Billing software focuses on issuing, tracking, and managing invoices. An ERP like Odoo integrates billing into a broader environment that also covers sales, purchases, inventory, CRM, accounting, and production. When an invoice is generated in Odoo, it is the automatic result of an order, updated inventory, and real-time accounting. For simple structures, dedicated billing software may be sufficient. As soon as the flows expand, an ERP becomes more coherent.
Yes. For the taxable periods 2024 to 2027, small SMEs and freelancers can benefit from an increased deduction of 120% on the additional cost related to electronic billing as part of a software subscription. This measure applies to subscriptions (not investments), and only on the additional cost related to electronic billing. Check the exact conditions with your accountant or fiduciary.
Billit offers a free version with limited features and a paid plan starting at €7.50 per month excluding VAT. The free version allows invoicing via PEPPOL. Advanced features are available in the paid plans. Visit billit.eu for up-to-date pricing.
Yes. Migration from invoicing software like Billit, Exact Online, or Sage to Odoo is possible. It involves transferring the customer file, invoice history, and accounting data. This type of project requires a certified Odoo partner to validate data consistency before going live. Wappli supports Belgian SMEs in this type of transition from Mouscron.
FREQUENTLY ASKED QUESTIONS
What Belgian companies ask before choosing.
Discover Odoo for invoicing.
Wappli is an Odoo Ready partner in Mouscron. We will show you how Odoo
manages invoicing, PEPPOL, and the entire business chain in one system.
