Belgian Capital Gains Tax 2026: Everything Investors Need to Know

Introduction: A New Era for Belgian Investors

For decades, most Belgian private investors paid no tax on their normal investment gains, though the 33% tax on speculative gains has always existed. If you managed your portfolio prudently (as a "good household father"), your profits were typically tax-free. That changes significantly with the new rules. Starting January 1, 2026, Belgium introduces a 10% capital gains tax (meerwaardebelasting) on normal investment gains, fundamentally changing how investment profits are taxed.

This is not a minor adjustment. This is the most significant change to Belgian investment taxation in over 30 years. Whether you have a small portfolio of a few thousand euros or a substantial investment account worth hundreds of thousands, this new tax will affect you. The good news is that with proper understanding and planning, you can minimize your tax burden legally and efficiently.

In this comprehensive guide, we will explain everything you need to know about the Belgian capital gains tax. We will cover who needs to pay, how much you will owe, which assets are affected, how to calculate your gains correctly using the mandatory FIFO method, and most importantly, how to use every legal strategy available to reduce your tax bill. We will also walk through real examples with actual numbers so you can see exactly how this tax works in practice.

If you use a foreign broker like Interactive Brokers, DEGIRO, or Trade Republic, pay close attention. Your broker will not automatically calculate or withhold this tax for you. The responsibility falls entirely on your shoulders, and the penalties for getting it wrong can be severe.

Want to track your capital gains automatically? Try Belgian Tax Calculator to import your broker data and see exactly how much tax you will owe under the new rules.

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Who Must Pay the Belgian Capital Gains Tax?

The new capital gains tax applies to all Belgian tax residents who sell securities at a profit. Let us break down exactly who this includes and who might be exempt.

Belgian Tax Residents

You are considered a Belgian tax resident if Belgium is your primary place of residence and the center of your economic interests. This typically means:

1. You are registered in the Belgian national register (Rijksregister)
2. You spend more than 183 days per year in Belgium
3. Your family lives in Belgium
4. Your primary income comes from Belgian sources

If you meet these criteria, you are subject to Belgian taxation on your worldwide income, including capital gains on securities regardless of where those securities are held.

What Counts as a "Security"?

The capital gains tax applies to a broad range of financial instruments:

Taxable Securities:

• Individual stocks (Belgian and foreign)
• ETFs (Exchange Traded Funds)
• Mutual funds (UCITS, SICAV, BEVEK)
• Bonds and bond funds
• Structured products
• Warrants
• Certificates
• Cryptocurrency (Bitcoin, Ethereum, and other digital assets)

Exempt Securities:

• Belgian government bonds (OLO) held to maturity
• Certain pension savings products (pensioenspaarfondsen)
• Real estate (taxed under different rules)
• Life insurance products (Tak 21, Tak 23)

The "Good Household Father" Principle

Before 2026, Belgian tax law used the concept of the "good household father" (goede huisvader / bon père de famille) to distinguish between tax-free private investments and taxable speculative trading. Under this old system, if you managed your portfolio like a prudent person, your gains were generally tax-free. Only those who traded speculatively or professionally owed taxes.

This distinction is now largely eliminated for the new capital gains tax. Starting in 2026, all capital gains above the annual exemption are taxed, regardless of whether you are a passive investor or an active trader. However, the distinction still matters for determining which tax rate applies (10% vs. 33%), as we will explain in the next section.

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Tax Rates: Understanding the 10% and 33% Rates

The Belgian capital gains tax uses two different rates: 10% for normal trades and 33% for speculative trades. The classification depends on a case-by-case assessment by the tax authorities.

The Standard 10% Rate

The normal capital gains tax rate is 10%. This rate applies to gains that are considered part of normal private asset management (good household father principle).

Example 1: Long Term Investment

Let us say you bought 100 shares of Apple stock on March 15, 2026, for €15,000 total (€150 per share). You hold these shares for 18 months and sell them on September 15, 2027, for €20,000 (€200 per share).

Because this is a long-term investment consistent with normal asset management, the favorable 10% rate applies. Your tax bill is €500.

The Speculative 33% Rate

If your trading activity is considered speculative by the tax authorities, the gain is taxed at the higher rate of 33%. Belgian tax authorities assess speculation based on multiple factors including trading frequency, holding periods, portfolio allocation, use of leverage, and overall investment behavior.

