Flexi-job in Belgium 2026: the complete guide for employers

Busy terrace. Sunshine. And not enough staff. Sound familiar? For many hospitality and retail businesses, this is the moment flexi-jobbers make all the difference: flexible people you call in when you need them, without the administrative weight of a permanent contract.

But flexi-jobs don't work like ordinary employment contracts. Specific conditions apply, both to the employee and to you as the employer. And the rules have changed a lot in recent years. This article gives you a complete overview of what you, as an employer, need to know about flexi-jobs in 2026.

What exactly is a flexi-job?

A flexi-job is a special form of employment that lets employees earn extra income tax-free. The system was introduced in 2015 for the hospitality sector and has since been extended to more and more sectors.

The idea is simple: people who already work at least 4/5 for another employer can put in extra hours with you without heavy social security charges. As the employer, you pay 28% on top of the flexi-wage. No ordinary NSSO (National Social Security Office) contributions, no professional withholding tax.

For the flexi-jobber, the wage is net, up to a certain ceiling at least. And that's exactly where the first layer of complexity begins.

Who can work as a flexi-jobber?

Not everyone can simply take on a flexi-job. The conditions are strict, and the NSSO checks them automatically with every Dimona (immediate employment declaration).

The basic condition is the 4/5 rule:

In the third quarter before the employment (T-3), the flexi-jobber must have worked at least 80% for one or more other employers. So someone who wants to flexi-job with you in January 2026 must have worked at least 4/5 in Q2 2025 (April, May, June).

This is the key point. That T-3 check makes or breaks the whole arrangement.

Pensioners are an exception:

Anyone who has reached the statutory retirement age may take a flexi-job without meeting the 4/5 rule. They can earn extra without limit. Different limits apply to people who retired early: we'll come back to that later.

What is not allowed:

• Flexi-jobbing at your own employer (where you already work 4/5)
• Flexi-jobbing at a company linked to your own employer
• Flexi-jobbing during a notice period at the same employer
• Flexi-jobbing while on time credit, career break or thematic leave at that same employer

The NSSO wants to prevent employers from converting permanent contracts into flexi-jobs to save on social security charges. Understandable, but it does make the checks complex.

The 4/5 rule and the waiting period

The 4/5 rule requires at least 80% employment in quarter T-3 with another employer. This is where it gets legal. Not boringly legal, but important.

There's a catch for people who move from full-time to 4/5. Anyone who makes that choice and wants to combine it with a flexi-job faces a waiting period of two quarters.

A concrete example:

Say someone switches from full-time to 4/5 on 1 January 2026 and wants to flexi-job with you:

• January to September 2026: flexi-job allowed
• October 2026 to March 2027: flexi-job not allowed (waiting period)
• From April 2027: flexi-job allowed again

That waiting period starts in the third quarter after the switch. Confusing? Absolutely. It's one of the most common stumbling blocks. In our experience with thousands of flexi-jobbers, we see employers get caught out here regularly.

How do you check whether someone can flexi-job?

Good news: the NSSO runs the check automatically. Your Dimona FLX declaration returns an OK or a refusal. No OK? Then the person can't start as a flexi-jobber.

Even so, it's smart to check in advance. Ask your candidate flexi-jobber about their employment situation in T-3. If it's unclear, you know straight away that it's risky.

Which sectors allow flexi-jobs?

This is where 2026 becomes a turning point.

Until 1 April 2026: flexi-jobs are allowed only in specific sectors. The main ones:

• Hospitality (JC 302): where it all began
• Retail (JC 201, 202, 311, 312)
• Bakeries and pastry shops (JC 118)
• Food industry (JC 118, 220)
• Hairdressing and beauty care (JC 314)
• Sport (JC 223)
• Events and performing arts (JC 304, 329)
• Driving schools (JC 200)

From 1 April 2026: the system flips. Flexi-jobs become allowed by default in all sectors, unless the joint committee explicitly decides to step out (the so-called opt-out).

