Gross to net in Belgium: how salary calculation works

You have just received your first payslip. Or maybe a job offer landed with a gross salary of 3,000 euros a month. Sounds good. But how much of that do you actually keep? That is the question almost every employee in Belgium ends up asking. And the honest answer is not as simple as you would like.

In Belgium, the gap between gross and net salary can climb to 40% or more. Where does that money go? Why is the calculation so complex? And how can you estimate what really lands in your account?

This article walks you through the full salary calculation. Step by step. From gross to net. With concrete examples and the current percentages for 2026. No useless jargon, just the information you need to understand your payslip.

Gross salary versus net salary

Gross salary is the full amount your employer pays for your work; net salary is what reaches your bank account after deductions. The distinction is fundamental, but it often causes confusion, so let's start at the beginning.

Gross salary is the total amount your employer pays for your labour. It is the figure written into your employment contract. It is also the amount used to calculate your social rights, such as your pension and unemployment benefits.

Net salary is what remains once the NSSO (National Social Security Office) contributions and the professional withholding tax have been deducted. This is the amount paid into your bank account.

Say you earn 3,000 euros gross a month. After all deductions, you keep roughly 1,950 to 2,100 euros net, depending on your personal situation. That difference of around 900 to 1,050 euros goes to social security and taxes.

Here is where it gets a little technical. Not boring-technical, but worth understanding so you know exactly what happens to your salary.

Belgian salary calculation, step by step

In Belgium, the calculation from gross to net follows a fixed sequence, with each step building on the previous one.

Step 1: Start with the gross monthly salary

This is your starting point: the gross salary agreed in your contract, plus any bonuses, overtime or other allowances that count as salary.

Step 2: Deduct the employee NSSO contribution

The employee pays 13.07% of the gross salary to the NSSO. This percentage has been stable for years and still applies in 2026.

For a gross salary of 3,000 euros: 3,000 x 13.07% = 391.10 euros

Note for blue-collar workers: For blue-collar workers, the NSSO contribution is calculated on the gross salary increased by 8%. That is because their holiday pay is paid by the holiday fund rather than by the employer directly.

Step 3: Calculate the taxable salary

After the NSSO contribution is deducted, you get the taxable salary. This is the amount on which the withholding tax is calculated.

3,000 - 391.10 = 2,608.90 euros taxable salary

Step 4: Deduct the withholding tax

The withholding tax is an advance on your annual income tax. The exact amount depends on:

• Your income (progressive tax brackets)
• Your family situation (single, married, cohabiting)
• Your partner's income (if applicable)
• The number of dependent children
• Other dependants

Since 2023, the tax authorities have used sliding scales instead of fixed tables. The withholding tax is calculated using a key formula you can find on the website of the FPS Finance.

Step 5: Apply any reductions

Certain employees are entitled to reductions:

• The work bonus for low salaries
• A reduction for group insurance contributions
• Tax exemptions for overtime

Step 6: The net salary

What remains after all deductions is your net salary. This is the amount paid into your account.

The 13.07% employee NSSO contribution

The employee NSSO contribution of 13.07% is the first amount taken off your gross salary. This money finances Belgian social security: pensions, health insurance, unemployment benefits, child benefit and more.

In our experience with thousands of employees, this percentage is often confused with the employer contribution. The key difference: as an employee, you pay 13.07%. On top of that, your employer pays roughly another 25% (in the private sector). Together, these make up the total NSSO contribution.

Concrete example:

Gross salary	Employee NSSO (13.07%)	Taxable salary
2,500 euros	326.75 euros	2,173.25 euros
3,000 euros	391.10 euros	2,608.90 euros
3,500 euros	457.45 euros	3,042.55 euros
4,000 euros	522.80 euros	3,477.20 euros

Want to know more about the total social security contributions, including what your employer pays? Read our article on calculating NSSO contributions.

Withholding tax: how it shapes your net pay

The withholding tax is usually the biggest chunk taken off your salary, and at the same time the most confusing part of the calculation. This is the key point.

The withholding tax is not a separate tax. It is an advance on the personal income tax you have to pay anyway. Your employer withholds this amount each month and forwards it to the tax authorities. At the end of the year, when you file your tax return, it is calculated whether you paid too much or too little.

Progressive tax brackets

Belgium uses a progressive tax system: the more you earn, the higher the percentage you pay on the extra income. The brackets for 2026 (on an annual basis) are:

Taxable bracket	Rate
0 - 15,820 euros	25%
15,820 - 27,920 euros	40%
27,920 - 48,320 euros	45%
More than 48,320 euros	50%

Important: these rates apply to your taxable income, not to your gross salary. And you do not pay 50% on everything, only on the portion above 48,320 euros.

The tax-free allowance

Everyone is entitled to a tax-free allowance: a portion of your income on which you pay no tax. For 2026, this basic allowance amounts to roughly 10,570 euros a year (indexed figure). This amount is increased by:

• An extra exemption for dependent children
• An extra exemption for other dependants
• Supplements for specific situations (single parent, etc.)