Example 2: Speculative Trade

Imagine you bought 100 shares of Apple on March 15, 2026, for €15,000 and sold them based on short-term price movements for €20,000. If the tax authorities consider this speculative:

The same €5,000 gain costs €1,650 in taxes instead of €500 at the normal rate. That is a significant difference.

Important: Whether a trade is classified as normal or speculative is determined on a case-by-case basis by Belgian tax authorities, considering factors such as your trading patterns, the nature of the investment, and your overall investment strategy.

Factors That May Indicate Speculative Trading

Belgian tax authorities consider multiple factors when assessing whether trading activity is speculative:

• High transaction frequency
• Short holding periods
• Large portfolio allocation to active trading
• Use of leverage or margin
• Use of automated trading systems
• Active profit-seeking behavior rather than passive long-term investing
• Trading based on short-term market movements

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The €10,000 Annual Exemption: Your Tax-Free Allowance

One of the most important features of the Belgian capital gains tax is the annual exemption. Every taxpayer receives a €10,000 exemption each year, meaning your first €10,000 of capital gains are completely tax-free.

How the Exemption Works

The exemption is applied to your net capital gains for the year. Net gains means your total gains minus your total losses on securities sold during the calendar year.

Example 3: Using Your Full Exemption

In 2026, you sell several investments with the following results:

Your net gains exactly equal the €10,000 exemption, so you owe zero capital gains tax.

Example 4: Gains Exceeding the Exemption

Your net gains are €18,000. Subtract the €10,000 exemption, and €8,000 is taxable. Assuming all trades are classified as normal (not speculative):

Tax owed = €8,000 × 10% = €800

Important Rules About the Exemption

1. The exemption is per person, not per account

If you have accounts at multiple brokers (for example, DEGIRO and Interactive Brokers), your exemption applies to the combined total of all your gains, not separately to each account.

2. The exemption is per year

Each calendar year (January 1 to December 31) gives you a fresh €10,000 exemption. You cannot "save" unused exemption for future years (with one important exception we will discuss next).

3. The exemption is indexed annually

The €10,000 amount is indexed to inflation. In future years, this number may increase slightly. For 2026, the exemption is confirmed at €10,000.

4. Losses reduce the exemption needed

Because the exemption applies to net gains (gains minus losses), having losses in the same year reduces the exemption you need to use. This is actually beneficial as we will explain in the tax planning section.

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The Exemption Carryforward System: Saving Unused Exemption

Here is where Belgian tax law gets interesting. While you generally cannot carry forward unused exemption, there is one important exception: the first €1,000 tranche of your exemption.

The First Tranche Rule

If your net capital gains in any year are less than €1,000, you can carry forward the unused portion of that first €1,000 to future years. This carryforward can accumulate for up to five years.

Example 5: Building Up Carryforward

After five years, you have accumulated €3,400 in carryforward exemption.

Maximum Exemption With Carryforward

The maximum possible exemption in any single year is €15,000, which consists of:

• €10,000 base annual exemption
• Up to €5,000 accumulated carryforward (maximum 5 years × €1,000 per year)

Example 6: Using Accumulated Carryforward

You have been investing passively for years with no sales. In 2031, you decide to sell a large position:

In 2031, you sell with a net gain of €14,000:

You used €4,000 of your accumulated carryforward, leaving €1,000 for future years.

FIFO Consumption of Carryforward

When you use carryforward, the oldest entries are consumed first (First In, First Out). Using the example above:

In 2031, your €4,000 consumption uses:

• The full €1,000 from 2026 (now exhausted)
• The full €1,000 from 2027 (now exhausted)
• The full €1,000 from 2028 (now exhausted)
• €1,000 from 2029 (now exhausted)
• €0 from 2030 (€1,000 remains)

Carryforward Expiration

Carryforward expires after five years. Specifically, carryforward generated in year X expires at the end of year X+5.

If you do not use your 2026 carryforward by December 31, 2031, it is lost forever.

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Cost Basis Calculation: The Critical FIFO and Weighted Average Rules

Understanding how to calculate your cost basis correctly is essential. Getting this wrong can result in overpaying taxes or, worse, underpaying and facing penalties. Belgium mandates specific methods for calculating your cost basis, and the rules differ depending on when you purchased the securities.

