Property Capital Gains Tax in Belgium in 2026: Who Pays When You Sell, and When?

You are selling a flat in Ixelles, a house in Uccle or a plot you inherited in Watermael-Boitsfort, and one question always comes up: does property capital gains tax in Belgium apply to you? Good news for most sellers: in most cases, no.

There are, however, specific exceptions. They depend on three things: how the property is used, what kind of property it is (a building or land) and how long you have owned it. Here are the rules in force in 2026, with a step-by-step calculation.

Your main home: the general rule

If you sell the house or flat you live in, the gain is in principle not taxed, whenever you bought it.

The condition: the property must have been your own home for an uninterrupted period of at least 12 months before the sale, according to Forum for the Future (in French). Notaire.be also lists the family home among the exceptions.

There is one trap. If the building is worth less than 30% of the total sale price, the tax authorities apply the rules for land and the exemption no longer applies. The Constitutional Court upheld this rule in its judgment no. 95/2026 of 10 September 2026. It mainly affects small older houses on large plots.

Second homes and investment properties: the 5-year rule

For a building that is not your main home (a rented flat, a second home, an investment studio), second home capital gains tax only applies if you sell within 5 years.

• Sale less than 5 years after purchase: the gain is taxed at 16.5%, plus the municipal surcharge.
• Sale after 5 years: no tax, as long as the sale remains normal management of your private assets.

The dates that count are those of the notarial deeds, not the preliminary agreement. Selling within 5 years is not always costly, but the date of the deed can make the difference. If your property is let, also read our guide to selling a rented property in Brussels.

Land: an 8-year period

Capital gains on land follow stricter rules, as set out by notaire.be and RSM:

Time since purchase	Tax rate on the gain
Less than 5 years	33%
Between 5 and 8 years	16.5%
More than 8 years	Not taxable

These rules also apply to a building worth less than 30% of the total price (see above).

Inheritance, gifts and companies: special cases

Inheritance. Property you inherit is not covered by these rules. Selling it quickly after the death does not by itself trigger the tax. For the practical side between heirs, see our article on selling an inherited or jointly owned property in Brussels.

Gifts. A building received as a gift remains taxable if two conditions are met: you sell it less than 3 years after the gift, and less than 5 years after the donor bought it. For land, the second period is 8 years.

Speculation. Repeatedly buying, renovating and reselling can be treated as speculation. The gain is then taxed at 33%, or at progressive rates of up to 50% if it is a professional activity.

Companies. Property held by a company falls under corporate income tax, with no exemption period. This is a matter for your accountant.

What about the new 10% tax? Voted in April 2026, it targets gains on financial assets (shares, funds, crypto-assets). Property held directly is not listed among the assets concerned, according to Belfius (in French).

Brussels, Wallonia, Flanders: the same rules?

Yes, for the tax itself. The capital gains tax is part of federal income tax: rates and periods are the same in all three regions.

Three things do vary:

• Registration duties paid on purchase are regional. They count in the calculation if you deduct your actual costs rather than the 25% flat rate.
• Gift and inheritance taxes are regional, but they are a different tax from the capital gains tax.
• The municipal surcharge depends on the municipality where you live.

Calculating the gain step by step

The gain is not simply the sale price minus the purchase price. According to notaire.be, it works as follows:

1. Purchase price, plus the costs actually paid (registration duties, deed) or a 25% flat rate.
2. Plus 5% for each full year between purchase and sale.
3. Plus works invoiced by registered contractors.
4. Sale price, minus selling costs (agency commission, advertising).
5. Gain = net sale price minus the total of points 1 to 3.

Example 1: investment flat sold after 3 years. Bought for €300,000, sold for €360,000 with €9,000 of selling costs.

• Base: €300,000 + 25% = €375,000, then + 15% (3 years × 5%) = €431,250.
• Net sale price: €351,000.
• Result: no taxable gain.

Example 2: buy, renovate and sell after 1 year. Bought for €400,000, €100,000 of works by a contractor, sold for €720,000 with €20,000 of costs.

• Base: €400,000 + 25% = €500,000, + 5% = €525,000, + works = €625,000.
• Net sale price: €700,000.
• Gain: €75,000, i.e. €12,375 at 16.5%, before the municipal surcharge.

These examples are for illustration only. The tax authorities may use a value higher than the price if they consider it undervalued. For the other costs of a sale, see our seller’s fee guide for Brussels.

Tax return: who does what?

The gain is declared in your personal income tax return for the year following the sale. It is taxed at a separate rate, whatever your other income. If you are a non-resident, the notary withholds the tax when the deed is signed.

FAQ: property capital gains tax in Belgium

Conclusion: sell at the right time, at the right price

For most Brussels sellers, property capital gains tax in Belgium does not apply: main home, property held for more than 5 years, land held for more than 8 years, or inherited property. The cases to watch are quick resales of investment properties, land and recent gifts.

Either way, it all starts with the right asking price. Request a valuation of your property from GR Properties: we look at your property and your timing, working with your notary.

This article is for information only and does not replace advice from a notary or accountant.