Construction invoice approval workflow for Belgian contractors

Supplier invoices in construction need both administrative and site knowledge. Accounts can check totals and VAT details, while the site team knows whether materials arrived and work was accepted. A clear approval workflow combines those checks before an invoice is posted or released for payment.

Capture the original once

Use one controlled inbox for structured e-invoices and other supplier documents. Record the supplier, invoice number, date and receipt channel. Keep the original file or structured record available for review. Scattered copies in personal email and chat make duplicates harder to detect.

Belgian B2B structured e-invoicing rules have applied since 2026 to transactions that fall within their scope. The Belgian authorities maintain an official B2B e-invoicing FAQ and Peppol FAQ. Use current official guidance and professional advice for a company’s specific tax position.

Run the administrative checks

Verify supplier identity, invoice number, dates, currency, totals, VAT treatment and payment details. Check whether the document appears to duplicate an earlier invoice or replaces one through a credit note. A bank-account change deserves a separate verification through a trusted contact route.

Technical delivery through Peppol does not prove that the underlying goods or services were accepted. It solves document exchange, not site approval.

Run the project check

Assign the invoice to the correct project, purchase order and cost code. The project approver compares quantities, rates and delivery with the order, delivery note, subcontract or site record. Differences should be explained rather than waved through because the due date is close.

For invoices covering multiple projects, allocate lines using documented evidence. If the split is uncertain, hold the item in an exception queue and give someone responsibility for resolving it.

Set proportionate approval levels

Routine, low-risk costs may need one operational approver after the administrative check. Large amounts, contract deviations or unusual suppliers may need a second approval. Define thresholds that fit the business and name substitutes for absence.

Separate approval of the cost from release of payment where appropriate. The first confirms that the invoice is valid; the second confirms timing and cash availability. Small firms may combine roles, but should still preserve the two questions.

Record exceptions and decisions

Use explicit outcomes such as approved, clarification required, disputed or rejected. Record who decided, when and why. Notify the supplier promptly when a genuine dispute affects payment, and keep the correspondence with the invoice.

Review bottlenecks monthly. Repeated missing project references may be solved by improving purchase orders and supplier instructions, not by adding another approval layer. Explore Enfin through pricing or contact to discuss your invoice workflow.