Post-2026 Purchases: FIFO Method

For all securities purchased on or after January 1, 2026, Belgium mandates the First In, First Out (FIFO) method for calculating cost basis.

What is FIFO?

FIFO means that when you sell shares, the tax authorities assume you are selling the oldest shares first. Think of it like a queue at a supermarket: the first person in line is the first person served.

Example 7: FIFO Calculation

You make the following purchases of VWCE ETF during 2026:

On November 1, 2026, you sell 60 shares at €120 per share (total €7,200).

Under FIFO, the 60 shares sold are:

• All 50 shares from February 1 (cost basis: €100 each)
• 10 shares from May 1 (cost basis: €110 each)

Your capital gain:

• Sale proceeds: 60 × €120 = €7,200
• Cost basis: €6,100
• Capital gain: €1,100

Pre-2026 Purchases: Weighted Average Method

For securities purchased before January 1, 2026, Belgium requires the Weighted Average Cost method. This is mandated by law for the transition period.

What is Weighted Average?

Instead of tracking each individual purchase lot, you calculate the average price paid for all shares of the same security.

Example 8: Weighted Average Calculation

Before 2026, you accumulated shares of IWDA ETF through multiple purchases:

Weighted Average Cost = €19,775 ÷ 250 shares = €79.10 per share

When you sell any shares from this pre-2026 position, each share has a cost basis of €79.10.

The Critical Step-Up Rule for Pre-2026 Positions

Here is the most important tax planning opportunity for existing investors: the step-up rule.

For positions purchased before 2026, your cost basis is the higher of:

1. Your weighted average purchase price, OR
2. The market price on December 31, 2025 (the "cutoff date")

This means that any gains accumulated before 2026 are effectively tax-free, because you get to reset your cost basis to the December 31, 2025 value.

Example 9: Step-Up Calculation

You bought 200 shares of Microsoft in 2020 at an average price of €180 per share. On December 31, 2025, Microsoft trades at €420 per share.

The step-up gives you a cost basis of €420, not €180. This means the €240 per share gain (€420 − €180 = €240) that accumulated before 2026 is completely tax-free.

If you sell in 2027 at €500 per share:

• Your cost basis is €420 (stepped up)
• Your taxable gain is only €80 per share (€500 − €420)
• Not €320 per share (€500 − €180)

This is crucial: Make sure you document the market values of all your positions on December 31, 2025. Take screenshots, download statements, and save the data. You will need this proof if the tax authorities ever question your cost basis calculations.

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Losses: How They Work (and Their Limitations)

Capital losses are an important part of tax planning. When you sell a security for less than you paid, you have a capital loss that can offset your gains.

Same-Year Loss Offset Only

Belgian law currently does not allow carrying forward capital losses to future years. Losses can only offset gains within the same calendar year.

Example 10: Loss Offset

In 2026, you have the following results:

The €5,000 loss offsets part of your €12,000 gain, leaving only €7,000 in net gains. Since this is below the €10,000 exemption, you owe zero tax.

The Wash Sale Problem

Because losses cannot be carried forward, timing matters enormously. If you have unrealized losses in December, you might consider selling to realize the loss and offset gains from earlier in the year.

Example 11: Strategic Loss Harvesting

By November 2026, you have realized €15,000 in capital gains. You also hold a position in Stock X that has an unrealized loss of €8,000.

Option A: Do nothing

• Net gains: €15,000
• Exemption: €10,000
• Taxable: €5,000
• Tax (10%): €500

Option B: Sell Stock X before December 31

• Realized gains: €15,000
• Realized loss: €8,000
• Net gains: €7,000
• Exemption: €10,000
• Taxable: €0
• Tax: €0

By selling Stock X to harvest the loss, you save €500 in taxes. You can even repurchase Stock X immediately if you still want to own it (Belgium does not have a "wash sale" rule like the United States).

Important warning: While Belgium does not have a formal wash sale rule, selling and immediately repurchasing solely for tax purposes could potentially be challenged as tax abuse if done excessively. Act prudently and keep records of your genuine investment reasoning.

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Practical Tax Planning Strategies

Now that you understand how the capital gains tax works, let us discuss practical strategies to minimize your tax burden legally.

