How much can I earn tax-free on the side in Belgium?
Surprisingly much — if you pick the right route. The queen is the flexi-job: anyone with a 4/5 main job (three quarters earlier) or a pension earns in hospitality, retail, care and dozens of sectors tax-free up to ±€18,440 a year (2026) — note: early pensioners under 66 with fewer than 45 career years cap at ±€8,120. Alongside sits association work (article 17) for sport and socio-cultural sectors: up to ±€7,460 (2026) exempt. Smaller routes: occasional citizen services and the sharing economy via approved platforms (own caps, a 10.7 % levy) — and selling your own second-hand stuff stays untaxed. Outside those frames it's simply taxable — or undeclared work.
📋 The rules
- Flexi-job: up to ±€18,440/yr (2026) tax-free — 4/5 job or pension required
- Early pensioners (<66, <45 career years): cap ±€8,120
- Article-17 association work (sport/culture): ±€7,460 exempt
- Sharing economy via approved platforms: own cap, 10.7 % levy
- Selling your own used items: tax-free (no trading)
🔓 Exceptions
- Students: a separate statute (650 hours) — see student jobs
- Systematic sales/services outside the frames: declare as (secondary) income
- Early pensioners under 66 with fewer than 45 career years: not ±18,440 euros but a flexi cap of ±8,120 euros
⚠️ Penalties & fines
Earning outside the frames without declaring it is no small thing: it counts as tax fraud or undeclared work, with back taxes, fines and a social-security regularisation on top. If the flexi conditions are not met — you did not work 4/5 in the reference quarter — the pay is requalified: flexi pay becomes ordinary wages, the avoided contributions are clawed back, and the amount you thought you were keeping net gets taxed after all. Anyone systematically buying to resell counts as a trader, and platforms have been reporting that turnover straight to the tax office since DAC7.
📎 Official sources
- Federal Finance Service · Flexi-jobs (NL/FR) →
- Accent · Flexi-jobs 2026 explained (NL) →
- Cultuurloket · Side income via flexi-jobs (NL) →
❓ Frequently asked
Who qualifies for a flexi-job?
Anyone who worked at least 4/5 for another employer three quarters earlier, plus pensioners. Students and people working less than 4/5 part-time are excluded — for them it is simply taxable pay.
Is flexi pay really net?
Yes: up to the yearly cap of ±18,440 euros (2026) there is no withholding tax and no personal social-security contribution. Anything you earn above that cap is taxed as ordinary professional income.
What is article-17 association work?
A separate statute for the sport and socio-cultural sectors, with up to ±7,460 euros a year exempt. Hour and sector limits do apply, so it is not a licence to work unlimited hours.
Can I sell on Vinted tax-free?
Selling your own used items is untaxed, because it is not trading. Systematically buying in order to resell is trading — and platforms have reported your turnover to the tax office since DAC7.
Does the 18,440-euro cap also apply if I took early retirement?
Not always: if you are under 66 and have fewer than 45 career years, your flexi cap drops to ±8,120 euros. Reach the normal pension age or 45 career years and you get the full amount.
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