This is a fundamental change. Employers in sectors that previously couldn't offer flexi-jobs suddenly gain that option. Whether it actually happens depends on the decision within each joint committee.

The flexi-wage: what you pay and the limits

The flexi-wage is net for the employee, with no NSSO contributions and no taxes up to the ceiling, so it works differently from an ordinary wage.

Minimum wage:

In hospitality, the minimum flexi-wage has been at least 12.78 euros per hour since March 2026, including flexi holiday pay. In other sectors you follow the sector salary scales, but it's always a net amount.

Maximum wage, the 150% cap:

The flexi-wage may not exceed 150% of the basic minimum wage for the role, or of the GMMI (guaranteed average minimum monthly income). All bonuses, allowances and benefits count towards it.

In concrete terms: you can't just pay a flexi-jobber 25 euros per hour. There's a ceiling on it.

No extra-legal benefits:

Flexi-jobbers have no right to meal vouchers, eco-vouchers, an end-of-year bonus or other extra-legal benefits. The flexi-wage is what it is. Read more about end-of-year bonuses for flexi-jobbers and students.

The tax-free ceiling for 2026:

For non-retired flexi-jobbers, an annual ceiling of 18,440 euros applies (income year 2026). Up to that amount, the flexi-wage and holiday pay are completely tax-free.

Does the employee go over that amount? Then the part above the limit is taxed as ordinary remuneration at the progressive rates.

For pensioners aged 65+, there is no ceiling. They can earn extra tax-free without limit through flexi-jobs.

The 28% employer contribution

As the employer, you pay a special NSSO contribution of 28% on top of the flexi-wage. Let's not beat around the bush: flexi-jobs aren't free. But they are a good deal cheaper than regular employment.

This rate has applied since 1 January 2024: before that, it was 25%.

What does that 28% cover?

The contribution is calculated on the full flexi-wage, including holiday pay. Other ordinary employer contributions (the normal NSSO contributions) don't apply.

Deductibility:

All costs tied to a flexi-job are fully deductible business expenses: the wage, the allowances, the holiday pay and the 28% contribution.

Watch out in some sectors:

In certain sectors, contributions for the Fund for Existence Security and/or the sectoral supplementary pension are added on top. So the 28% isn't always the final figure. Check the specific rules for your joint committee.

Framework agreement vs. employment contract

Flexi-jobs involve two types of document, and this is a trap many employers stumble over. You need both a framework agreement and, per assignment, an employment contract.

Step 1: The framework agreement (mandatory)

Before your first flexi-job starts, you must conclude a written framework agreement with the employee. This is not an employment contract, but it sets the framework for future employment.

The framework agreement must contain at least:

• The way in which, and the deadline by which, you propose the flexi-job employment contract
• A brief description of the role(s) to be carried out
• The flexi-wage the employee can claim
• The text of Article 4, paragraph 1 of the law (the conditions for working as a flexi-jobber)

No framework agreement? Or missing mandatory clauses? Then the employment contract can't be treated as a flexi-job employment contract. With all the financial consequences that entails.

After more than 15 years in Belgian payroll, we know exactly how important this document is. With Recruit, you create a correct framework agreement in under 60 seconds, with all the legally required clauses filled in automatically.

Step 2: The employment contract

Per assignment, you conclude an employment contract. It can be written or verbal, and that matters for your Dimona declaration.

Exception for agency workers:

Do you work with flexi-jobbers through a temp agency? Then the framework agreement isn't mandatory. The temp agency handles the admin.

Dimona FLX: the declaration you can't miss

The Dimona declaration for flexi-jobs works differently from the one for ordinary employees: you use the "FLX" type, and the timing is crucial.

When must you file the declaration?

The Dimona FLX can be filed at the earliest one month before the start of the quarter. For a flexi-job starting on 1 April, you can only file from 1 March.

A timely and correct Dimona FLX with an "OK" response is an absolute requirement. No OK? Then the person can't start as a flexi-jobber.