Strategy 1: Maintain a Long-Term Investment Approach

The difference between the 10% and 33% rates is substantial. Adopting a long-term investment approach consistent with normal asset management can help ensure your trades are classified at the favorable 10% rate.

Calculation: The Difference Between Rates

For a €10,000 gain:

• If classified as speculative: 33% × €10,000 = €3,300
• If classified as normal: 10% × €10,000 = €1,000
• Difference: €2,300

For larger gains, the difference scales proportionally. A €50,000 gain would mean €11,500 more in taxes if classified as speculative.

Strategy 2: Use Your Annual Exemption Efficiently

Each year you get a €10,000 exemption. If you have positions with large unrealized gains, consider selling a portion each year to spread the gains across multiple tax years and maximize exemption usage.

Example 12: Spreading Sales Across Years

You hold IWDA ETF with an unrealized gain of €40,000. You do not need the money urgently.

Option A: Sell all in one year

• Gain: €40,000
• Exemption: €10,000
• Taxable: €30,000
• Tax (10%): €3,000

Option B: Sell €10,000 gain per year over four years

• Year 1: €10,000 gain − €10,000 exemption = €0 tax
• Year 2: €10,000 gain − €10,000 exemption = €0 tax
• Year 3: €10,000 gain − €10,000 exemption = €0 tax
• Year 4: €10,000 gain − €10,000 exemption = €0 tax
• Total tax: €0

By spreading your sales, you save €3,000 in taxes. Of course, this strategy has risks: the market might decline, or tax rules might change. But it is worth considering if circumstances allow.

Strategy 3: Tax-Loss Harvesting

As discussed earlier, realizing losses before year end can offset gains. Review your portfolio in November and December each year to identify loss-harvesting opportunities.

Strategy 4: Use Tax-Advantaged Accounts

Certain accounts in Belgium offer tax advantages:

Pension Savings (Pensioensparen)

Contributions to pension savings funds receive a tax reduction. While there are annual limits (currently around €1,020 for the 30% tax benefit or €1,310 for the 25% benefit), gains within these accounts are not subject to the capital gains tax.

Tak 21 and Tak 23 Insurance Products

Life insurance investment products have different tax treatment. While they have their own complexities and costs, they can be part of a tax-efficient strategy for some investors.

Strategy 5: Consider Your Asset Location

Where you hold certain investments can affect your overall tax efficiency:

• High-growth investments with expected large gains: Consider pension savings accounts or insurance wrappers
• Dividend-paying investments: May be more tax-efficient in taxable accounts due to the dividend exemption
• Short-term trading: If you must trade frequently, consider whether the 33% rate makes it worthwhile at all

Ready to optimize your tax strategy? Belgian Tax Calculator helps you track all your positions, calculate your cost basis correctly, and identify tax planning opportunities before year end.

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How to Report and Pay Your Capital Gains Tax

Understanding the reporting requirements is just as important as understanding the tax itself.

The Annual Tax Return

Capital gains tax is declared through your annual income tax return (Personenbelasting / Impôt des personnes physiques). The deadline for online filing via Tax-on-web is typically July 15 of the year following the tax year.

For 2026 capital gains, you will report them in your 2027 tax return filed by July 15, 2027.

What Information You Need

To correctly report your capital gains, you need:

1. Transaction records: Dates, quantities, and prices for all purchases and sales
2. Cost basis calculations: Using FIFO (post-2026) or weighted average (pre-2026)
3. December 31, 2025 valuations: For step-up calculations on pre-2026 positions
4. Currency conversion records: If you traded in USD or other currencies
5. Broker statements: To support your calculations if audited

Broker Withholding Option

Belgian brokers may offer to withhold capital gains tax on your behalf. By June 30, 2026, you can choose to opt out of this withholding if you prefer to calculate and pay the tax yourself.

For foreign broker users: Your broker will not withhold Belgian capital gains tax. You are entirely responsible for calculating and reporting the tax in your annual return.

Penalties for Non-Compliance

Getting your capital gains tax wrong can result in serious penalties:

• Late filing: Penalties increase with the delay
• Underreporting: Additional tax plus interest plus potential fines
• Fraud: Criminal penalties in severe cases

The tax authorities are increasingly sophisticated in tracking investment income. Brokers share information with tax authorities under various reporting frameworks (CRS, DAC6), so assuming you will not be caught is a risky strategy.

