Student self-employed calculator: all your limits in one check.

Details

• Source: https://www.studentzelfstandigecheck.be/
• Type: external calculator (free, anonymous, no login)
• Built by: Luniq, supported by Margot Vanden Bossche — this is not an official government tool
• Years covered: every income year from 2017 through 2026
• Basis: a reference document behind the calculator (last updated July 2026) citing official sources from RSVZ/INASTI, FPS Finance, VLAIO and Groeipakket
• Time needed: a series of short questions, about 3 minutes
• Language: the tool itself is in Dutch

What does it calculate?

This is more than a limit checker: it works out five things at once for your situation.

1. Status — is your student self-employed status valid, and until when?
2. Social contributions — how much you pay, per quarter and per year, in euros.
3. Tax — do you remain a dependent of your parents, and do you owe personal income tax yourself?
4. Child benefit (Groeipakket) — do you keep it, under the rules of your region?
5. Health insurance — do you stay covered as a dependent of your parents?

Why this tool?

The social insurance funds (Xerius, Acerta, Liantis, …) each offer a contribution simulator, but none of them knows the student self-employed status: you can only pick main occupation, secondary occupation or assisting spouse. If you simulate as "bijberoep" (secondary occupation) while you are a student, the result is too high. This tool applies the student scheme itself, including the reduced contribution — which makes it more accurate for students than the funds' own simulators.

The key thresholds for 2026 (as used by the tool)

• Social contribution exemption threshold: € 8,687.04 net taxable annual income — below this you pay no contributions.
• Between the thresholds: 20.5% on the part above € 8,687.04.
• Main occupation threshold: € 17,374.08 — from this income you pay contributions as a main-occupation self-employed person (at least € 890.42 per quarter) and you lose your Groeipakket, among other things.
• Maximum reduced quarterly contribution: € 445.21 — you never pay more per quarter as long as you stay below the main occupation threshold.
• Net means threshold (staying a dependent): € 12,300.
• Exempt band of student income: € 7,010 (student job and student self-employed income combined).
• Tax-free allowance: € 11,180 — below this you owe no personal income tax yourself.
• Student job quota: 650 hours — entirely separate from your self-employed activity.

One important nuance: wages from a student job do not count towards the calculation of your social contributions, but they do count towards whether you remain your parents' dependent.

Watch out: the cliff effect

The tool flags this explicitly, and rightly so: one euro above € 17,374.08 can almost double your annual contribution, because you then fall under the main-occupation scheme for the entire year. In Flanders you also lose your Groeipakket at that same threshold, possibly retroactively. If you are anywhere near it, simulate with a margin and talk to your social insurance fund.

How to use it

1. Pick the calendar year (income year) you are calculating for — it determines every amount.
2. Answer the questions about your studies, your activity and your expected income. Each concept is explained as you go.
3. Read the five results together: status, contributions, tax, Groeipakket and health insurance.
4. Run it again with a higher scenario than you expect, so you know where your limits are before you hit them.

When is this tool no longer enough?

As soon as you are no longer a student self-employed person — you graduate, you move to secondary or to main occupation — this calculator no longer applies. From then on, use:

• a social insurance fund's contribution simulator, for example Xerius (current year), Acerta (provisional and final contributions) or Liantis;
• Tax-Calc by FPS Finance for the tax side.

One pitfall when comparing figures: amounts circulate both excluding and including your fund's administrative costs (3.95% at Liantis, for instance). That is why the main-occupation minimum appears here as € 890.42/quarter while the article Graduating as a student self-employed person mentions € 925.59/quarter: the same amount, once without and once with administrative costs. Those costs differ per fund.

Important

• The tool is purely informational and strictly for personal use. Luniq and its contributors accept no liability for errors or outdated data.
• Your social insurance fund calculates and invoices your contributions; the tax authorities calculate your tax. A simulation changes nothing in your file.
• For a definitive calculation or a complex situation (starting, stopping, changing status, graduating): contact your fund or a certified accountant.

Related articles

• Income thresholds 2026 (social contributions & personal income tax)
• Graduating as a student self-employed person (academic year 2025–2026)
• Tax-Calc: get an anonymous estimate of your personal income tax (FPS Finance)
• FPS Finance calculator - Dependants

Link

• https://www.studentzelfstandigecheck.be/