Tax declaration
Our tax audit methodology
- Complete overview of the situation
- Identification of areas for optimisation
- Personalised action schedule
- Regular monitoring
Tax advisor Brussels
Tax experts for individuals and companies (SMEs) in Belgium
Belgian taxation is complex: at Finest Consult, we turn it into an advantage for your business.
Good fiscal advice means more than compliance: it means creating a competitive advantage.
Contact our tax experts in Brussels for your tax return or tax optimisation.
Fast and efficient multilingual service for professionals, companies (solopreneurs, entrepreneurs, SMEs), NGOs, ABSLs (no profit associations), start-ups, professionals and self-employed (independent workers) like consultants or freelancers, including expats living in Belgium (British, Irish, French, Italians, etc.). We can work with accounting software such as Accountable and others.
For companies
- Analysis of optimal legal structure, planning of deductions, tax timings, research of incentives
- Belgian tax returns, VAT declaration, Intervat, clients, transfer pricing, regulatory documentation, vies
For individuals / expats in Belgium
- Status and tax residence, expatriate regimes, dealing with cases of double taxation and bilateral agreements
- Tax optimisation of private assets, property management, financial investments, inheritance/donations
- Are you an expat in Brussels/Belgium? We can help you meet all your tax obligations, including Brexit aspects
International taxation: UK, Italy and other countries
- Optimum application of bilateral agreements
- Transfer of residence, support for cross-border activity
- Latest EU directives, DAC/CRS reporting, BEPS compliance
Regulatory compliance guaranteed ITAA
Institute for Tax Advisors & Accountants – Belgium
Tax management: added value
- ITAA-certified expertise, network of expert advisors
- Taylor-made business-oriented support
- Multilingual services: EN/FR/IT
ROI (Return on Investment)
- Reduce your tax burden by law
- Avoid tax penalties and disputes
- Improve your cash flow
Estimate your tax savings in Belgium now
Tax optimisation in Belgium 🇧🇪
Tax optimization encompasses all legal strategies that allow a company or an individual to reduce the amount of taxes they pay.
In Belgium, where the tax system is complex, this approach involves intelligently using the provisions established by the legislature to lighten your tax burden in a completely legitimate manner.
Unlike tax evasion—which is illegal and involves hiding income or defrauding the authorities—tax optimization strictly respects the laws in force, including those specific to the three regions (Brussels, Wallonia and Flanders).
Among the commonly used tools by taxpayers you’ll find:
- Maximizing tax deductions (professional expenses, investments, etc.);
- Making optimal use of tax credits and tax reductions;
- Choosing an appropriate business structure to benefit from advantageous tax regimes (such as the notional interest deduction, the deduction for innovation income, etc.);
- Applying for advance tax rulings to secure your tax situation.
By engaging specialist advisors in Belgian tax law like our experts, it’s possible to reconcile economic performance with legal security, while remaining compliant with local tax obligations. We serve locals and expats.
Ask our experts how to reduce your taxes in Belgium
Individuals: Documents Required to File Your Tax Return in Belgium
To correctly complete your tax return in Belgium, it is important to gather all the necessary documents in advance.
Whether you file your declaration via Tax-on-web or with the help of a qualified tax advisor, like us at Finest Consult, having all the required information helps avoid mistakes and allows you to maximize possible tax deductions.
Below is a list of the documents typically required for your tax declaration with the SPF Finances (Federal Public Service Finance).
Personal Information
Before starting your tax return, make sure you have:
- Your electronic identity card (eID)
- Or an active itsme® account to easily access Tax-on-web
- Your bank account number where the tax administration can transfer any potential refund
Documents Related to Your Income
You must gather all documents related to your taxable income in Belgium:
- Employment income (salary or self-employed income)
- Movable income (dividends, interest)
- Real estate income
- Cadastral income of your properties
- Pensions and annuities
- Alimony received
- Allowances and compensation
- Financial results for self-employed individuals, traders, and liberal professions
Professional Expenses and Deductible Charges
Some expenses may be tax deductible. Prepare the following:
- A summary of your professional expenses
- Social security contributions for self-employed individuals
- The amount of alimony paid
- A summary of your advance tax payments
Loans, Insurance and Savings
To benefit from certain tax reductions in Belgium, you may need to provide:
- The tax certificate for your mortgage loan
- The certificate for your individual life insurance linked to the mortgage
- A summary of payments made to your pension savings plan
- A summary of payments made to your long-term savings plan
- The certificate of the deductible premium for legal protection insurance
Expenses Eligible for Tax Reductions
Some expenses may entitle you to tax reductions:
- Invoices for roof insulation works
- Childcare expenses
- Payments made through service vouchers
- Payments made through local employment agencies (ALE)
Investments and Financial Income
To properly declare your financial income:
- Bank statements or certificates indicating withholding tax paid on shares
- Documents relating to investments in approved development funds
- The numbers of bank accounts held abroad
- Information regarding life insurance policies held abroad
Other Tax Certificates
- Certificates for tax-deductible donations
- Any other documents entitling you to a tax reduction
Need Help Filing Your Tax Return in Belgium?
Our multilingual tax advisor can review your documents, help optimize your tax deductions, and assist you in filing your return through Tax-on-web.
Contact us now
Belgian tax return in 2026 🇧🇪
The Belgian tax return filing season for the 2026 tax year (income earned in 2025) will begin in April 2026.
The deadlines for submitting the return vary depending on the method used (online or paper) and the type of income.
Key deadlines
Based on usual practices and current information, here are the likely deadlines to stay compliant and avoid fines:
- Paper: The deadline is generally set for the end of June 2026.
- Online (via MyMinfin/Tax-on-web): An extension is granted, often until mid-July 2026 (for example, July 15, 2026).
- Tax return with specific income: If you have specific types of income (such as self-employment income or foreign professional income), the deadline for online filing is extended, often until mid-October 2026 (for example, October 18, 2026).
Get in touch with us to get your tax return done
Salary after tax calculator: find out what’s your net salary in Belgium
Nederlands: Belastingexpert voor particulieren en bedrijven (mkb) in Brussel, België.
Belastingoptimalisatie, advies, btw-aangiften, belastingaangiften en andere diensten. Finest Consult is lid van de ITAA.