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Special Situations

Cryptocurrency

Cryptocurrency is subject to the capital gains tax like other securities. Each sale or exchange (including crypto-to-crypto trades) can trigger a taxable event.

Example 13: Crypto Taxation

You bought 1 Bitcoin for €30,000 in February 2026. In December 2026, you sell it for €50,000. If this is classified as speculative trading:

• Gain: €20,000
• Rate: 33% (speculative)
• Tax before exemption: €6,600
• Less €10,000 exemption (at 33% rate): €3,300 reduction
• Net tax: €3,300

If the same trade were classified as normal (part of long-term asset management), the rate would be 10%, and the tax would be only €1,000.

Inherited Securities

Securities received through inheritance have special rules. Generally, the cost basis is the value at the date of death (or alternate valuation date used for inheritance tax purposes).

Gifted Securities

Securities received as a gift may take the donor's cost basis (carryover basis) or fair market value at the time of gift, depending on circumstances. Consult a tax advisor for complex gift situations.

Moving To or From Belgium

If you move to Belgium during a tax year, you may only be subject to capital gains tax on gains realized while you were a Belgian tax resident. Similarly, if you leave Belgium, gains realized after your departure may not be subject to Belgian tax (but could be taxed in your new country of residence).

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Common Mistakes to Avoid

Mistake 1: Ignoring the Cutoff Date

Failing to document the December 31, 2025 values of your pre-2026 positions could cost you thousands in taxes. The step-up rule only benefits you if you can prove the cutoff date value.

Action item: Before December 31, 2025, take screenshots or download PDF statements showing the value of every position.

Mistake 2: Using the Wrong Cost Basis Method

Using FIFO for pre-2026 shares or weighted average for post-2026 shares is incorrect and could result in paying too much or too little tax.

Action item: Keep separate records for pre-2026 and post-2026 purchases, and apply the correct method to each.

Mistake 3: Forgetting to Track All Transactions

Every purchase and sale affects your cost basis and potential tax liability. Missing even one transaction can throw off your entire calculation.

Action item: Export your complete transaction history from your broker at least annually and store it safely.

Mistake 4: Not Harvesting Losses

Letting December 31 pass with unrealized losses while you have realized gains is leaving money on the table.

Action item: Review your portfolio in November each year to identify loss harvesting opportunities.

Mistake 5: Trading Speculatively

The 33% speculative rate is significantly higher than the 10% normal rate. Having your trades classified as speculative can cost you much more in taxes.

Action item: Maintain trading patterns consistent with long-term investing rather than short-term speculation to support normal trade classification.

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Comparison: Belgian CGT vs. Other Countries

How does Belgium's new capital gains tax compare to neighboring countries?

Belgium's new system is relatively favorable compared to most neighbors, especially for long-term investors who hold positions for more than a year. The €10,000 exemption is generous, and the 10% rate is among the lowest in Europe.

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Key Takeaways

Let us summarize the most important points about the Belgian capital gains tax:

1. Effective date: January 1, 2026

2. Tax rates: 10% for normal trades; 33% for speculative trades (classification is case-by-case)

3. Annual exemption: €10,000 per person (indexed annually)

4. Carryforward: Unused portion of first €1,000 can be carried forward up to 5 years (maximum €5,000 accumulated)

5. Cost basis methods:

   • Pre-2026 purchases: Weighted average with step-up to December 31, 2025 values
   • Post-2026 purchases: FIFO (First In, First Out)

6. Loss rules: Losses only offset gains in the same year; no carryforward

7. Key deadlines:

   • December 31, 2025: Document all position values
   • June 30, 2026: Deadline to opt out of broker withholding
   • July 15, 2027: Tax return deadline for 2026 gains

8. Planning strategies:

   • Maintain long-term investment approach to qualify for 10% rate
   • Spread large gains across multiple tax years
   • Harvest losses before year end
   • Use tax-advantaged accounts where appropriate

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How Belgian Tax Calculator Helps

Managing capital gains tax compliance can be complex, especially if you have multiple accounts, various purchase lots, and a mix of pre-2026 and post-2026 positions. Belgian Tax Calculator simplifies this entire process.

