SME: practical guides and steps

An SME is more than a small business. Belgian law attaches lighter accounting and tax rules to this status. This page serves managers, self-employed people and founders who want to run their company without unpleasant surprises.

What counts as an SME under Belgian law?

The Belgian companies code mainly refers to a small company. It also defines the micro company, with even lighter rules. Three criteria matter: average headcount, turnover excluding VAT and balance sheet total. A company keeps its status as long as it exceeds no more than one threshold. However, these thresholds change with each reform. The FPS Economy therefore publishes the current official definitions.

This classification carries real weight. It sets the format of your annual accounts and your access to the reduced tax rate. It also affects several regional support schemes.

A self-employed sole trader also runs an SME in their own way. They do not file annual accounts with the NBB. However, they may keep simplified accounts while turnover stays below the legal threshold. Many small structures also choose a commercial domiciliation address to separate their home from the registered office.

Everyday obligations of an SME

A small structure still faces serious duties. Here are the main ones to track all year.

• Keep accounts suited to the legal form of the business.
• File periodic VAT returns on time.
• Declare profits under corporate or personal income tax.
• Pay the social contributions of the self-employed manager.
• File annual accounts with the NBB, for most companies.
• Send electronic invoices to other businesses since 2026.

For each point, a dedicated article explains the method. First, read about the accounting obligations of Belgian businesses. Then check how to file annual accounts with the NBB. Finally, prepare the switch to electronic invoicing.

Tax and funding: your levers

Small company status gives access to concrete benefits. For example, a reduced 20% rate applies to the first slice of profit. But this rate comes with several conditions, including a minimum salary for the manager. The tax shelter also helps you raise money from private individuals. Indeed, those investors receive a tax reduction.

To compare these schemes, read about the tax benefits available to an SME. If you need capital, also discover the tax shelter for investing in young companies.

Common mistakes and where to start

Many managers discover their obligations too late. Here are the most frequent traps.

• Mixing private spending with the business account.
• Working without general terms or a written contract.
• Neglecting GDPR compliance for customer files.
• Underestimating insurance, especially professional liability.

Where should you start? First, choose between a sole proprietorship or a company. Next, secure your business relationships with the essential commercial contracts. Then hand your figures to a professional. Our article on choosing an accountant helps you compare profiles. A well-advised SME saves time and limits its risks. Every SME benefits from that support, whatever its sector.