How your family situation affects it

Your personal situation has a significant impact on your withholding tax. A single person without children pays more than a married employee with two children on the same gross salary.

A practical example at 3,500 euros gross a month:

• Single, no children: roughly 700-750 euros withholding tax
• Married, partner without income, 2 children: roughly 350-400 euros withholding tax

The difference? More than 300 euros net a month. That is why it matters so much that your employer has your family situation recorded correctly.

The work bonus: extra net for lower wages

Employees on a lower gross salary get a boost through the work bonus. This system has two parts.

Social work bonus

The social work bonus is a reduction of the NSSO contribution, so you pay less than the standard 13.07%. It applies to employees with a reference salary up to a certain ceiling (in 2026 around 2,900 euros gross a month, depending on indexation).

The lower your salary, the higher the reduction. At the minimum wage, the social work bonus can climb to more than 200 euros a month.

Fiscal work bonus

On top of the social work bonus, you also get a tax reduction. The withholding tax is lowered further. For the lowest incomes, this amounts to 52.54% of the social work bonus. For other low and middle incomes, it is 33.14%.

From 2026, both components are being strengthened further, in line with the measures the federal government announced at the end of 2025. The goal: to make working financially more attractive than not working.

You can read more about the work bonus and other measures for low salaries at Liantis.

What else affects your net salary

Beyond NSSO and withholding tax, several other elements determine what you keep net.

Dependent children

Each dependent child raises your tax-free allowance, which lowers your withholding tax. The tax benefit per child can add up to several hundred euros a year.

Family situation

Married or legally cohabiting? If your partner has little or no income, you can benefit from the marital quotient. Here, part of your income is fiscally 'transferred' to your partner, which often results in a lower overall tax rate.

Commuting

Some commuting allowances are (partly) exempt from tax. For example:

• Bicycle allowance (exempt up to 0.35 euros per kilometre in 2026)
• Public transport reimbursement (usually fully exempt)
• Mileage allowance for your own car (flat-rate exemption)

Other dependants

Not only children, but other people can be fiscally dependent too: parents, grandparents, brothers or sisters under certain conditions.

Fringe benefits: what counts

Many employers offer fringe benefits. Some of these increase your taxable income, others do not.

Benefits in kind (taxable)

A benefit in kind is a benefit your employer gives you in kind rather than in cash. The tax authorities calculate a flat-rate value for it, which is added to your taxable income.

Company car: For 2026, the benefit is calculated based on the catalogue value and the CO2 emissions. The minimum benefit in kind amounts to 1,690 euros a year. The reference emission is 58 g/km for diesel cars and 70 g/km for petrol/LPG/natural gas.

Smartphone/laptop: Set at a flat annual amount.

Housing provided: Calculated based on the cadastral income.

Benefits exempt from tax

Some benefits are fully or largely exempt:

Meal vouchers: From 2026, the maximum value may rise from 8 to 10 euros per day worked. The employer contribution (max. 8.91 euros) is exempt from both NSSO and taxes, provided certain conditions are met.

Eco-vouchers: Up to 250 euros a year, fully exempt.

Sport and culture vouchers: Up to 100 euros a year, exempt.

Group insurance: Employer contributions are not taxable for the employee. Your personal contributions give you a tax reduction.

Worked example: 3,200 euros gross to net

For a white-collar employee earning 3,200 euros gross, the net comes to about 2,117 euros. Let's run the concrete calculation for someone with this profile:

• White-collar employee in the private sector
• Gross monthly salary: 3,200 euros
• Single
• No dependent children
• No fringe benefits (except meal vouchers)

Step 1: NSSO contribution 3,200 x 13.07% = 418.24 euros

Step 2: Taxable salary 3,200 - 418.24 = 2,781.76 euros

Step 3: Withholding tax For a single person without children on this taxable salary, the monthly withholding tax comes to roughly 650-680 euros (indicative, 2026 calculation).

Step 4: Net salary 2,781.76 - 665 = 2,116.76 euros (rounded)

This is a simplified calculation. The exact withholding tax depends on the applicable scales and your specific situation.

What if the same employee were married with a partner without income and two children?

The NSSO contribution stays the same (418.24 euros), but the withholding tax drops sharply, possibly to around 300 euros. The net salary then rises to about 2,480 euros. That is a good 360 euros more a month, purely because of the different family situation.

Want to run the numbers yourself? Liantis and SD Worx offer free gross-to-net calculators.

Keeping track of these calculations by hand for several employees quickly gets complex. Recruit automatically calculates the correct net salary for every employee, taking into account the Joint Committee, the family situation and all current rates.

13th month and holiday pay: different rules

Not every salary component is taxed the same way. The end-of-year bonus (13th month) and holiday pay follow specific rules.