Daily Dimona vs. quarterly Dimona:

This depends on your employment contract:

With a verbal agreement: daily Dimona is mandatory. You report each day of employment separately, including the start time in hours and minutes. The declaration must be registered no later than that start time.

With a written agreement: a quarterly Dimona is possible. It covers the period of the agreement, up to a maximum of one quarter. The declaration must be registered no later than the start day at 23:59.

Practical advice:

File the declaration at least 24 hours before the start. That way you have time to fix problems if the NSSO refuses the declaration.

With Recruit, this runs automatically. You schedule your staff and the system creates the correct Dimona FLX declarations. No manual hassle, no risk of late reports.

Change of end time:

If a shift stops earlier than planned, you have until midnight following the originally scheduled end time. Does it stop later? Then you have 8 hours after the original end time. Was that end time between 20:00 and 24:00? Then you have until 8 in the morning.

Common employer mistakes

In our experience with thousands of temporary workers, the same mistakes keep coming back. Here are the main ones:

Mistake 1: Late Dimona declaration

A late Dimona FLX is never accepted by the NSSO. The flexi-jobber is then treated as an ordinary employee (OTH) for that day. You pay the normal employer contributions, and the employee pays full NSSO and professional withholding tax. Everybody loses.

Mistake 2: Not checking the T-3 condition

The NSSO checks automatically, but a refusal at the last minute is disastrous for your scheduling. Check in advance whether your candidate actually worked 4/5 in T-3.

Mistake 3: Forgotten or incomplete framework agreement

No framework agreement? Incomplete clauses? The employment is treated as an ordinary employment contract. You pay normal contributions plus penalties.

Mistake 4: Flexi-jobber at a linked company

Since 2024, a flexi-jobber may not work at a company linked to the employer where they already work 4/5. The NSSO checks this and the penalties are steep.

Mistake 5: Exceeding the wage ceiling

Does the flexi-wage exceed the 150% cap? Then you pay ordinary NSSO contributions on the full wage increased by 125%. That means contributions on 225% of the flexi-wage.

Mistake 6: Not registering start and end times correctly

With a daily Dimona, you must report the exact start and end time. Incorrect registration leads to level 3 penalties.

The admin process step by step

Here is the full process to hire a flexi-jobber correctly, for anyone who wants it laid out clearly.

Step 1: Check whether your sector allows flexi-jobs

Check whether your joint committee falls under the allowed sectors. After 1 April 2026 this flips: then check whether your sector has applied the opt-out.

Step 2: Verify the candidate's conditions

Ask about the employment situation in T-3. Did the person work at least 4/5 for another employer? Is the person retired? Does the person have any tie to your company or a linked company?

Step 3: Conclude a framework agreement

This must happen before the first employment. Use a correct template with all the mandatory clauses.

Step 4: Register with the NSSO

If you aren't yet registered as an employer with the NSSO, you must register first.

Step 5: Conclude an employment contract per assignment

Verbal or written. Remember: verbal means daily Dimona, written makes a quarterly Dimona possible.

Step 6: File the Dimona FLX declaration

Do this at least 24 hours before the start. Wait for the OK confirmation from the NSSO.

Step 7: Register the hours worked

Keep track of start and end times through a time-registration system. With a daily Dimona, you also have to report this to the NSSO.

Step 8: Calculate and pay the flexi-wage

The flexi-wage including holiday pay, plus the 28% employer contribution.

What does a flexi-jobber actually cost?

Honestly? It depends on the sector and the role. But here's a worked example for hospitality.

Example 1: Minimum flexi-wage in hospitality

Say: a flexi-wage of 12.78 euros per hour (minimum for hospitality, March 2026).

• Gross = net for the employee: 12.78 euros
• Employer contribution (28%): 3.58 euros
• Total cost per hour: 16.36 euros

Example 2: Flexi-jobber in retail

In retail, the sector salary scales apply. Say the basic hourly wage is 14.50 euros.

