Becoming a coach on the side: between calling and realism

The story almost always begins the same way. Someone in their forties with fifteen years of experience in HR, sales or management notices that the conversations giving them the most energy are not in their job description: colleagues turning up with career questions, young employees they watch grow. One coaching course later the decision is made: this will be the side business, and perhaps one day more.

The figures give that ambition context. The number of people self-employed as a secondary occupation keeps rising year after year. According to the RSVZ there were more than 352,000 at the end of 2025, with strikingly strong growth among women. And within that group, "coach, instructor or trainer" has for years been one of the most popular starter activities. That means two things at once: the barrier to entry is low, and the competition is enormous.

An unprotected title in a crowded market

Coaching is not a regulated profession in Belgium. There is no compulsory diploma, no professional body, no accreditation required to call yourself a coach. For the founder that is a blessing, since you can start tomorrow, but for the market it is a problem: the client can barely assess quality in advance. Economists call this a market with information asymmetry, and such markets have a predictable dynamic: because quality is invisible, competition shifts to visible signals such as certificates, references, specialisation and price.

From that follows the most important strategic lesson for any starting coach: "coach" is not a positioning. The question you must answer is not what you do, but for whom and with what demonstrable result. A career coach for healthcare staff looking to change direction, an executive coach for family businesses in succession, a stress coach for lorry drivers: the more specific the niche, the more credible the signal and the less you compete with tens of thousands of generalists. In Flanders there is a concrete additional channel: those recognised as a career coaching centre within VDAB's career voucher system gain access to a subsidised stream of clients, although that recognition requires a quality registration and is not feasible or desirable for every profile.

The revenue model: selling hours or selling value

The classic model, an hourly rate per session, is the simplest and the most limiting. As a side business you have at most a few evenings and Saturdays per week; anyone selling only individual sessions quickly hits a revenue ceiling of a few hundred euros a month, from which social contributions and taxes still have to come. More interesting are fixed-price trajectories (six sessions plus interim follow-up), group formats and workshops, and B2B assignments where an employer pays for coaching of staff. That last channel deserves particular attention: companies structurally pay higher rates than private individuals, and one corporate client can replace an entire private practice.

Do the maths honestly too. Of every euro of side-business revenue, a substantial share goes to social contributions (calculated on your actual secondary income) and personal income tax, which lands on top of your salary in the highest bracket of your income. The gap between "1,000 euros of revenue per month" and what remains net surprises many founders.

The bogus self-employment trap

One legal risk deserves its own paragraph. Many part-time coaches work through a single client: a coaching agency, an HR provider, sometimes even their own current or former employer. Anyone who in practice works like an employee, with fixed hours, instructions, no clients of their own and integrated into the organisation, risks reclassification as bogus self-employed, with social contributions and back payments as a result, mainly for the principal but with consequences for both parties. Belgian employment relations law assesses the actual execution, not what is on paper. A coach working mainly for one platform or agency therefore does well to build demonstrable autonomy: own clients, own rates, own materials, freedom over the diary.

Marketing without the hard sell

The coaching market has a reputation problem: alongside solid professionals, the sector attracts self-declared gurus, and clients are therefore rightly sceptical. The most effective marketing is consequently not the loudest but the most credible. Concretely: a clearly defined target group and offering, a few written-up cases with measurable results (with permission), presence where your audience already is (professional associations, internal networks, LinkedIn for B2B) and above all referrals. In a trust-based profession, one satisfied client who recommends you is worth more than a thousand ad impressions. Behaviourally that makes sense: for services with uncertain quality, people lean on social proof.

Common mistakes

The classics: starting without a niche and drowning in the crowd; treating the side business as a hobby and therefore never daring to charge professional prices; reinvesting every margin in yet another certification course rather than in winning clients; and ignoring the tax side until the first statement from the social insurance fund lands. And perhaps the biggest one: giving up the main job too early, on the basis of a few good months rather than a proven, repeatable stream of clients.

Recommendations

Treat your side business as a company from day one: register through a business counter, pick a niche, set your rates based on value and market prices rather than insecurity, and keep track of your numbers. Draw up a simple financial plan, if only to know at what monthly result the move to full-time becomes justified, and review it each quarter. Anyone wanting to do that in a structured way can use a tool such as Finny to compare scenarios: the side business as a lasting supplement versus a considered growth path to full-time self-employment.

Becoming a coach on the side is one of the most accessible forms of entrepreneurship Belgium knows, and precisely for that reason one of the hardest to excel in. Demand for guidance is real and growing, but supply is growing with it. Those who succeed rarely do so thanks to yet another certificate, and almost always thanks to three unspectacular choices: a sharp niche, a well-considered revenue model and the discipline to run a calling as a business.

Sources: RSVZ (secondary occupation statistics 2025), VDAB (career vouchers), FPS Employment (employment relations law), UNIZO (starting a side business).