The principle: liberalization since 2015

Since January 1, 2015, a major change: retirees who have reached legal retirement age (65) or have a 45-year career may combine their pension with professional activity without any income ceiling.

Translation: no pension reduction, no ceiling to respect, no prior authorization. You invoice as a regular self-employed worker, your pension keeps coming in.

💡 Practical consequence: many Belgian self-employed continue to work after 65 (part-time, occasional missions, consulting) while receiving full pension. This became advantageous fiscally and socially in many cases.

The 2 main situations

Case 1 — Legal retirement age OR 45-year career

Unlimited combination. You can exercise self-employed (or salaried) activity without any income limit. No prior declaration needed for ceiling compliance.

Case 2 — Early retirement before 65, without 45-year career

Capped combination. If you receive an early pension (e.g., at 63), you cannot freely exercise activity. Annual ceilings apply depending on activity type and family situation.

Situation
Approximate annual ceiling (2025)
Early retired, no dependent child, self-employed
~ €9,230
Early retired, with dependent child, self-employed
~ €13,845
Legal retirement (65 or 45-year career)
No ceiling
⚠️ Ceiling exceeded with early retirement: if you exceed the annual authorized ceiling under early retirement, your pension is proportionally reduced. Above 25% over, the pension is fully suspended for the year.

Social contributions: a separate status

A retired self-employed continues to pay social contributions, but at a reduced rate.

Classic main self-employed contributions20.5%
Retired self-employed contributions~14.7%

Important note: these contributions no longer generate additional pension rights (since the pension is already paid). It's a "solidarity contribution". But they remain deductible from IPP.

Taxation: the marginal rate trap

The classic mistake of the new retired self-employed: not anticipating the impact of new income on their tax bracket.

If your pension already places you in the 45% bracket (annual taxable income above ~€26,800), each additional self-employed euro is taxed at the highest marginal rate. Combined with social contributions and expenses, the effective net of self-employed activity may be much lower than expected.

💡 Useful calculation: simulate your IPP with and without additional activity before launching. If your marginal rate climbs to 50%, that means about 60-65% of your gross self-employed income disappears in charges and taxes.

Optimizing the combination

✅
Maximize deductible professional expenses Office, equipment, travel, training, professional subscriptions: anything related to activity reduces your taxable income. Keep your invoices.
✅
Choose the right status Sole proprietor for small volumes, company for large volumes where tax optimization matters. For a retiree starting small activity, sole proprietor remains almost always preferable.
✅
Continue PLCI if not yet liquidated If you haven't yet recovered your PLCI capital, you can continue contributing as long as you remain active self-employed (in principle until 65).
✅
Anticipate impact on withholding tax If you generate large income, your higher tax bracket can also affect net return on investments (interest, dividends).

Formalities

  1. If you were already self-employed: inform your social insurance fund of pension start. Status switches automatically to "retired self-employed" with new rates.
  2. If you start after retirement: follow same formalities as beginning self-employed (BCE, social fund, VAT if needed).
  3. Early retirement: declare your activity to your pension institution (FPD, INASTI). Otherwise, undetected overrun = retroactive recovery of overpaid amounts.

In summary

For a retiree at legal age, combination is fully free and treats fiscally as normal self-employed activity. For an early retiree, the system is stricter: ceilings to strictly respect.

In all cases, calculate net after taxes and contributions before launching. An activity that seems profitable in gross may turn out marginal in net once stacked on pension.

⚖️ Disclaimer. Ceilings, contribution rates, and tax rules vary depending on your exact situation. This article provides a general framework. Consult your pension institution (FPD or INASTI) and an accountant for your specific case.

Official sources

Federal Pensions Service
INASTI — Pension and activity combination
FPS Finance — Retiree taxation