• Flexi-wage (net for the employee): 14.50 euros
• Employer contribution (28%): 4.06 euros
• Total cost per hour: 18.56 euros

Comparison with an ordinary employee:

For that same role on an ordinary contract, you pay as the employer:

• Gross wage: 14.50 euros
• NSSO employer contribution (around 25%): 3.63 euros
• Holiday pay, end-of-year bonus, extra-legal benefits (estimated): 2.00 euros
• Total cost per hour: around 20.13 euros

The difference looks small, but add the flexibility on top. No notice period, no guaranteed salary during illness, no extra-legal obligations. For peak moments, a flexi-jobber is often the smarter choice.

But don't forget the admin. Framework agreements, daily Dimonas, hours registration, the T-3 check. That time costs money too.

Comparison with other flexible contracts

Compared with other forms of flexible employment, the flexi-job stands out mainly for its net wage for the worker and its light 28% charge for you. Here's how it stacks up against the main alternatives.

Versus student work:

Students work under a separate status with low NSSO contributions (2.71% employer contribution). They have a quota of 600 hours per year. For students who meet the 4/5 rule this status is technically possible, but usually not relevant.

Versus occasional work:

In hospitality there's also the system of "extras" (occasional workers). This is a different system with its own rules. The big difference: extras do build up social rights and have access to extra-legal benefits.

Versus temporary agency work:

Through a temp agency, you can also deploy flexible workers under this status. The advantage: the temp agency takes over the admin. The downside: you pay a margin on top of the wage cost.

Which option fits when?

The flexi status suits you if:

• You regularly have peak moments and need flexible staff
• You find candidates yourself who meet the 4/5 rule
• You can or want to manage the admin (or outsource it)
• You work in an allowed sector

Temporary agency work fits better if:

• You have no time to recruit yourself
• You want to outsource the full admin
• You need someone quickly for a longer period

Frequently asked questions

Can a student also flexi-job?

Yes, but only if the student meets the 4/5 rule in T-3. That's usually not the case. Students are better off under the student status with their 600-hour quota.

Can I employ the same person as both a flexi-jobber and an ordinary employee?

No. You can't flexi-job and work under an ordinary contract at the same employer at the same time.

What happens if my flexi-jobber exceeds the 18,440 euro ceiling?

The part above the limit is taxed as ordinary remuneration. The employee then pays tax on the amount over the limit. For you as the employer, nothing changes about the contributions.

Do I have to pay flexi holiday pay?

Yes, the flexi holiday pay is included in the flexi-wage. You don't pay it separately.

How long can a flexi-job last?

There is no maximum duration. As long as the employee meets the conditions and you handle the admin correctly, you can continue the collaboration.

Do the new April 2026 sector rules also apply to ongoing flexi-jobs?

The extension to all sectors (with an opt-out option) takes effect on 1 April 2026. Existing flexi-jobs in allowed sectors simply continue.

In short

Flexi-jobs are a powerful tool for employers who need flexible staff. You pay a 28% contribution instead of the normal NSSO charges, and for the employee the wage is net up to 18,440 euros per year.

But the admin shouldn't be underestimated. The 4/5 rule in T-3, the framework agreement, the Dimona FLX with its strict timing, the hours registration. A mistake is quickly made and the penalties are steep.

The extension to all sectors from April 2026 makes flexi-jobs more appealing for even more employers. Do check whether your joint committee uses the opt-out.

Unsure about the conditions, or want to be certain your admin is watertight? Our HR experts are happy to help.

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How Recruit helps you

Paying flexi-jobbers or students correctly is an administrative chore. Unless you outsource it.

With Recruit:

• Contracts in under 60 seconds: create trial and temp contracts without hassle
• Automatic wage calculation: correct pay according to current legislation and your joint committee
• Dimona and social documents: we handle every declaration, you focus on your business
• 24/7 personal support: always a dedicated contact who knows your company
• No fixed monthly costs: pay only for what you use

Try Recruit or get in touch with our HR experts for tailored advice.

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The information in this article is purely informative and does not replace professional legal or accounting advice. Labour legislation changes regularly. Always consult the current legislation or contact an HR expert for advice tailored to your situation.