Tradespeople in Belgium: the changes in October to integrate into your activity

Payment of subcontractors, financing of renovations, and remuneration of workers: several changes will affect construction companies in October 2026. For tradespeople, these changes involve reviewing certain administrative procedures and updating the data used to prepare construction sites.

Subcontracting: a new INASTI withholding starting October 30

Starting October 30, 2026, the relevant professionals will need to verify, before paying an invoice for construction work, whether their contractor or subcontractor has any social debts under the self-employed scheme.

When a withholding obligation applies, 15% of the invoice amount excluding VAT must be withheld and paid to INASTI. This measure complements existing mechanisms regarding ONSS and tax debts.

The warning campaign that began on October 1 allows the affected companies to regularize their situation before the implementation of the measure. The verification of the co-contractor is done on the official platform Check withholding obligation.

Wallonia: project-centered financing for renovations

Since October 1, the new Walloon support for energy renovation is based on a comprehensive approach to eligible works, rather than a line-by-line calculation.

The measure specifically targets homes classified F or G, whose renovation allows at least reaching label D, as well as homes classified E aiming for at least label C. Exceptions are provided.

For a single-family home, the financing ceiling increases from 60,000 to 75,000 euros. The Rénopack combines a zero-interest loan with a reduction in the amount to be repaid, according to the conditions of the measure.

For tradespeople, this evolution encourages preparing quotes that are consistent with the renovation process and the recommendations of the prior audit.

CP 124: update your personnel costs

New hourly minimums have been in effect since October 1 for workers under CP 124. The gross minimum reaches 18.747 euros for category I and 22.561 euros for category IV. The bicycle allowance increases from 0.30 to 0.32 euros per kilometer.

The affected companies must incorporate these changes into their payroll and cost estimates, taking into account the specific indexing modalities.

The ArtiBox reflex: update your payment procedures, your personnel data, and your quote templates to prepare upcoming construction sites with up-to-date information.