Mandatory e-invoicing in 2026 in Belgium: Three-month tolerance period announced
Mandatory e-invoicing in 2026 in Belgium: Three-month tolerance period announced
As Belgium prepares for the mandatory introduction of B2B e-invoicing as of the 1st of January 2026, businesses are entering a decisive phase in their digital transformation journey. The new regime will significantly change how invoices are created, transmitted and processed. With the draft law now published and a conditional tolerance period announced for the first quarter of 2026, companies have received additional clarity and a clear responsibility – playtime is over, your e-invoicing transition should already have started.
BDO outlines what the new rules mean in practice and how organizations can navigate the transition with confidence.
BDO outlines what the new rules mean in practice and how organizations can navigate the transition with confidence.
Mandatory structured e-invoicing for domestic B2B transactions
From January 2026, invoices exchanged between Belgian VAT-registered businesses must be issued in a structured electronic format compliant with EN 16931, transmitted via the Peppol network. Transactions that fall under the exemptions of Article 44 of the Belgian VAT code remain out of scope. The obligation applies only to domestic B2B transactions, meaning cross-border invoicing flows are unaffected.
Three-month tolerance period: January–March 2026
The VAT administration will apply a three-month tolerance period from January to March 2026, during which no penalties will be imposed for non-compliance directly linked to the new obligation — provided businesses can demonstrate timely and reasonable preparation. This is not a general postponement: the 1 January start date remains firm, and cases will be assessed individually. Companies that cannot show adequate preparation may still face sanctions, even within the tolerance window.
Fallback solution when customers are not technically able to receive e-invoices
The draft law introduces an important fallback mechanism for situations where a customer is not technically able to receive structured electronic invoices. Although both parties are required to be able to issue and receive such invoices, the legislator recognizes that suppliers may still be confronted with customers who are not technically ready. In order to avoid penalizing suppliers who have taken all reasonable steps to comply, the draft law confirms that, in these specific cases, the supplier may temporarily issue a traditional invoice — either on paper or in a non-structured electronic format such as PDF. This exception is strictly limited to genuine technical incapacity on the customer’s side and does not relieve customers from their obligation to become able to receive structured e-invoices.
What organizations must do now
Organizations should now ensure their ERP and accounting systems can issue and receive structured e-invoices, adapt internal workflows, train staff and align with key partners. Preparing thorough documentation of all implementation steps will be essential.
BDO's support throughtout the transition
BDO continues to support clients through each stage of this transition, from readiness assessments to implementation and optimization, ensuring full preparedness for the 2026 go-live.Our experts are of course happy to support in case of questions or remarks. Check our website (E-invoicing: a legal requirement that impacts your entire organisation - BDO) or our designated e-mail address e-invoicing@bdo.be