Our platform provides:

• Automatic FIFO calculations: We track every lot and apply the correct cost basis method
• Step-up tracking: We help you document and apply the December 31, 2025 step-up values
• Exemption tracking: Know exactly how much of your €10,000 exemption you have used
• Carryforward management: Track your accumulated carryforward across years
• Comprehensive reporting: Generate reports ready for your tax return

Start tracking your capital gains today and take control of your tax compliance.

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Frequently Asked Questions

1. When does the Belgian capital gains tax take effect?

The capital gains tax becomes effective on January 1, 2026. Only gains realized on or after this date are subject to the new tax. Gains accumulated before 2026 are protected by the step-up rule.

2. What is the capital gains tax rate in Belgium?

The standard rate is 10% for normal trades (part of prudent asset management). For trades classified as speculative, the rate is 33%. Classification is determined case-by-case based on factors like trading frequency, holding periods, and investment behavior.

3. How much capital gains is tax-free in Belgium?

Every Belgian taxpayer receives an annual exemption of €10,000. Only net gains exceeding this threshold are taxed. This exemption is indexed annually.

4. How do I calculate my cost basis for shares purchased before 2026?

For pre-2026 purchases, use the weighted average method. Your cost basis is the higher of your weighted average purchase price or the market value on December 31, 2025 (the step-up rule).

5. How do I calculate my cost basis for shares purchased after 2026?

For post-2026 purchases, use the FIFO (First In, First Out) method. When you sell, the oldest shares are assumed to be sold first.

6. Can I carry forward capital losses to future years?

No. Belgian law currently does not allow carrying forward capital losses. Losses can only offset gains within the same calendar year.

7. Does my foreign broker withhold Belgian capital gains tax?

No. Foreign brokers like Interactive Brokers, DEGIRO, and Trade Republic do not withhold Belgian capital gains tax. You are responsible for calculating and reporting the tax in your annual tax return.

8. Is cryptocurrency subject to the capital gains tax?

Yes. Cryptocurrency, including Bitcoin, Ethereum, and other digital assets, is subject to the same capital gains tax rules as other securities.

9. What happens if I do not report my capital gains?

Failure to report capital gains can result in penalties, interest on unpaid taxes, and in severe cases, criminal prosecution. Tax authorities receive information from brokers through international reporting frameworks.

10. How can I minimize my capital gains tax legally?

Key strategies include: maintaining a long-term investment approach consistent with normal asset management to qualify for the 10% rate; using your full €10,000 annual exemption; spreading large gains across multiple tax years; harvesting losses before year end; and using tax-advantaged accounts like pension savings.

11. Where can I learn more about other Belgian investment taxes?

For information about TOB (stock exchange tax), see our guide on TOB rates and calculations. For dividend taxation, check our article on dividend tax exemptions.

12. How does Belgian Tax Calculator help with capital gains?

Our platform automatically imports your broker data, calculates cost basis using the correct methods (FIFO or weighted average), tracks your exemption usage, identifies tax planning opportunities, and generates reports for your tax return. Start for free at belgiantaxcalculator.be.

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References

1. Belgian Federal Public Service Finance: Capital Gains Taxation https://financien.belgium.be/nl/particulieren/belastingaangifte/belastbare-inkomsten

2. Belgian Official Gazette: Law of [relevant date] on Capital Gains Tax https://www.ejustice.just.fgov.be/

3. FOD Financiën: Meerwaardebelasting 2026 https://financien.belgium.be/nl/particulieren/belastingaangifte/meerwaarden

4. Tax-on-Web Filing Portal https://taxonweb.be

5. PwC Belgium: New Belgian Capital Gains Tax Analysis https://www.pwc.be/

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Related Articles

You might also be interested in these other guides:

• TOB Rates and Caps 2026: Everything you need to know about Belgian stock exchange tax rates, caps, and how to calculate what you owe
• Belgian Dividend Exemption Freeze 2025-2030: How the dividend tax exemption freeze affects your investment returns and tax planning
• Avoiding Double Taxation for Belgian Investors: Strategies to minimize foreign withholding taxes and claim treaty benefits

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This article was last updated in February 2026. Tax laws can change. Always verify current rules with official sources or a qualified tax advisor.