Belgium Renewable Energy Tax Guide

Green Certificate Systems (Per Region)

• Flanders (Vlaanderen — VREG): Green certificates (groene stroomcertificaten) are issued for each MWh of renewable electricity produced (solar, wind, biomass, hydro, CHP). The guaranteed minimum price in Flanders is approximately €80–€100/MWh (depending on the technology and system size). Producers receive certificates for 10 years (solar) or 15 years (wind). The certificates are tradeable on the VREG market. Electricity suppliers must surrender a certain number of certificates per MWh sold (the "certificatenverplichting" / "obligation de certificats"). The system is funded by a surcharge on electricity bills (the "groene stroombijdrage" / "cotisation énergie verte").
• Wallonia (Wallonie — CWaPE): Green certificates are issued per MWh. The guaranteed price ranges from €65/MWh (solar large) to €150/MWh (wind offshore). The support period is 10–15 years depending on technology. Wallonia has stricter technology bands — certain technologies (large-scale solar) receive lower support. The utilities obligation system is similar to Flanders.
• Brussels-Capital (Bruxelles — Brugel): Green certificates are issued per MWh with a guaranteed minimum price of €80–€200/MWh depending on technology. The support period is 10 years. Brussels has limited renewable generation capacity due to urban density, but has strong support for building-integrated solar and CHP.

Energy Investment Deduction (Energie Investeringsaftrek)

• Federal deduction: The federal investment deduction for energy-saving investments (energiebesparende investeringen / investissements économiseurs d'énergie) allows companies to deduct 20% of the investment cost of qualifying energy-saving assets from their taxable profit. Qualifying assets: (a) high-efficiency boilers (condensing), (b) heat pumps (≥COP 3.5), (c) solar panels (PV and thermal), (d) LED lighting, (e) building insulation (roof, wall, floor), (f) energy management systems, (g) heat recovery systems, (h) electric vehicle charging stations (for business purposes). The deduction is available in addition to normal depreciation.
• Combination with green certificates: The investment deduction can be combined with regional green certificate support — the company receives both the tax deduction (reducing corporate tax) and the certificate revenue (taxable but partially sheltered). The investment deduction cannot exceed the taxable profit in the year (excess can be carried forward indefinitely).
• Accelerated depreciation for energy assets: Certain energy-efficient assets can be depreciated over a reduced period (linear depreciation over 3–5 years instead of the standard 10–20 years). This provides a timing advantage (faster tax relief). Assets eligible for accelerated depreciation: solar panels (3 years), wind turbines (5 years), CHP installations (5 years), heat pumps (5 years), energy storage systems (5 years).

CO2 Tax (CO2-Heffing / Taxe CO2)

• Industrial CO2 tax: Belgium introduced a federal CO2 tax on industrial energy use in 2025 (the "CO2-heffing" / "taxe CO2"). The tax is set at approximately €30/tonne CO2 (2026), increasing annually. It applies to: (a) large industrial emitters not covered by the EU ETS (Emissions Trading System), (b) commercial buildings with high energy consumption, (c) fuel oil and natural gas used for industrial heating. The tax is payable quarterly and is deductible for corporate tax purposes.
• Exemptions: The CO2 tax does NOT apply to: (a) facilities covered by the EU ETS (they pay for carbon allowances through the ETS system), (b) transport fuels (already covered by excise duties and the fuel tax component), (c) households (residential energy — the tax applies to commercial/industrial use), (d) renewable energy sources (solar, wind, biomass, hydro — they receive certificates instead).

Reduced VAT on Energy-Renovation

• 6% VAT on labour: The installation of solar panels, heat pumps, insulation, and high-efficiency glazing in private homes qualifies for the 6% VAT rate (reduced from 21%) on the labour component, provided: (a) the home is more than 10 years old, (b) the contractor is registered for VAT, (c) the work is for a private dwelling (not commercial). The 6% rate applies to labour only — materials are taxed at 21% unless they are supplied by the contractor as part of the total project (the "totaalprijs" / "prix total" — the contractor can apply 6% to the entire invoice for certain energy-saving works under the "woningen >10 jaar" / "habitations >10 ans" regime).
• In Flanders (Mijn VerbouwPremie): Premium of 25–40% of renovation costs, up to €10,000–€20,000. Combined with the Mijn VerbouwLening (0% loan up to €60,000).
• In Wallonia (Rénov'Ex): Premium of up to 30% of costs, maximum €15,000.
• In Brussels (Rénolution): Premium of 25–50% of costs, maximum €10,000–€30,000.

For related reading, see our Corporate Tax Guide →, Property Tax Guide →, and VAT/BTW Guide →.