End-of-year bonus

The 13th month, or end-of-year bonus, is an extra gross monthly salary that many employees receive in December. The amount and conditions are set by the Joint Committee or the individual employment contract.

The same NSSO contributions (13.07%) are withheld on the end-of-year bonus. The withholding tax, however, can be higher because this amount is treated as a special reward.

Holiday pay for white-collar workers

White-collar workers usually receive their holiday pay in May or June. The single holiday pay (continued pay during leave) is taxed normally. The double holiday pay (a holiday supplement of 92% of the gross monthly salary) is subject to specific deductions:

• NSSO: 13.07% on 85% of the double holiday pay
• Withholding tax: separate rate

Holiday pay for blue-collar workers

For blue-collar workers, this works differently. Their holiday pay is paid out by the holiday fund (the National Annual Holidays Office, RJV/ONVA, or a sectoral fund), not by the employer. This explains why the NSSO contribution for blue-collar workers is calculated on gross + 8%.

Common mistakes and misconceptions

After more than 15 years in Belgian payroll, we keep seeing the same misconceptions come back.

Mistake 1: Comparing gross without context

"I earn 3,000 euros gross, and so does my colleague, but she keeps more net."

That can be true. If your colleague has two children or a partner without income, she pays less withholding tax. On the same gross salary, the net difference can run to hundreds of euros a month.

Mistake 2: Thinking a raise goes entirely to the taxman

"A 200-euro gross raise won't get me anything."

Not true. You do pay more tax on that extra 200 euros (up to 50% in the highest bracket), but you always keep something. Even in the worst case, you keep at least 50 euros net extra. Usually it is more.

Mistake 3: Ignoring fringe benefits

A gross salary of 2,800 euros with meal vouchers, group insurance and hospitalisation insurance can be more advantageous net than 3,000 euros gross without benefits. Fringe benefits are often more tax-friendly than ordinary salary.

Mistake 4: Passing on the wrong family situation

If your family situation changes (marriage, birth, divorce) and you do not report it to your employer, you may pay too much or too little withholding tax. Too much? You get it back with your tax return, but in the meantime you have had less net. Too little? Then you have to pay the difference.

Mistake 5: Forgetting holiday pay and the 13th month

When comparing salary packages, people sometimes forget that holiday pay and the 13th month are also salary. A monthly salary of 3,000 euros with a 13th month and double holiday pay is worth more than 3,200 euros a month without those extras over a full year.

Frequently asked questions

How much comes off from gross to net in Belgium?

On average, an employee keeps between 55% and 65% of the gross salary as net. The exact percentage depends on how high your salary is and your personal situation. For higher salaries and for single people without children, this can drop to 50% or less.

How do I calculate my net salary if I know my gross?

First deduct 13.07% NSSO from your gross. On the remaining amount (taxable salary), the withholding tax is calculated according to your family situation and income. The result is your net. For a quick estimate, you can use the online calculators from Liantis, SD Worx or Acerta.

Why does my net salary differ each month?

Variations can arise from: a changing number of days worked (with an hourly wage), bonuses or commissions, meal vouchers (variable number of working days), or corrections from previous months. A change in your personal situation can have an effect too.

Do I pay NSSO on my holiday pay?

Yes, but the calculation is specific. On the double holiday pay for white-collar workers, 13.07% NSSO is calculated on 85% of the amount. For blue-collar workers, the employer pays an increased NSSO contribution all year round (gross + 8%), which is how the holiday pay is financed through the holiday fund.

What is the difference between withholding tax and personal income tax?

Withholding tax is the advance withheld from your salary each month. Personal income tax is the final tax you owe each year. After your tax return, it is calculated whether the withheld withholding tax was enough. Paid too much? You get a refund. Too little? You pay the difference.

In short

Going from gross to net in Belgium involves two big deductions: the NSSO contribution (13.07%) and the withholding tax (variable). Your family situation, dependent children and fringe benefits determine how much you ultimately keep.

The main points at a glance:

• Employee NSSO contribution: 13.07% of the gross salary
• Withholding tax: depends on income and personal situation
• Work bonus: extra net for low salaries
• Fringe benefits can be more tax-friendly than ordinary salary
• Holiday pay and the 13th month have specific calculation rules

This is not simple material. Even experienced employers sometimes struggle with the complexity of Belgian salary calculation. And that is exactly why most of them outsource it to a social secretariat or payroll partner.

---

How Recruit helps you

No desire to puzzle over NSSO percentages and holiday pay yourself? We get it.

With Recruit:

• Contracts in under 60 seconds - Create trial and temporary contracts without hassle
• Automatic salary calculation - Correct pay in line with current legislation and your Joint Committee
• Dimona and social documents - We handle all the declarations, 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.

---

The information in this article is purely informative and does not replace professional legal or accounting advice. Labour legislation changes regularly. The amounts and percentages mentioned are indicative for 2026 and may be indexed or amended. Always consult the current legislation or contact an HR expert for advice tailored to your situation.